Rusty Russell | f938d2c | 2007-07-26 10:41:02 -0700 | [diff] [blame] | 1 | /*P:100 This is the Launcher code, a simple program which lays out the |
Rusty Russell | a6bd8e1 | 2008-03-28 11:05:53 -0500 | [diff] [blame] | 2 | * "physical" memory for the new Guest by mapping the kernel image and |
| 3 | * the virtual devices, then opens /dev/lguest to tell the kernel |
| 4 | * about the Guest and control it. :*/ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 5 | #define _LARGEFILE64_SOURCE |
| 6 | #define _GNU_SOURCE |
| 7 | #include <stdio.h> |
| 8 | #include <string.h> |
| 9 | #include <unistd.h> |
| 10 | #include <err.h> |
| 11 | #include <stdint.h> |
| 12 | #include <stdlib.h> |
| 13 | #include <elf.h> |
| 14 | #include <sys/mman.h> |
Ronald G. Minnich | 6649bb7 | 2007-08-28 14:35:59 -0700 | [diff] [blame] | 15 | #include <sys/param.h> |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 16 | #include <sys/types.h> |
| 17 | #include <sys/stat.h> |
| 18 | #include <sys/wait.h> |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 19 | #include <sys/eventfd.h> |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 20 | #include <fcntl.h> |
| 21 | #include <stdbool.h> |
| 22 | #include <errno.h> |
| 23 | #include <ctype.h> |
| 24 | #include <sys/socket.h> |
| 25 | #include <sys/ioctl.h> |
| 26 | #include <sys/time.h> |
| 27 | #include <time.h> |
| 28 | #include <netinet/in.h> |
| 29 | #include <net/if.h> |
| 30 | #include <linux/sockios.h> |
| 31 | #include <linux/if_tun.h> |
| 32 | #include <sys/uio.h> |
| 33 | #include <termios.h> |
| 34 | #include <getopt.h> |
| 35 | #include <zlib.h> |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 36 | #include <assert.h> |
| 37 | #include <sched.h> |
Rusty Russell | a586d4f | 2008-02-04 23:49:56 -0500 | [diff] [blame] | 38 | #include <limits.h> |
| 39 | #include <stddef.h> |
Rusty Russell | a161883 | 2008-07-29 09:58:35 -0500 | [diff] [blame] | 40 | #include <signal.h> |
Rusty Russell | b45d8cb | 2007-10-22 10:56:24 +1000 | [diff] [blame] | 41 | #include "linux/lguest_launcher.h" |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 42 | #include "linux/virtio_config.h" |
| 43 | #include "linux/virtio_net.h" |
| 44 | #include "linux/virtio_blk.h" |
| 45 | #include "linux/virtio_console.h" |
Rusty Russell | 28fd6d7 | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 46 | #include "linux/virtio_rng.h" |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 47 | #include "linux/virtio_ring.h" |
Rusty Russell | d5d02d6 | 2008-10-31 11:24:25 -0500 | [diff] [blame] | 48 | #include "asm/bootparam.h" |
Rusty Russell | a6bd8e1 | 2008-03-28 11:05:53 -0500 | [diff] [blame] | 49 | /*L:110 We can ignore the 39 include files we need for this program, but I do |
Rusty Russell | db24e8c | 2007-10-25 14:09:25 +1000 | [diff] [blame] | 50 | * want to draw attention to the use of kernel-style types. |
| 51 | * |
| 52 | * As Linus said, "C is a Spartan language, and so should your naming be." I |
| 53 | * like these abbreviations, so we define them here. Note that u64 is always |
| 54 | * unsigned long long, which works on all Linux systems: this means that we can |
| 55 | * use %llu in printf for any u64. */ |
| 56 | typedef unsigned long long u64; |
| 57 | typedef uint32_t u32; |
| 58 | typedef uint16_t u16; |
| 59 | typedef uint8_t u8; |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 60 | /*:*/ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 61 | |
| 62 | #define PAGE_PRESENT 0x7 /* Present, RW, Execute */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 63 | #define BRIDGE_PFX "bridge:" |
| 64 | #ifndef SIOCBRADDIF |
| 65 | #define SIOCBRADDIF 0x89a2 /* add interface to bridge */ |
| 66 | #endif |
Rusty Russell | 3c6b5bf | 2007-10-22 11:03:26 +1000 | [diff] [blame] | 67 | /* We can have up to 256 pages for devices. */ |
| 68 | #define DEVICE_PAGES 256 |
Rusty Russell | 0f0c4fa | 2008-07-29 09:58:37 -0500 | [diff] [blame] | 69 | /* This will occupy 3 pages: it must be a power of 2. */ |
| 70 | #define VIRTQUEUE_NUM 256 |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 71 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 72 | /*L:120 verbose is both a global flag and a macro. The C preprocessor allows |
| 73 | * this, and although I wouldn't recommend it, it works quite nicely here. */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 74 | static bool verbose; |
| 75 | #define verbose(args...) \ |
| 76 | do { if (verbose) printf(args); } while(0) |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 77 | /*:*/ |
| 78 | |
Rusty Russell | 3c6b5bf | 2007-10-22 11:03:26 +1000 | [diff] [blame] | 79 | /* The pointer to the start of guest memory. */ |
| 80 | static void *guest_base; |
| 81 | /* The maximum guest physical address allowed, and maximum possible. */ |
| 82 | static unsigned long guest_limit, guest_max; |
Rusty Russell | 56739c80 | 2009-06-12 22:26:59 -0600 | [diff] [blame] | 83 | /* The /dev/lguest file descriptor. */ |
| 84 | static int lguest_fd; |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 85 | |
Glauber de Oliveira Costa | e3283fa | 2008-01-07 11:05:23 -0200 | [diff] [blame] | 86 | /* a per-cpu variable indicating whose vcpu is currently running */ |
| 87 | static unsigned int __thread cpu_id; |
| 88 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 89 | /* This is our list of devices. */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 90 | struct device_list |
| 91 | { |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 92 | /* Counter to assign interrupt numbers. */ |
| 93 | unsigned int next_irq; |
| 94 | |
| 95 | /* Counter to print out convenient device numbers. */ |
| 96 | unsigned int device_num; |
| 97 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 98 | /* The descriptor page for the devices. */ |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 99 | u8 *descpage; |
| 100 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 101 | /* A single linked list of devices. */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 102 | struct device *dev; |
Rusty Russell | a586d4f | 2008-02-04 23:49:56 -0500 | [diff] [blame] | 103 | /* And a pointer to the last device for easy append and also for |
| 104 | * configuration appending. */ |
| 105 | struct device *lastdev; |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 106 | }; |
| 107 | |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 108 | /* The list of Guest devices, based on command line arguments. */ |
| 109 | static struct device_list devices; |
| 110 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 111 | /* The device structure describes a single device. */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 112 | struct device |
| 113 | { |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 114 | /* The linked-list pointer. */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 115 | struct device *next; |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 116 | |
Rusty Russell | 713b15b | 2009-06-12 22:26:58 -0600 | [diff] [blame] | 117 | /* The device's descriptor, as mapped into the Guest. */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 118 | struct lguest_device_desc *desc; |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 119 | |
Rusty Russell | 713b15b | 2009-06-12 22:26:58 -0600 | [diff] [blame] | 120 | /* We can't trust desc values once Guest has booted: we use these. */ |
| 121 | unsigned int feature_len; |
| 122 | unsigned int num_vq; |
| 123 | |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 124 | /* The name of this device, for --verbose. */ |
| 125 | const char *name; |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 126 | |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 127 | /* Any queues attached to this device */ |
| 128 | struct virtqueue *vq; |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 129 | |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 130 | /* Is it operational */ |
| 131 | bool running; |
Rusty Russell | a007a75 | 2008-05-02 21:50:53 -0500 | [diff] [blame] | 132 | |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 133 | /* Device-specific data. */ |
| 134 | void *priv; |
| 135 | }; |
| 136 | |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 137 | /* The virtqueue structure describes a queue attached to a device. */ |
| 138 | struct virtqueue |
| 139 | { |
| 140 | struct virtqueue *next; |
| 141 | |
| 142 | /* Which device owns me. */ |
| 143 | struct device *dev; |
| 144 | |
| 145 | /* The configuration for this queue. */ |
| 146 | struct lguest_vqconfig config; |
| 147 | |
| 148 | /* The actual ring of buffers. */ |
| 149 | struct vring vring; |
| 150 | |
| 151 | /* Last available index we saw. */ |
| 152 | u16 last_avail_idx; |
| 153 | |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 154 | /* Eventfd where Guest notifications arrive. */ |
| 155 | int eventfd; |
Rusty Russell | 2088761 | 2008-05-30 15:09:46 -0500 | [diff] [blame] | 156 | |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 157 | /* Function for the thread which is servicing this virtqueue. */ |
| 158 | void (*service)(struct virtqueue *vq); |
| 159 | pid_t thread; |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 160 | }; |
| 161 | |
Balaji Rao | ec04b13 | 2007-12-28 14:26:24 +0530 | [diff] [blame] | 162 | /* Remember the arguments to the program so we can "reboot" */ |
| 163 | static char **main_args; |
| 164 | |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 165 | /* The original tty settings to restore on exit. */ |
| 166 | static struct termios orig_term; |
| 167 | |
Rusty Russell | f7027c6 | 2009-06-12 22:27:00 -0600 | [diff] [blame] | 168 | /* We have to be careful with barriers: our devices are all run in separate |
| 169 | * threads and so we need to make sure that changes visible to the Guest happen |
| 170 | * in precise order. */ |
| 171 | #define wmb() __asm__ __volatile__("" : : : "memory") |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 172 | |
| 173 | /* Convert an iovec element to the given type. |
| 174 | * |
| 175 | * This is a fairly ugly trick: we need to know the size of the type and |
| 176 | * alignment requirement to check the pointer is kosher. It's also nice to |
| 177 | * have the name of the type in case we report failure. |
| 178 | * |
| 179 | * Typing those three things all the time is cumbersome and error prone, so we |
| 180 | * have a macro which sets them all up and passes to the real function. */ |
| 181 | #define convert(iov, type) \ |
| 182 | ((type *)_convert((iov), sizeof(type), __alignof__(type), #type)) |
| 183 | |
| 184 | static void *_convert(struct iovec *iov, size_t size, size_t align, |
| 185 | const char *name) |
| 186 | { |
| 187 | if (iov->iov_len != size) |
| 188 | errx(1, "Bad iovec size %zu for %s", iov->iov_len, name); |
| 189 | if ((unsigned long)iov->iov_base % align != 0) |
| 190 | errx(1, "Bad alignment %p for %s", iov->iov_base, name); |
| 191 | return iov->iov_base; |
| 192 | } |
| 193 | |
Rusty Russell | b511179 | 2008-07-29 09:58:34 -0500 | [diff] [blame] | 194 | /* Wrapper for the last available index. Makes it easier to change. */ |
| 195 | #define lg_last_avail(vq) ((vq)->last_avail_idx) |
| 196 | |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 197 | /* The virtio configuration space is defined to be little-endian. x86 is |
| 198 | * little-endian too, but it's nice to be explicit so we have these helpers. */ |
| 199 | #define cpu_to_le16(v16) (v16) |
| 200 | #define cpu_to_le32(v32) (v32) |
| 201 | #define cpu_to_le64(v64) (v64) |
| 202 | #define le16_to_cpu(v16) (v16) |
| 203 | #define le32_to_cpu(v32) (v32) |
Rusty Russell | a586d4f | 2008-02-04 23:49:56 -0500 | [diff] [blame] | 204 | #define le64_to_cpu(v64) (v64) |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 205 | |
Rusty Russell | 28fd6d7 | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 206 | /* Is this iovec empty? */ |
| 207 | static bool iov_empty(const struct iovec iov[], unsigned int num_iov) |
| 208 | { |
| 209 | unsigned int i; |
| 210 | |
| 211 | for (i = 0; i < num_iov; i++) |
| 212 | if (iov[i].iov_len) |
| 213 | return false; |
| 214 | return true; |
| 215 | } |
| 216 | |
| 217 | /* Take len bytes from the front of this iovec. */ |
| 218 | static void iov_consume(struct iovec iov[], unsigned num_iov, unsigned len) |
| 219 | { |
| 220 | unsigned int i; |
| 221 | |
| 222 | for (i = 0; i < num_iov; i++) { |
| 223 | unsigned int used; |
| 224 | |
| 225 | used = iov[i].iov_len < len ? iov[i].iov_len : len; |
| 226 | iov[i].iov_base += used; |
| 227 | iov[i].iov_len -= used; |
| 228 | len -= used; |
| 229 | } |
| 230 | assert(len == 0); |
| 231 | } |
| 232 | |
Rusty Russell | 6e5aa7e | 2008-02-04 23:50:03 -0500 | [diff] [blame] | 233 | /* The device virtqueue descriptors are followed by feature bitmasks. */ |
| 234 | static u8 *get_feature_bits(struct device *dev) |
| 235 | { |
| 236 | return (u8 *)(dev->desc + 1) |
Rusty Russell | 713b15b | 2009-06-12 22:26:58 -0600 | [diff] [blame] | 237 | + dev->num_vq * sizeof(struct lguest_vqconfig); |
Rusty Russell | 6e5aa7e | 2008-02-04 23:50:03 -0500 | [diff] [blame] | 238 | } |
| 239 | |
Rusty Russell | 3c6b5bf | 2007-10-22 11:03:26 +1000 | [diff] [blame] | 240 | /*L:100 The Launcher code itself takes us out into userspace, that scary place |
| 241 | * where pointers run wild and free! Unfortunately, like most userspace |
