blob: 0992523011328028e49983142b5f769fa4e572e0 [file] [log] [blame]
Rusty Russell2e04ef72009-07-30 16:03:45 -06001/*P:400
2 * This contains run_guest() which actually calls into the Host<->Guest
Rusty Russellf938d2c2007-07-26 10:41:02 -07003 * Switcher and analyzes the return, such as determining if the Guest wants the
Rusty Russell2e04ef72009-07-30 16:03:45 -06004 * Host to do something. This file also contains useful helper routines.
5:*/
Rusty Russelld7e28ff2007-07-19 01:49:23 -07006#include <linux/module.h>
7#include <linux/stringify.h>
8#include <linux/stddef.h>
9#include <linux/io.h>
10#include <linux/mm.h>
11#include <linux/vmalloc.h>
12#include <linux/cpu.h>
13#include <linux/freezer.h>
Jes Sorensen625efab2007-10-22 11:03:28 +100014#include <linux/highmem.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090015#include <linux/slab.h>
Rusty Russelld7e28ff2007-07-19 01:49:23 -070016#include <asm/paravirt.h>
Rusty Russelld7e28ff2007-07-19 01:49:23 -070017#include <asm/pgtable.h>
18#include <asm/uaccess.h>
19#include <asm/poll.h>
Rusty Russelld7e28ff2007-07-19 01:49:23 -070020#include <asm/asm-offsets.h>
Rusty Russelld7e28ff2007-07-19 01:49:23 -070021#include "lg.h"
22
Rusty Russell406a590b2013-04-22 14:10:37 +093023unsigned long switcher_addr;
Rusty Russelld7e28ff2007-07-19 01:49:23 -070024static struct vm_struct *switcher_vma;
25static struct page **switcher_page;
26
Rusty Russelld7e28ff2007-07-19 01:49:23 -070027/* This One Big lock protects all inter-guest data structures. */
28DEFINE_MUTEX(lguest_lock);
Rusty Russelld7e28ff2007-07-19 01:49:23 -070029
Rusty Russell2e04ef72009-07-30 16:03:45 -060030/*H:010
31 * We need to set up the Switcher at a high virtual address. Remember the
Rusty Russellbff672e2007-07-26 10:41:04 -070032 * Switcher is a few hundred bytes of assembler code which actually changes the
33 * CPU to run the Guest, and then changes back to the Host when a trap or
34 * interrupt happens.
35 *
36 * The Switcher code must be at the same virtual address in the Guest as the
37 * Host since it will be running as the switchover occurs.
38 *
39 * Trying to map memory at a particular address is an unusual thing to do, so
Rusty Russell2e04ef72009-07-30 16:03:45 -060040 * it's not a simple one-liner.
41 */
Rusty Russelld7e28ff2007-07-19 01:49:23 -070042static __init int map_switcher(void)
43{
44 int i, err;
45 struct page **pagep;
46
Rusty Russellbff672e2007-07-26 10:41:04 -070047 /*
48 * Map the Switcher in to high memory.
49 *
50 * It turns out that if we choose the address 0xFFC00000 (4MB under the
51 * top virtual address), it makes setting up the page tables really
52 * easy.
53 */
54
Rusty Russell2e04ef72009-07-30 16:03:45 -060055 /*
56 * We allocate an array of struct page pointers. map_vm_area() wants
57 * this, rather than just an array of pages.
58 */
Rusty Russelld7e28ff2007-07-19 01:49:23 -070059 switcher_page = kmalloc(sizeof(switcher_page[0])*TOTAL_SWITCHER_PAGES,
60 GFP_KERNEL);
61 if (!switcher_page) {
62 err = -ENOMEM;
63 goto out;
64 }
65
Rusty Russell2e04ef72009-07-30 16:03:45 -060066 /*
67 * Now we actually allocate the pages. The Guest will see these pages,
68 * so we make sure they're zeroed.
69 */
Rusty Russelld7e28ff2007-07-19 01:49:23 -070070 for (i = 0; i < TOTAL_SWITCHER_PAGES; i++) {
Xiao Guangrong6c189d82009-08-05 17:42:37 +080071 switcher_page[i] = alloc_page(GFP_KERNEL|__GFP_ZERO);
72 if (!switcher_page[i]) {
Rusty Russelld7e28ff2007-07-19 01:49:23 -070073 err = -ENOMEM;
74 goto free_some_pages;
75 }
Rusty Russelld7e28ff2007-07-19 01:49:23 -070076 }
77
Rusty Russell406a590b2013-04-22 14:10:37 +093078 switcher_addr = SWITCHER_ADDR;
79
Rusty Russell2e04ef72009-07-30 16:03:45 -060080 /*
81 * First we check that the Switcher won't overlap the fixmap area at
Rusty Russellf14ae652008-03-11 09:35:56 -050082 * the top of memory. It's currently nowhere near, but it could have
Rusty Russell2e04ef72009-07-30 16:03:45 -060083 * very strange effects if it ever happened.
