Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Core of Xen paravirt_ops implementation. |
| 3 | * |
| 4 | * This file contains the xen_paravirt_ops structure itself, and the |
| 5 | * implementations for: |
| 6 | * - privileged instructions |
| 7 | * - interrupt flags |
| 8 | * - segment operations |
| 9 | * - booting and setup |
| 10 | * |
| 11 | * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007 |
| 12 | */ |
| 13 | |
| 14 | #include <linux/kernel.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/smp.h> |
| 17 | #include <linux/preempt.h> |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 18 | #include <linux/hardirq.h> |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 19 | #include <linux/percpu.h> |
| 20 | #include <linux/delay.h> |
| 21 | #include <linux/start_kernel.h> |
| 22 | #include <linux/sched.h> |
| 23 | #include <linux/bootmem.h> |
| 24 | #include <linux/module.h> |
Jeremy Fitzhardinge | f4f97b3 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 25 | #include <linux/mm.h> |
| 26 | #include <linux/page-flags.h> |
| 27 | #include <linux/highmem.h> |
Markus Armbruster | b8c2d3d | 2008-02-27 14:56:35 +0100 | [diff] [blame] | 28 | #include <linux/console.h> |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 29 | |
| 30 | #include <xen/interface/xen.h> |
| 31 | #include <xen/interface/physdev.h> |
| 32 | #include <xen/interface/vcpu.h> |
Jeremy Fitzhardinge | fefa629 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 33 | #include <xen/interface/sched.h> |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 34 | #include <xen/features.h> |
| 35 | #include <xen/page.h> |
| 36 | |
| 37 | #include <asm/paravirt.h> |
| 38 | #include <asm/page.h> |
| 39 | #include <asm/xen/hypercall.h> |
| 40 | #include <asm/xen/hypervisor.h> |
| 41 | #include <asm/fixmap.h> |
| 42 | #include <asm/processor.h> |
| 43 | #include <asm/setup.h> |
| 44 | #include <asm/desc.h> |
| 45 | #include <asm/pgtable.h> |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 46 | #include <asm/tlbflush.h> |
Jeremy Fitzhardinge | fefa629 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 47 | #include <asm/reboot.h> |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 48 | |
| 49 | #include "xen-ops.h" |
Jeremy Fitzhardinge | 3b827c1 | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 50 | #include "mmu.h" |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 51 | #include "multicalls.h" |
| 52 | |
| 53 | EXPORT_SYMBOL_GPL(hypercall_page); |
| 54 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 55 | DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu); |
| 56 | DEFINE_PER_CPU(struct vcpu_info, xen_vcpu_info); |
Jeremy Fitzhardinge | 9f79991 | 2007-10-16 11:51:30 -0700 | [diff] [blame] | 57 | |
| 58 | /* |
| 59 | * Note about cr3 (pagetable base) values: |
| 60 | * |
| 61 | * xen_cr3 contains the current logical cr3 value; it contains the |
| 62 | * last set cr3. This may not be the current effective cr3, because |
| 63 | * its update may be being lazily deferred. However, a vcpu looking |
| 64 | * at its own cr3 can use this value knowing that it everything will |
| 65 | * be self-consistent. |
| 66 | * |
| 67 | * xen_current_cr3 contains the actual vcpu cr3; it is set once the |
| 68 | * hypercall to set the vcpu cr3 is complete (so it may be a little |
| 69 | * out of date, but it will never be set early). If one vcpu is |
| 70 | * looking at another vcpu's cr3 value, it should use this variable. |
| 71 | */ |
| 72 | DEFINE_PER_CPU(unsigned long, xen_cr3); /* cr3 stored as physaddr */ |
| 73 | DEFINE_PER_CPU(unsigned long, xen_current_cr3); /* actual vcpu cr3 */ |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 74 | |
| 75 | struct start_info *xen_start_info; |
| 76 | EXPORT_SYMBOL_GPL(xen_start_info); |
| 77 | |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 78 | static /* __initdata */ struct shared_info dummy_shared_info; |
| 79 | |
| 80 | /* |
| 81 | * Point at some empty memory to start with. We map the real shared_info |
| 82 | * page as soon as fixmap is up and running. |
| 83 | */ |
| 84 | struct shared_info *HYPERVISOR_shared_info = (void *)&dummy_shared_info; |
| 85 | |
| 86 | /* |
| 87 | * Flag to determine whether vcpu info placement is available on all |
| 88 | * VCPUs. We assume it is to start with, and then set it to zero on |
| 89 | * the first failure. This is because it can succeed on some VCPUs |
| 90 | * and not others, since it can involve hypervisor memory allocation, |
| 91 | * or because the guest failed to guarantee all the appropriate |
| 92 | * constraints on all VCPUs (ie buffer can't cross a page boundary). |
| 93 | * |
| 94 | * Note that any particular CPU may be using a placed vcpu structure, |
| 95 | * but we can only optimise if the all are. |
| 96 | * |
| 97 | * 0: not available, 1: available |
| 98 | */ |
Jeremy Fitzhardinge | 04c44a0 | 2008-03-17 16:36:52 -0700 | [diff] [blame] | 99 | static int have_vcpu_info_placement = 1; |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 100 | |
| 101 | static void __init xen_vcpu_setup(int cpu) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 102 | { |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 103 | struct vcpu_register_vcpu_info info; |
| 104 | int err; |
| 105 | struct vcpu_info *vcpup; |
| 106 | |
Jeremy Fitzhardinge | 2e8fe71 | 2008-03-17 16:36:53 -0700 | [diff] [blame] | 107 | BUG_ON(HYPERVISOR_shared_info == &dummy_shared_info); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 108 | per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu]; |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 109 | |
| 110 | if (!have_vcpu_info_placement) |
| 111 | return; /* already tested, not available */ |
| 112 | |
| 113 | vcpup = &per_cpu(xen_vcpu_info, cpu); |
| 114 | |
| 115 | info.mfn = virt_to_mfn(vcpup); |
| 116 | info.offset = offset_in_page(vcpup); |
| 117 | |
Jeremy Fitzhardinge | e3d2697 | 2007-10-16 11:51:31 -0700 | [diff] [blame] | 118 | printk(KERN_DEBUG "trying to map vcpu_info %d at %p, mfn %llx, offset %d\n", |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 119 | cpu, vcpup, info.mfn, info.offset); |
| 120 | |
| 121 | /* Check to see if the hypervisor will put the vcpu_info |
| 122 | structure where we want it, which allows direct access via |
| 123 | a percpu-variable. */ |
| 124 | err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info); |
| 125 | |
| 126 | if (err) { |
| 127 | printk(KERN_DEBUG "register_vcpu_info failed: err=%d\n", err); |
| 128 | have_vcpu_info_placement = 0; |
| 129 | } else { |
| 130 | /* This cpu is using the registered vcpu info, even if |
| 131 | later ones fail to. */ |
| 132 | per_cpu(xen_vcpu, cpu) = vcpup; |
Jeremy Fitzhardinge | 6487673 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 133 | |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 134 | printk(KERN_DEBUG "cpu %d using vcpu_info at %p\n", |
| 135 | cpu, vcpup); |
| 136 | } |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 137 | } |
| 138 | |
| 139 | static void __init xen_banner(void) |
| 140 | { |
| 141 | printk(KERN_INFO "Booting paravirtualized kernel on %s\n", |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 142 | pv_info.name); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 143 | printk(KERN_INFO "Hypervisor signature: %s\n", xen_start_info->magic); |
| 144 | } |
| 145 | |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 146 | static void xen_cpuid(unsigned int *ax, unsigned int *bx, |
| 147 | unsigned int *cx, unsigned int *dx) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 148 | { |
| 149 | unsigned maskedx = ~0; |
| 150 | |
| 151 | /* |
| 152 | * Mask out inconvenient features, to try and disable as many |
| 153 | * unsupported kernel subsystems as possible. |
| 154 | */ |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 155 | if (*ax == 1) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 156 | maskedx = ~((1 << X86_FEATURE_APIC) | /* disable APIC */ |
| 157 | (1 << X86_FEATURE_ACPI) | /* disable ACPI */ |
