RFC/patch 2/3 portability: move x86 emulation and mmio device hook to x86.c

Carsten Otte
2007-10-30T17:44:21Z

This patch moves the following functions to from kvm_main.c to x86.c:
emulator_read/write_std, vcpu_find_pervcpu_dev, vcpu_find_mmio_dev,
emulator_read/write_emulated, emulator_write_phys,
emulator_write_emulated_onepage, emulator_cmpxchg_emulated,
get_setment_base, emulate_invlpg, emulate_clts, emulator_get/set_dr,
kvm_report_emulation_failure, emulate_instruction

The following data type is moved to x86.c:
struct x86_emulate_ops emulate_ops

Signed-off-by: Carsten Otte <cotte-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org>
---
kvm_main.c | 358 ------------------------------------------------------------
x86.c | 359 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 359 insertions(+), 358 deletions(-)
Index: kvm/drivers/kvm/kvm_main.c
===================================================================
--- kvm.orig/drivers/kvm/kvm_main.c 2007-10-30 18:06:24.000000000 +0100
+++ kvm/drivers/kvm/kvm_main.c 2007-10-30 18:27:56.000000000 +0100
@@ -817,370 +817,12 @@
}
}

-int emulator_read_std(unsigned long addr,
- void *val,
- unsigned int bytes,
- struct kvm_vcpu *vcpu)
-{
- void *data = val;
-
- while (bytes) {
- gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
- unsigned offset = addr & (PAGE_SIZE-1);
- unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
- int ret;
-
- if (gpa == UNMAPPED_GVA)
- return X86EMUL_PROPAGATE_FAULT;
- ret = kvm_read_guest(vcpu->kvm, gpa, data, tocopy);
- if (ret < 0)
- return X86EMUL_UNHANDLEABLE;
-
- bytes -= tocopy;
- data += tocopy;
- addr += tocopy;
- }
-
- return X86EMUL_CONTINUE;
-}
-EXPORT_SYMBOL_GPL(emulator_read_std);
-
-static int emulator_write_std(unsigned long addr,
- const void *val,
- unsigned int bytes,
- struct kvm_vcpu *vcpu)
-{
- pr_unimpl(vcpu, "emulator_write_std: addr %lx n %d\n", addr, bytes);
- return X86EMUL_UNHANDLEABLE;
-}
-
-/*
- * Only apic need an MMIO device hook, so shortcut now..
- */
-static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu,
- gpa_t addr)
-{
- struct kvm_io_device *dev;
-
- if (vcpu->apic) {
- dev = &vcpu->apic->dev;
- if (dev->in_range(dev, addr))
- return dev;
- }
- return NULL;
-}
-
-static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
- gpa_t addr)
-{
- struct kvm_io_device *dev;
-
- dev = vcpu_find_pervcpu_dev(vcpu, addr);
- if (dev == NULL)
- dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr);
- return dev;
-}
-
static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu,
gpa_t addr)
{
return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr);
}

-static int emulator_read_emulated(unsigned long addr,
- void *val,
- unsigned int bytes,
- struct kvm_vcpu *vcpu)
-{
- struct kvm_io_device *mmio_dev;
- gpa_t gpa;
-
- if (vcpu->mmio_read_completed) {
- memcpy(val, vcpu->mmio_data, bytes);
- vcpu->mmio_read_completed = 0;
- return X86EMUL_CONTINUE;
- }
-
- gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
-
- /* For APIC access vmexit */
- if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
- goto mmio;
-
- if (emulator_read_std(addr, val, bytes, vcpu)
- == X86EMUL_CONTINUE)
- return X86EMUL_CONTINUE;
- if (gpa == UNMAPPED_GVA)
- return X86EMUL_PROPAGATE_FAULT;
-
-mmio:
- /*
- * Is this MMIO handled locally?