84 */
Rusty Russell406a590b2013-04-22 14:10:37 +093085 if (switcher_addr + (TOTAL_SWITCHER_PAGES+1)*PAGE_SIZE > FIXADDR_START){
Rusty Russellf14ae652008-03-11 09:35:56 -050086 err = -ENOMEM;
87 printk("lguest: mapping switcher would thwack fixmap\n");
88 goto free_pages;
89 }
90
Rusty Russell2e04ef72009-07-30 16:03:45 -060091 /*
Rusty Russell406a590b2013-04-22 14:10:37 +093092 * Now we reserve the "virtual memory area" we want. We might
93 * not get it in theory, but in practice it's worked so far.
94 * The end address needs +1 because __get_vm_area allocates an
95 * extra guard page, so we need space for that.
Rusty Russell2e04ef72009-07-30 16:03:45 -060096 */
Rusty Russelld7e28ff2007-07-19 01:49:23 -070097 switcher_vma = __get_vm_area(TOTAL_SWITCHER_PAGES * PAGE_SIZE,
Rusty Russell406a590b2013-04-22 14:10:37 +093098 VM_ALLOC, switcher_addr, switcher_addr
Rusty Russellf14ae652008-03-11 09:35:56 -050099 + (TOTAL_SWITCHER_PAGES+1) * PAGE_SIZE);
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700100 if (!switcher_vma) {
101 err = -ENOMEM;
102 printk("lguest: could not map switcher pages high\n");
103 goto free_pages;
104 }
105
Rusty Russell2e04ef72009-07-30 16:03:45 -0600106 /*
107 * This code actually sets up the pages we've allocated to appear at
Rusty Russell406a590b2013-04-22 14:10:37 +0930108 * switcher_addr. map_vm_area() takes the vma we allocated above, the
Rusty Russellbff672e2007-07-26 10:41:04 -0700109 * kind of pages we're mapping (kernel pages), and a pointer to our
110 * array of struct pages. It increments that pointer, but we don't
Rusty Russell2e04ef72009-07-30 16:03:45 -0600111 * care.
112 */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700113 pagep = switcher_page;
Matias Zabaljaureguied1dc772009-05-30 15:35:49 -0300114 err = map_vm_area(switcher_vma, PAGE_KERNEL_EXEC, &pagep);
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700115 if (err) {
116 printk("lguest: map_vm_area failed: %i\n", err);
117 goto free_vma;
118 }
Rusty Russellbff672e2007-07-26 10:41:04 -0700119
Rusty Russell2e04ef72009-07-30 16:03:45 -0600120 /*
121 * Now the Switcher is mapped at the right address, we can't fail!
Rusty Russell9f542882011-07-22 14:39:50 +0930122 * Copy in the compiled-in Switcher code (from x86/switcher_32.S).
Rusty Russell2e04ef72009-07-30 16:03:45 -0600123 */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700124 memcpy(switcher_vma->addr, start_switcher_text,
125 end_switcher_text - start_switcher_text);
126
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700127 printk(KERN_INFO "lguest: mapped switcher at %p\n",
128 switcher_vma->addr);
Rusty Russellbff672e2007-07-26 10:41:04 -0700129 /* And we succeeded... */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700130 return 0;
131
132free_vma:
133 vunmap(switcher_vma->addr);
134free_pages:
135 i = TOTAL_SWITCHER_PAGES;
136free_some_pages:
137 for (--i; i >= 0; i--)
138 __free_pages(switcher_page[i], 0);
139 kfree(switcher_page);
140out:
141 return err;
142}
Rusty Russellbff672e2007-07-26 10:41:04 -0700143/*:*/
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700144
Rusty Russell2e04ef72009-07-30 16:03:45 -0600145/* Cleaning up the mapping when the module is unloaded is almost... too easy. */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700146static void unmap_switcher(void)
147{
148 unsigned int i;
149
Rusty Russellbff672e2007-07-26 10:41:04 -0700150 /* vunmap() undoes *both* map_vm_area() and __get_vm_area(). */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700151 vunmap(switcher_vma->addr);
Rusty Russellbff672e2007-07-26 10:41:04 -0700152 /* Now we just need to free the pages we copied the switcher into */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700153 for (i = 0; i < TOTAL_SWITCHER_PAGES; i++)
154 __free_pages(switcher_page[i], 0);
Johannes Weiner0a707212008-07-08 10:29:42 +0200155 kfree(switcher_page);
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700156}
157
Rusty Russelle1e72962007-10-25 15:02:50 +1000158/*H:032
Rusty Russelldde79782007-07-26 10:41:03 -0700159 * Dealing With Guest Memory.
