From ba8afb6b0a2c7e06da760ffe5d078245058619b5 Mon Sep 17 00:00:00 2001 From: Gleb Natapov Date: Sun, 12 Apr 2009 13:36:57 +0300 Subject: [PATCH] KVM: x86 emulator: Add new mode of instruction emulation: skip In the new mode instruction is decoded, but not executed. The EIP is moved to point after the instruction. Signed-off-by: Gleb Natapov Signed-off-by: Avi Kivity --- arch/x86/include/asm/kvm_host.h | 1 + arch/x86/kvm/x86.c | 5 +++++ 2 files changed, 6 insertions(+) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 0e3a7c6e522c..cb306cff2b49 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -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); diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index b5ac1b722454..8beccaa17690 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -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) -- 2.34.1