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[PATCH] x86emul: MOVBE requires a memory operand
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 27 Nov 2024 08:15:56 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Wed, 27 Nov 2024 07:16:40 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
The reg-reg forms should cause #UD; they come into existence only with
APX, where MOVBE also extends BSWAP (for the latter not being "eligible"
to a REX2 prefix).
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
--- a/xen/arch/x86/x86_emulate/x86_emulate.c
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c
@@ -6824,6 +6824,7 @@ x86_emulate(
case X86EMUL_OPC(0x0f38, 0xf0): /* movbe m,r */
case X86EMUL_OPC(0x0f38, 0xf1): /* movbe r,m */
+ generate_exception_if(ea.type != OP_MEM, X86_EXC_UD);
vcpu_must_have(movbe);
switch ( op_bytes )
{
|