160 *
Rusty Russelle1e72962007-10-25 15:02:50 +1000161 * Before we go too much further into the Host, we need to grok the routines
162 * we use to deal with Guest memory.
163 *
Rusty Russelldde79782007-07-26 10:41:03 -0700164 * When the Guest gives us (what it thinks is) a physical address, we can use
Rusty Russell3c6b5bf2007-10-22 11:03:26 +1000165 * the normal copy_from_user() & copy_to_user() on the corresponding place in
166 * the memory region allocated by the Launcher.
Rusty Russelldde79782007-07-26 10:41:03 -0700167 *
168 * But we can't trust the Guest: it might be trying to access the Launcher
169 * code. We have to check that the range is below the pfn_limit the Launcher
170 * gave us. We have to make sure that addr + len doesn't give us a false
Rusty Russell2e04ef72009-07-30 16:03:45 -0600171 * positive by overflowing, too.
172 */
Matias Zabaljaureguidf1693a2009-03-18 13:38:35 -0300173bool lguest_address_ok(const struct lguest *lg,
174 unsigned long addr, unsigned long len)
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700175{
176 return (addr+len) / PAGE_SIZE < lg->pfn_limit && (addr+len >= addr);
177}
178
Rusty Russell2e04ef72009-07-30 16:03:45 -0600179/*
180 * This routine copies memory from the Guest. Here we can see how useful the
Rusty Russell2d37f942007-10-22 11:24:24 +1000181 * kill_lguest() routine we met in the Launcher can be: we return a random
Rusty Russell2e04ef72009-07-30 16:03:45 -0600182 * value (all zeroes) instead of needing to return an error.
183 */
Glauber de Oliveira Costa382ac6b2008-01-17 19:19:42 -0200184void __lgread(struct lg_cpu *cpu, void *b, unsigned long addr, unsigned bytes)
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700185{
Glauber de Oliveira Costa382ac6b2008-01-17 19:19:42 -0200186 if (!lguest_address_ok(cpu->lg, addr, bytes)
187 || copy_from_user(b, cpu->lg->mem_base + addr, bytes) != 0) {
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700188 /* copy_from_user should do this, but as we rely on it... */
189 memset(b, 0, bytes);
Glauber de Oliveira Costa382ac6b2008-01-17 19:19:42 -0200190 kill_guest(cpu, "bad read address %#lx len %u", addr, bytes);
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700191 }
192}
193
Rusty Russella6bd8e12008-03-28 11:05:53 -0500194/* This is the write (copy into Guest) version. */
Glauber de Oliveira Costa382ac6b2008-01-17 19:19:42 -0200195void __lgwrite(struct lg_cpu *cpu, unsigned long addr, const void *b,
Rusty Russell2d37f942007-10-22 11:24:24 +1000196 unsigned bytes)
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700197{
Glauber de Oliveira Costa382ac6b2008-01-17 19:19:42 -0200198 if (!lguest_address_ok(cpu->lg, addr, bytes)
199 || copy_to_user(cpu->lg->mem_base + addr, b, bytes) != 0)
200 kill_guest(cpu, "bad write address %#lx len %u", addr, bytes);
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700201}
Rusty Russell2d37f942007-10-22 11:24:24 +1000202/*:*/
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700203
Rusty Russell2e04ef72009-07-30 16:03:45 -0600204/*H:030
205 * Let's jump straight to the the main loop which runs the Guest.
Rusty Russellbff672e2007-07-26 10:41:04 -0700206 * Remember, this is called by the Launcher reading /dev/lguest, and we keep
Rusty Russell2e04ef72009-07-30 16:03:45 -0600207 * going around and around until something interesting happens.