- */
- mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
- if (mmio_dev) {
- kvm_iodevice_read(mmio_dev, gpa, bytes, val);
- return X86EMUL_CONTINUE;
- }
-
- vcpu->mmio_needed = 1;
- vcpu->mmio_phys_addr = gpa;
- vcpu->mmio_size = bytes;
- vcpu->mmio_is_write = 0;
-
- return X86EMUL_UNHANDLEABLE;
-}
-
-static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
- const void *val, int bytes)
-{
- int ret;
-
- ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
- if (ret < 0)
- return 0;
- kvm_mmu_pte_write(vcpu, gpa, val, bytes);
- return 1;
-}
-
-static int emulator_write_emulated_onepage(unsigned long addr,
- const void *val,
- unsigned int bytes,
- struct kvm_vcpu *vcpu)
-{
- struct kvm_io_device *mmio_dev;
- gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
-
- if (gpa == UNMAPPED_GVA) {
- kvm_x86_ops->inject_page_fault(vcpu, addr, 2);
- return X86EMUL_PROPAGATE_FAULT;
- }
-
- /* For APIC access vmexit */
- if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
- goto mmio;
-
- if (emulator_write_phys(vcpu, gpa, val, bytes))
- return X86EMUL_CONTINUE;
-
-mmio:
- /*
- * Is this MMIO handled locally?
- */
- mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
- if (mmio_dev) {
- kvm_iodevice_write(mmio_dev, gpa, bytes, val);
- return X86EMUL_CONTINUE;
- }
-
- vcpu->mmio_needed = 1;
- vcpu->mmio_phys_addr = gpa;
- vcpu->mmio_size = bytes;
- vcpu->mmio_is_write = 1;
- memcpy(vcpu->mmio_data, val, bytes);
-
- return X86EMUL_CONTINUE;
-}
-
-int emulator_write_emulated(unsigned long addr,
- const void *val,
- unsigned int bytes,
- struct kvm_vcpu *vcpu)
-{
- /* Crossing a page boundary? */
- if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
- int rc, now;
-
- now = -addr & ~PAGE_MASK;
- rc = emulator_write_emulated_onepage(addr, val, now, vcpu);
- if (rc != X86EMUL_CONTINUE)
- return rc;
- addr += now;
- val += now;
- bytes -= now;
- }
- return emulator_write_emulated_onepage(addr, val, bytes, vcpu);
-}
-EXPORT_SYMBOL_GPL(emulator_write_emulated);
-
-static int emulator_cmpxchg_emulated(unsigned long addr,
- const void *old,
- const void *new,
- unsigned int bytes,
- struct kvm_vcpu *vcpu)
-{
- static int reported;
-
- if (!reported) {
- reported = 1;
- printk(KERN_WARNING "kvm: emulating exchange as write\n");
- }
- return emulator_write_emulated(addr, new, bytes, vcpu);
-}
-
-static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
-{
- return kvm_x86_ops->get_segment_base(vcpu, seg);
-}
-
-int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
-{
- return X86EMUL_CONTINUE;
-}
-
-int emulate_clts(struct kvm_vcpu *vcpu)
-{
- vcpu->cr0 &= ~X86_CR0_TS;
- kvm_x86_ops->set_cr0(vcpu, vcpu->cr0);
- return X86EMUL_CONTINUE;
-}
-
-int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long *dest)
-{
- struct kvm_vcpu *vcpu = ctxt->vcpu;
-
- switch (dr) {
- case 0 ... 3:
- *dest = kvm_x86_ops->get_dr(vcpu, dr);
- return X86EMUL_CONTINUE;
- default:
- pr_unimpl(vcpu, "%s: unexpected dr %u\n", __FUNCTION__, dr);
- return X86EMUL_UNHANDLEABLE;
- }
-}
-
-int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
-{
- unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
- int exception;
-
- kvm_x86_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
- if (exception) {
- /* FIXME: better handling */
