Inject #UD if guest attempts to do so. This is in accordance to Intel
SDM.
Signed-off-by: Gleb Natapov <gleb@xxxxxxxxxx>
---
arch/x86/kvm/emulate.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 9beda8e..08ac9cf 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2122,6 +2122,12 @@ special_insn:
int err;
sel = c->src.val;
+
+ if (c->modrm_reg == VCPU_SREG_CS) {
+ kvm_queue_exception(ctxt->vcpu, UD_VECTOR);
+ goto done;
+ }
+
if (c->modrm_reg == VCPU_SREG_SS)
toggle_interruptibility(ctxt, X86_SHADOW_INT_MOV_SS);
--
1.6.5
--
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