| 242 | * programs, it's quite boring (which is why everyone likes to hack on the |
| 243 | * kernel!). Perhaps if you make up an Lguest Drinking Game at this point, it |
| 244 | * will get you through this section. Or, maybe not. |
| 245 | * |
| 246 | * The Launcher sets up a big chunk of memory to be the Guest's "physical" |
| 247 | * memory and stores it in "guest_base". In other words, Guest physical == |
| 248 | * Launcher virtual with an offset. |
| 249 | * |
| 250 | * This can be tough to get your head around, but usually it just means that we |
| 251 | * use these trivial conversion functions when the Guest gives us it's |
| 252 | * "physical" addresses: */ |
| 253 | static void *from_guest_phys(unsigned long addr) |
| 254 | { |
| 255 | return guest_base + addr; |
| 256 | } |
| 257 | |
| 258 | static unsigned long to_guest_phys(const void *addr) |
| 259 | { |
| 260 | return (addr - guest_base); |
| 261 | } |
| 262 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 263 | /*L:130 |
| 264 | * Loading the Kernel. |
| 265 | * |
| 266 | * We start with couple of simple helper routines. open_or_die() avoids |
| 267 | * error-checking code cluttering the callers: */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 268 | static int open_or_die(const char *name, int flags) |
| 269 | { |
| 270 | int fd = open(name, flags); |
| 271 | if (fd < 0) |
| 272 | err(1, "Failed to open %s", name); |
| 273 | return fd; |
| 274 | } |
| 275 | |
Rusty Russell | 3c6b5bf | 2007-10-22 11:03:26 +1000 | [diff] [blame] | 276 | /* map_zeroed_pages() takes a number of pages. */ |
| 277 | static void *map_zeroed_pages(unsigned int num) |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 278 | { |
Rusty Russell | 3c6b5bf | 2007-10-22 11:03:26 +1000 | [diff] [blame] | 279 | int fd = open_or_die("/dev/zero", O_RDONLY); |
| 280 | void *addr; |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 281 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 282 | /* We use a private mapping (ie. if we write to the page, it will be |
Rusty Russell | 3c6b5bf | 2007-10-22 11:03:26 +1000 | [diff] [blame] | 283 | * copied). */ |
| 284 | addr = mmap(NULL, getpagesize() * num, |
| 285 | PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, fd, 0); |
| 286 | if (addr == MAP_FAILED) |
| 287 | err(1, "Mmaping %u pages of /dev/zero", num); |
Mark McLoughlin | 34bdaab | 2008-06-13 14:04:58 +0100 | [diff] [blame] | 288 | close(fd); |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 289 | |
Rusty Russell | 3c6b5bf | 2007-10-22 11:03:26 +1000 | [diff] [blame] | 290 | return addr; |
| 291 | } |
| 292 | |
| 293 | /* Get some more pages for a device. */ |
| 294 | static void *get_pages(unsigned int num) |
| 295 | { |
| 296 | void *addr = from_guest_phys(guest_limit); |
| 297 | |
| 298 | guest_limit += num * getpagesize(); |
| 299 | if (guest_limit > guest_max) |
| 300 | errx(1, "Not enough memory for devices"); |
| 301 | return addr; |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 302 | } |
| 303 | |
Ronald G. Minnich | 6649bb7 | 2007-08-28 14:35:59 -0700 | [diff] [blame] | 304 | /* This routine is used to load the kernel or initrd. It tries mmap, but if |
| 305 | * that fails (Plan 9's kernel file isn't nicely aligned on page boundaries), |
| 306 | * it falls back to reading the memory in. */ |
| 307 | static void map_at(int fd, void *addr, unsigned long offset, unsigned long len) |
| 308 | { |
| 309 | ssize_t r; |
| 310 | |
| 311 | /* We map writable even though for some segments are marked read-only. |
| 312 | * The kernel really wants to be writable: it patches its own |
| 313 | * instructions. |
| 314 | * |
| 315 | * MAP_PRIVATE means that the page won't be copied until a write is |
| 316 | * done to it. This allows us to share untouched memory between |
| 317 | * Guests. */ |
| 318 | if (mmap(addr, len, PROT_READ|PROT_WRITE|PROT_EXEC, |
| 319 | MAP_FIXED|MAP_PRIVATE, fd, offset) != MAP_FAILED) |
| 320 | return; |
| 321 | |
| 322 | /* pread does a seek and a read in one shot: saves a few lines. */ |
| 323 | r = pread(fd, addr, len, offset); |
| 324 | if (r != len) |
| 325 | err(1, "Reading offset %lu len %lu gave %zi", offset, len, r); |
| 326 | } |
| 327 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 328 | /* This routine takes an open vmlinux image, which is in ELF, and maps it into |
| 329 | * the Guest memory. ELF = Embedded Linking Format, which is the format used |
| 330 | * by all modern binaries on Linux including the kernel. |
| 331 | * |
| 332 | * The ELF headers give *two* addresses: a physical address, and a virtual |
Rusty Russell | 47436aa | 2007-10-22 11:03:36 +1000 | [diff] [blame] | 333 | * address. We use the physical address; the Guest will map itself to the |
| 334 | * virtual address. |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 335 | * |
| 336 | * We return the starting address. */ |
Rusty Russell | 47436aa | 2007-10-22 11:03:36 +1000 | [diff] [blame] | 337 | static unsigned long map_elf(int elf_fd, const Elf32_Ehdr *ehdr) |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 338 | { |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 339 | Elf32_Phdr phdr[ehdr->e_phnum]; |
| 340 | unsigned int i; |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 341 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 342 | /* Sanity checks on the main ELF header: an x86 executable with a |
| 343 | * reasonable number of correctly-sized program headers. */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 344 | if (ehdr->e_type != ET_EXEC |
| 345 | || ehdr->e_machine != EM_386 |
| 346 | || ehdr->e_phentsize != sizeof(Elf32_Phdr) |
| 347 | || ehdr->e_phnum < 1 || ehdr->e_phnum > 65536U/sizeof(Elf32_Phdr)) |
| 348 | errx(1, "Malformed elf header"); |
| 349 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 350 | /* An ELF executable contains an ELF header and a number of "program" |
| 351 | * headers which indicate which parts ("segments") of the program to |
| 352 | * load where. */ |
| 353 | |
| 354 | /* We read in all the program headers at once: */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 355 | if (lseek(elf_fd, ehdr->e_phoff, SEEK_SET) < 0) |
| 356 | err(1, "Seeking to program headers"); |
| 357 | if (read(elf_fd, phdr, sizeof(phdr)) != sizeof(phdr)) |
| 358 | err(1, "Reading program headers"); |
| 359 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 360 | /* Try all the headers: there are usually only three. A read-only one, |
Rusty Russell | a6bd8e1 | 2008-03-28 11:05:53 -0500 | [diff] [blame] | 361 | * a read-write one, and a "note" section which we don't load. */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 362 | for (i = 0; i < ehdr->e_phnum; i++) { |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 363 | /* If this isn't a loadable segment, we ignore it */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 364 | if (phdr[i].p_type != PT_LOAD) |
| 365 | continue; |
| 366 | |
| 367 | verbose("Section %i: size %i addr %p\n", |
| 368 | i, phdr[i].p_memsz, (void *)phdr[i].p_paddr); |
| 369 | |
Ronald G. Minnich | 6649bb7 | 2007-08-28 14:35:59 -0700 | [diff] [blame] | 370 | /* We map this section of the file at its physical address. */ |
Rusty Russell | 3c6b5bf | 2007-10-22 11:03:26 +1000 | [diff] [blame] | 371 | map_at(elf_fd, from_guest_phys(phdr[i].p_paddr), |
Ronald G. Minnich | 6649bb7 | 2007-08-28 14:35:59 -0700 | [diff] [blame] | 372 | phdr[i].p_offset, phdr[i].p_filesz); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 373 | } |
| 374 | |
Rusty Russell | 814a0e5 | 2007-10-22 11:29:44 +1000 | [diff] [blame] | 375 | /* The entry point is given in the ELF header. */ |
| 376 | return ehdr->e_entry; |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 377 | } |
| 378 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 379 | /*L:150 A bzImage, unlike an ELF file, is not meant to be loaded. You're |
Rusty Russell | 5bbf89f | 2007-10-22 11:29:56 +1000 | [diff] [blame] | 380 | * supposed to jump into it and it will unpack itself. We used to have to |
| 381 | * perform some hairy magic because the unpacking code scared me. |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 382 | * |
Rusty Russell | 5bbf89f | 2007-10-22 11:29:56 +1000 | [diff] [blame] | 383 | * Fortunately, Jeremy Fitzhardinge convinced me it wasn't that hard and wrote |
| 384 | * a small patch to jump over the tricky bits in the Guest, so now we just read |
| 385 | * the funky header so we know where in the file to load, and away we go! */ |
Rusty Russell | 47436aa | 2007-10-22 11:03:36 +1000 | [diff] [blame] | 386 | static unsigned long load_bzimage(int fd) |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 387 | { |
Rusty Russell | 43d33b2 | 2007-10-22 11:29:57 +1000 | [diff] [blame] | 388 | struct boot_params boot; |
Rusty Russell | 5bbf89f | 2007-10-22 11:29:56 +1000 | [diff] [blame] | 389 | int r; |
| 390 | /* Modern bzImages get loaded at 1M. */ |
| 391 | void *p = from_guest_phys(0x100000); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 392 | |
Rusty Russell | 5bbf89f | 2007-10-22 11:29:56 +1000 | [diff] [blame] | 393 | /* Go back to the start of the file and read the header. It should be |
Uwe Hermann | 71cced6 | 2008-10-20 09:32:21 -0700 | [diff] [blame] | 394 | * a Linux boot header (see Documentation/x86/i386/boot.txt) */ |
Rusty Russell | 5bbf89f | 2007-10-22 11:29:56 +1000 | [diff] [blame] | 395 | lseek(fd, 0, SEEK_SET); |
Rusty Russell | 43d33b2 | 2007-10-22 11:29:57 +1000 | [diff] [blame] | 396 | read(fd, &boot, sizeof(boot)); |
Rusty Russell | 5bbf89f | 2007-10-22 11:29:56 +1000 | [diff] [blame] | 397 | |
Rusty Russell | 43d33b2 | 2007-10-22 11:29:57 +1000 | [diff] [blame] | 398 | /* Inside the setup_hdr, we expect the magic "HdrS" */ |
| 399 | if (memcmp(&boot.hdr.header, "HdrS", 4) != 0) |
Rusty Russell | 5bbf89f | 2007-10-22 11:29:56 +1000 | [diff] [blame] | 400 | errx(1, "This doesn't look like a bzImage to me"); |
| 401 | |
Rusty Russell | 43d33b2 | 2007-10-22 11:29:57 +1000 | [diff] [blame] | 402 | /* Skip over the extra sectors of the header. */ |
| 403 | lseek(fd, (boot.hdr.setup_sects+1) * 512, SEEK_SET); |
Rusty Russell | 5bbf89f | 2007-10-22 11:29:56 +1000 | [diff] [blame] | 404 | |
| 405 | /* Now read everything into memory. in nice big chunks. */ |
| 406 | while ((r = read(fd, p, 65536)) > 0) |
| 407 | p += r; |
| 408 | |
Rusty Russell | 43d33b2 | 2007-10-22 11:29:57 +1000 | [diff] [blame] | 409 | /* Finally, code32_start tells us where to enter the kernel. */ |
| 410 | return boot.hdr.code32_start; |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 411 | } |
| 412 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 413 | /*L:140 Loading the kernel is easy when it's a "vmlinux", but most kernels |
Rusty Russell | e1e7296 | 2007-10-25 15:02:50 +1000 | [diff] [blame] | 414 | * come wrapped up in the self-decompressing "bzImage" format. With a little |
| 415 | * work, we can load those, too. */ |
Rusty Russell | 47436aa | 2007-10-22 11:03:36 +1000 | [diff] [blame] | 416 | static unsigned long load_kernel(int fd) |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 417 | { |
| 418 | Elf32_Ehdr hdr; |
| 419 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 420 | /* Read in the first few bytes. */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 421 | if (read(fd, &hdr, sizeof(hdr)) != sizeof(hdr)) |
| 422 | err(1, "Reading kernel"); |
| 423 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 424 | /* If it's an ELF file, it starts with "\177ELF" */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 425 | if (memcmp(hdr.e_ident, ELFMAG, SELFMAG) == 0) |
Rusty Russell | 47436aa | 2007-10-22 11:03:36 +1000 | [diff] [blame] | 426 | return map_elf(fd, &hdr); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 427 | |
Rusty Russell | a6bd8e1 | 2008-03-28 11:05:53 -0500 | [diff] [blame] | 428 | /* Otherwise we assume it's a bzImage, and try to load it. */ |
Rusty Russell | 47436aa | 2007-10-22 11:03:36 +1000 | [diff] [blame] | 429 | return load_bzimage(fd); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 430 | } |
| 431 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 432 | /* This is a trivial little helper to align pages. Andi Kleen hated it because |
| 433 | * it calls getpagesize() twice: "it's dumb code." |
| 434 | * |
| 435 | * Kernel guys get really het up about optimization, even when it's not |
| 436 | * necessary. I leave this code as a reaction against that. */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 437 | static inline unsigned long page_align(unsigned long addr) |
| 438 | { |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 439 | /* Add upwards and truncate downwards. */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 440 | return ((addr + getpagesize()-1) & ~(getpagesize()-1)); |
| 441 | } |
| 442 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 443 | /*L:180 An "initial ram disk" is a disk image loaded into memory along with |
| 444 | * the kernel which the kernel can use to boot from without needing any |
| 445 | * drivers. Most distributions now use this as standard: the initrd contains |
| 446 | * the code to load the appropriate driver modules for the current machine. |
| 447 | * |
| 448 | * Importantly, James Morris works for RedHat, and Fedora uses initrds for its |
