Eliminate the need to call back into KVM to get it from emulator.
Signed-off-by: Gleb Natapov <gleb@xxxxxxxxxx>
---
arch/x86/include/asm/kvm_emulate.h | 3 ++-
arch/x86/kvm/emulate.c | 12 ++++++------
arch/x86/kvm/x86.c | 1 +
3 files changed, 9 insertions(+), 7 deletions(-)
diff --git a/arch/x86/include/asm/kvm_emulate.h b/arch/x86/include/asm/kvm_emulate.h
index d8b2da0..032d02f 100644
--- a/arch/x86/include/asm/kvm_emulate.h
+++ b/arch/x86/include/asm/kvm_emulate.h
@@ -140,7 +140,7 @@ 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;
@@ -159,6 +159,7 @@ struct x86_emulate_ctxt {
struct kvm_vcpu *vcpu;
unsigned long eflags;
+ unsigned long eip; /* eip before instruction emulation */
int cpl;
/* Emulated execution mode, represented by an X86EMUL_MODE value. */
int mode;
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index ed29a52..2cc9ef4 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -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);
@@ -1874,7 +1874,7 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
}
}
c->regs[VCPU_REGS_RCX]--;
- c->eip = kvm_rip_read(ctxt->vcpu);
+ c->eip = ctxt->eip;
}
if (c->src.type == OP_MEM) {
@@ -2443,7 +2443,7 @@ 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;
@@ -2547,7 +2547,7 @@ 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;
@@ -2556,7 +2556,7 @@ 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;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 9b5fb43..41cf54c 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3500,6 +3500,7 @@ 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.cpl = kvm_x86_ops->get_cpl(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)
--
1.6.5
--
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