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KVM: x86 emulator: advance RIP outside x86 emulator code 

Return new RIP as part of instruction emulation result instead of
updating KVM's RIP from x86 emulator code.

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 19:15:39 +03:00 committed by Avi Kivity
parent 3457e4192e
commit 95c5588652
2 changed files with 6 additions and 3 deletions
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7
arch/x86/kvm/emulate.c
View File

@ -2496,8 +2496,9 @@ int emulator_task_switch(struct x86_emulate_ctxt *ctxt,
if (rc == X86EMUL_CONTINUE) {
memcpy(ctxt->vcpu->arch.regs, c->regs, sizeof c->regs);
kvm_rip_write(ctxt->vcpu, c->eip);
rc = writeback(ctxt, ops);
if (rc == X86EMUL_CONTINUE)
ctxt->eip = c->eip;
}
return (rc == X86EMUL_UNHANDLEABLE) ? -1 : 0;
@ -2554,7 +2555,7 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
if (address_mask(c, c->regs[VCPU_REGS_RCX]) == 0) {
string_done:
ctxt->restart = false;
kvm_rip_write(ctxt->vcpu, c->eip);
ctxt->eip = c->eip;
goto done;
}
/* The second termination condition only applies for REPE
@ -3032,7 +3033,7 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
ctxt->decode.mem_read.end = 0;
/* Commit shadow register state. */
memcpy(ctxt->vcpu->arch.regs, c->regs, sizeof c->regs);
kvm_rip_write(ctxt->vcpu, c->eip);
ctxt->eip = c->eip;
ops->set_rflags(ctxt->vcpu, ctxt->eflags);
done:

2
arch/x86/kvm/x86.c
View File

@ -3941,6 +3941,7 @@ int emulate_instruction(struct kvm_vcpu *vcpu,
shadow_mask = vcpu->arch.emulate_ctxt.interruptibility;
kvm_x86_ops->set_interrupt_shadow(vcpu, shadow_mask);
kvm_rip_write(vcpu, vcpu->arch.emulate_ctxt.eip);
if (vcpu->arch.pio.count) {
if (!vcpu->arch.pio.in)
@ -4945,6 +4946,7 @@ int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason,
if (ret)
return EMULATE_FAIL;
kvm_rip_write(vcpu, vcpu->arch.emulate_ctxt.eip);
kvm_x86_ops->set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags);
return EMULATE_DONE;
}