| 449 | * kernels. He sent me this (and tells me when I break it). */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 450 | static unsigned long load_initrd(const char *name, unsigned long mem) |
| 451 | { |
| 452 | int ifd; |
| 453 | struct stat st; |
| 454 | unsigned long len; |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 455 | |
| 456 | ifd = open_or_die(name, O_RDONLY); |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 457 | /* fstat() is needed to get the file size. */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 458 | if (fstat(ifd, &st) < 0) |
| 459 | err(1, "fstat() on initrd '%s'", name); |
| 460 | |
Ronald G. Minnich | 6649bb7 | 2007-08-28 14:35:59 -0700 | [diff] [blame] | 461 | /* We map the initrd at the top of memory, but mmap wants it to be |
| 462 | * page-aligned, so we round the size up for that. */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 463 | len = page_align(st.st_size); |
Rusty Russell | 3c6b5bf | 2007-10-22 11:03:26 +1000 | [diff] [blame] | 464 | map_at(ifd, from_guest_phys(mem - len), 0, st.st_size); |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 465 | /* Once a file is mapped, you can close the file descriptor. It's a |
| 466 | * little odd, but quite useful. */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 467 | close(ifd); |
Ronald G. Minnich | 6649bb7 | 2007-08-28 14:35:59 -0700 | [diff] [blame] | 468 | verbose("mapped initrd %s size=%lu @ %p\n", name, len, (void*)mem-len); |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 469 | |
| 470 | /* We return the initrd size. */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 471 | return len; |
| 472 | } |
Rusty Russell | e1e7296 | 2007-10-25 15:02:50 +1000 | [diff] [blame] | 473 | /*:*/ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 474 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 475 | /* Simple routine to roll all the commandline arguments together with spaces |
| 476 | * between them. */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 477 | static void concat(char *dst, char *args[]) |
| 478 | { |
| 479 | unsigned int i, len = 0; |
| 480 | |
| 481 | for (i = 0; args[i]; i++) { |
Paul Bolle | 1ef36fa | 2008-03-10 16:39:03 +0100 | [diff] [blame] | 482 | if (i) { |
| 483 | strcat(dst+len, " "); |
| 484 | len++; |
| 485 | } |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 486 | strcpy(dst+len, args[i]); |
Paul Bolle | 1ef36fa | 2008-03-10 16:39:03 +0100 | [diff] [blame] | 487 | len += strlen(args[i]); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 488 | } |
| 489 | /* In case it's empty. */ |
| 490 | dst[len] = '\0'; |
| 491 | } |
| 492 | |
Rusty Russell | e1e7296 | 2007-10-25 15:02:50 +1000 | [diff] [blame] | 493 | /*L:185 This is where we actually tell the kernel to initialize the Guest. We |
| 494 | * saw the arguments it expects when we looked at initialize() in lguest_user.c: |
Matias Zabaljauregui | 58a2456 | 2008-09-29 01:40:07 -0300 | [diff] [blame] | 495 | * the base of Guest "physical" memory, the top physical page to allow and the |
| 496 | * entry point for the Guest. */ |
Rusty Russell | 56739c80 | 2009-06-12 22:26:59 -0600 | [diff] [blame] | 497 | static void tell_kernel(unsigned long start) |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 498 | { |
Jes Sorensen | 511801d | 2007-10-22 11:03:31 +1000 | [diff] [blame] | 499 | unsigned long args[] = { LHREQ_INITIALIZE, |
| 500 | (unsigned long)guest_base, |
Matias Zabaljauregui | 58a2456 | 2008-09-29 01:40:07 -0300 | [diff] [blame] | 501 | guest_limit / getpagesize(), start }; |
Rusty Russell | 3c6b5bf | 2007-10-22 11:03:26 +1000 | [diff] [blame] | 502 | verbose("Guest: %p - %p (%#lx)\n", |
| 503 | guest_base, guest_base + guest_limit, guest_limit); |
Rusty Russell | 56739c80 | 2009-06-12 22:26:59 -0600 | [diff] [blame] | 504 | lguest_fd = open_or_die("/dev/lguest", O_RDWR); |
| 505 | if (write(lguest_fd, args, sizeof(args)) < 0) |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 506 | err(1, "Writing to /dev/lguest"); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 507 | } |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 508 | /*:*/ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 509 | |
Rusty Russell | e1e7296 | 2007-10-25 15:02:50 +1000 | [diff] [blame] | 510 | /* |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 511 | * Device Handling. |
| 512 | * |
Rusty Russell | e1e7296 | 2007-10-25 15:02:50 +1000 | [diff] [blame] | 513 | * When the Guest gives us a buffer, it sends an array of addresses and sizes. |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 514 | * We need to make sure it's not trying to reach into the Launcher itself, so |
Rusty Russell | e1e7296 | 2007-10-25 15:02:50 +1000 | [diff] [blame] | 515 | * we have a convenient routine which checks it and exits with an error message |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 516 | * if something funny is going on: |
| 517 | */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 518 | static void *_check_pointer(unsigned long addr, unsigned int size, |
| 519 | unsigned int line) |
| 520 | { |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 521 | /* We have to separately check addr and addr+size, because size could |
| 522 | * be huge and addr + size might wrap around. */ |
Rusty Russell | 3c6b5bf | 2007-10-22 11:03:26 +1000 | [diff] [blame] | 523 | if (addr >= guest_limit || addr + size >= guest_limit) |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 524 | errx(1, "%s:%i: Invalid address %#lx", __FILE__, line, addr); |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 525 | /* We return a pointer for the caller's convenience, now we know it's |
| 526 | * safe to use. */ |
Rusty Russell | 3c6b5bf | 2007-10-22 11:03:26 +1000 | [diff] [blame] | 527 | return from_guest_phys(addr); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 528 | } |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 529 | /* A macro which transparently hands the line number to the real function. */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 530 | #define check_pointer(addr,size) _check_pointer(addr, size, __LINE__) |
| 531 | |
Rusty Russell | e1e7296 | 2007-10-25 15:02:50 +1000 | [diff] [blame] | 532 | /* Each buffer in the virtqueues is actually a chain of descriptors. This |
| 533 | * function returns the next descriptor in the chain, or vq->vring.num if we're |
| 534 | * at the end. */ |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 535 | static unsigned next_desc(struct virtqueue *vq, unsigned int i) |
| 536 | { |
| 537 | unsigned int next; |
| 538 | |
| 539 | /* If this descriptor says it doesn't chain, we're done. */ |
| 540 | if (!(vq->vring.desc[i].flags & VRING_DESC_F_NEXT)) |
| 541 | return vq->vring.num; |
| 542 | |
| 543 | /* Check they're not leading us off end of descriptors. */ |
| 544 | next = vq->vring.desc[i].next; |
| 545 | /* Make sure compiler knows to grab that: we don't want it changing! */ |
| 546 | wmb(); |
| 547 | |
| 548 | if (next >= vq->vring.num) |
| 549 | errx(1, "Desc next is %u", next); |
| 550 | |
| 551 | return next; |
| 552 | } |
| 553 | |
| 554 | /* This looks in the virtqueue and for the first available buffer, and converts |
| 555 | * it to an iovec for convenient access. Since descriptors consist of some |
| 556 | * number of output then some number of input descriptors, it's actually two |
| 557 | * iovecs, but we pack them into one and note how many of each there were. |
| 558 | * |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 559 | * This function returns the descriptor number found. */ |
| 560 | static unsigned wait_for_vq_desc(struct virtqueue *vq, |
| 561 | struct iovec iov[], |
| 562 | unsigned int *out_num, unsigned int *in_num) |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 563 | { |
| 564 | unsigned int i, head; |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 565 | u16 last_avail = lg_last_avail(vq); |
| 566 | |
| 567 | while (last_avail == vq->vring.avail->idx) { |
| 568 | u64 event; |
| 569 | |
| 570 | /* Nothing new? Wait for eventfd to tell us they refilled. */ |
| 571 | if (read(vq->eventfd, &event, sizeof(event)) != sizeof(event)) |
| 572 | errx(1, "Event read failed?"); |
| 573 | } |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 574 | |
| 575 | /* Check it isn't doing very strange things with descriptor numbers. */ |
Rusty Russell | b511179 | 2008-07-29 09:58:34 -0500 | [diff] [blame] | 576 | if ((u16)(vq->vring.avail->idx - last_avail) > vq->vring.num) |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 577 | errx(1, "Guest moved used index from %u to %u", |
Rusty Russell | b511179 | 2008-07-29 09:58:34 -0500 | [diff] [blame] | 578 | last_avail, vq->vring.avail->idx); |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 579 | |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 580 | /* Grab the next descriptor number they're advertising, and increment |
| 581 | * the index we've seen. */ |
Rusty Russell | b511179 | 2008-07-29 09:58:34 -0500 | [diff] [blame] | 582 | head = vq->vring.avail->ring[last_avail % vq->vring.num]; |
| 583 | lg_last_avail(vq)++; |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 584 | |
| 585 | /* If their number is silly, that's a fatal mistake. */ |
| 586 | if (head >= vq->vring.num) |
| 587 | errx(1, "Guest says index %u is available", head); |
| 588 | |
| 589 | /* When we start there are none of either input nor output. */ |
| 590 | *out_num = *in_num = 0; |
| 591 | |
| 592 | i = head; |
| 593 | do { |
| 594 | /* Grab the first descriptor, and check it's OK. */ |
| 595 | iov[*out_num + *in_num].iov_len = vq->vring.desc[i].len; |
| 596 | iov[*out_num + *in_num].iov_base |
| 597 | = check_pointer(vq->vring.desc[i].addr, |
| 598 | vq->vring.desc[i].len); |
| 599 | /* If this is an input descriptor, increment that count. */ |
| 600 | if (vq->vring.desc[i].flags & VRING_DESC_F_WRITE) |
| 601 | (*in_num)++; |
| 602 | else { |
| 603 | /* If it's an output descriptor, they're all supposed |
| 604 | * to come before any input descriptors. */ |
| 605 | if (*in_num) |
| 606 | errx(1, "Descriptor has out after in"); |
| 607 | (*out_num)++; |
| 608 | } |
| 609 | |
| 610 | /* If we've got too many, that implies a descriptor loop. */ |
| 611 | if (*out_num + *in_num > vq->vring.num) |
| 612 | errx(1, "Looped descriptor"); |
| 613 | } while ((i = next_desc(vq, i)) != vq->vring.num); |
| 614 | |
| 615 | return head; |
| 616 | } |
| 617 | |
Rusty Russell | e1e7296 | 2007-10-25 15:02:50 +1000 | [diff] [blame] | 618 | /* After we've used one of their buffers, we tell them about it. We'll then |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 619 | * want to send them an interrupt, using trigger_irq(). */ |
| 620 | static void add_used(struct virtqueue *vq, unsigned int head, int len) |
| 621 | { |
| 622 | struct vring_used_elem *used; |
| 623 | |
Rusty Russell | e1e7296 | 2007-10-25 15:02:50 +1000 | [diff] [blame] | 624 | /* The virtqueue contains a ring of used buffers. Get a pointer to the |
| 625 | * next entry in that used ring. */ |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 626 | used = &vq->vring.used->ring[vq->vring.used->idx % vq->vring.num]; |
| 627 | used->id = head; |
| 628 | used->len = len; |
| 629 | /* Make sure buffer is written before we update index. */ |
| 630 | wmb(); |
| 631 | vq->vring.used->idx++; |
| 632 | } |
| 633 | |
| 634 | /* This actually sends the interrupt for this virtqueue */ |
Rusty Russell | 56739c80 | 2009-06-12 22:26:59 -0600 | [diff] [blame] | 635 | static void trigger_irq(struct virtqueue *vq) |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 636 | { |
| 637 | unsigned long buf[] = { LHREQ_IRQ, vq->config.irq }; |
| 638 | |
Rusty Russell | 2088761 | 2008-05-30 15:09:46 -0500 | [diff] [blame] | 639 | /* If they don't want an interrupt, don't send one, unless empty. */ |
| 640 | if ((vq->vring.avail->flags & VRING_AVAIL_F_NO_INTERRUPT) |
Rusty Russell | ebf9a5a | 2009-06-12 22:27:01 -0600 | [diff] [blame] | 641 | && lg_last_avail(vq) != vq->vring.avail->idx) |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 642 | return; |
| 643 | |
| 644 | /* Send the Guest an interrupt tell them we used something up. */ |
Rusty Russell | 56739c80 | 2009-06-12 22:26:59 -0600 | [diff] [blame] | 645 | if (write(lguest_fd, buf, sizeof(buf)) != 0) |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 646 | err(1, "Triggering irq %i", vq->config.irq); |
| 647 | } |
| 648 | |
| 649 | /* And here's the combo meal deal. Supersize me! */ |
Rusty Russell | 56739c80 | 2009-06-12 22:26:59 -0600 | [diff] [blame] | 650 | static void add_used_and_trigger(struct virtqueue *vq, unsigned head, int len) |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 651 | { |
| 652 | add_used(vq, head, len); |
Rusty Russell | 56739c80 | 2009-06-12 22:26:59 -0600 | [diff] [blame] | 653 | trigger_irq(vq); |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 654 | } |
| 655 | |
Rusty Russell | e1e7296 | 2007-10-25 15:02:50 +1000 | [diff] [blame] | 656 | /* |
| 657 | * The Console |
| 658 | * |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 659 | * We associate some data with the console for our exit hack. */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 660 | struct console_abort |
| 661 | { |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 662 | /* How many times have they hit ^C? */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 663 | int count; |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 664 | /* When did they start? */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 665 | struct timeval start; |