Jeremy Fitzhardinge | dbe9e99 | 2008-03-17 16:37:21 -0700 | [diff] [blame] | 158 | (1 << X86_FEATURE_MCE) | /* disable MCE */ |
| 159 | (1 << X86_FEATURE_MCA) | /* disable MCA */ |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 160 | (1 << X86_FEATURE_ACC)); /* thermal monitoring */ |
| 161 | |
| 162 | asm(XEN_EMULATE_PREFIX "cpuid" |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 163 | : "=a" (*ax), |
| 164 | "=b" (*bx), |
| 165 | "=c" (*cx), |
| 166 | "=d" (*dx) |
| 167 | : "0" (*ax), "2" (*cx)); |
| 168 | *dx &= maskedx; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 169 | } |
| 170 | |
| 171 | static void xen_set_debugreg(int reg, unsigned long val) |
| 172 | { |
| 173 | HYPERVISOR_set_debugreg(reg, val); |
| 174 | } |
| 175 | |
| 176 | static unsigned long xen_get_debugreg(int reg) |
| 177 | { |
| 178 | return HYPERVISOR_get_debugreg(reg); |
| 179 | } |
| 180 | |
| 181 | static unsigned long xen_save_fl(void) |
| 182 | { |
| 183 | struct vcpu_info *vcpu; |
| 184 | unsigned long flags; |
| 185 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 186 | vcpu = x86_read_percpu(xen_vcpu); |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 187 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 188 | /* flag has opposite sense of mask */ |
| 189 | flags = !vcpu->evtchn_upcall_mask; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 190 | |
| 191 | /* convert to IF type flag |
| 192 | -0 -> 0x00000000 |
| 193 | -1 -> 0xffffffff |
| 194 | */ |
| 195 | return (-flags) & X86_EFLAGS_IF; |
| 196 | } |
| 197 | |
| 198 | static void xen_restore_fl(unsigned long flags) |
| 199 | { |
| 200 | struct vcpu_info *vcpu; |
| 201 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 202 | /* convert from IF type flag */ |
| 203 | flags = !(flags & X86_EFLAGS_IF); |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 204 | |
| 205 | /* There's a one instruction preempt window here. We need to |
| 206 | make sure we're don't switch CPUs between getting the vcpu |
| 207 | pointer and updating the mask. */ |
| 208 | preempt_disable(); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 209 | vcpu = x86_read_percpu(xen_vcpu); |
| 210 | vcpu->evtchn_upcall_mask = flags; |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 211 | preempt_enable_no_resched(); |
| 212 | |
| 213 | /* Doesn't matter if we get preempted here, because any |
| 214 | pending event will get dealt with anyway. */ |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 215 | |
| 216 | if (flags == 0) { |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 217 | preempt_check_resched(); |
| 218 | barrier(); /* unmask then check (avoid races) */ |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 219 | if (unlikely(vcpu->evtchn_upcall_pending)) |
| 220 | force_evtchn_callback(); |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 221 | } |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 222 | } |
| 223 | |
| 224 | static void xen_irq_disable(void) |
| 225 | { |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 226 | /* There's a one instruction preempt window here. We need to |
| 227 | make sure we're don't switch CPUs between getting the vcpu |
| 228 | pointer and updating the mask. */ |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 229 | preempt_disable(); |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 230 | x86_read_percpu(xen_vcpu)->evtchn_upcall_mask = 1; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 231 | preempt_enable_no_resched(); |
| 232 | } |
| 233 | |
| 234 | static void xen_irq_enable(void) |
| 235 | { |
| 236 | struct vcpu_info *vcpu; |
| 237 | |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 238 | /* There's a one instruction preempt window here. We need to |
| 239 | make sure we're don't switch CPUs between getting the vcpu |
| 240 | pointer and updating the mask. */ |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 241 | preempt_disable(); |
| 242 | vcpu = x86_read_percpu(xen_vcpu); |
| 243 | vcpu->evtchn_upcall_mask = 0; |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 244 | preempt_enable_no_resched(); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 245 | |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 246 | /* Doesn't matter if we get preempted here, because any |
| 247 | pending event will get dealt with anyway. */ |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 248 | |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 249 | barrier(); /* unmask then check (avoid races) */ |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 250 | if (unlikely(vcpu->evtchn_upcall_pending)) |
| 251 | force_evtchn_callback(); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 252 | } |
| 253 | |
| 254 | static void xen_safe_halt(void) |
| 255 | { |
| 256 | /* Blocking includes an implicit local_irq_enable(). */ |
| 257 | if (HYPERVISOR_sched_op(SCHEDOP_block, 0) != 0) |
| 258 | BUG(); |
| 259 | } |
| 260 | |
| 261 | static void xen_halt(void) |
| 262 | { |
| 263 | if (irqs_disabled()) |
| 264 | HYPERVISOR_vcpu_op(VCPUOP_down, smp_processor_id(), NULL); |
| 265 | else |
| 266 | xen_safe_halt(); |
| 267 | } |
| 268 | |
Jeremy Fitzhardinge | 8965c1c | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 269 | static void xen_leave_lazy(void) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 270 | { |
Jeremy Fitzhardinge | 8965c1c | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 271 | paravirt_leave_lazy(paravirt_get_lazy_mode()); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 272 | xen_mc_flush(); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 273 | } |
| 274 | |
| 275 | static unsigned long xen_store_tr(void) |
| 276 | { |
| 277 | return 0; |
| 278 | } |
| 279 | |
| 280 | static void xen_set_ldt(const void *addr, unsigned entries) |
| 281 | { |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 282 | struct mmuext_op *op; |
| 283 | struct multicall_space mcs = xen_mc_entry(sizeof(*op)); |
| 284 | |
| 285 | op = mcs.args; |
| 286 | op->cmd = MMUEXT_SET_LDT; |
Jan Beulich | 4dbf7af | 2008-01-30 13:33:14 +0100 | [diff] [blame] | 287 | op->arg1.linear_addr = (unsigned long)addr; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 288 | op->arg2.nr_ents = entries; |
| 289 | |
| 290 | MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF); |
| 291 | |
| 292 | xen_mc_issue(PARAVIRT_LAZY_CPU); |
| 293 | } |
| 294 | |
Glauber de Oliveira Costa | 6b68f01 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 295 | static void xen_load_gdt(const struct desc_ptr *dtr) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 296 | { |
| 297 | unsigned long *frames; |
| 298 | unsigned long va = dtr->address; |
| 299 | unsigned int size = dtr->size + 1; |
| 300 | unsigned pages = (size + PAGE_SIZE - 1) / PAGE_SIZE; |
| 301 | int f; |
| 302 | struct multicall_space mcs; |
| 303 | |
| 304 | /* A GDT can be up to 64k in size, which corresponds to 8192 |
| 305 | 8-byte entries, or 16 4k pages.. */ |
| 306 | |
| 307 | BUG_ON(size > 65536); |
| 308 | BUG_ON(va & ~PAGE_MASK); |
| 309 | |
| 310 | mcs = xen_mc_entry(sizeof(*frames) * pages); |
| 311 | frames = mcs.args; |
| 312 | |
| 313 | for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) { |
| 314 | frames[f] = virt_to_mfn(va); |
| 315 | make_lowmem_page_readonly((void *)va); |
| 316 | } |
| 317 | |
| 318 | MULTI_set_gdt(mcs.mc, frames, size / sizeof(struct desc_struct)); |
| 319 | |
| 320 | xen_mc_issue(PARAVIRT_LAZY_CPU); |
| 321 | } |
| 322 | |
| 323 | static void load_TLS_descriptor(struct thread_struct *t, |
| 324 | unsigned int cpu, unsigned int i) |
| 325 | { |
| 326 | struct desc_struct *gdt = get_cpu_gdt_table(cpu); |
| 327 | xmaddr_t maddr = virt_to_machine(&gdt[GDT_ENTRY_TLS_MIN+i]); |
| 328 | struct multicall_space mc = __xen_mc_entry(0); |
| 329 | |
| 330 | MULTI_update_descriptor(mc.mc, maddr.maddr, t->tls_array[i]); |
| 331 | } |
| 332 | |
| 333 | static void xen_load_tls(struct thread_struct *t, unsigned int cpu) |
| 334 | { |
| 335 | xen_mc_batch(); |
| 336 | |
| 337 | load_TLS_descriptor(t, cpu, 0); |