208 */
Glauber de Oliveira Costad0953d42008-01-07 11:05:25 -0200209int run_guest(struct lg_cpu *cpu, unsigned long __user *user)
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700210{
Rusty Russellbff672e2007-07-26 10:41:04 -0700211 /* We stop running once the Guest is dead. */
Glauber de Oliveira Costa382ac6b2008-01-17 19:19:42 -0200212 while (!cpu->lg->dead) {
Rusty Russellabd41f02009-06-12 22:27:02 -0600213 unsigned int irq;
Rusty Russella32a88132009-06-12 22:27:02 -0600214 bool more;
Rusty Russellabd41f02009-06-12 22:27:02 -0600215
Rusty Russellcc6d4fb2007-10-22 11:03:30 +1000216 /* First we run any hypercalls the Guest wants done. */
Glauber de Oliveira Costa73044f02008-01-07 11:05:27 -0200217 if (cpu->hcall)
218 do_hypercalls(cpu);
Rusty Russellcc6d4fb2007-10-22 11:03:30 +1000219
Rusty Russell2e04ef72009-07-30 16:03:45 -0600220 /*
221 * It's possible the Guest did a NOTIFY hypercall to the
Rusty Russella91d74a2009-07-30 16:03:45 -0600222 * Launcher.
Rusty Russell2e04ef72009-07-30 16:03:45 -0600223 */
Glauber de Oliveira Costa5e232f42008-01-07 11:05:36 -0200224 if (cpu->pending_notify) {
Rusty Russella91d74a2009-07-30 16:03:45 -0600225 /*
226 * Does it just needs to write to a registered
227 * eventfd (ie. the appropriate virtqueue thread)?
228 */
Rusty Russelldf60aee2009-06-12 22:27:09 -0600229 if (!send_notify_to_eventfd(cpu)) {
Alex Russell681f2062012-10-16 23:56:13 +1030230 /* OK, we tell the main Launcher. */
Rusty Russelldf60aee2009-06-12 22:27:09 -0600231 if (put_user(cpu->pending_notify, user))
232 return -EFAULT;
233 return sizeof(cpu->pending_notify);
234 }
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700235 }
236
Michal Hocko0acf0002011-09-27 08:56:03 +0200237 /*
238 * All long-lived kernel loops need to check with this horrible
239 * thing called the freezer. If the Host is trying to suspend,
240 * it stops us.
241 */
242 try_to_freeze();
243
Rusty Russellbff672e2007-07-26 10:41:04 -0700244 /* Check for signals */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700245 if (signal_pending(current))
246 return -ERESTARTSYS;
247
Rusty Russell2e04ef72009-07-30 16:03:45 -0600248 /*
249 * Check if there are any interrupts which can be delivered now:
Rusty Russella6bd8e12008-03-28 11:05:53 -0500250 * if so, this sets up the hander to be executed when we next
Rusty Russell2e04ef72009-07-30 16:03:45 -0600251 * run the Guest.
252 */
Rusty Russella32a88132009-06-12 22:27:02 -0600253 irq = interrupt_pending(cpu, &more);
Rusty Russellabd41f02009-06-12 22:27:02 -0600254 if (irq < LGUEST_IRQS)
Rusty Russella32a88132009-06-12 22:27:02 -0600255 try_deliver_interrupt(cpu, irq, more);
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700256
Rusty Russell2e04ef72009-07-30 16:03:45 -0600257 /*
Rusty Russell2e04ef72009-07-30 16:03:45 -0600258 * Just make absolutely sure the Guest is still alive. One of
259 * those hypercalls could have been fatal, for example.
260 */
Glauber de Oliveira Costa382ac6b2008-01-17 19:19:42 -0200261 if (cpu->lg->dead)
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700262 break;
263
Rusty Russell2e04ef72009-07-30 16:03:45 -0600264 /*
265 * If the Guest asked to be stopped, we sleep. The Guest's
266 * clock timer will wake us.
267 */
Glauber de Oliveira Costa66686c22008-01-07 11:05:34 -0200268 if (cpu->halted) {
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700269 set_current_state(TASK_INTERRUPTIBLE);
Rusty Russell2e04ef72009-07-30 16:03:45 -0600270 /*
271 * Just before we sleep, make sure no interrupt snuck in
272 * which we should be doing.
