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KVM: do not inject #PF in (read|write)_emulated() callbacks

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Return error to x86 emulator instead of injection exception behind its back.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Gleb Natapov
2010-04-28 19:15:37 +03:00
committed by Avi Kivity
parent f181b96d4c
commit 8fe681e984
3 changed files with 28 additions and 15 deletions
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28
arch/x86/kvm/x86.c
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@ -3346,10 +3346,10 @@ out:
static int emulator_read_emulated(unsigned long addr,
void *val,
unsigned int bytes,
unsigned int *error_code,
struct kvm_vcpu *vcpu)
{
gpa_t gpa;
u32 error_code;
if (vcpu->mmio_read_completed) {
memcpy(val, vcpu->mmio_data, bytes);
@ -3359,12 +3359,10 @@ static int emulator_read_emulated(unsigned long addr,
return X86EMUL_CONTINUE;
}
gpa = kvm_mmu_gva_to_gpa_read(vcpu, addr, &error_code);
gpa = kvm_mmu_gva_to_gpa_read(vcpu, addr, error_code);
if (gpa == UNMAPPED_GVA) {
kvm_inject_page_fault(vcpu, addr, error_code);
if (gpa == UNMAPPED_GVA)
return X86EMUL_PROPAGATE_FAULT;
}
/* For APIC access vmexit */
if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
@ -3409,17 +3407,15 @@ int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
static int emulator_write_emulated_onepage(unsigned long addr,
const void *val,
unsigned int bytes,
unsigned int *error_code,
struct kvm_vcpu *vcpu)
{
gpa_t gpa;
u32 error_code;
gpa = kvm_mmu_gva_to_gpa_write(vcpu, addr, &error_code);
gpa = kvm_mmu_gva_to_gpa_write(vcpu, addr, error_code);
if (gpa == UNMAPPED_GVA) {
kvm_inject_page_fault(vcpu, addr, error_code);
if (gpa == UNMAPPED_GVA)
return X86EMUL_PROPAGATE_FAULT;
}
/* For APIC access vmexit */
if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
@ -3449,6 +3445,7 @@ mmio:
int emulator_write_emulated(unsigned long addr,
const void *val,
unsigned int bytes,
unsigned int *error_code,
struct kvm_vcpu *vcpu)
{
/* Crossing a page boundary? */
@ -3456,14 +3453,16 @@ int emulator_write_emulated(unsigned long addr,
int rc, now;
now = -addr & ~PAGE_MASK;
rc = emulator_write_emulated_onepage(addr, val, now, vcpu);
rc = emulator_write_emulated_onepage(addr, val, now, error_code,
vcpu);
if (rc != X86EMUL_CONTINUE)
return rc;
addr += now;
val += now;
bytes -= now;
}
return emulator_write_emulated_onepage(addr, val, bytes, vcpu);
return emulator_write_emulated_onepage(addr, val, bytes, error_code,
vcpu);
}
#define CMPXCHG_TYPE(t, ptr, old, new) \
@ -3480,6 +3479,7 @@ static int emulator_cmpxchg_emulated(unsigned long addr,
const void *old,
const void *new,
unsigned int bytes,
unsigned int *error_code,
struct kvm_vcpu *vcpu)
{
gpa_t gpa;
@ -3533,7 +3533,7 @@ static int emulator_cmpxchg_emulated(unsigned long addr,
emul_write:
printk_once(KERN_WARNING "kvm: emulating exchange as write\n");
return emulator_write_emulated(addr, new, bytes, vcpu);
return emulator_write_emulated(addr, new, bytes, error_code, vcpu);
}
static int kernel_pio(struct kvm_vcpu *vcpu, void *pd)
@ -4293,7 +4293,7 @@ int kvm_fix_hypercall(struct kvm_vcpu *vcpu)
kvm_x86_ops->patch_hypercall(vcpu, instruction);
return emulator_write_emulated(rip, instruction, 3, vcpu);
return emulator_write_emulated(rip, instruction, 3, NULL, vcpu);
}
void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)