| 338 | load_TLS_descriptor(t, cpu, 1); |
| 339 | load_TLS_descriptor(t, cpu, 2); |
| 340 | |
| 341 | xen_mc_issue(PARAVIRT_LAZY_CPU); |
Jeremy Fitzhardinge | 8b84ad9 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 342 | |
| 343 | /* |
| 344 | * XXX sleazy hack: If we're being called in a lazy-cpu zone, |
| 345 | * it means we're in a context switch, and %gs has just been |
| 346 | * saved. This means we can zero it out to prevent faults on |
| 347 | * exit from the hypervisor if the next process has no %gs. |
| 348 | * Either way, it has been saved, and the new value will get |
| 349 | * loaded properly. This will go away as soon as Xen has been |
| 350 | * modified to not save/restore %gs for normal hypercalls. |
| 351 | */ |
Jeremy Fitzhardinge | 8965c1c | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 352 | if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_CPU) |
Jeremy Fitzhardinge | 8b84ad9 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 353 | loadsegment(gs, 0); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 354 | } |
| 355 | |
| 356 | static void xen_write_ldt_entry(struct desc_struct *dt, int entrynum, |
Glauber de Oliveira Costa | 75b8bb3 | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 357 | const void *ptr) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 358 | { |
| 359 | unsigned long lp = (unsigned long)&dt[entrynum]; |
| 360 | xmaddr_t mach_lp = virt_to_machine(lp); |
Glauber de Oliveira Costa | 75b8bb3 | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 361 | u64 entry = *(u64 *)ptr; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 362 | |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 363 | preempt_disable(); |
| 364 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 365 | xen_mc_flush(); |
| 366 | if (HYPERVISOR_update_descriptor(mach_lp.maddr, entry)) |
| 367 | BUG(); |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 368 | |
| 369 | preempt_enable(); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 370 | } |
| 371 | |
| 372 | static int cvt_gate_to_trap(int vector, u32 low, u32 high, |
| 373 | struct trap_info *info) |
| 374 | { |
| 375 | u8 type, dpl; |
| 376 | |
| 377 | type = (high >> 8) & 0x1f; |
| 378 | dpl = (high >> 13) & 3; |
| 379 | |
| 380 | if (type != 0xf && type != 0xe) |
| 381 | return 0; |
| 382 | |
| 383 | info->vector = vector; |
| 384 | info->address = (high & 0xffff0000) | (low & 0x0000ffff); |
| 385 | info->cs = low >> 16; |
| 386 | info->flags = dpl; |
| 387 | /* interrupt gates clear IF */ |
| 388 | if (type == 0xe) |
| 389 | info->flags |= 4; |
| 390 | |
| 391 | return 1; |
| 392 | } |
| 393 | |
| 394 | /* Locations of each CPU's IDT */ |
Glauber de Oliveira Costa | 6b68f01 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 395 | static DEFINE_PER_CPU(struct desc_ptr, idt_desc); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 396 | |
| 397 | /* Set an IDT entry. If the entry is part of the current IDT, then |
| 398 | also update Xen. */ |
Glauber de Oliveira Costa | 8d94734 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 399 | static void xen_write_idt_entry(gate_desc *dt, int entrynum, const gate_desc *g) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 400 | { |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 401 | unsigned long p = (unsigned long)&dt[entrynum]; |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 402 | unsigned long start, end; |
| 403 | |
| 404 | preempt_disable(); |
| 405 | |
| 406 | start = __get_cpu_var(idt_desc).address; |
| 407 | end = start + __get_cpu_var(idt_desc).size + 1; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 408 | |
| 409 | xen_mc_flush(); |
| 410 | |
Glauber de Oliveira Costa | 8d94734 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 411 | native_write_idt_entry(dt, entrynum, g); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 412 | |
| 413 | if (p >= start && (p + 8) <= end) { |
| 414 | struct trap_info info[2]; |
Glauber de Oliveira Costa | 8d94734 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 415 | u32 *desc = (u32 *)g; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 416 | |
| 417 | info[1].address = 0; |
| 418 | |
Glauber de Oliveira Costa | 8d94734 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 419 | if (cvt_gate_to_trap(entrynum, desc[0], desc[1], &info[0])) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 420 | if (HYPERVISOR_set_trap_table(info)) |
| 421 | BUG(); |
| 422 | } |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 423 | |
| 424 | preempt_enable(); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 425 | } |
| 426 | |
Glauber de Oliveira Costa | 6b68f01 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 427 | static void xen_convert_trap_info(const struct desc_ptr *desc, |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 428 | struct trap_info *traps) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 429 | { |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 430 | unsigned in, out, count; |
| 431 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 432 | count = (desc->size+1) / 8; |
| 433 | BUG_ON(count > 256); |
| 434 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 435 | for (in = out = 0; in < count; in++) { |
| 436 | const u32 *entry = (u32 *)(desc->address + in * 8); |
| 437 | |
| 438 | if (cvt_gate_to_trap(in, entry[0], entry[1], &traps[out])) |
| 439 | out++; |
| 440 | } |
| 441 | traps[out].address = 0; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 442 | } |
| 443 | |
| 444 | void xen_copy_trap_info(struct trap_info *traps) |
| 445 | { |
Glauber de Oliveira Costa | 6b68f01 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 446 | const struct desc_ptr *desc = &__get_cpu_var(idt_desc); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 447 | |
| 448 | xen_convert_trap_info(desc, traps); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 449 | } |
| 450 | |
| 451 | /* Load a new IDT into Xen. In principle this can be per-CPU, so we |
| 452 | hold a spinlock to protect the static traps[] array (static because |
| 453 | it avoids allocation, and saves stack space). */ |
Glauber de Oliveira Costa | 6b68f01 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 454 | static void xen_load_idt(const struct desc_ptr *desc) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 455 | { |
| 456 | static DEFINE_SPINLOCK(lock); |
| 457 | static struct trap_info traps[257]; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 458 | |
| 459 | spin_lock(&lock); |
| 460 | |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 461 | __get_cpu_var(idt_desc) = *desc; |
| 462 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 463 | xen_convert_trap_info(desc, traps); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 464 | |
| 465 | xen_mc_flush(); |
| 466 | if (HYPERVISOR_set_trap_table(traps)) |
| 467 | BUG(); |
| 468 | |
| 469 | spin_unlock(&lock); |
| 470 | } |
| 471 | |
| 472 | /* Write a GDT descriptor entry. Ignore LDT descriptors, since |
| 473 | they're handled differently. */ |
| 474 | static void xen_write_gdt_entry(struct desc_struct *dt, int entry, |
Glauber de Oliveira Costa | 014b15b | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 475 | const void *desc, int type) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 476 | { |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 477 | preempt_disable(); |
| 478 | |
Glauber de Oliveira Costa | 014b15b | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 479 | switch (type) { |
| 480 | case DESC_LDT: |
| 481 | case DESC_TSS: |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 482 | /* ignore */ |
| 483 | break; |
| 484 | |
| 485 | default: { |
| 486 | xmaddr_t maddr = virt_to_machine(&dt[entry]); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 487 | |
| 488 | xen_mc_flush(); |
Glauber de Oliveira Costa | 014b15b | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 489 | if (HYPERVISOR_update_descriptor(maddr.maddr, *(u64 *)desc)) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 490 | BUG(); |
| 491 | } |
| 492 | |
| 493 | } |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 494 | |
| 495 | preempt_enable(); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 496 | } |
| 497 | |
H. Peter Anvin | faca622 | 2008-01-30 13:31:02 +0100 | [diff] [blame] | 498 | static void xen_load_sp0(struct tss_struct *tss, |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 499 | struct thread_struct *thread) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 500 | { |
| 501 | struct multicall_space mcs = xen_mc_entry(0); |
H. Peter Anvin | faca622 | 2008-01-30 13:31:02 +0100 | [diff] [blame] | 502 | MULTI_stack_switch(mcs.mc, __KERNEL_DS, thread->sp0); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 503 | xen_mc_issue(PARAVIRT_LAZY_CPU); |
| 504 | } |
| 505 | |
| 506 | static void xen_set_iopl_mask(unsigned mask) |
| 507 | { |
| 508 | struct physdev_set_iopl set_iopl; |
| 509 | |
| 510 | /* Force the change at ring 0. */ |
| 511 | set_iopl.iopl = (mask == 0) ? 1 : (mask >> 12) & 3; |
| 512 | HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl); |
| 513 | } |
| 514 | |
| 515 | static void xen_io_delay(void) |
| 516 | { |
| 517 | } |
| 518 | |
| 519 | #ifdef CONFIG_X86_LOCAL_APIC |
Thomas Gleixner | 42e0a9aa | 2008-01-30 13:30:15 +0100 | [diff] [blame] | 520 | static u32 xen_apic_read(unsigned long reg) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 521 | { |
| 522 | return 0; |
| 523 | } |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 524 | |
Thomas Gleixner | 42e0a9aa | 2008-01-30 13:30:15 +0100 | [diff] [blame] | 525 | static void xen_apic_write(unsigned long reg, u32 val) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 526 | { |
| 527 | /* Warn to see if there's any stray references */ |
| 528 | WARN_ON(1); |
| 529 | } |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 530 | #endif |
| 531 | |
| 532 | static void xen_flush_tlb(void) |
| 533 | { |
Jeremy Fitzhardinge | d66bf8f | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 534 | struct mmuext_op *op; |
Jeremy Fitzhardinge | 41e332b | 2008-04-02 10:54:09 -0700 | [diff] [blame] | 535 | struct multicall_space mcs; |
| 536 | |
| 537 | preempt_disable(); |
| 538 | |
| 539 | mcs = xen_mc_entry(sizeof(*op)); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 540 | |
Jeremy Fitzhardinge | d66bf8f | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 541 | op = mcs.args; |
| 542 | op->cmd = MMUEXT_TLB_FLUSH_LOCAL; |
| 543 | MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF); |
| 544 | |
| 545 | xen_mc_issue(PARAVIRT_LAZY_MMU); |
Jeremy Fitzhardinge | 41e332b | 2008-04-02 10:54:09 -0700 | [diff] [blame] | 546 | |
| 547 | preempt_enable(); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 548 | } |
| 549 | |
| 550 | static void xen_flush_tlb_single(unsigned long addr) |
| 551 | { |
Jeremy Fitzhardinge | d66bf8f | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 552 | struct mmuext_op *op; |
Jeremy Fitzhardinge | 41e332b | 2008-04-02 10:54:09 -0700 | [diff] [blame] | 553 | struct multicall_space mcs; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 554 | |
Jeremy Fitzhardinge | 41e332b | 2008-04-02 10:54:09 -0700 | [diff] [blame] | 555 | preempt_disable(); |
| 556 | |
| 557 | mcs = xen_mc_entry(sizeof(*op)); |
Jeremy Fitzhardinge | d66bf8f | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 558 | op = mcs.args; |
| 559 | op->cmd = MMUEXT_INVLPG_LOCAL; |
| 560 | op->arg1.linear_addr = addr & PAGE_MASK; |
| 561 | MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF); |
| 562 | |
| 563 | xen_mc_issue(PARAVIRT_LAZY_MMU); |
Jeremy Fitzhardinge | 41e332b | 2008-04-02 10:54:09 -0700 | [diff] [blame] | 564 | |
| 565 | preempt_enable(); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 566 | } |
| 567 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 568 | static void xen_flush_tlb_others(const cpumask_t *cpus, struct mm_struct *mm, |
| 569 | unsigned long va) |
| 570 | { |
Jeremy Fitzhardinge | d66bf8f | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 571 | struct { |
| 572 | struct mmuext_op op; |
| 573 | cpumask_t mask; |
| 574 | } *args; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 575 | cpumask_t cpumask = *cpus; |
Jeremy Fitzhardinge | d66bf8f | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 576 | struct multicall_space mcs; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 577 | |
| 578 | /* |
| 579 | * A couple of (to be removed) sanity checks: |
| 580 | * |
| 581 | * - current CPU must not be in mask |
| 582 | * - mask must exist :) |
| 583 | */ |
| 584 | BUG_ON(cpus_empty(cpumask)); |
| 585 | BUG_ON(cpu_isset(smp_processor_id(), cpumask)); |
| 586 | BUG_ON(!mm); |
| 587 | |
| 588 | /* If a CPU which we ran on has gone down, OK. */ |
| 589 | cpus_and(cpumask, cpumask, cpu_online_map); |
| 590 | if (cpus_empty(cpumask)) |
| 591 | return; |
| 592 | |
Jeremy Fitzhardinge | d66bf8f | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 593 | mcs = xen_mc_entry(sizeof(*args)); |
| 594 | args = mcs.args; |
| 595 | args->mask = cpumask; |
| 596 | args->op.arg2.vcpumask = &args->mask; |
| 597 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 598 | if (va == TLB_FLUSH_ALL) { |
Jeremy Fitzhardinge | d66bf8f | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 599 | args->op.cmd = MMUEXT_TLB_FLUSH_MULTI; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 600 | } else { |
Jeremy Fitzhardinge | d66bf8f | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 601 | args->op.cmd = MMUEXT_INVLPG_MULTI; |
| 602 | args->op.arg1.linear_addr = va; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 603 | } |
| 604 | |
Jeremy Fitzhardinge | d66bf8f | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 605 | MULTI_mmuext_op(mcs.mc, &args->op, 1, NULL, DOMID_SELF); |
| 606 | |
| 607 | xen_mc_issue(PARAVIRT_LAZY_MMU); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 608 | } |
| 609 | |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 610 | static void xen_write_cr2(unsigned long cr2) |
| 611 | { |
| 612 | x86_read_percpu(xen_vcpu)->arch.cr2 = cr2; |
| 613 | } |
| 614 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 615 | static unsigned long xen_read_cr2(void) |
| 616 | { |
| 617 | return x86_read_percpu(xen_vcpu)->arch.cr2; |
| 618 | } |
| 619 | |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 620 | static unsigned long xen_read_cr2_direct(void) |
| 621 | { |
| 622 | return x86_read_percpu(xen_vcpu_info.arch.cr2); |
| 623 | } |
| 624 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 625 | static void xen_write_cr4(unsigned long cr4) |
| 626 | { |
Jeremy Fitzhardinge | 389a3c0 | 2007-09-18 22:46:33 -0700 | [diff] [blame] | 627 | /* Just ignore cr4 changes; Xen doesn't allow us to do |
| 628 | anything anyway. */ |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 629 | } |
| 630 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 631 | static unsigned long xen_read_cr3(void) |
| 632 | { |
| 633 | return x86_read_percpu(xen_cr3); |
| 634 | } |
| 635 | |
Jeremy Fitzhardinge | 9f79991 | 2007-10-16 11:51:30 -0700 | [diff] [blame] | 636 | static void set_current_cr3(void *v) |
| 637 | { |
| 638 | x86_write_percpu(xen_current_cr3, (unsigned long)v); |
| 639 | } |
| 640 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 641 | static void xen_write_cr3(unsigned long cr3) |
| 642 | { |
Jeremy Fitzhardinge | 9f79991 | 2007-10-16 11:51:30 -0700 | [diff] [blame] | 643 | struct mmuext_op *op; |
| 644 | struct multicall_space mcs; |
| 645 | unsigned long mfn = pfn_to_mfn(PFN_DOWN(cr3)); |
| 646 | |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 647 | BUG_ON(preemptible()); |
| 648 | |
Jeremy Fitzhardinge | 9f79991 | 2007-10-16 11:51:30 -0700 | [diff] [blame] | 649 | mcs = xen_mc_entry(sizeof(*op)); /* disables interrupts */ |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 650 | |
Jeremy Fitzhardinge | 9f79991 | 2007-10-16 11:51:30 -0700 | [diff] [blame] | 651 | /* Update while interrupts are disabled, so its atomic with |