- return X86EMUL_UNHANDLEABLE;
- }
- return X86EMUL_CONTINUE;
-}
-
-void kvm_report_emulation_failure(struct kvm_vcpu *vcpu, const char *context)
-{
- static int reported;
- u8 opcodes[4];
- unsigned long rip = vcpu->rip;
- unsigned long rip_linear;
-
- rip_linear = rip + get_segment_base(vcpu, VCPU_SREG_CS);
-
- if (reported)
- return;
-
- emulator_read_std(rip_linear, (void *)opcodes, 4, vcpu);
-
- printk(KERN_ERR "emulation failed (%s) rip %lx %02x %02x %02x %02x\n",
- context, rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
- reported = 1;
-}
-EXPORT_SYMBOL_GPL(kvm_report_emulation_failure);
-
-struct x86_emulate_ops emulate_ops = {
- .read_std = emulator_read_std,
- .write_std = emulator_write_std,
- .read_emulated = emulator_read_emulated,
- .write_emulated = emulator_write_emulated,
- .cmpxchg_emulated = emulator_cmpxchg_emulated,
-};
-
-int emulate_instruction(struct kvm_vcpu *vcpu,
- struct kvm_run *run,
- unsigned long cr2,
- u16 error_code,
- int no_decode)
-{
- int r;
-
- vcpu->mmio_fault_cr2 = cr2;
- kvm_x86_ops->cache_regs(vcpu);
-
- vcpu->mmio_is_write = 0;
- vcpu->pio.string = 0;
-
- if (!no_decode) {
- int cs_db, cs_l;
- kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
-
- vcpu->emulate_ctxt.vcpu = vcpu;
- vcpu->emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);
- vcpu->emulate_ctxt.cr2 = cr2;
- vcpu->emulate_ctxt.mode =
- (vcpu->emulate_ctxt.eflags & X86_EFLAGS_VM)
- ? X86EMUL_MODE_REAL : cs_l
- ? X86EMUL_MODE_PROT64 : cs_db
- ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
-
- if (vcpu->emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
- vcpu->emulate_ctxt.cs_base = 0;
- vcpu->emulate_ctxt.ds_base = 0;
- vcpu->emulate_ctxt.es_base = 0;
- vcpu->emulate_ctxt.ss_base = 0;
- } else {
- vcpu->emulate_ctxt.cs_base =
- get_segment_base(vcpu, VCPU_SREG_CS);
- vcpu->emulate_ctxt.ds_base =
- get_segment_base(vcpu, VCPU_SREG_DS);
- vcpu->emulate_ctxt.es_base =
- get_segment_base(vcpu, VCPU_SREG_ES);
- vcpu->emulate_ctxt.ss_base =
- get_segment_base(vcpu, VCPU_SREG_SS);
- }
-
- vcpu->emulate_ctxt.gs_base =
- get_segment_base(vcpu, VCPU_SREG_GS);
- vcpu->emulate_ctxt.fs_base =
- get_segment_base(vcpu, VCPU_SREG_FS);
-
- r = x86_decode_insn(&vcpu->emulate_ctxt, &emulate_ops);
- if (r) {
- if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
- return EMULATE_DONE;
- return EMULATE_FAIL;
- }
- }
-
- r = x86_emulate_insn(&vcpu->emulate_ctxt, &emulate_ops);
-
- if (vcpu->pio.string)
- return EMULATE_DO_MMIO;
-
- if ((r || vcpu->mmio_is_write) && run) {
- run->exit_reason = KVM_EXIT_MMIO;
- run->mmio.phys_addr = vcpu->mmio_phys_addr;
- memcpy(run->mmio.data, vcpu->mmio_data, 8);
- run->mmio.len = vcpu->mmio_size;
- run->mmio.is_write = vcpu->mmio_is_write;
- }
-
- if (r) {
- if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
- return EMULATE_DONE;
- if (!vcpu->mmio_needed) {
- kvm_report_emulation_failure(vcpu, "mmio");
- return EMULATE_FAIL;
- }
- return EMULATE_DO_MMIO;
- }
-
- kvm_x86_ops->decache_regs(vcpu);
- kvm_x86_ops->set_rflags(vcpu, vcpu->emulate_ctxt.eflags);
-
- if (vcpu->mmio_is_write) {
- vcpu->mmio_needed = 0;
- return EMULATE_DO_MMIO;
- }
-
- return EMULATE_DONE;
-}
-EXPORT_SYMBOL_GPL(emulate_instruction);
-
/*
* The vCPU has executed a HLT instruction with in-kernel mode enabled.