273 */
Rusty Russell5dac0512009-06-12 22:27:10 -0600274 if (interrupt_pending(cpu, &more) < LGUEST_IRQS)
Rusty Russellabd41f02009-06-12 22:27:02 -0600275 set_current_state(TASK_RUNNING);
276 else
277 schedule();
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700278 continue;
279 }
280
Rusty Russell2e04ef72009-07-30 16:03:45 -0600281 /*
282 * OK, now we're ready to jump into the Guest. First we put up
283 * the "Do Not Disturb" sign:
284 */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700285 local_irq_disable();
286
Jes Sorensen625efab2007-10-22 11:03:28 +1000287 /* Actually run the Guest until something happens. */
Glauber de Oliveira Costad0953d42008-01-07 11:05:25 -0200288 lguest_arch_run_guest(cpu);
Rusty Russellbff672e2007-07-26 10:41:04 -0700289
290 /* Now we're ready to be interrupted or moved to other CPUs */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700291 local_irq_enable();
292
Jes Sorensen625efab2007-10-22 11:03:28 +1000293 /* Now we deal with whatever happened to the Guest. */
Glauber de Oliveira Costa73044f02008-01-07 11:05:27 -0200294 lguest_arch_handle_trap(cpu);
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700295 }
Jes Sorensen625efab2007-10-22 11:03:28 +1000296
Rusty Russella6bd8e12008-03-28 11:05:53 -0500297 /* Special case: Guest is 'dead' but wants a reboot. */
Glauber de Oliveira Costa382ac6b2008-01-17 19:19:42 -0200298 if (cpu->lg->dead == ERR_PTR(-ERESTART))
Balaji Raoec04b132007-12-28 14:26:24 +0530299 return -ERESTART;
Rusty Russella6bd8e12008-03-28 11:05:53 -0500300
Rusty Russellbff672e2007-07-26 10:41:04 -0700301 /* The Guest is dead => "No such file or directory" */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700302 return -ENOENT;
303}
304
Rusty Russellbff672e2007-07-26 10:41:04 -0700305/*H:000
306 * Welcome to the Host!
307 *
308 * By this point your brain has been tickled by the Guest code and numbed by
309 * the Launcher code; prepare for it to be stretched by the Host code. This is
310 * the heart. Let's begin at the initialization routine for the Host's lg
311 * module.
312 */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700313static int __init init(void)
314{
315 int err;
316
Rusty Russellbff672e2007-07-26 10:41:04 -0700317 /* Lguest can't run under Xen, VMI or itself. It does Tricky Stuff. */
Rusty Russellb56e3212011-10-27 10:56:17 +1030318 if (get_kernel_rpl() != 0) {
Glauber de Oliveira Costa5c558412008-01-17 22:32:50 -0200319 printk("lguest is afraid of being a guest\n");
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700320 return -EPERM;
321 }
322
Rusty Russellbff672e2007-07-26 10:41:04 -0700323 /* First we put the Switcher up in very high virtual memory. */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700324 err = map_switcher();
325 if (err)
Rusty Russellc18acd72007-10-22 11:03:35 +1000326 goto out;
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700327
Rusty Russellbff672e2007-07-26 10:41:04 -0700328 /* Now we set up the pagetable implementation for the Guests. */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700329 err = init_pagetables(switcher_page, SHARED_SWITCHER_PAGES);
Rusty Russellc18acd72007-10-22 11:03:35 +1000330 if (err)
331 goto unmap;
Rusty Russellbff672e2007-07-26 10:41:04 -0700332
Rusty Russellc18acd72007-10-22 11:03:35 +1000333 /* We might need to reserve an interrupt vector. */
334 err = init_interrupts();
335 if (err)
336 goto free_pgtables;
337
Rusty Russellbff672e2007-07-26 10:41:04 -0700338 /* /dev/lguest needs to be registered. */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700339 err = lguest_device_init();
Rusty Russellc18acd72007-10-22 11:03:35 +1000340 if (err)
341 goto free_interrupts;
Rusty Russellbff672e2007-07-26 10:41:04 -0700342
Jes Sorensen625efab2007-10-22 11:03:28 +1000343 /* Finally we do some architecture-specific setup. */
344 lguest_arch_host_init();
Rusty Russellbff672e2007-07-26 10:41:04 -0700345
346 /* All good! */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700347 return 0;
Rusty Russellc18acd72007-10-22 11:03:35 +1000348
349free_interrupts:
350 free_interrupts();
351free_pgtables:
352 free_pagetables();
353unmap:
354 unmap_switcher();
355out:
356 return err;
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700357}
358
Rusty Russellbff672e2007-07-26 10:41:04 -0700359/* Cleaning up is just the same code, backwards. With a little French. */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700360static void __exit fini(void)
361{
362 lguest_device_remove();
Rusty Russellc18acd72007-10-22 11:03:35 +1000363 free_interrupts();
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700364 free_pagetables();
365 unmap_switcher();
Rusty Russellbff672e2007-07-26 10:41:04 -0700366
Jes Sorensen625efab2007-10-22 11:03:28 +1000367 lguest_arch_host_fini();
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700368}
Jes Sorensen625efab2007-10-22 11:03:28 +1000369/*:*/
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700370
Rusty Russell2e04ef72009-07-30 16:03:45 -0600371/*
372 * The Host side of lguest can be a module. This is a nice way for people to
373 * play with it.
374 */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700375module_init(init);
376module_exit(fini);
377MODULE_LICENSE("GPL");
378MODULE_AUTHOR("Rusty Russell <rusty@rustcorp.com.au>");