| 652 | respect to ipis */ |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 653 | x86_write_percpu(xen_cr3, cr3); |
| 654 | |
Jeremy Fitzhardinge | 9f79991 | 2007-10-16 11:51:30 -0700 | [diff] [blame] | 655 | op = mcs.args; |
| 656 | op->cmd = MMUEXT_NEW_BASEPTR; |
| 657 | op->arg1.mfn = mfn; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 658 | |
Jeremy Fitzhardinge | 9f79991 | 2007-10-16 11:51:30 -0700 | [diff] [blame] | 659 | MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 660 | |
Jeremy Fitzhardinge | 9f79991 | 2007-10-16 11:51:30 -0700 | [diff] [blame] | 661 | /* Update xen_update_cr3 once the batch has actually |
| 662 | been submitted. */ |
| 663 | xen_mc_callback(set_current_cr3, (void *)cr3); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 664 | |
Jeremy Fitzhardinge | 9f79991 | 2007-10-16 11:51:30 -0700 | [diff] [blame] | 665 | xen_mc_issue(PARAVIRT_LAZY_CPU); /* interrupts restored */ |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 666 | } |
| 667 | |
Jeremy Fitzhardinge | f4f97b3 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 668 | /* Early in boot, while setting up the initial pagetable, assume |
| 669 | everything is pinned. */ |
Jeremy Fitzhardinge | 6944a9c | 2008-03-17 16:37:01 -0700 | [diff] [blame] | 670 | static __init void xen_alloc_pte_init(struct mm_struct *mm, u32 pfn) |
Jeremy Fitzhardinge | f4f97b3 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 671 | { |
Jeremy Fitzhardinge | af7ae3b | 2008-04-02 10:54:12 -0700 | [diff] [blame] | 672 | #ifdef CONFIG_FLATMEM |
Jeremy Fitzhardinge | f4f97b3 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 673 | BUG_ON(mem_map); /* should only be used early */ |
Jeremy Fitzhardinge | af7ae3b | 2008-04-02 10:54:12 -0700 | [diff] [blame] | 674 | #endif |
Jeremy Fitzhardinge | f4f97b3 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 675 | make_lowmem_page_readonly(__va(PFN_PHYS(pfn))); |
| 676 | } |
| 677 | |
Jeremy Fitzhardinge | 6944a9c | 2008-03-17 16:37:01 -0700 | [diff] [blame] | 678 | /* Early release_pte assumes that all pts are pinned, since there's |
Jeremy Fitzhardinge | 1c70e9b | 2008-01-30 13:33:39 +0100 | [diff] [blame] | 679 | only init_mm and anything attached to that is pinned. */ |
Jeremy Fitzhardinge | 6944a9c | 2008-03-17 16:37:01 -0700 | [diff] [blame] | 680 | static void xen_release_pte_init(u32 pfn) |
Jeremy Fitzhardinge | 1c70e9b | 2008-01-30 13:33:39 +0100 | [diff] [blame] | 681 | { |
| 682 | make_lowmem_page_readwrite(__va(PFN_PHYS(pfn))); |
| 683 | } |
| 684 | |
Mark McLoughlin | f643370 | 2008-04-02 15:36:36 +0100 | [diff] [blame] | 685 | static void pin_pagetable_pfn(unsigned cmd, unsigned long pfn) |
Jeremy Fitzhardinge | 7426071 | 2007-10-16 11:51:30 -0700 | [diff] [blame] | 686 | { |
| 687 | struct mmuext_op op; |
Mark McLoughlin | f643370 | 2008-04-02 15:36:36 +0100 | [diff] [blame] | 688 | op.cmd = cmd; |
Jeremy Fitzhardinge | 7426071 | 2007-10-16 11:51:30 -0700 | [diff] [blame] | 689 | op.arg1.mfn = pfn_to_mfn(pfn); |
| 690 | if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF)) |
| 691 | BUG(); |
| 692 | } |
| 693 | |
Jeremy Fitzhardinge | f4f97b3 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 694 | /* This needs to make sure the new pte page is pinned iff its being |
| 695 | attached to a pinned pagetable. */ |
Jeremy Fitzhardinge | 1c70e9b | 2008-01-30 13:33:39 +0100 | [diff] [blame] | 696 | static void xen_alloc_ptpage(struct mm_struct *mm, u32 pfn, unsigned level) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 697 | { |
Jeremy Fitzhardinge | f4f97b3 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 698 | struct page *page = pfn_to_page(pfn); |
| 699 | |
| 700 | if (PagePinned(virt_to_page(mm->pgd))) { |
| 701 | SetPagePinned(page); |
| 702 | |
Jeremy Fitzhardinge | 7426071 | 2007-10-16 11:51:30 -0700 | [diff] [blame] | 703 | if (!PageHighMem(page)) { |
Jeremy Fitzhardinge | f4f97b3 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 704 | make_lowmem_page_readonly(__va(PFN_PHYS(pfn))); |
Mark McLoughlin | f643370 | 2008-04-02 15:36:36 +0100 | [diff] [blame] | 705 | if (level == PT_PTE) |
| 706 | pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn); |
Jeremy Fitzhardinge | 7426071 | 2007-10-16 11:51:30 -0700 | [diff] [blame] | 707 | } else |
Jeremy Fitzhardinge | f4f97b3 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 708 | /* make sure there are no stray mappings of |
| 709 | this page */ |
| 710 | kmap_flush_unused(); |
| 711 | } |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 712 | } |
| 713 | |
Jeremy Fitzhardinge | 6944a9c | 2008-03-17 16:37:01 -0700 | [diff] [blame] | 714 | static void xen_alloc_pte(struct mm_struct *mm, u32 pfn) |
Jeremy Fitzhardinge | 1c70e9b | 2008-01-30 13:33:39 +0100 | [diff] [blame] | 715 | { |
Mark McLoughlin | f643370 | 2008-04-02 15:36:36 +0100 | [diff] [blame] | 716 | xen_alloc_ptpage(mm, pfn, PT_PTE); |
Jeremy Fitzhardinge | 1c70e9b | 2008-01-30 13:33:39 +0100 | [diff] [blame] | 717 | } |
| 718 | |
Jeremy Fitzhardinge | 6944a9c | 2008-03-17 16:37:01 -0700 | [diff] [blame] | 719 | static void xen_alloc_pmd(struct mm_struct *mm, u32 pfn) |
Jeremy Fitzhardinge | 1c70e9b | 2008-01-30 13:33:39 +0100 | [diff] [blame] | 720 | { |
Mark McLoughlin | f643370 | 2008-04-02 15:36:36 +0100 | [diff] [blame] | 721 | xen_alloc_ptpage(mm, pfn, PT_PMD); |
Jeremy Fitzhardinge | 1c70e9b | 2008-01-30 13:33:39 +0100 | [diff] [blame] | 722 | } |
| 723 | |
Jeremy Fitzhardinge | f4f97b3 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 724 | /* This should never happen until we're OK to use struct page */ |
Mark McLoughlin | f643370 | 2008-04-02 15:36:36 +0100 | [diff] [blame] | 725 | static void xen_release_ptpage(u32 pfn, unsigned level) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 726 | { |
Jeremy Fitzhardinge | f4f97b3 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 727 | struct page *page = pfn_to_page(pfn); |
| 728 | |
| 729 | if (PagePinned(page)) { |
Jeremy Fitzhardinge | 7426071 | 2007-10-16 11:51:30 -0700 | [diff] [blame] | 730 | if (!PageHighMem(page)) { |
Mark McLoughlin | a684d69 | 2008-04-02 15:36:37 +0100 | [diff] [blame] | 731 | if (level == PT_PTE) |
| 732 | pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, pfn); |
Jeremy Fitzhardinge | f4f97b3 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 733 | make_lowmem_page_readwrite(__va(PFN_PHYS(pfn))); |
Jeremy Fitzhardinge | 7426071 | 2007-10-16 11:51:30 -0700 | [diff] [blame] | 734 | } |
Mark McLoughlin | c946c7d | 2008-04-02 15:36:38 +0100 | [diff] [blame] | 735 | ClearPagePinned(page); |
Jeremy Fitzhardinge | f4f97b3 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 736 | } |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 737 | } |
| 738 | |
Jeremy Fitzhardinge | 6944a9c | 2008-03-17 16:37:01 -0700 | [diff] [blame] | 739 | static void xen_release_pte(u32 pfn) |
Mark McLoughlin | f643370 | 2008-04-02 15:36:36 +0100 | [diff] [blame] | 740 | { |
| 741 | xen_release_ptpage(pfn, PT_PTE); |
| 742 | } |
| 743 | |
Jeremy Fitzhardinge | 6944a9c | 2008-03-17 16:37:01 -0700 | [diff] [blame] | 744 | static void xen_release_pmd(u32 pfn) |
Mark McLoughlin | f643370 | 2008-04-02 15:36:36 +0100 | [diff] [blame] | 745 | { |
| 746 | xen_release_ptpage(pfn, PT_PMD); |
| 747 | } |
| 748 | |
Jeremy Fitzhardinge | f4f97b3 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 749 | #ifdef CONFIG_HIGHPTE |
| 750 | static void *xen_kmap_atomic_pte(struct page *page, enum km_type type) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 751 | { |
Jeremy Fitzhardinge | f4f97b3 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 752 | pgprot_t prot = PAGE_KERNEL; |
| 753 | |
| 754 | if (PagePinned(page)) |
| 755 | prot = PAGE_KERNEL_RO; |
| 756 | |
| 757 | if (0 && PageHighMem(page)) |
| 758 | printk("mapping highpte %lx type %d prot %s\n", |
| 759 | page_to_pfn(page), type, |
| 760 | (unsigned long)pgprot_val(prot) & _PAGE_RW ? "WRITE" : "READ"); |
| 761 | |
| 762 | return kmap_atomic_prot(page, type, prot); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 763 | } |
