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KVM: Provide current eip as part of emulator context. 

Eliminate the need to call back into KVM to get it from emulator.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Gleb Natapov 2010-03-18 15:20:06 +02:00 committed by Avi Kivity
parent 9c5372445c
commit 063db061b9
3 changed files with 9 additions and 7 deletions
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3
arch/x86/include/asm/kvm_emulate.h
View File

@ -141,7 +141,7 @@ struct decode_cache {
u8 seg_override;
unsigned int d;
unsigned long regs[NR_VCPU_REGS];
unsigned long eip, eip_orig;
unsigned long eip;
/* modrm */
u8 modrm;
u8 modrm_mod;
@ -160,6 +160,7 @@ struct x86_emulate_ctxt {
struct kvm_vcpu *vcpu;
unsigned long eflags;
unsigned long eip; /* eip before instruction emulation */
/* Emulated execution mode, represented by an X86EMUL_MODE value. */
int mode;
u32 cs_base;

12
arch/x86/kvm/emulate.c
View File

@ -667,7 +667,7 @@ static int do_insn_fetch(struct x86_emulate_ctxt *ctxt,
int rc;
/* x86 instructions are limited to 15 bytes. */
if (eip + size - ctxt->decode.eip_orig > 15)
if (eip + size - ctxt->eip > 15)
return X86EMUL_UNHANDLEABLE;
eip += ctxt->cs_base;
while (size--) {
@ -927,7 +927,7 @@ x86_decode_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
/* Shadow copy of register state. Committed on successful emulation. */
memset(c, 0, sizeof(struct decode_cache));
c->eip = c->eip_orig = kvm_rip_read(ctxt->vcpu);
c->eip = ctxt->eip;
ctxt->cs_base = seg_base(ctxt, VCPU_SREG_CS);
memcpy(c->regs, ctxt->vcpu->arch.regs, sizeof c->regs);
@ -1878,7 +1878,7 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
}
}
register_address_increment(c, &c->regs[VCPU_REGS_RCX], -1);
c->eip = kvm_rip_read(ctxt->vcpu);
c->eip = ctxt->eip;
}
if (c->src.type == OP_MEM) {
@ -2447,7 +2447,7 @@ twobyte_insn:
goto done;
/* Let the processor re-execute the fixed hypercall */
c->eip = kvm_rip_read(ctxt->vcpu);
c->eip = ctxt->eip;
/* Disable writeback. */
c->dst.type = OP_NONE;
break;
@ -2551,7 +2551,7 @@ twobyte_insn:
| ((u64)c->regs[VCPU_REGS_RDX] << 32);
if (kvm_set_msr(ctxt->vcpu, c->regs[VCPU_REGS_RCX], msr_data)) {
kvm_inject_gp(ctxt->vcpu, 0);
c->eip = kvm_rip_read(ctxt->vcpu);
c->eip = ctxt->eip;
}
rc = X86EMUL_CONTINUE;
c->dst.type = OP_NONE;
@ -2560,7 +2560,7 @@ twobyte_insn:
/* rdmsr */
if (kvm_get_msr(ctxt->vcpu, c->regs[VCPU_REGS_RCX], &msr_data)) {
kvm_inject_gp(ctxt->vcpu, 0);
c->eip = kvm_rip_read(ctxt->vcpu);
c->eip = ctxt->eip;
} else {
c->regs[VCPU_REGS_RAX] = (u32)msr_data;
c->regs[VCPU_REGS_RDX] = msr_data >> 32;

1
arch/x86/kvm/x86.c
View File

@ -3531,6 +3531,7 @@ int emulate_instruction(struct kvm_vcpu *vcpu,
vcpu->arch.emulate_ctxt.vcpu = vcpu;
vcpu->arch.emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);
vcpu->arch.emulate_ctxt.eip = kvm_rip_read(vcpu);
vcpu->arch.emulate_ctxt.mode =
(!is_protmode(vcpu)) ? X86EMUL_MODE_REAL :
(vcpu->arch.emulate_ctxt.eflags & X86_EFLAGS_VM)