KVM: x86 emulator: disable writeback for debug register instructions
These are handled internally by the instruction.
Signed-off-by: Avi Kivity <[email protected]>
diff --git a/drivers/kvm/x86_emulate.c b/drivers/kvm/x86_emulate.c
index 1a90ba0..2136da5 100644
--- a/drivers/kvm/x86_emulate.c
+++ b/drivers/kvm/x86_emulate.c
@@ -1222,11 +1222,13 @@ twobyte_insn:
}
break;
case 0x21: /* mov from dr to reg */
+ no_wb = 1;
if (modrm_mod != 3)
goto cannot_emulate;
rc = emulator_get_dr(ctxt, modrm_reg, &_regs[modrm_rm]);
break;
case 0x23: /* mov from reg to dr */
+ no_wb = 1;
if (modrm_mod != 3)
goto cannot_emulate;
rc = emulator_set_dr(ctxt, modrm_reg, _regs[modrm_rm]);
-
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