| 666 | }; |
| 667 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 668 | /* This is the routine which handles console input (ie. stdin). */ |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 669 | static void console_input(struct virtqueue *vq) |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 670 | { |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 671 | int len; |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 672 | unsigned int head, in_num, out_num; |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 673 | struct console_abort *abort = vq->dev->priv; |
| 674 | struct iovec iov[vq->vring.num]; |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 675 | |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 676 | /* Make sure there's a descriptor waiting. */ |
| 677 | head = wait_for_vq_desc(vq, iov, &out_num, &in_num); |
Rusty Russell | 56ae43d | 2007-10-22 11:24:23 +1000 | [diff] [blame] | 678 | if (out_num) |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 679 | errx(1, "Output buffers in console in queue?"); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 680 | |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 681 | /* Read it in. */ |
| 682 | len = readv(STDIN_FILENO, iov, in_num); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 683 | if (len <= 0) { |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 684 | /* Ran out of input? */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 685 | warnx("Failed to get console input, ignoring console."); |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 686 | /* For simplicity, dying threads kill the whole Launcher. So |
| 687 | * just nap here. */ |
| 688 | for (;;) |
| 689 | pause(); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 690 | } |
| 691 | |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 692 | add_used_and_trigger(vq, head, len); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 693 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 694 | /* Three ^C within one second? Exit. |
| 695 | * |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 696 | * This is such a hack, but works surprisingly well. Each ^C has to |
| 697 | * be in a buffer by itself, so they can't be too fast. But we check |
| 698 | * that we get three within about a second, so they can't be too |
| 699 | * slow. */ |
| 700 | if (len != 1 || ((char *)iov[0].iov_base)[0] != 3) { |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 701 | abort->count = 0; |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 702 | return; |
| 703 | } |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 704 | |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 705 | abort->count++; |
| 706 | if (abort->count == 1) |
| 707 | gettimeofday(&abort->start, NULL); |
| 708 | else if (abort->count == 3) { |
| 709 | struct timeval now; |
| 710 | gettimeofday(&now, NULL); |
| 711 | /* Kill all Launcher processes with SIGINT, like normal ^C */ |
| 712 | if (now.tv_sec <= abort->start.tv_sec+1) |
| 713 | kill(0, SIGINT); |
| 714 | abort->count = 0; |
| 715 | } |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 716 | } |
| 717 | |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 718 | /* This is the routine which handles console output (ie. stdout). */ |
| 719 | static void console_output(struct virtqueue *vq) |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 720 | { |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 721 | unsigned int head, out, in; |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 722 | struct iovec iov[vq->vring.num]; |
| 723 | |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 724 | head = wait_for_vq_desc(vq, iov, &out, &in); |
| 725 | if (in) |
| 726 | errx(1, "Input buffers in console output queue?"); |
| 727 | while (!iov_empty(iov, out)) { |
| 728 | int len = writev(STDOUT_FILENO, iov, out); |
| 729 | if (len <= 0) |
| 730 | err(1, "Write to stdout gave %i", len); |
| 731 | iov_consume(iov, out, len); |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 732 | } |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 733 | add_used_and_trigger(vq, head, 0); |
Rusty Russell | a161883 | 2008-07-29 09:58:35 -0500 | [diff] [blame] | 734 | } |
| 735 | |
Rusty Russell | e1e7296 | 2007-10-25 15:02:50 +1000 | [diff] [blame] | 736 | /* |
| 737 | * The Network |
| 738 | * |
| 739 | * Handling output for network is also simple: we get all the output buffers |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 740 | * and write them to /dev/net/tun. |
Rusty Russell | a6bd8e1 | 2008-03-28 11:05:53 -0500 | [diff] [blame] | 741 | */ |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 742 | struct net_info { |
| 743 | int tunfd; |
| 744 | }; |
| 745 | |
| 746 | static void net_output(struct virtqueue *vq) |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 747 | { |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 748 | struct net_info *net_info = vq->dev->priv; |
| 749 | unsigned int head, out, in; |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 750 | struct iovec iov[vq->vring.num]; |
| 751 | |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 752 | head = wait_for_vq_desc(vq, iov, &out, &in); |
| 753 | if (in) |
| 754 | errx(1, "Input buffers in net output queue?"); |
| 755 | if (writev(net_info->tunfd, iov, out) < 0) |
| 756 | errx(1, "Write to tun failed?"); |
| 757 | add_used_and_trigger(vq, head, 0); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 758 | } |
| 759 | |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 760 | /* This is where we handle packets coming in from the tun device to our |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 761 | * Guest. */ |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 762 | static void net_input(struct virtqueue *vq) |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 763 | { |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 764 | int len; |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 765 | unsigned int head, out, in; |
| 766 | struct iovec iov[vq->vring.num]; |
| 767 | struct net_info *net_info = vq->dev->priv; |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 768 | |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 769 | head = wait_for_vq_desc(vq, iov, &out, &in); |
| 770 | if (out) |
| 771 | errx(1, "Output buffers in net input queue?"); |
| 772 | len = readv(net_info->tunfd, iov, in); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 773 | if (len <= 0) |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 774 | err(1, "Failed to read from tun."); |
| 775 | add_used_and_trigger(vq, head, len); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 776 | } |
| 777 | |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 778 | /* This is the helper to create threads. */ |
| 779 | static int do_thread(void *_vq) |
Rusty Russell | 56ae43d | 2007-10-22 11:24:23 +1000 | [diff] [blame] | 780 | { |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 781 | struct virtqueue *vq = _vq; |
| 782 | |
| 783 | for (;;) |
| 784 | vq->service(vq); |
| 785 | return 0; |
Rusty Russell | 56ae43d | 2007-10-22 11:24:23 +1000 | [diff] [blame] | 786 | } |
| 787 | |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 788 | /* When a child dies, we kill our entire process group with SIGTERM. This |
| 789 | * also has the side effect that the shell restores the console for us! */ |
| 790 | static void kill_launcher(int signal) |
Rusty Russell | 5dae785 | 2008-07-29 09:58:35 -0500 | [diff] [blame] | 791 | { |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 792 | kill(0, SIGTERM); |
| 793 | } |
| 794 | |
| 795 | static void reset_device(struct device *dev) |
| 796 | { |
| 797 | struct virtqueue *vq; |
| 798 | |
| 799 | verbose("Resetting device %s\n", dev->name); |
| 800 | |
| 801 | /* Clear any features they've acked. */ |
| 802 | memset(get_feature_bits(dev) + dev->feature_len, 0, dev->feature_len); |
| 803 | |
| 804 | /* We're going to be explicitly killing threads, so ignore them. */ |
| 805 | signal(SIGCHLD, SIG_IGN); |
| 806 | |
| 807 | /* Zero out the virtqueues, get rid of their threads */ |
| 808 | for (vq = dev->vq; vq; vq = vq->next) { |
| 809 | if (vq->thread != (pid_t)-1) { |
| 810 | kill(vq->thread, SIGTERM); |
| 811 | waitpid(vq->thread, NULL, 0); |
| 812 | vq->thread = (pid_t)-1; |
| 813 | } |
| 814 | memset(vq->vring.desc, 0, |
| 815 | vring_size(vq->config.num, LGUEST_VRING_ALIGN)); |
| 816 | lg_last_avail(vq) = 0; |
| 817 | } |
| 818 | dev->running = false; |
| 819 | |
| 820 | /* Now we care if threads die. */ |
| 821 | signal(SIGCHLD, (void *)kill_launcher); |
| 822 | } |
| 823 | |
| 824 | static void create_thread(struct virtqueue *vq) |
| 825 | { |
| 826 | /* Create stack for thread and run it. Since stack grows |
| 827 | * upwards, we point the stack pointer to the end of this |
| 828 | * region. */ |
| 829 | char *stack = malloc(32768); |
| 830 | unsigned long args[] = { LHREQ_EVENTFD, |
| 831 | vq->config.pfn*getpagesize(), 0 }; |
| 832 | |
| 833 | /* Create a zero-initialized eventfd. */ |
| 834 | vq->eventfd = eventfd(0, 0); |
| 835 | if (vq->eventfd < 0) |
| 836 | err(1, "Creating eventfd"); |
| 837 | args[2] = vq->eventfd; |
| 838 | |
| 839 | /* Attach an eventfd to this virtqueue: it will go off |
| 840 | * when the Guest does an LHCALL_NOTIFY for this vq. */ |
| 841 | if (write(lguest_fd, &args, sizeof(args)) != 0) |
| 842 | err(1, "Attaching eventfd"); |
| 843 | |
| 844 | /* CLONE_VM: because it has to access the Guest memory, and |
| 845 | * SIGCHLD so we get a signal if it dies. */ |
| 846 | vq->thread = clone(do_thread, stack + 32768, CLONE_VM | SIGCHLD, vq); |
| 847 | if (vq->thread == (pid_t)-1) |
| 848 | err(1, "Creating clone"); |
| 849 | /* We close our local copy, now the child has it. */ |
| 850 | close(vq->eventfd); |
| 851 | } |
| 852 | |
| 853 | static void start_device(struct device *dev) |
| 854 | { |
| 855 | unsigned int i; |
| 856 | struct virtqueue *vq; |
| 857 | |
| 858 | verbose("Device %s OK: offered", dev->name); |
| 859 | for (i = 0; i < dev->feature_len; i++) |
| 860 | verbose(" %02x", get_feature_bits(dev)[i]); |
| 861 | verbose(", accepted"); |
| 862 | for (i = 0; i < dev->feature_len; i++) |
| 863 | verbose(" %02x", get_feature_bits(dev) |
| 864 | [dev->feature_len+i]); |
| 865 | |
| 866 | for (vq = dev->vq; vq; vq = vq->next) { |
| 867 | if (vq->service) |
| 868 | create_thread(vq); |
| 869 | } |
| 870 | dev->running = true; |
| 871 | } |
| 872 | |
| 873 | static void cleanup_devices(void) |
| 874 | { |
| 875 | struct device *dev; |
| 876 | |
| 877 | for (dev = devices.dev; dev; dev = dev->next) |
| 878 | reset_device(dev); |
| 879 | |
| 880 | /* If we saved off the original terminal settings, restore them now. */ |
| 881 | if (orig_term.c_lflag & (ISIG|ICANON|ECHO)) |
| 882 | tcsetattr(STDIN_FILENO, TCSANOW, &orig_term); |
Rusty Russell | 5dae785 | 2008-07-29 09:58:35 -0500 | [diff] [blame] | 883 | } |
| 884 | |
Rusty Russell | a007a75 | 2008-05-02 21:50:53 -0500 | [diff] [blame] | 885 | /* When the Guest tells us they updated the status field, we handle it. */ |
| 886 | static void update_device_status(struct device *dev) |
Rusty Russell | 6e5aa7e | 2008-02-04 23:50:03 -0500 | [diff] [blame] | 887 | { |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 888 | /* A zero status is a reset, otherwise it's a set of flags. */ |
| 889 | if (dev->desc->status == 0) |
| 890 | reset_device(dev); |
| 891 | else if (dev->desc->status & VIRTIO_CONFIG_S_FAILED) { |
Rusty Russell | a007a75 | 2008-05-02 21:50:53 -0500 | [diff] [blame] | 892 | warnx("Device %s configuration FAILED", dev->name); |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 893 | if (dev->running) |
| 894 | reset_device(dev); |
Rusty Russell | a007a75 | 2008-05-02 21:50:53 -0500 | [diff] [blame] | 895 | } else if (dev->desc->status & VIRTIO_CONFIG_S_DRIVER_OK) { |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 896 | if (!dev->running) |
| 897 | start_device(dev); |
Rusty Russell | 6e5aa7e | 2008-02-04 23:50:03 -0500 | [diff] [blame] | 898 | } |
| 899 | } |
| 900 | |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 901 | /* This is the generic routine we call when the Guest uses LHCALL_NOTIFY. */ |
Rusty Russell | 56739c80 | 2009-06-12 22:26:59 -0600 | [diff] [blame] | 902 | static void handle_output(unsigned long addr) |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 903 | { |
| 904 | struct device *i; |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 905 | |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 906 | /* Check each device. */ |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 907 | for (i = devices.dev; i; i = i->next) { |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 908 | struct virtqueue *vq; |
| 909 | |
Rusty Russell | a007a75 | 2008-05-02 21:50:53 -0500 | [diff] [blame] | 910 | /* Notifications to device descriptors update device status. */ |
Rusty Russell | 6e5aa7e | 2008-02-04 23:50:03 -0500 | [diff] [blame] | 911 | if (from_guest_phys(addr) == i->desc) { |
Rusty Russell | a007a75 | 2008-05-02 21:50:53 -0500 | [diff] [blame] | 912 | update_device_status(i); |
Rusty Russell | 6e5aa7e | 2008-02-04 23:50:03 -0500 | [diff] [blame] | 913 | return; |
| 914 | } |
| 915 | |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 916 | /* Devices *can* be used before status is set to DRIVER_OK. */ |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 917 | for (vq = i->vq; vq; vq = vq->next) { |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 918 | if (addr != vq->config.pfn*getpagesize()) |
Rusty Russell | 6e5aa7e | 2008-02-04 23:50:03 -0500 | [diff] [blame] | 919 | continue; |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 920 | if (i->running) |
| 921 | errx(1, "Notification on running %s", i->name); |
| 922 | start_device(i); |
Rusty Russell | 6e5aa7e | 2008-02-04 23:50:03 -0500 | [diff] [blame] | 923 | return; |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 924 | } |
| 925 | } |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 926 | |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 927 | /* Early console write is done using notify on a nul-terminated string |
| 928 | * in Guest memory. */ |
| 929 | if (addr >= guest_limit) |
| 930 | errx(1, "Bad NOTIFY %#lx", addr); |
| 931 | |
| 932 | write(STDOUT_FILENO, from_guest_phys(addr), |
| 933 | strnlen(from_guest_phys(addr), guest_limit - addr)); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 934 | } |
| 935 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 936 | /*L:190 |
| 937 | * Device Setup |
| 938 | * |
| 939 | * All devices need a descriptor so the Guest knows it exists, and a "struct |
| 940 | * device" so the Launcher can keep track of it. We have common helper |
Rusty Russell | a6bd8e1 | 2008-03-28 11:05:53 -0500 | [diff] [blame] | 941 | * routines to allocate and manage them. |
| 942 | */ |
Rusty Russell | a586d4f | 2008-02-04 23:49:56 -0500 | [diff] [blame] | 943 | |
| 944 | /* The layout of the device page is a "struct lguest_device_desc" followed by a |
| 945 | * number of virtqueue descriptors, then two sets of feature bits, then an |
| 946 | * array of configuration bytes. This routine returns the configuration |
| 947 | * pointer. */ |
| 948 | static u8 *device_config(const struct device *dev) |
| 949 | { |
| 950 | return (void *)(dev->desc + 1) |
Rusty Russell | 713b15b | 2009-06-12 22:26:58 -0600 | [diff] [blame] | 951 | + dev->num_vq * sizeof(struct lguest_vqconfig) |
| 952 | + dev->feature_len * 2; |
Rusty Russell | a586d4f | 2008-02-04 23:49:56 -0500 | [diff] [blame] | 953 | } |
| 954 | |
| 955 | /* This routine allocates a new "struct lguest_device_desc" from descriptor |
| 956 | * table page just above the Guest's normal memory. It returns a pointer to |
| 957 | * that descriptor. */ |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 958 | static struct lguest_device_desc *new_dev_desc(u16 type) |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 959 | { |
Rusty Russell | a586d4f | 2008-02-04 23:49:56 -0500 | [diff] [blame] | 960 | struct lguest_device_desc d = { .type = type }; |
| 961 | void *p; |
| 962 | |
| 963 | /* Figure out where the next device config is, based on the last one. */ |
| 964 | if (devices.lastdev) |
| 965 | p = device_config(devices.lastdev) |
| 966 | + devices.lastdev->desc->config_len; |
| 967 | else |
| 968 | p = devices.descpage; |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 969 | |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 970 | /* We only have one page for all the descriptors. */ |
Rusty Russell | a586d4f | 2008-02-04 23:49:56 -0500 | [diff] [blame] | 971 | if (p + sizeof(d) > (void *)devices.descpage + getpagesize()) |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 972 | errx(1, "Too many devices"); |
| 973 | |
Rusty Russell | a586d4f | 2008-02-04 23:49:56 -0500 | [diff] [blame] | 974 | /* p might not be aligned, so we memcpy in. */ |
| 975 | return memcpy(p, &d, sizeof(d)); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 976 | } |
| 977 | |
Rusty Russell | a586d4f | 2008-02-04 23:49:56 -0500 | [diff] [blame] | 978 | /* Each device descriptor is followed by the description of its virtqueues. We |
| 979 | * specify how many descriptors the virtqueue is to have. */ |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 980 | static void add_virtqueue(struct device *dev, unsigned int num_descs, |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 981 | void (*service)(struct virtqueue *)) |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 982 | { |
| 983 | unsigned int pages; |
| 984 | struct virtqueue **i, *vq = malloc(sizeof(*vq)); |
| 985 | void *p; |
| 986 | |
Rusty Russell | a6bd8e1 | 2008-03-28 11:05:53 -0500 | [diff] [blame] | 987 | /* First we need some memory for this virtqueue. */ |
Rusty Russell | 2966af7 | 2008-12-30 09:25:58 -0600 | [diff] [blame] | 988 | pages = (vring_size(num_descs, LGUEST_VRING_ALIGN) + getpagesize() - 1) |
Rusty Russell | 42b36cc | 2007-11-12 13:39:18 +1100 | [diff] [blame] | 989 | / getpagesize(); |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 990 | p = get_pages(pages); |
| 991 | |
Rusty Russell | d1c856e | 2007-11-19 11:20:40 -0500 | [diff] [blame] | 992 | /* Initialize the virtqueue */ |
| 993 | vq->next = NULL; |
| 994 | vq->last_avail_idx = 0; |
| 995 | vq->dev = dev; |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 996 | vq->service = service; |
| 997 | vq->thread = (pid_t)-1; |
Rusty Russell | d1c856e | 2007-11-19 11:20:40 -0500 | [diff] [blame] | 998 | |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 999 | /* Initialize the configuration. */ |
| 1000 | vq->config.num = num_descs; |
| 1001 | vq->config.irq = devices.next_irq++; |
| 1002 | vq->config.pfn = to_guest_phys(p) / getpagesize(); |
| 1003 | |
| 1004 | /* Initialize the vring. */ |
Rusty Russell | 2966af7 | 2008-12-30 09:25:58 -0600 | [diff] [blame] | 1005 | vring_init(&vq->vring, num_descs, p, LGUEST_VRING_ALIGN); |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1006 | |
Rusty Russell | a586d4f | 2008-02-04 23:49:56 -0500 | [diff] [blame] | 1007 | /* Append virtqueue to this device's descriptor. We use |
| 1008 | * device_config() to get the end of the device's current virtqueues; |
| 1009 | * we check that we haven't added any config or feature information |
| 1010 | * yet, otherwise we'd be overwriting them. */ |
| 1011 | assert(dev->desc->config_len == 0 && dev->desc->feature_len == 0); |
| 1012 | memcpy(device_config(dev), &vq->config, sizeof(vq->config)); |
Rusty Russell | 713b15b | 2009-06-12 22:26:58 -0600 | [diff] [blame] | 1013 | dev->num_vq++; |
Rusty Russell | a586d4f | 2008-02-04 23:49:56 -0500 | [diff] [blame] | 1014 | dev->desc->num_vq++; |
| 1015 | |
| 1016 | verbose("Virtqueue page %#lx\n", to_guest_phys(p)); |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1017 | |
| 1018 | /* Add to tail of list, so dev->vq is first vq, dev->vq->next is |
| 1019 | * second. */ |
| 1020 | for (i = &dev->vq; *i; i = &(*i)->next); |
| 1021 | *i = vq; |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1022 | } |
| 1023 | |
Rusty Russell | 6e5aa7e | 2008-02-04 23:50:03 -0500 | [diff] [blame] | 1024 | /* The first half of the feature bitmask is for us to advertise features. The |
Rusty Russell | a6bd8e1 | 2008-03-28 11:05:53 -0500 | [diff] [blame] | 1025 | * second half is for the Guest to accept features. */ |
Rusty Russell | a586d4f | 2008-02-04 23:49:56 -0500 | [diff] [blame] | 1026 | static void add_feature(struct device *dev, unsigned bit) |
| 1027 | { |
Rusty Russell | 6e5aa7e | 2008-02-04 23:50:03 -0500 | [diff] [blame] | 1028 | u8 *features = get_feature_bits(dev); |
Rusty Russell | a586d4f | 2008-02-04 23:49:56 -0500 | [diff] [blame] | 1029 | |
| 1030 | /* We can't extend the feature bits once we've added config bytes */ |
| 1031 | if (dev->desc->feature_len <= bit / CHAR_BIT) { |
| 1032 | assert(dev->desc->config_len == 0); |
Rusty Russell | 713b15b | 2009-06-12 22:26:58 -0600 | [diff] [blame] | 1033 | dev->feature_len = dev->desc->feature_len = (bit/CHAR_BIT) + 1; |
Rusty Russell | a586d4f | 2008-02-04 23:49:56 -0500 | [diff] [blame] | 1034 | } |
| 1035 | |
Rusty Russell | a586d4f | 2008-02-04 23:49:56 -0500 | [diff] [blame] | 1036 | features[bit / CHAR_BIT] |= (1 << (bit % CHAR_BIT)); |
| 1037 | } |
| 1038 | |
| 1039 | /* This routine sets the configuration fields for an existing device's |
| 1040 | * descriptor. It only works for the last device, but that's OK because that's |
| 1041 | * how we use it. */ |
| 1042 | static void set_config(struct device *dev, unsigned len, const void *conf) |
| 1043 | { |
| 1044 | /* Check we haven't overflowed our single page. */ |
| 1045 | if (device_config(dev) + len > devices.descpage + getpagesize()) |
| 1046 | errx(1, "Too many devices"); |
| 1047 | |
| 1048 | /* Copy in the config information, and store the length. */ |
| 1049 | memcpy(device_config(dev), conf, len); |
| 1050 | dev->desc->config_len = len; |
| 1051 | } |
| 1052 | |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1053 | /* This routine does all the creation and setup of a new device, including |
Rusty Russell | a6bd8e1 | 2008-03-28 11:05:53 -0500 | [diff] [blame] | 1054 | * calling new_dev_desc() to allocate the descriptor and device memory. |
| 1055 | * |
| 1056 | * See what I mean about userspace being boring? */ |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1057 | static struct device *new_device(const char *name, u16 type) |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1058 | { |
| 1059 | struct device *dev = malloc(sizeof(*dev)); |
| 1060 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 1061 | /* Now we populate the fields one at a time. */ |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1062 | dev->desc = new_dev_desc(type); |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1063 | dev->name = name; |
Rusty Russell | d1c856e | 2007-11-19 11:20:40 -0500 | [diff] [blame] | 1064 | dev->vq = NULL; |
Rusty Russell | 713b15b | 2009-06-12 22:26:58 -0600 | [diff] [blame] | 1065 | dev->feature_len = 0; |
| 1066 | dev->num_vq = 0; |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1067 | dev->running = false; |
Rusty Russell | a586d4f | 2008-02-04 23:49:56 -0500 | [diff] [blame] | 1068 | |
| 1069 | /* Append to device list. Prepending to a single-linked list is |
| 1070 | * easier, but the user expects the devices to be arranged on the bus |
| 1071 | * in command-line order. The first network device on the command line |
| 1072 | * is eth0, the first block device /dev/vda, etc. */ |
| 1073 | if (devices.lastdev) |
| 1074 | devices.lastdev->next = dev; |
| 1075 | else |
| 1076 | devices.dev = dev; |
| 1077 | devices.lastdev = dev; |
| 1078 | |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1079 | return dev; |
| 1080 | } |
| 1081 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 1082 | /* Our first setup routine is the console. It's a fairly simple device, but |
| 1083 | * UNIX tty handling makes it uglier than it could be. */ |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1084 | static void setup_console(void) |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1085 | { |
| 1086 | struct device *dev; |
| 1087 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 1088 | /* If we can save the initial standard input settings... */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1089 | if (tcgetattr(STDIN_FILENO, &orig_term) == 0) { |
| 1090 | struct termios term = orig_term; |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 1091 | /* Then we turn off echo, line buffering and ^C etc. We want a |
| 1092 | * raw input stream to the Guest. */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1093 | term.c_lflag &= ~(ISIG|ICANON|ECHO); |
| 1094 | tcsetattr(STDIN_FILENO, TCSANOW, &term); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1095 | } |
| 1096 | |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1097 | dev = new_device("console", VIRTIO_ID_CONSOLE); |
| 1098 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 1099 | /* We store the console state in dev->priv, and initialize it. */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1100 | dev->priv = malloc(sizeof(struct console_abort)); |
| 1101 | ((struct console_abort *)dev->priv)->count = 0; |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1102 | |
Rusty Russell | 56ae43d | 2007-10-22 11:24:23 +1000 | [diff] [blame] | 1103 | /* The console needs two virtqueues: the input then the output. When |
| 1104 | * they put something the input queue, we make sure we're listening to |
| 1105 | * stdin. When they put something in the output queue, we write it to |
Rusty Russell | e1e7296 | 2007-10-25 15:02:50 +1000 | [diff] [blame] | 1106 | * stdout. */ |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1107 | add_virtqueue(dev, VIRTQUEUE_NUM, console_input); |
| 1108 | add_virtqueue(dev, VIRTQUEUE_NUM, console_output); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1109 | |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1110 | verbose("device %u: console\n", ++devices.device_num); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1111 | } |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 1112 | /*:*/ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1113 | |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1114 | /*M:010 Inter-guest networking is an interesting area. Simplest is to have a |
| 1115 | * --sharenet=<name> option which opens or creates a named pipe. This can be |
| 1116 | * used to send packets to another guest in a 1:1 manner. |