Jeremy Fitzhardinge | f4f97b3 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 764 | #endif |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 765 | |
Jeremy Fitzhardinge | 9a4029f | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 766 | static __init pte_t mask_rw_pte(pte_t *ptep, pte_t pte) |
| 767 | { |
| 768 | /* If there's an existing pte, then don't allow _PAGE_RW to be set */ |
| 769 | if (pte_val_ma(*ptep) & _PAGE_PRESENT) |
| 770 | pte = __pte_ma(((pte_val_ma(*ptep) & _PAGE_RW) | ~_PAGE_RW) & |
| 771 | pte_val_ma(pte)); |
| 772 | |
| 773 | return pte; |
| 774 | } |
| 775 | |
| 776 | /* Init-time set_pte while constructing initial pagetables, which |
| 777 | doesn't allow RO pagetable pages to be remapped RW */ |
| 778 | static __init void xen_set_pte_init(pte_t *ptep, pte_t pte) |
| 779 | { |
| 780 | pte = mask_rw_pte(ptep, pte); |
| 781 | |
| 782 | xen_set_pte(ptep, pte); |
| 783 | } |
| 784 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 785 | static __init void xen_pagetable_setup_start(pgd_t *base) |
| 786 | { |
| 787 | pgd_t *xen_pgd = (pgd_t *)xen_start_info->pt_base; |
| 788 | |
Jeremy Fitzhardinge | 9a4029f | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 789 | /* special set_pte for pagetable initialization */ |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 790 | pv_mmu_ops.set_pte = xen_set_pte_init; |
Jeremy Fitzhardinge | 9a4029f | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 791 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 792 | init_mm.pgd = base; |
| 793 | /* |
| 794 | * copy top-level of Xen-supplied pagetable into place. For |
| 795 | * !PAE we can use this as-is, but for PAE it is a stand-in |
| 796 | * while we copy the pmd pages. |
| 797 | */ |
| 798 | memcpy(base, xen_pgd, PTRS_PER_PGD * sizeof(pgd_t)); |
| 799 | |
| 800 | if (PTRS_PER_PMD > 1) { |
| 801 | int i; |
| 802 | /* |
| 803 | * For PAE, need to allocate new pmds, rather than |
| 804 | * share Xen's, since Xen doesn't like pmd's being |
| 805 | * shared between address spaces. |
| 806 | */ |
| 807 | for (i = 0; i < PTRS_PER_PGD; i++) { |
| 808 | if (pgd_val_ma(xen_pgd[i]) & _PAGE_PRESENT) { |
| 809 | pmd_t *pmd = (pmd_t *)alloc_bootmem_low_pages(PAGE_SIZE); |
| 810 | |
| 811 | memcpy(pmd, (void *)pgd_page_vaddr(xen_pgd[i]), |
| 812 | PAGE_SIZE); |
| 813 | |
Jeremy Fitzhardinge | f4f97b3 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 814 | make_lowmem_page_readonly(pmd); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 815 | |
| 816 | set_pgd(&base[i], __pgd(1 + __pa(pmd))); |
| 817 | } else |
| 818 | pgd_clear(&base[i]); |
| 819 | } |
| 820 | } |
| 821 | |
| 822 | /* make sure zero_page is mapped RO so we can use it in pagetables */ |
| 823 | make_lowmem_page_readonly(empty_zero_page); |
| 824 | make_lowmem_page_readonly(base); |
| 825 | /* |
| 826 | * Switch to new pagetable. This is done before |
| 827 | * pagetable_init has done anything so that the new pages |
| 828 | * added to the table can be prepared properly for Xen. |
| 829 | */ |
| 830 | xen_write_cr3(__pa(base)); |
Jeremy Fitzhardinge | 2b54078 | 2008-02-13 16:20:35 +0100 | [diff] [blame] | 831 | |
| 832 | /* Unpin initial Xen pagetable */ |
| 833 | pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, |
| 834 | PFN_DOWN(__pa(xen_start_info->pt_base))); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 835 | } |
| 836 | |
Jeremy Fitzhardinge | 2e8fe71 | 2008-03-17 16:36:53 -0700 | [diff] [blame] | 837 | static __init void setup_shared_info(void) |
| 838 | { |
| 839 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { |
| 840 | unsigned long addr = fix_to_virt(FIX_PARAVIRT_BOOTMAP); |
| 841 | |
| 842 | /* |
| 843 | * Create a mapping for the shared info page. |
| 844 | * Should be set_fixmap(), but shared_info is a machine |
| 845 | * address with no corresponding pseudo-phys address. |
| 846 | */ |
| 847 | set_pte_mfn(addr, |
| 848 | PFN_DOWN(xen_start_info->shared_info), |
| 849 | PAGE_KERNEL); |
| 850 | |
| 851 | HYPERVISOR_shared_info = (struct shared_info *)addr; |
| 852 | } else |
| 853 | HYPERVISOR_shared_info = |
| 854 | (struct shared_info *)__va(xen_start_info->shared_info); |
| 855 | |
| 856 | #ifndef CONFIG_SMP |
| 857 | /* In UP this is as good a place as any to set up shared info */ |
| 858 | xen_setup_vcpu_info_placement(); |
| 859 | #endif |
| 860 | } |
| 861 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 862 | static __init void xen_pagetable_setup_done(pgd_t *base) |
| 863 | { |
Jeremy Fitzhardinge | f4f97b3 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 864 | /* This will work as long as patching hasn't happened yet |
| 865 | (which it hasn't) */ |
Jeremy Fitzhardinge | 6944a9c | 2008-03-17 16:37:01 -0700 | [diff] [blame] | 866 | pv_mmu_ops.alloc_pte = xen_alloc_pte; |
| 867 | pv_mmu_ops.alloc_pmd = xen_alloc_pmd; |
| 868 | pv_mmu_ops.release_pte = xen_release_pte; |
| 869 | pv_mmu_ops.release_pmd = xen_release_pmd; |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 870 | pv_mmu_ops.set_pte = xen_set_pte; |
Jeremy Fitzhardinge | f4f97b3 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 871 | |
Jeremy Fitzhardinge | 2e8fe71 | 2008-03-17 16:36:53 -0700 | [diff] [blame] | 872 | setup_shared_info(); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 873 | |
Jeremy Fitzhardinge | f4f97b3 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 874 | /* Actually pin the pagetable down, but we can't set PG_pinned |
| 875 | yet because the page structures don't exist yet. */ |
| 876 | { |
Jeremy Fitzhardinge | 7426071 | 2007-10-16 11:51:30 -0700 | [diff] [blame] | 877 | unsigned level; |
| 878 | |
Jeremy Fitzhardinge | f4f97b3 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 879 | #ifdef CONFIG_X86_PAE |
Jeremy Fitzhardinge | 7426071 | 2007-10-16 11:51:30 -0700 | [diff] [blame] | 880 | level = MMUEXT_PIN_L3_TABLE; |
Jeremy Fitzhardinge | f4f97b3 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 881 | #else |
Jeremy Fitzhardinge | 7426071 | 2007-10-16 11:51:30 -0700 | [diff] [blame] | 882 | level = MMUEXT_PIN_L2_TABLE; |
Jeremy Fitzhardinge | f4f97b3 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 883 | #endif |
Jeremy Fitzhardinge | 7426071 | 2007-10-16 11:51:30 -0700 | [diff] [blame] | 884 | |
| 885 | pin_pagetable_pfn(level, PFN_DOWN(__pa(base))); |
Jeremy Fitzhardinge | f4f97b3 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 886 | } |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 887 | } |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 888 | |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 889 | /* This is called once we have the cpu_possible_map */ |
| 890 | void __init xen_setup_vcpu_info_placement(void) |
| 891 | { |
| 892 | int cpu; |
| 893 | |
| 894 | for_each_possible_cpu(cpu) |
| 895 | xen_vcpu_setup(cpu); |
| 896 | |
| 897 | /* xen_vcpu_setup managed to place the vcpu_info within the |
| 898 | percpu area for all cpus, so make use of it */ |
| 899 | if (have_vcpu_info_placement) { |
| 900 | printk(KERN_INFO "Xen: using vcpu_info placement\n"); |
| 901 | |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 902 | pv_irq_ops.save_fl = xen_save_fl_direct; |
| 903 | pv_irq_ops.restore_fl = xen_restore_fl_direct; |
| 904 | pv_irq_ops.irq_disable = xen_irq_disable_direct; |
| 905 | pv_irq_ops.irq_enable = xen_irq_enable_direct; |
| 906 | pv_mmu_ops.read_cr2 = xen_read_cr2_direct; |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 907 | } |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 908 | } |
| 909 | |
Andi Kleen | ab144f5 | 2007-08-10 22:31:03 +0200 | [diff] [blame] | 910 | static unsigned xen_patch(u8 type, u16 clobbers, void *insnbuf, |
| 911 | unsigned long addr, unsigned len) |
Jeremy Fitzhardinge | 6487673 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 912 | { |
| 913 | char *start, *end, *reloc; |
| 914 | unsigned ret; |
| 915 | |
| 916 | start = end = reloc = NULL; |
| 917 | |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 918 | #define SITE(op, x) \ |