*/
Index: kvm/drivers/kvm/x86.c
===================================================================
--- kvm.orig/drivers/kvm/x86.c 2007-10-30 18:06:24.000000000 +0100
+++ kvm/drivers/kvm/x86.c 2007-10-30 18:07:32.000000000 +0100
@@ -983,6 +983,365 @@
num_msrs_to_save = j;
}

+/*
+ * Only apic need an MMIO device hook, so shortcut now..
+ */
+static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu,
+ gpa_t addr)
+{
+ struct kvm_io_device *dev;
+
+ if (vcpu->apic) {
+ dev = &vcpu->apic->dev;
+ if (dev->in_range(dev, addr))
+ return dev;
+ }
+ return NULL;
+}
+
+
+static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
+ gpa_t addr)
+{
+ struct kvm_io_device *dev;
+
+ dev = vcpu_find_pervcpu_dev(vcpu, addr);
+ if (dev == NULL)
+ dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr);
+ return dev;
+}
+
+int emulator_read_std(unsigned long addr,
+ void *val,
+ unsigned int bytes,
+ struct kvm_vcpu *vcpu)
+{
+ void *data = val;
+
+ while (bytes) {
+ gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
+ unsigned offset = addr & (PAGE_SIZE-1);
+ unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
+ int ret;
+
+ if (gpa == UNMAPPED_GVA)
+ return X86EMUL_PROPAGATE_FAULT;
+ ret = kvm_read_guest(vcpu->kvm, gpa, data, tocopy);
+ if (ret < 0)
+ return X86EMUL_UNHANDLEABLE;
+
+ bytes -= tocopy;
+ data += tocopy;
+ addr += tocopy;
+ }
+
+ return X86EMUL_CONTINUE;
+}
+EXPORT_SYMBOL_GPL(emulator_read_std);
+
+static int emulator_write_std(unsigned long addr,
+ const void *val,
+ unsigned int bytes,
+ struct kvm_vcpu *vcpu)
+{
+ pr_unimpl(vcpu, "emulator_write_std: addr %lx n %d\n", addr, bytes);
+ return X86EMUL_UNHANDLEABLE;
+}
+
+static int emulator_read_emulated(unsigned long addr,
+ void *val,
+ unsigned int bytes,
+ struct kvm_vcpu *vcpu)
+{
+ struct kvm_io_device *mmio_dev;
+ gpa_t gpa;
+
+ if (vcpu->mmio_read_completed) {
+ memcpy(val, vcpu->mmio_data, bytes);
+ vcpu->mmio_read_completed = 0;
+ return X86EMUL_CONTINUE;
+ }
+
+ gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
+
+ /* For APIC access vmexit */
+ if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
+ goto mmio;
+
+ if (emulator_read_std(addr, val, bytes, vcpu)
+ == X86EMUL_CONTINUE)
+ return X86EMUL_CONTINUE;
+ if (gpa == UNMAPPED_GVA)
+ return X86EMUL_PROPAGATE_FAULT;
+
+mmio:
+ /*
+ * Is this MMIO handled locally?
+ */
+ mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
+ if (mmio_dev) {
+ kvm_iodevice_read(mmio_dev, gpa, bytes, val);
+ return X86EMUL_CONTINUE;
+ }
+
+ vcpu->mmio_needed = 1;
+ vcpu->mmio_phys_addr = gpa;
+ vcpu->mmio_size = bytes;
+ vcpu->mmio_is_write = 0;
+
+ return X86EMUL_UNHANDLEABLE;
+}
+
+static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
+ const void *val, int bytes)
+{
+ int ret;
+
+ ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
+ if (ret < 0)
+ return 0;
+ kvm_mmu_pte_write(vcpu, gpa, val, bytes);
+ return 1;
+}
+
+static int emulator_write_emulated_onepage(unsigned long addr,
+ const void *val,
+ unsigned int bytes,
+ struct kvm_vcpu *vcpu)
+{
+ struct kvm_io_device *mmio_dev;
+ gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
+
+ if (gpa == UNMAPPED_GVA) {
+ kvm_x86_ops->inject_page_fault(vcpu, addr, 2);
+ return X86EMUL_PROPAGATE_FAULT;
+ }
+
+ /* For APIC access vmexit */
+ if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
+ goto mmio;
+
+ if (emulator_write_phys(vcpu, gpa, val, bytes))
+ return X86EMUL_CONTINUE;
+
+mmio:
+ /*
+ * Is this MMIO handled locally?