| 1117 | * |
| 1118 | * More sopisticated is to use one of the tools developed for project like UML |
| 1119 | * to do networking. |
| 1120 | * |
| 1121 | * Faster is to do virtio bonding in kernel. Doing this 1:1 would be |
| 1122 | * completely generic ("here's my vring, attach to your vring") and would work |
| 1123 | * for any traffic. Of course, namespace and permissions issues need to be |
| 1124 | * dealt with. A more sophisticated "multi-channel" virtio_net.c could hide |
| 1125 | * multiple inter-guest channels behind one interface, although it would |
| 1126 | * require some manner of hotplugging new virtio channels. |
| 1127 | * |
| 1128 | * Finally, we could implement a virtio network switch in the kernel. :*/ |
| 1129 | |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1130 | static u32 str2ip(const char *ipaddr) |
| 1131 | { |
Mark McLoughlin | dec6a2b | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1132 | unsigned int b[4]; |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1133 | |
Mark McLoughlin | dec6a2b | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1134 | if (sscanf(ipaddr, "%u.%u.%u.%u", &b[0], &b[1], &b[2], &b[3]) != 4) |
| 1135 | errx(1, "Failed to parse IP address '%s'", ipaddr); |
| 1136 | return (b[0] << 24) | (b[1] << 16) | (b[2] << 8) | b[3]; |
| 1137 | } |
| 1138 | |
| 1139 | static void str2mac(const char *macaddr, unsigned char mac[6]) |
| 1140 | { |
| 1141 | unsigned int m[6]; |
| 1142 | if (sscanf(macaddr, "%02x:%02x:%02x:%02x:%02x:%02x", |
| 1143 | &m[0], &m[1], &m[2], &m[3], &m[4], &m[5]) != 6) |
| 1144 | errx(1, "Failed to parse mac address '%s'", macaddr); |
| 1145 | mac[0] = m[0]; |
| 1146 | mac[1] = m[1]; |
| 1147 | mac[2] = m[2]; |
| 1148 | mac[3] = m[3]; |
| 1149 | mac[4] = m[4]; |
| 1150 | mac[5] = m[5]; |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1151 | } |
| 1152 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 1153 | /* This code is "adapted" from libbridge: it attaches the Host end of the |
| 1154 | * network device to the bridge device specified by the command line. |
| 1155 | * |
| 1156 | * This is yet another James Morris contribution (I'm an IP-level guy, so I |
| 1157 | * dislike bridging), and I just try not to break it. */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1158 | static void add_to_bridge(int fd, const char *if_name, const char *br_name) |
| 1159 | { |
| 1160 | int ifidx; |
| 1161 | struct ifreq ifr; |
| 1162 | |
| 1163 | if (!*br_name) |
| 1164 | errx(1, "must specify bridge name"); |
| 1165 | |
| 1166 | ifidx = if_nametoindex(if_name); |
| 1167 | if (!ifidx) |
| 1168 | errx(1, "interface %s does not exist!", if_name); |
| 1169 | |
| 1170 | strncpy(ifr.ifr_name, br_name, IFNAMSIZ); |
Mark McLoughlin | dec6a2b | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1171 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1172 | ifr.ifr_ifindex = ifidx; |
| 1173 | if (ioctl(fd, SIOCBRADDIF, &ifr) < 0) |
| 1174 | err(1, "can't add %s to bridge %s", if_name, br_name); |
| 1175 | } |
| 1176 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 1177 | /* This sets up the Host end of the network device with an IP address, brings |
| 1178 | * it up so packets will flow, the copies the MAC address into the hwaddr |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1179 | * pointer. */ |
Mark McLoughlin | dec6a2b | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1180 | static void configure_device(int fd, const char *tapif, u32 ipaddr) |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1181 | { |
| 1182 | struct ifreq ifr; |
| 1183 | struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; |
| 1184 | |
| 1185 | memset(&ifr, 0, sizeof(ifr)); |
Mark McLoughlin | dec6a2b | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1186 | strcpy(ifr.ifr_name, tapif); |
| 1187 | |
| 1188 | /* Don't read these incantations. Just cut & paste them like I did! */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1189 | sin->sin_family = AF_INET; |
| 1190 | sin->sin_addr.s_addr = htonl(ipaddr); |
| 1191 | if (ioctl(fd, SIOCSIFADDR, &ifr) != 0) |
Mark McLoughlin | dec6a2b | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1192 | err(1, "Setting %s interface address", tapif); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1193 | ifr.ifr_flags = IFF_UP; |
| 1194 | if (ioctl(fd, SIOCSIFFLAGS, &ifr) != 0) |
Mark McLoughlin | dec6a2b | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1195 | err(1, "Bringing interface %s up", tapif); |
| 1196 | } |
| 1197 | |
Mark McLoughlin | dec6a2b | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1198 | static int get_tun_device(char tapif[IFNAMSIZ]) |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1199 | { |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1200 | struct ifreq ifr; |
Mark McLoughlin | dec6a2b | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1201 | int netfd; |
| 1202 | |
| 1203 | /* Start with this zeroed. Messy but sure. */ |
| 1204 | memset(&ifr, 0, sizeof(ifr)); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1205 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 1206 | /* We open the /dev/net/tun device and tell it we want a tap device. A |
| 1207 | * tap device is like a tun device, only somehow different. To tell |
| 1208 | * the truth, I completely blundered my way through this code, but it |
| 1209 | * works now! */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1210 | netfd = open_or_die("/dev/net/tun", O_RDWR); |
Rusty Russell | 398f187 | 2008-07-29 09:58:37 -0500 | [diff] [blame] | 1211 | ifr.ifr_flags = IFF_TAP | IFF_NO_PI | IFF_VNET_HDR; |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1212 | strcpy(ifr.ifr_name, "tap%d"); |
| 1213 | if (ioctl(netfd, TUNSETIFF, &ifr) != 0) |
| 1214 | err(1, "configuring /dev/net/tun"); |
Mark McLoughlin | dec6a2b | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1215 | |
Rusty Russell | 398f187 | 2008-07-29 09:58:37 -0500 | [diff] [blame] | 1216 | if (ioctl(netfd, TUNSETOFFLOAD, |
| 1217 | TUN_F_CSUM|TUN_F_TSO4|TUN_F_TSO6|TUN_F_TSO_ECN) != 0) |
| 1218 | err(1, "Could not set features for tun device"); |
| 1219 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 1220 | /* We don't need checksums calculated for packets coming in this |
| 1221 | * device: trust us! */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1222 | ioctl(netfd, TUNSETNOCSUM, 1); |
| 1223 | |
Mark McLoughlin | dec6a2b | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1224 | memcpy(tapif, ifr.ifr_name, IFNAMSIZ); |
| 1225 | return netfd; |
| 1226 | } |
| 1227 | |
| 1228 | /*L:195 Our network is a Host<->Guest network. This can either use bridging or |
| 1229 | * routing, but the principle is the same: it uses the "tun" device to inject |
| 1230 | * packets into the Host as if they came in from a normal network card. We |
| 1231 | * just shunt packets between the Guest and the tun device. */ |
| 1232 | static void setup_tun_net(char *arg) |
| 1233 | { |
| 1234 | struct device *dev; |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1235 | struct net_info *net_info = malloc(sizeof(*net_info)); |
| 1236 | int ipfd; |
Mark McLoughlin | dec6a2b | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1237 | u32 ip = INADDR_ANY; |
| 1238 | bool bridging = false; |
| 1239 | char tapif[IFNAMSIZ], *p; |
| 1240 | struct virtio_net_config conf; |
| 1241 | |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1242 | net_info->tunfd = get_tun_device(tapif); |
Mark McLoughlin | dec6a2b | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1243 | |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1244 | /* First we create a new network device. */ |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1245 | dev = new_device("net", VIRTIO_ID_NET); |
| 1246 | dev->priv = net_info; |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 1247 | |
Rusty Russell | 56ae43d | 2007-10-22 11:24:23 +1000 | [diff] [blame] | 1248 | /* Network devices need a receive and a send queue, just like |
| 1249 | * console. */ |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1250 | add_virtqueue(dev, VIRTQUEUE_NUM, net_input); |
| 1251 | add_virtqueue(dev, VIRTQUEUE_NUM, net_output); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1252 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 1253 | /* We need a socket to perform the magic network ioctls to bring up the |
| 1254 | * tap interface, connect to the bridge etc. Any socket will do! */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1255 | ipfd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP); |
| 1256 | if (ipfd < 0) |
| 1257 | err(1, "opening IP socket"); |
| 1258 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 1259 | /* If the command line was --tunnet=bridge:<name> do bridging. */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1260 | if (!strncmp(BRIDGE_PFX, arg, strlen(BRIDGE_PFX))) { |
Mark McLoughlin | dec6a2b | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1261 | arg += strlen(BRIDGE_PFX); |
| 1262 | bridging = true; |
| 1263 | } |
| 1264 | |
| 1265 | /* A mac address may follow the bridge name or IP address */ |
| 1266 | p = strchr(arg, ':'); |
| 1267 | if (p) { |
| 1268 | str2mac(p+1, conf.mac); |
Rusty Russell | 40c4207 | 2008-08-12 17:52:51 -0500 | [diff] [blame] | 1269 | add_feature(dev, VIRTIO_NET_F_MAC); |
Mark McLoughlin | dec6a2b | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1270 | *p = '\0'; |
Mark McLoughlin | dec6a2b | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1271 | } |
| 1272 | |
| 1273 | /* arg is now either an IP address or a bridge name */ |
| 1274 | if (bridging) |
| 1275 | add_to_bridge(ipfd, tapif, arg); |
| 1276 | else |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1277 | ip = str2ip(arg); |
| 1278 | |
Mark McLoughlin | dec6a2b | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1279 | /* Set up the tun device. */ |
| 1280 | configure_device(ipfd, tapif, ip); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1281 | |
Rusty Russell | 2088761 | 2008-05-30 15:09:46 -0500 | [diff] [blame] | 1282 | add_feature(dev, VIRTIO_F_NOTIFY_ON_EMPTY); |
Rusty Russell | 398f187 | 2008-07-29 09:58:37 -0500 | [diff] [blame] | 1283 | /* Expect Guest to handle everything except UFO */ |
| 1284 | add_feature(dev, VIRTIO_NET_F_CSUM); |
| 1285 | add_feature(dev, VIRTIO_NET_F_GUEST_CSUM); |
Rusty Russell | 398f187 | 2008-07-29 09:58:37 -0500 | [diff] [blame] | 1286 | add_feature(dev, VIRTIO_NET_F_GUEST_TSO4); |
| 1287 | add_feature(dev, VIRTIO_NET_F_GUEST_TSO6); |
| 1288 | add_feature(dev, VIRTIO_NET_F_GUEST_ECN); |
| 1289 | add_feature(dev, VIRTIO_NET_F_HOST_TSO4); |
| 1290 | add_feature(dev, VIRTIO_NET_F_HOST_TSO6); |
| 1291 | add_feature(dev, VIRTIO_NET_F_HOST_ECN); |
Rusty Russell | a586d4f | 2008-02-04 23:49:56 -0500 | [diff] [blame] | 1292 | set_config(dev, sizeof(conf), &conf); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1293 | |
Rusty Russell | a586d4f | 2008-02-04 23:49:56 -0500 | [diff] [blame] | 1294 | /* We don't need the socket any more; setup is done. */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1295 | close(ipfd); |
| 1296 | |
Mark McLoughlin | dec6a2b | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1297 | devices.device_num++; |
| 1298 | |
| 1299 | if (bridging) |
| 1300 | verbose("device %u: tun %s attached to bridge: %s\n", |
| 1301 | devices.device_num, tapif, arg); |
| 1302 | else |
| 1303 | verbose("device %u: tun %s: %s\n", |
| 1304 | devices.device_num, tapif, arg); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1305 | } |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1306 | |
Rusty Russell | e1e7296 | 2007-10-25 15:02:50 +1000 | [diff] [blame] | 1307 | /* Our block (disk) device should be really simple: the Guest asks for a block |
| 1308 | * number and we read or write that position in the file. Unfortunately, that |
| 1309 | * was amazingly slow: the Guest waits until the read is finished before |
| 1310 | * running anything else, even if it could have been doing useful work. |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1311 | * |
Rusty Russell | e1e7296 | 2007-10-25 15:02:50 +1000 | [diff] [blame] | 1312 | * We could use async I/O, except it's reputed to suck so hard that characters |
| 1313 | * actually go missing from your code when you try to use it. |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1314 | * |
| 1315 | * So we farm the I/O out to thread, and communicate with it via a pipe. */ |
| 1316 | |
Rusty Russell | e1e7296 | 2007-10-25 15:02:50 +1000 | [diff] [blame] | 1317 | /* This hangs off device->priv. */ |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1318 | struct vblk_info |
| 1319 | { |
| 1320 | /* The size of the file. */ |
| 1321 | off64_t len; |
| 1322 | |
| 1323 | /* The file descriptor for the file. */ |
| 1324 | int fd; |
| 1325 | |
| 1326 | /* IO thread listens on this file descriptor [0]. */ |
| 1327 | int workpipe[2]; |
| 1328 | |
| 1329 | /* IO thread writes to this file descriptor to mark it done, then |
| 1330 | * Launcher triggers interrupt to Guest. */ |
| 1331 | int done_fd; |
| 1332 | }; |
| 1333 | |
Rusty Russell | e1e7296 | 2007-10-25 15:02:50 +1000 | [diff] [blame] | 1334 | /*L:210 |
| 1335 | * The Disk |
| 1336 | * |
| 1337 | * Remember that the block device is handled by a separate I/O thread. We head |
| 1338 | * straight into the core of that thread here: |
| 1339 | */ |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1340 | static void blk_request(struct virtqueue *vq) |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1341 | { |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1342 | struct vblk_info *vblk = vq->dev->priv; |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1343 | unsigned int head, out_num, in_num, wlen; |
| 1344 | int ret; |
Rusty Russell | cb38fa2 | 2008-05-02 21:50:45 -0500 | [diff] [blame] | 1345 | u8 *in; |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1346 | struct virtio_blk_outhdr *out; |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1347 | struct iovec iov[vq->vring.num]; |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1348 | off64_t off; |
| 1349 | |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1350 | /* Get the next request. */ |
| 1351 | head = wait_for_vq_desc(vq, iov, &out_num, &in_num); |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1352 | |
Rusty Russell | e1e7296 | 2007-10-25 15:02:50 +1000 | [diff] [blame] | 1353 | /* Every block request should contain at least one output buffer |
| 1354 | * (detailing the location on disk and the type of request) and one |
| 1355 | * input buffer (to hold the result). */ |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1356 | if (out_num == 0 || in_num == 0) |
| 1357 | errx(1, "Bad virtblk cmd %u out=%u in=%u", |
| 1358 | head, out_num, in_num); |
| 1359 | |
| 1360 | out = convert(&iov[0], struct virtio_blk_outhdr); |
Rusty Russell | cb38fa2 | 2008-05-02 21:50:45 -0500 | [diff] [blame] | 1361 | in = convert(&iov[out_num+in_num-1], u8); |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1362 | off = out->sector * 512; |
| 1363 | |
Rusty Russell | e1e7296 | 2007-10-25 15:02:50 +1000 | [diff] [blame] | 1364 | /* The block device implements "barriers", where the Guest indicates |
| 1365 | * that it wants all previous writes to occur before this write. We |
| 1366 | * don't have a way of asking our kernel to do a barrier, so we just |
| 1367 | * synchronize all the data in the file. Pretty poor, no? */ |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1368 | if (out->type & VIRTIO_BLK_T_BARRIER) |
| 1369 | fdatasync(vblk->fd); |
| 1370 | |
Rusty Russell | e1e7296 | 2007-10-25 15:02:50 +1000 | [diff] [blame] | 1371 | /* In general the virtio block driver is allowed to try SCSI commands. |
| 1372 | * It'd be nice if we supported eject, for example, but we don't. */ |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1373 | if (out->type & VIRTIO_BLK_T_SCSI_CMD) { |
| 1374 | fprintf(stderr, "Scsi commands unsupported\n"); |
Rusty Russell | cb38fa2 | 2008-05-02 21:50:45 -0500 | [diff] [blame] | 1375 | *in = VIRTIO_BLK_S_UNSUPP; |
Anthony Liguori | 1200e64 | 2007-11-08 21:13:44 -0600 | [diff] [blame] | 1376 | wlen = sizeof(*in); |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1377 | } else if (out->type & VIRTIO_BLK_T_OUT) { |
| 1378 | /* Write */ |
| 1379 | |
| 1380 | /* Move to the right location in the block file. This can fail |
| 1381 | * if they try to write past end. */ |
| 1382 | if (lseek64(vblk->fd, off, SEEK_SET) != off) |
| 1383 | err(1, "Bad seek to sector %llu", out->sector); |
| 1384 | |
| 1385 | ret = writev(vblk->fd, iov+1, out_num-1); |
| 1386 | verbose("WRITE to sector %llu: %i\n", out->sector, ret); |
| 1387 | |
| 1388 | /* Grr... Now we know how long the descriptor they sent was, we |
| 1389 | * make sure they didn't try to write over the end of the block |
| 1390 | * file (possibly extending it). */ |
| 1391 | if (ret > 0 && off + ret > vblk->len) { |
| 1392 | /* Trim it back to the correct length */ |
| 1393 | ftruncate64(vblk->fd, vblk->len); |
| 1394 | /* Die, bad Guest, die. */ |
| 1395 | errx(1, "Write past end %llu+%u", off, ret); |
| 1396 | } |
Anthony Liguori | 1200e64 | 2007-11-08 21:13:44 -0600 | [diff] [blame] | 1397 | wlen = sizeof(*in); |
Rusty Russell | cb38fa2 | 2008-05-02 21:50:45 -0500 | [diff] [blame] | 1398 | *in = (ret >= 0 ? VIRTIO_BLK_S_OK : VIRTIO_BLK_S_IOERR); |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1399 | } else { |
| 1400 | /* Read */ |
| 1401 | |
| 1402 | /* Move to the right location in the block file. This can fail |
| 1403 | * if they try to read past end. */ |
| 1404 | if (lseek64(vblk->fd, off, SEEK_SET) != off) |
| 1405 | err(1, "Bad seek to sector %llu", out->sector); |
| 1406 | |
| 1407 | ret = readv(vblk->fd, iov+1, in_num-1); |
| 1408 | verbose("READ from sector %llu: %i\n", out->sector, ret); |
| 1409 | if (ret >= 0) { |
Anthony Liguori | 1200e64 | 2007-11-08 21:13:44 -0600 | [diff] [blame] | 1410 | wlen = sizeof(*in) + ret; |
Rusty Russell | cb38fa2 | 2008-05-02 21:50:45 -0500 | [diff] [blame] | 1411 | *in = VIRTIO_BLK_S_OK; |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1412 | } else { |
Anthony Liguori | 1200e64 | 2007-11-08 21:13:44 -0600 | [diff] [blame] | 1413 | wlen = sizeof(*in); |
Rusty Russell | cb38fa2 | 2008-05-02 21:50:45 -0500 | [diff] [blame] | 1414 | *in = VIRTIO_BLK_S_IOERR; |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1415 | } |
| 1416 | } |
| 1417 | |
Rusty Russell | d1881d3 | 2009-03-30 21:55:25 -0600 | [diff] [blame] | 1418 | /* OK, so we noted that it was pretty poor to use an fdatasync as a |
| 1419 | * barrier. But Christoph Hellwig points out that we need a sync |
| 1420 | * *afterwards* as well: "Barriers specify no reordering to the front |
| 1421 | * or the back." And Jens Axboe confirmed it, so here we are: */ |
| 1422 | if (out->type & VIRTIO_BLK_T_BARRIER) |
| 1423 | fdatasync(vblk->fd); |
| 1424 | |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1425 | add_used_and_trigger(vq, head, wlen); |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1426 | } |
| 1427 | |
Rusty Russell | e1e7296 | 2007-10-25 15:02:50 +1000 | [diff] [blame] | 1428 | /*L:198 This actually sets up a virtual block device. */ |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1429 | static void setup_block_file(const char *filename) |
| 1430 | { |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1431 | struct device *dev; |
| 1432 | struct vblk_info *vblk; |
Rusty Russell | a586d4f | 2008-02-04 23:49:56 -0500 | [diff] [blame] | 1433 | struct virtio_blk_config conf; |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1434 | |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1435 | /* The device responds to return from I/O thread. */ |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1436 | dev = new_device("block", VIRTIO_ID_BLOCK); |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1437 | |
Rusty Russell | e1e7296 | 2007-10-25 15:02:50 +1000 | [diff] [blame] | 1438 | /* The device has one virtqueue, where the Guest places requests. */ |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1439 | add_virtqueue(dev, VIRTQUEUE_NUM, blk_request); |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1440 | |
| 1441 | /* Allocate the room for our own bookkeeping */ |
| 1442 | vblk = dev->priv = malloc(sizeof(*vblk)); |
| 1443 | |
| 1444 | /* First we open the file and store the length. */ |
| 1445 | vblk->fd = open_or_die(filename, O_RDWR|O_LARGEFILE); |
| 1446 | vblk->len = lseek64(vblk->fd, 0, SEEK_END); |
| 1447 | |
Rusty Russell | a586d4f | 2008-02-04 23:49:56 -0500 | [diff] [blame] | 1448 | /* We support barriers. */ |
| 1449 | add_feature(dev, VIRTIO_BLK_F_BARRIER); |
| 1450 | |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1451 | /* Tell Guest how many sectors this device has. */ |
Rusty Russell | a586d4f | 2008-02-04 23:49:56 -0500 | [diff] [blame] | 1452 | conf.capacity = cpu_to_le64(vblk->len / 512); |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1453 | |
| 1454 | /* Tell Guest not to put in too many descriptors at once: two are used |
| 1455 | * for the in and out elements. */ |
Rusty Russell | a586d4f | 2008-02-04 23:49:56 -0500 | [diff] [blame] | 1456 | add_feature(dev, VIRTIO_BLK_F_SEG_MAX); |
| 1457 | conf.seg_max = cpu_to_le32(VIRTQUEUE_NUM - 2); |
| 1458 | |
| 1459 | set_config(dev, sizeof(conf), &conf); |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1460 | |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1461 | verbose("device %u: virtblock %llu sectors\n", |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1462 | ++devices.device_num, le64_to_cpu(conf.capacity)); |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1463 | } |
Rusty Russell | 28fd6d7 | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1464 | |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1465 | struct rng_info { |
| 1466 | int rfd; |
| 1467 | }; |
| 1468 | |
Rusty Russell | 28fd6d7 | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1469 | /* Our random number generator device reads from /dev/random into the Guest's |
| 1470 | * input buffers. The usual case is that the Guest doesn't want random numbers |
| 1471 | * and so has no buffers although /dev/random is still readable, whereas |
| 1472 | * console is the reverse. |
| 1473 | * |
| 1474 | * The same logic applies, however. */ |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1475 | static void rng_input(struct virtqueue *vq) |
Rusty Russell | 28fd6d7 | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1476 | { |
| 1477 | int len; |
| 1478 | unsigned int head, in_num, out_num, totlen = 0; |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1479 | struct rng_info *rng_info = vq->dev->priv; |
| 1480 | struct iovec iov[vq->vring.num]; |
Rusty Russell | 28fd6d7 | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1481 | |
| 1482 | /* First we need a buffer from the Guests's virtqueue. */ |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1483 | head = wait_for_vq_desc(vq, iov, &out_num, &in_num); |
Rusty Russell | 28fd6d7 | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1484 | if (out_num) |
| 1485 | errx(1, "Output buffers in rng?"); |
| 1486 | |
| 1487 | /* This is why we convert to iovecs: the readv() call uses them, and so |
| 1488 | * it reads straight into the Guest's buffer. We loop to make sure we |
| 1489 | * fill it. */ |
| 1490 | while (!iov_empty(iov, in_num)) { |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1491 | len = readv(rng_info->rfd, iov, in_num); |
Rusty Russell | 28fd6d7 | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1492 | if (len <= 0) |
| 1493 | err(1, "Read from /dev/random gave %i", len); |
| 1494 | iov_consume(iov, in_num, len); |
| 1495 | totlen += len; |
| 1496 | } |
| 1497 | |
| 1498 | /* Tell the Guest about the new input. */ |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1499 | add_used_and_trigger(vq, head, totlen); |
Rusty Russell | 28fd6d7 | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1500 | } |
| 1501 | |
| 1502 | /* And this creates a "hardware" random number device for the Guest. */ |
| 1503 | static void setup_rng(void) |
| 1504 | { |
| 1505 | struct device *dev; |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1506 | struct rng_info *rng_info = malloc(sizeof(*rng_info)); |
Rusty Russell | 28fd6d7 | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1507 | |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1508 | rng_info->rfd = open_or_die("/dev/random", O_RDONLY); |
Rusty Russell | 28fd6d7 | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1509 | |
| 1510 | /* The device responds to return from I/O thread. */ |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1511 | dev = new_device("rng", VIRTIO_ID_RNG); |
| 1512 | dev->priv = rng_info; |
Rusty Russell | 28fd6d7 | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1513 | |
| 1514 | /* The device has one virtqueue, where the Guest places inbufs. */ |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1515 | add_virtqueue(dev, VIRTQUEUE_NUM, rng_input); |
Rusty Russell | 28fd6d7 | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1516 | |
| 1517 | verbose("device %u: rng\n", devices.device_num++); |
| 1518 | } |
Rusty Russell | a6bd8e1 | 2008-03-28 11:05:53 -0500 | [diff] [blame] | 1519 | /* That's the end of device setup. */ |
Balaji Rao | ec04b13 | 2007-12-28 14:26:24 +0530 | [diff] [blame] | 1520 | |
Rusty Russell | a6bd8e1 | 2008-03-28 11:05:53 -0500 | [diff] [blame] | 1521 | /*L:230 Reboot is pretty easy: clean up and exec() the Launcher afresh. */ |
Balaji Rao | ec04b13 | 2007-12-28 14:26:24 +0530 | [diff] [blame] | 1522 | static void __attribute__((noreturn)) restart_guest(void) |
| 1523 | { |
| 1524 | unsigned int i; |
| 1525 | |
Rusty Russell | 8c79873 | 2008-07-29 09:58:38 -0500 | [diff] [blame] | 1526 | /* Since we don't track all open fds, we simply close everything beyond |
| 1527 | * stderr. */ |
Balaji Rao | ec04b13 | 2007-12-28 14:26:24 +0530 | [diff] [blame] | 1528 | for (i = 3; i < FD_SETSIZE; i++) |
| 1529 | close(i); |
Rusty Russell | 8c79873 | 2008-07-29 09:58:38 -0500 | [diff] [blame] | 1530 | |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1531 | /* Reset all the devices (kills all threads). */ |
| 1532 | cleanup_devices(); |
| 1533 | |
Balaji Rao | ec04b13 | 2007-12-28 14:26:24 +0530 | [diff] [blame] | 1534 | execv(main_args[0], main_args); |
| 1535 | err(1, "Could not exec %s", main_args[0]); |
| 1536 | } |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1537 | |
Rusty Russell | a6bd8e1 | 2008-03-28 11:05:53 -0500 | [diff] [blame] | 1538 | /*L:220 Finally we reach the core of the Launcher which runs the Guest, serves |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 1539 | * its input and output, and finally, lays it to rest. */ |