| 919 | case PARAVIRT_PATCH(op.x): \ |
Jeremy Fitzhardinge | 6487673 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 920 | if (have_vcpu_info_placement) { \ |
| 921 | start = (char *)xen_##x##_direct; \ |
| 922 | end = xen_##x##_direct_end; \ |
| 923 | reloc = xen_##x##_direct_reloc; \ |
| 924 | } \ |
| 925 | goto patch_site |
| 926 | |
| 927 | switch (type) { |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 928 | SITE(pv_irq_ops, irq_enable); |
| 929 | SITE(pv_irq_ops, irq_disable); |
| 930 | SITE(pv_irq_ops, save_fl); |
| 931 | SITE(pv_irq_ops, restore_fl); |
Jeremy Fitzhardinge | 6487673 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 932 | #undef SITE |
| 933 | |
| 934 | patch_site: |
| 935 | if (start == NULL || (end-start) > len) |
| 936 | goto default_patch; |
| 937 | |
Andi Kleen | ab144f5 | 2007-08-10 22:31:03 +0200 | [diff] [blame] | 938 | ret = paravirt_patch_insns(insnbuf, len, start, end); |
Jeremy Fitzhardinge | 6487673 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 939 | |
| 940 | /* Note: because reloc is assigned from something that |
| 941 | appears to be an array, gcc assumes it's non-null, |
| 942 | but doesn't know its relationship with start and |
| 943 | end. */ |
| 944 | if (reloc > start && reloc < end) { |
| 945 | int reloc_off = reloc - start; |
Andi Kleen | ab144f5 | 2007-08-10 22:31:03 +0200 | [diff] [blame] | 946 | long *relocp = (long *)(insnbuf + reloc_off); |
| 947 | long delta = start - (char *)addr; |
Jeremy Fitzhardinge | 6487673 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 948 | |
| 949 | *relocp += delta; |
| 950 | } |
| 951 | break; |
| 952 | |
| 953 | default_patch: |
| 954 | default: |
Andi Kleen | ab144f5 | 2007-08-10 22:31:03 +0200 | [diff] [blame] | 955 | ret = paravirt_patch_default(type, clobbers, insnbuf, |
| 956 | addr, len); |
Jeremy Fitzhardinge | 6487673 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 957 | break; |
| 958 | } |
| 959 | |
| 960 | return ret; |
| 961 | } |
| 962 | |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 963 | static const struct pv_info xen_info __initdata = { |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 964 | .paravirt_enabled = 1, |
| 965 | .shared_kernel_pmd = 0, |
| 966 | |
| 967 | .name = "Xen", |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 968 | }; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 969 | |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 970 | static const struct pv_init_ops xen_init_ops __initdata = { |
Jeremy Fitzhardinge | 6487673 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 971 | .patch = xen_patch, |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 972 | |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 973 | .banner = xen_banner, |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 974 | .memory_setup = xen_memory_setup, |
| 975 | .arch_setup = xen_arch_setup, |
Jeremy Fitzhardinge | f4f97b3 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 976 | .post_allocator_init = xen_mark_init_mm_pinned, |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 977 | }; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 978 | |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 979 | static const struct pv_time_ops xen_time_ops __initdata = { |
Jeremy Fitzhardinge | 15c8473 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 980 | .time_init = xen_time_init, |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 981 | |
Jeremy Fitzhardinge | 15c8473 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 982 | .set_wallclock = xen_set_wallclock, |
| 983 | .get_wallclock = xen_get_wallclock, |
| 984 | .get_cpu_khz = xen_cpu_khz, |
Jeremy Fitzhardinge | ab55028 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 985 | .sched_clock = xen_sched_clock, |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 986 | }; |
Jeremy Fitzhardinge | 15c8473 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 987 | |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 988 | static const struct pv_cpu_ops xen_cpu_ops __initdata = { |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 989 | .cpuid = xen_cpuid, |
| 990 | |
| 991 | .set_debugreg = xen_set_debugreg, |
| 992 | .get_debugreg = xen_get_debugreg, |
| 993 | |
| 994 | .clts = native_clts, |
| 995 | |
| 996 | .read_cr0 = native_read_cr0, |
| 997 | .write_cr0 = native_write_cr0, |
| 998 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 999 | .read_cr4 = native_read_cr4, |
| 1000 | .read_cr4_safe = native_read_cr4_safe, |
| 1001 | .write_cr4 = xen_write_cr4, |
| 1002 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1003 | .wbinvd = native_wbinvd, |
| 1004 | |
| 1005 | .read_msr = native_read_msr_safe, |
| 1006 | .write_msr = native_write_msr_safe, |
| 1007 | .read_tsc = native_read_tsc, |
| 1008 | .read_pmc = native_read_pmc, |
| 1009 | |
Jeremy Fitzhardinge | 81e103f | 2008-04-17 17:40:51 +0200 | [diff] [blame] | 1010 | .iret = xen_iret, |
Jeremy Fitzhardinge | e2a81ba | 2008-03-17 16:37:17 -0700 | [diff] [blame] | 1011 | .irq_enable_syscall_ret = xen_sysexit, |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1012 | |
| 1013 | .load_tr_desc = paravirt_nop, |
| 1014 | .set_ldt = xen_set_ldt, |
| 1015 | .load_gdt = xen_load_gdt, |
| 1016 | .load_idt = xen_load_idt, |
| 1017 | .load_tls = xen_load_tls, |
| 1018 | |
| 1019 | .store_gdt = native_store_gdt, |
| 1020 | .store_idt = native_store_idt, |
| 1021 | .store_tr = xen_store_tr, |
| 1022 | |
| 1023 | .write_ldt_entry = xen_write_ldt_entry, |
| 1024 | .write_gdt_entry = xen_write_gdt_entry, |
| 1025 | .write_idt_entry = xen_write_idt_entry, |
H. Peter Anvin | faca622 | 2008-01-30 13:31:02 +0100 | [diff] [blame] | 1026 | .load_sp0 = xen_load_sp0, |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1027 | |
| 1028 | .set_iopl_mask = xen_set_iopl_mask, |
| 1029 | .io_delay = xen_io_delay, |
| 1030 | |
Jeremy Fitzhardinge | 8965c1c | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 1031 | .lazy_mode = { |
| 1032 | .enter = paravirt_enter_lazy_cpu, |
| 1033 | .leave = xen_leave_lazy, |
| 1034 | }, |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 1035 | }; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1036 | |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 1037 | static const struct pv_irq_ops xen_irq_ops __initdata = { |
| 1038 | .init_IRQ = xen_init_IRQ, |
| 1039 | .save_fl = xen_save_fl, |
| 1040 | .restore_fl = xen_restore_fl, |
| 1041 | .irq_disable = xen_irq_disable, |
| 1042 | .irq_enable = xen_irq_enable, |
| 1043 | .safe_halt = xen_safe_halt, |
| 1044 | .halt = xen_halt, |
| 1045 | }; |
| 1046 | |
| 1047 | static const struct pv_apic_ops xen_apic_ops __initdata = { |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1048 | #ifdef CONFIG_X86_LOCAL_APIC |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1049 | .apic_write = xen_apic_write, |
| 1050 | .apic_write_atomic = xen_apic_write, |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1051 | .apic_read = xen_apic_read, |
| 1052 | .setup_boot_clock = paravirt_nop, |
| 1053 | .setup_secondary_clock = paravirt_nop, |
| 1054 | .startup_ipi_hook = paravirt_nop, |
| 1055 | #endif |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 1056 | }; |
| 1057 | |
| 1058 | static const struct pv_mmu_ops xen_mmu_ops __initdata = { |
| 1059 | .pagetable_setup_start = xen_pagetable_setup_start, |
| 1060 | .pagetable_setup_done = xen_pagetable_setup_done, |
| 1061 | |
| 1062 | .read_cr2 = xen_read_cr2, |
| 1063 | .write_cr2 = xen_write_cr2, |
| 1064 | |
| 1065 | .read_cr3 = xen_read_cr3, |
| 1066 | .write_cr3 = xen_write_cr3, |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1067 | |
| 1068 | .flush_tlb_user = xen_flush_tlb, |
| 1069 | .flush_tlb_kernel = xen_flush_tlb, |
| 1070 | .flush_tlb_single = xen_flush_tlb_single, |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1071 | .flush_tlb_others = xen_flush_tlb_others, |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1072 | |
| 1073 | .pte_update = paravirt_nop, |
| 1074 | .pte_update_defer = paravirt_nop, |