+ */
+ mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
+ if (mmio_dev) {
+ kvm_iodevice_write(mmio_dev, gpa, bytes, val);
+ return X86EMUL_CONTINUE;
+ }
+
+ vcpu->mmio_needed = 1;
+ vcpu->mmio_phys_addr = gpa;
+ vcpu->mmio_size = bytes;
+ vcpu->mmio_is_write = 1;
+ memcpy(vcpu->mmio_data, val, bytes);
+
+ return X86EMUL_CONTINUE;
+}
+
+int emulator_write_emulated(unsigned long addr,
+ const void *val,
+ unsigned int bytes,
+ struct kvm_vcpu *vcpu)
+{
+ /* Crossing a page boundary? */
+ if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
+ int rc, now;
+
+ now = -addr & ~PAGE_MASK;
+ rc = emulator_write_emulated_onepage(addr, val, now, vcpu);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+ addr += now;
+ val += now;
+ bytes -= now;
+ }
+ return emulator_write_emulated_onepage(addr, val, bytes, vcpu);
+}
+EXPORT_SYMBOL_GPL(emulator_write_emulated);
+
+static int emulator_cmpxchg_emulated(unsigned long addr,
+ const void *old,
+ const void *new,
+ unsigned int bytes,
+ struct kvm_vcpu *vcpu)
+{
+ static int reported;
+
+ if (!reported) {
+ reported = 1;
+ printk(KERN_WARNING "kvm: emulating exchange as write\n");
+ }
+ return emulator_write_emulated(addr, new, bytes, vcpu);
+}
+
+static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
+{
+ return kvm_x86_ops->get_segment_base(vcpu, seg);
+}
+
+int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
+{
+ return X86EMUL_CONTINUE;
+}
+
+int emulate_clts(struct kvm_vcpu *vcpu)
+{
+ vcpu->cr0 &= ~X86_CR0_TS;
+ kvm_x86_ops->set_cr0(vcpu, vcpu->cr0);
+ return X86EMUL_CONTINUE;
+}
+
+int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long *dest)
+{
+ struct kvm_vcpu *vcpu = ctxt->vcpu;
+
+ switch (dr) {
+ case 0 ... 3:
+ *dest = kvm_x86_ops->get_dr(vcpu, dr);
+ return X86EMUL_CONTINUE;
+ default:
+ pr_unimpl(vcpu, "%s: unexpected dr %u\n", __FUNCTION__, dr);
+ return X86EMUL_UNHANDLEABLE;
+ }
+}
+
+int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
+{
+ unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
+ int exception;
+
+ kvm_x86_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
+ if (exception) {
+ /* FIXME: better handling */
+ return X86EMUL_UNHANDLEABLE;
+ }
+ return X86EMUL_CONTINUE;
+}
+
+void kvm_report_emulation_failure(struct kvm_vcpu *vcpu, const char *context)
+{
+ static int reported;
+ u8 opcodes[4];
+ unsigned long rip = vcpu->rip;
+ unsigned long rip_linear;
+
+ rip_linear = rip + get_segment_base(vcpu, VCPU_SREG_CS);
+
+ if (reported)
+ return;
+
+ emulator_read_std(rip_linear, (void *)opcodes, 4, vcpu);
+
+ printk(KERN_ERR "emulation failed (%s) rip %lx %02x %02x %02x %02x\n",
+ context, rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
+ reported = 1;
+}
