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KVM: x86 emulator: Add new mode of instruction emulation: skip

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In the new mode instruction is decoded, but not executed. The EIP
is moved to point after the instruction.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Gleb Natapov 2009-04-12 13:36:57 +03:00 committed by Avi Kivity
parent e637b8238a
commit ba8afb6b0a
2 changed files with 6 additions and 0 deletions
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1
arch/x86/include/asm/kvm_host.h
View File

@ -562,6 +562,7 @@ enum emulation_result {
#define EMULTYPE_NO_DECODE (1 << 0)
#define EMULTYPE_TRAP_UD (1 << 1)
#define EMULTYPE_SKIP (1 << 2)
int emulate_instruction(struct kvm_vcpu *vcpu, struct kvm_run *run,
unsigned long cr2, u16 error_code, int emulation_type);
void kvm_report_emulation_failure(struct kvm_vcpu *cvpu, const char *context);

5
arch/x86/kvm/x86.c
View File

@ -2413,6 +2413,11 @@ int emulate_instruction(struct kvm_vcpu *vcpu,
}
}
if (emulation_type & EMULTYPE_SKIP) {
kvm_rip_write(vcpu, vcpu->arch.emulate_ctxt.decode.eip);
return EMULATE_DONE;
}
r = x86_emulate_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
if (vcpu->arch.pio.string)