| 1075 | |
Jeremy Fitzhardinge | 6944a9c | 2008-03-17 16:37:01 -0700 | [diff] [blame] | 1076 | .alloc_pte = xen_alloc_pte_init, |
| 1077 | .release_pte = xen_release_pte_init, |
| 1078 | .alloc_pmd = xen_alloc_pte_init, |
| 1079 | .alloc_pmd_clone = paravirt_nop, |
| 1080 | .release_pmd = xen_release_pte_init, |
Jeremy Fitzhardinge | f4f97b3 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1081 | |
| 1082 | #ifdef CONFIG_HIGHPTE |
| 1083 | .kmap_atomic_pte = xen_kmap_atomic_pte, |
| 1084 | #endif |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1085 | |
Jeremy Fitzhardinge | 9a4029f | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1086 | .set_pte = NULL, /* see xen_pagetable_setup_* */ |
Jeremy Fitzhardinge | 3b827c1 | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1087 | .set_pte_at = xen_set_pte_at, |
| 1088 | .set_pmd = xen_set_pmd, |
| 1089 | |
| 1090 | .pte_val = xen_pte_val, |
| 1091 | .pgd_val = xen_pgd_val, |
| 1092 | |
| 1093 | .make_pte = xen_make_pte, |
| 1094 | .make_pgd = xen_make_pgd, |
| 1095 | |
| 1096 | #ifdef CONFIG_X86_PAE |
| 1097 | .set_pte_atomic = xen_set_pte_atomic, |
| 1098 | .set_pte_present = xen_set_pte_at, |
| 1099 | .set_pud = xen_set_pud, |
| 1100 | .pte_clear = xen_pte_clear, |
| 1101 | .pmd_clear = xen_pmd_clear, |
| 1102 | |
| 1103 | .make_pmd = xen_make_pmd, |
| 1104 | .pmd_val = xen_pmd_val, |
| 1105 | #endif /* PAE */ |
| 1106 | |
| 1107 | .activate_mm = xen_activate_mm, |
| 1108 | .dup_mmap = xen_dup_mmap, |
| 1109 | .exit_mmap = xen_exit_mmap, |
| 1110 | |
Jeremy Fitzhardinge | 8965c1c | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 1111 | .lazy_mode = { |
| 1112 | .enter = paravirt_enter_lazy_mmu, |
| 1113 | .leave = xen_leave_lazy, |
| 1114 | }, |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1115 | }; |
| 1116 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1117 | #ifdef CONFIG_SMP |
| 1118 | static const struct smp_ops xen_smp_ops __initdata = { |
| 1119 | .smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu, |
| 1120 | .smp_prepare_cpus = xen_smp_prepare_cpus, |
| 1121 | .cpu_up = xen_cpu_up, |
| 1122 | .smp_cpus_done = xen_smp_cpus_done, |
| 1123 | |
| 1124 | .smp_send_stop = xen_smp_send_stop, |
| 1125 | .smp_send_reschedule = xen_smp_send_reschedule, |
| 1126 | .smp_call_function_mask = xen_smp_call_function_mask, |
| 1127 | }; |
| 1128 | #endif /* CONFIG_SMP */ |
| 1129 | |
Jeremy Fitzhardinge | fefa629 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 1130 | static void xen_reboot(int reason) |
| 1131 | { |
| 1132 | #ifdef CONFIG_SMP |
| 1133 | smp_send_stop(); |
| 1134 | #endif |
| 1135 | |
| 1136 | if (HYPERVISOR_sched_op(SCHEDOP_shutdown, reason)) |
| 1137 | BUG(); |
| 1138 | } |
| 1139 | |
| 1140 | static void xen_restart(char *msg) |
| 1141 | { |
| 1142 | xen_reboot(SHUTDOWN_reboot); |
| 1143 | } |
| 1144 | |
| 1145 | static void xen_emergency_restart(void) |
| 1146 | { |
| 1147 | xen_reboot(SHUTDOWN_reboot); |
| 1148 | } |
| 1149 | |
| 1150 | static void xen_machine_halt(void) |
| 1151 | { |
| 1152 | xen_reboot(SHUTDOWN_poweroff); |
| 1153 | } |
| 1154 | |
| 1155 | static void xen_crash_shutdown(struct pt_regs *regs) |
| 1156 | { |
| 1157 | xen_reboot(SHUTDOWN_crash); |
| 1158 | } |
| 1159 | |
| 1160 | static const struct machine_ops __initdata xen_machine_ops = { |
| 1161 | .restart = xen_restart, |
| 1162 | .halt = xen_machine_halt, |
| 1163 | .power_off = xen_machine_halt, |
| 1164 | .shutdown = xen_machine_halt, |
| 1165 | .crash_shutdown = xen_crash_shutdown, |
| 1166 | .emergency_restart = xen_emergency_restart, |
| 1167 | }; |
| 1168 | |
Jeremy Fitzhardinge | 6487673 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 1169 | |
Jeremy Fitzhardinge | fb1d840 | 2007-10-16 11:51:31 -0700 | [diff] [blame] | 1170 | static void __init xen_reserve_top(void) |
| 1171 | { |
| 1172 | unsigned long top = HYPERVISOR_VIRT_START; |
| 1173 | struct xen_platform_parameters pp; |
| 1174 | |
| 1175 | if (HYPERVISOR_xen_version(XENVER_platform_parameters, &pp) == 0) |
| 1176 | top = pp.virt_start; |
| 1177 | |
| 1178 | reserve_top_address(-top + 2 * PAGE_SIZE); |
| 1179 | } |
| 1180 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1181 | /* First C function to be called on Xen boot */ |
| 1182 | asmlinkage void __init xen_start_kernel(void) |
| 1183 | { |
| 1184 | pgd_t *pgd; |
| 1185 | |
| 1186 | if (!xen_start_info) |
| 1187 | return; |
| 1188 | |
Jeremy Fitzhardinge | 7999f4b | 2007-12-10 13:00:41 -0800 | [diff] [blame] | 1189 | BUG_ON(memcmp(xen_start_info->magic, "xen-3", 5) != 0); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1190 | |
| 1191 | /* Install Xen paravirt ops */ |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 1192 | pv_info = xen_info; |
| 1193 | pv_init_ops = xen_init_ops; |
| 1194 | pv_time_ops = xen_time_ops; |
| 1195 | pv_cpu_ops = xen_cpu_ops; |
| 1196 | pv_irq_ops = xen_irq_ops; |
| 1197 | pv_apic_ops = xen_apic_ops; |
| 1198 | pv_mmu_ops = xen_mmu_ops; |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 1199 | |
Jeremy Fitzhardinge | fefa629 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 1200 | machine_ops = xen_machine_ops; |
| 1201 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1202 | #ifdef CONFIG_SMP |
| 1203 | smp_ops = xen_smp_ops; |
| 1204 | #endif |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1205 | |
| 1206 | xen_setup_features(); |
| 1207 | |
| 1208 | /* Get mfn list */ |
| 1209 | if (!xen_feature(XENFEAT_auto_translated_physmap)) |
| 1210 | phys_to_machine_mapping = (unsigned long *)xen_start_info->mfn_list; |
| 1211 | |
| 1212 | pgd = (pgd_t *)xen_start_info->pt_base; |
| 1213 | |
| 1214 | init_pg_tables_end = __pa(pgd) + xen_start_info->nr_pt_frames*PAGE_SIZE; |
| 1215 | |
| 1216 | init_mm.pgd = pgd; /* use the Xen pagetables to start */ |
| 1217 | |
| 1218 | /* keep using Xen gdt for now; no urgent need to change it */ |
| 1219 | |
| 1220 | x86_write_percpu(xen_cr3, __pa(pgd)); |
Jeremy Fitzhardinge | 9f79991 | 2007-10-16 11:51:30 -0700 | [diff] [blame] | 1221 | x86_write_percpu(xen_current_cr3, __pa(pgd)); |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 1222 | |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 1223 | /* Don't do the full vcpu_info placement stuff until we have a |
Jeremy Fitzhardinge | 2e8fe71 | 2008-03-17 16:36:53 -0700 | [diff] [blame] | 1224 | possible map and a non-dummy shared_info. */ |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 1225 | per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0]; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1226 | |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 1227 | pv_info.kernel_rpl = 1; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1228 | if (xen_feature(XENFEAT_supervisor_mode_kernel)) |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 1229 | pv_info.kernel_rpl = 0; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1230 | |
| 1231 | /* set the limit of our address space */ |
Jeremy Fitzhardinge | fb1d840 | 2007-10-16 11:51:31 -0700 | [diff] [blame] | 1232 | xen_reserve_top(); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1233 | |
| 1234 | /* set up basic CPUID stuff */ |
| 1235 | cpu_detect(&new_cpu_data); |
| 1236 | new_cpu_data.hard_math = 1; |
| 1237 | new_cpu_data.x86_capability[0] = cpuid_edx(1); |
| 1238 | |
| 1239 | /* Poke various useful things into boot_params */ |
H. Peter Anvin | 30c8264 | 2007-10-15 17:13:22 -0700 | [diff] [blame] | 1240 | boot_params.hdr.type_of_loader = (9 << 4) | 0; |
| 1241 | boot_params.hdr.ramdisk_image = xen_start_info->mod_start |
| 1242 | ? __pa(xen_start_info->mod_start) : 0; |
| 1243 | boot_params.hdr.ramdisk_size = xen_start_info->mod_len; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1244 | |
Markus Armbruster | b8c2d3d | 2008-02-27 14:56:35 +0100 | [diff] [blame] | 1245 | if (!is_initial_xendomain()) |
| 1246 | add_preferred_console("hvc", 0, NULL); |
| 1247 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1248 | /* Start the world */ |
| 1249 | start_kernel(); |
| 1250 | } |