+EXPORT_SYMBOL_GPL(kvm_report_emulation_failure);
+
+struct x86_emulate_ops emulate_ops = {
+ .read_std = emulator_read_std,
+ .write_std = emulator_write_std,
+ .read_emulated = emulator_read_emulated,
+ .write_emulated = emulator_write_emulated,
+ .cmpxchg_emulated = emulator_cmpxchg_emulated,
+};
+
+int emulate_instruction(struct kvm_vcpu *vcpu,
+ struct kvm_run *run,
+ unsigned long cr2,
+ u16 error_code,
+ int no_decode)
+{
+ int r;
+
+ vcpu->mmio_fault_cr2 = cr2;
+ kvm_x86_ops->cache_regs(vcpu);
+
+ vcpu->mmio_is_write = 0;
+ vcpu->pio.string = 0;
+
+ if (!no_decode) {
+ int cs_db, cs_l;
+ kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
+
+ vcpu->emulate_ctxt.vcpu = vcpu;
+ vcpu->emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);
+ vcpu->emulate_ctxt.cr2 = cr2;
+ vcpu->emulate_ctxt.mode =
+ (vcpu->emulate_ctxt.eflags & X86_EFLAGS_VM)
+ ? X86EMUL_MODE_REAL : cs_l
+ ? X86EMUL_MODE_PROT64 : cs_db
+ ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
+
+ if (vcpu->emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
+ vcpu->emulate_ctxt.cs_base = 0;
+ vcpu->emulate_ctxt.ds_base = 0;
+ vcpu->emulate_ctxt.es_base = 0;
+ vcpu->emulate_ctxt.ss_base = 0;
+ } else {
+ vcpu->emulate_ctxt.cs_base =
+ get_segment_base(vcpu, VCPU_SREG_CS);
+ vcpu->emulate_ctxt.ds_base =
+ get_segment_base(vcpu, VCPU_SREG_DS);
+ vcpu->emulate_ctxt.es_base =
+ get_segment_base(vcpu, VCPU_SREG_ES);
+ vcpu->emulate_ctxt.ss_base =
+ get_segment_base(vcpu, VCPU_SREG_SS);
+ }
+
+ vcpu->emulate_ctxt.gs_base =
+ get_segment_base(vcpu, VCPU_SREG_GS);
+ vcpu->emulate_ctxt.fs_base =
+ get_segment_base(vcpu, VCPU_SREG_FS);
+
+ r = x86_decode_insn(&vcpu->emulate_ctxt, &emulate_ops);
+ if (r) {
+ if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
+ return EMULATE_DONE;
+ return EMULATE_FAIL;
+ }
+ }
+
+ r = x86_emulate_insn(&vcpu->emulate_ctxt, &emulate_ops);
+
+ if (vcpu->pio.string)
+ return EMULATE_DO_MMIO;
+
+ if ((r || vcpu->mmio_is_write) && run) {
+ run->exit_reason = KVM_EXIT_MMIO;
+ run->mmio.phys_addr = vcpu->mmio_phys_addr;
+ memcpy(run->mmio.data, vcpu->mmio_data, 8);
+ run->mmio.len = vcpu->mmio_size;
+ run->mmio.is_write = vcpu->mmio_is_write;
+ }
+
+ if (r) {
+ if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
+ return EMULATE_DONE;
+ if (!vcpu->mmio_needed) {
+ kvm_report_emulation_failure(vcpu, "mmio");
+ return EMULATE_FAIL;
+ }
+ return EMULATE_DO_MMIO;
+ }
+
+ kvm_x86_ops->decache_regs(vcpu);
+ kvm_x86_ops->set_rflags(vcpu, vcpu->emulate_ctxt.eflags);
+
+ if (vcpu->mmio_is_write) {
+ vcpu->mmio_needed = 0;
+ return EMULATE_DO_MMIO;
+ }
+
+ return EMULATE_DONE;
+}
+EXPORT_SYMBOL_GPL(emulate_instruction);
+
__init void kvm_arch_init(void)
{
kvm_init_msr_list();