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KVM: x86 emulator: fix cli/sti instruction emulation

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If IOPL check fail, the cli/sti emulate GP and then we should
skip writeback since the default write OP is OP_REG.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Wei Yongjun 2010-07-06 16:54:19 +08:00 committed by Avi Kivity
parent b16b2b7bb5
commit 07cbc6c185
1 changed files with 6 additions and 4 deletions
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10
arch/x86/kvm/emulate.c
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@ -2979,17 +2979,19 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
c->dst.type = OP_NONE; /* Disable writeback. */
break;
case 0xfa: /* cli */
if (emulator_bad_iopl(ctxt, ops))
if (emulator_bad_iopl(ctxt, ops)) {
emulate_gp(ctxt, 0);
else {
goto done;
} else {
ctxt->eflags &= ~X86_EFLAGS_IF;
c->dst.type = OP_NONE; /* Disable writeback. */
}
break;
case 0xfb: /* sti */
if (emulator_bad_iopl(ctxt, ops))
if (emulator_bad_iopl(ctxt, ops)) {
emulate_gp(ctxt, 0);
else {
goto done;
} else {
ctxt->interruptibility = KVM_X86_SHADOW_INT_STI;
ctxt->eflags |= X86_EFLAGS_IF;
c->dst.type = OP_NONE; /* Disable writeback. */