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KVM: x86 emulator: Don't write-back cpu-state on X86EMUL_INTERCEPTED

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This patch prevents the changed CPU state to be written back
when the emulator detected that the instruction was
intercepted by the guest.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Joerg Roedel 2011-04-04 12:39:24 +02:00 • committed by Avi Kivity
parent 3c6e276f22
commit 775fde8648
3 changed files with 7 additions and 0 deletions
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3
arch/x86/kvm/emulate.c
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@ -3592,6 +3592,9 @@ writeback:
done:
if (rc == X86EMUL_PROPAGATE_FAULT)
ctxt->have_exception = true;
if (rc == X86EMUL_INTERCEPTED)
return EMULATION_INTERCEPTED;
return (rc == X86EMUL_UNHANDLEABLE) ? EMULATION_FAILED : EMULATION_OK;
twobyte_insn: