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

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>

1 files changed, 3 insertions, 0 deletions

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index c2260e57450a..a2c31e527a99 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -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: