diff mbox series

x86emul: MOVBE requires a memory operand

Message ID 157a6ac0-6929-4e01-8588-7e5591427654@suse.com (mailing list archive)
State New
Headers show
Series x86emul: MOVBE requires a memory operand | expand

Commit Message

Jan Beulich Nov. 27, 2024, 7:15 a.m. UTC 
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@suse.com>
diff mbox series

Patch

--- 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 )
         {