Rusty Russell | 56739c80 | 2009-06-12 22:26:59 -0600 | [diff] [blame] | 1540 | static void __attribute__((noreturn)) run_guest(void) |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1541 | { |
| 1542 | for (;;) { |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1543 | unsigned long notify_addr; |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1544 | int readval; |
| 1545 | |
| 1546 | /* We read from the /dev/lguest device to run the Guest. */ |
Glauber de Oliveira Costa | e3283fa | 2008-01-07 11:05:23 -0200 | [diff] [blame] | 1547 | readval = pread(lguest_fd, ¬ify_addr, |
| 1548 | sizeof(notify_addr), cpu_id); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1549 | |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1550 | /* One unsigned long means the Guest did HCALL_NOTIFY */ |
| 1551 | if (readval == sizeof(notify_addr)) { |
| 1552 | verbose("Notify on address %#lx\n", notify_addr); |
Rusty Russell | 56739c80 | 2009-06-12 22:26:59 -0600 | [diff] [blame] | 1553 | handle_output(notify_addr); |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 1554 | /* ENOENT means the Guest died. Reading tells us why. */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1555 | } else if (errno == ENOENT) { |
| 1556 | char reason[1024] = { 0 }; |
Glauber de Oliveira Costa | e3283fa | 2008-01-07 11:05:23 -0200 | [diff] [blame] | 1557 | pread(lguest_fd, reason, sizeof(reason)-1, cpu_id); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1558 | errx(1, "%s", reason); |
Balaji Rao | ec04b13 | 2007-12-28 14:26:24 +0530 | [diff] [blame] | 1559 | /* ERESTART means that we need to reboot the guest */ |
| 1560 | } else if (errno == ERESTART) { |
| 1561 | restart_guest(); |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1562 | /* Anything else means a bug or incompatible change. */ |
| 1563 | } else |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1564 | err(1, "Running guest failed"); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1565 | } |
| 1566 | } |
Rusty Russell | a6bd8e1 | 2008-03-28 11:05:53 -0500 | [diff] [blame] | 1567 | /*L:240 |
Rusty Russell | e1e7296 | 2007-10-25 15:02:50 +1000 | [diff] [blame] | 1568 | * This is the end of the Launcher. The good news: we are over halfway |
| 1569 | * through! The bad news: the most fiendish part of the code still lies ahead |
| 1570 | * of us. |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 1571 | * |
Rusty Russell | e1e7296 | 2007-10-25 15:02:50 +1000 | [diff] [blame] | 1572 | * Are you ready? Take a deep breath and join me in the core of the Host, in |
| 1573 | * "make Host". |
| 1574 | :*/ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1575 | |
| 1576 | static struct option opts[] = { |
| 1577 | { "verbose", 0, NULL, 'v' }, |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1578 | { "tunnet", 1, NULL, 't' }, |
| 1579 | { "block", 1, NULL, 'b' }, |
Rusty Russell | 28fd6d7 | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1580 | { "rng", 0, NULL, 'r' }, |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1581 | { "initrd", 1, NULL, 'i' }, |
| 1582 | { NULL }, |
| 1583 | }; |
| 1584 | static void usage(void) |
| 1585 | { |
| 1586 | errx(1, "Usage: lguest [--verbose] " |
Mark McLoughlin | dec6a2b | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1587 | "[--tunnet=(<ipaddr>:<macaddr>|bridge:<bridgename>:<macaddr>)\n" |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1588 | "|--block=<filename>|--initrd=<filename>]...\n" |
| 1589 | "<mem-in-mb> vmlinux [args...]"); |
| 1590 | } |
| 1591 | |
Rusty Russell | 3c6b5bf | 2007-10-22 11:03:26 +1000 | [diff] [blame] | 1592 | /*L:105 The main routine is where the real work begins: */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1593 | int main(int argc, char *argv[]) |
| 1594 | { |
Rusty Russell | 47436aa | 2007-10-22 11:03:36 +1000 | [diff] [blame] | 1595 | /* Memory, top-level pagetable, code startpoint and size of the |
| 1596 | * (optional) initrd. */ |
Matias Zabaljauregui | 58a2456 | 2008-09-29 01:40:07 -0300 | [diff] [blame] | 1597 | unsigned long mem = 0, start, initrd_size = 0; |
Rusty Russell | 56739c80 | 2009-06-12 22:26:59 -0600 | [diff] [blame] | 1598 | /* Two temporaries. */ |
| 1599 | int i, c; |
Rusty Russell | 3c6b5bf | 2007-10-22 11:03:26 +1000 | [diff] [blame] | 1600 | /* The boot information for the Guest. */ |
Rusty Russell | 43d33b2 | 2007-10-22 11:29:57 +1000 | [diff] [blame] | 1601 | struct boot_params *boot; |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 1602 | /* If they specify an initrd file to load. */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1603 | const char *initrd_name = NULL; |
| 1604 | |
Balaji Rao | ec04b13 | 2007-12-28 14:26:24 +0530 | [diff] [blame] | 1605 | /* Save the args: we "reboot" by execing ourselves again. */ |
| 1606 | main_args = argv; |
Balaji Rao | ec04b13 | 2007-12-28 14:26:24 +0530 | [diff] [blame] | 1607 | |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1608 | /* First we initialize the device list. We keep a pointer to the last |
| 1609 | * device, and the next interrupt number to use for devices (1: |
| 1610 | * remember that 0 is used by the timer). */ |
Rusty Russell | a586d4f | 2008-02-04 23:49:56 -0500 | [diff] [blame] | 1611 | devices.lastdev = NULL; |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1612 | devices.next_irq = 1; |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1613 | |
Glauber de Oliveira Costa | e3283fa | 2008-01-07 11:05:23 -0200 | [diff] [blame] | 1614 | cpu_id = 0; |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 1615 | /* We need to know how much memory so we can set up the device |
| 1616 | * descriptor and memory pages for the devices as we parse the command |
| 1617 | * line. So we quickly look through the arguments to find the amount |
| 1618 | * of memory now. */ |
Rusty Russell | 6570c4599 | 2007-07-23 18:43:56 -0700 | [diff] [blame] | 1619 | for (i = 1; i < argc; i++) { |
| 1620 | if (argv[i][0] != '-') { |
Rusty Russell | 3c6b5bf | 2007-10-22 11:03:26 +1000 | [diff] [blame] | 1621 | mem = atoi(argv[i]) * 1024 * 1024; |
| 1622 | /* We start by mapping anonymous pages over all of |
| 1623 | * guest-physical memory range. This fills it with 0, |
| 1624 | * and ensures that the Guest won't be killed when it |
| 1625 | * tries to access it. */ |
| 1626 | guest_base = map_zeroed_pages(mem / getpagesize() |
| 1627 | + DEVICE_PAGES); |
| 1628 | guest_limit = mem; |
| 1629 | guest_max = mem + DEVICE_PAGES*getpagesize(); |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1630 | devices.descpage = get_pages(1); |
Rusty Russell | 6570c4599 | 2007-07-23 18:43:56 -0700 | [diff] [blame] | 1631 | break; |
| 1632 | } |
| 1633 | } |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 1634 | |
| 1635 | /* The options are fairly straight-forward */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1636 | while ((c = getopt_long(argc, argv, "v", opts, NULL)) != EOF) { |
| 1637 | switch (c) { |
| 1638 | case 'v': |
| 1639 | verbose = true; |
| 1640 | break; |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1641 | case 't': |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1642 | setup_tun_net(optarg); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1643 | break; |
| 1644 | case 'b': |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1645 | setup_block_file(optarg); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1646 | break; |
Rusty Russell | 28fd6d7 | 2008-07-29 09:58:33 -0500 | [diff] [blame] | 1647 | case 'r': |
| 1648 | setup_rng(); |
| 1649 | break; |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1650 | case 'i': |
| 1651 | initrd_name = optarg; |
| 1652 | break; |
| 1653 | default: |
| 1654 | warnx("Unknown argument %s", argv[optind]); |
| 1655 | usage(); |
| 1656 | } |
| 1657 | } |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 1658 | /* After the other arguments we expect memory and kernel image name, |
| 1659 | * followed by command line arguments for the kernel. */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1660 | if (optind + 2 > argc) |
| 1661 | usage(); |
| 1662 | |
Rusty Russell | 3c6b5bf | 2007-10-22 11:03:26 +1000 | [diff] [blame] | 1663 | verbose("Guest base is at %p\n", guest_base); |
| 1664 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 1665 | /* We always have a console device */ |
Rusty Russell | 17cbca2 | 2007-10-22 11:24:22 +1000 | [diff] [blame] | 1666 | setup_console(); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1667 | |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1668 | /* Now we load the kernel */ |
Rusty Russell | 47436aa | 2007-10-22 11:03:36 +1000 | [diff] [blame] | 1669 | start = load_kernel(open_or_die(argv[optind+1], O_RDONLY)); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1670 | |
Rusty Russell | 3c6b5bf | 2007-10-22 11:03:26 +1000 | [diff] [blame] | 1671 | /* Boot information is stashed at physical address 0 */ |
| 1672 | boot = from_guest_phys(0); |
| 1673 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 1674 | /* Map the initrd image if requested (at top of physical memory) */ |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1675 | if (initrd_name) { |
| 1676 | initrd_size = load_initrd(initrd_name, mem); |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 1677 | /* These are the location in the Linux boot header where the |
| 1678 | * start and size of the initrd are expected to be found. */ |
Rusty Russell | 43d33b2 | 2007-10-22 11:29:57 +1000 | [diff] [blame] | 1679 | boot->hdr.ramdisk_image = mem - initrd_size; |
| 1680 | boot->hdr.ramdisk_size = initrd_size; |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 1681 | /* The bootloader type 0xFF means "unknown"; that's OK. */ |
Rusty Russell | 43d33b2 | 2007-10-22 11:29:57 +1000 | [diff] [blame] | 1682 | boot->hdr.type_of_loader = 0xFF; |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1683 | } |
| 1684 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 1685 | /* The Linux boot header contains an "E820" memory map: ours is a |
| 1686 | * simple, single region. */ |
Rusty Russell | 43d33b2 | 2007-10-22 11:29:57 +1000 | [diff] [blame] | 1687 | boot->e820_entries = 1; |
| 1688 | boot->e820_map[0] = ((struct e820entry) { 0, mem, E820_RAM }); |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 1689 | /* The boot header contains a command line pointer: we put the command |
Rusty Russell | 43d33b2 | 2007-10-22 11:29:57 +1000 | [diff] [blame] | 1690 | * line after the boot header. */ |
| 1691 | boot->hdr.cmd_line_ptr = to_guest_phys(boot + 1); |
Rusty Russell | e1e7296 | 2007-10-25 15:02:50 +1000 | [diff] [blame] | 1692 | /* We use a simple helper to copy the arguments separated by spaces. */ |
Rusty Russell | 43d33b2 | 2007-10-22 11:29:57 +1000 | [diff] [blame] | 1693 | concat((char *)(boot + 1), argv+optind+2); |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 1694 | |
Rusty Russell | 814a0e5 | 2007-10-22 11:29:44 +1000 | [diff] [blame] | 1695 | /* Boot protocol version: 2.07 supports the fields for lguest. */ |
Rusty Russell | 43d33b2 | 2007-10-22 11:29:57 +1000 | [diff] [blame] | 1696 | boot->hdr.version = 0x207; |
Rusty Russell | 814a0e5 | 2007-10-22 11:29:44 +1000 | [diff] [blame] | 1697 | |
| 1698 | /* The hardware_subarch value of "1" tells the Guest it's an lguest. */ |
Rusty Russell | 43d33b2 | 2007-10-22 11:29:57 +1000 | [diff] [blame] | 1699 | boot->hdr.hardware_subarch = 1; |
Rusty Russell | 814a0e5 | 2007-10-22 11:29:44 +1000 | [diff] [blame] | 1700 | |
Rusty Russell | 43d33b2 | 2007-10-22 11:29:57 +1000 | [diff] [blame] | 1701 | /* Tell the entry path not to try to reload segment registers. */ |
| 1702 | boot->hdr.loadflags |= KEEP_SEGMENTS; |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1703 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 1704 | /* We tell the kernel to initialize the Guest: this returns the open |
| 1705 | * /dev/lguest file descriptor. */ |
Rusty Russell | 56739c80 | 2009-06-12 22:26:59 -0600 | [diff] [blame] | 1706 | tell_kernel(start); |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 1707 | |
Rusty Russell | 659a0e6 | 2009-06-12 22:27:10 -0600 | [diff] [blame] | 1708 | /* Ensure that we terminate if a child dies. */ |
| 1709 | signal(SIGCHLD, kill_launcher); |
| 1710 | |
| 1711 | /* If we exit via err(), this kills all the threads, restores tty. */ |
| 1712 | atexit(cleanup_devices); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1713 | |
Rusty Russell | dde7978 | 2007-07-26 10:41:03 -0700 | [diff] [blame] | 1714 | /* Finally, run the Guest. This doesn't return. */ |
Rusty Russell | 56739c80 | 2009-06-12 22:26:59 -0600 | [diff] [blame] | 1715 | run_guest(); |
Rusty Russell | 8ca47e0 | 2007-07-19 01:49:29 -0700 | [diff] [blame] | 1716 | } |
Rusty Russell | f56a384 | 2007-07-26 10:41:05 -0700 | [diff] [blame] | 1717 | /*:*/ |
| 1718 | |
| 1719 | /*M:999 |
| 1720 | * Mastery is done: you now know everything I do. |
| 1721 | * |
| 1722 | * But surely you have seen code, features and bugs in your wanderings which |
| 1723 | * you now yearn to attack? That is the real game, and I look forward to you |
| 1724 | * patching and forking lguest into the Your-Name-Here-visor. |
| 1725 | * |
| 1726 | * Farewell, and good coding! |
| 1727 | * Rusty Russell. |
| 1728 | */ |