[Xen-devel] [PATCH] x86emul: suppress alignment check for {, v}mov{d, q}

["Jan Beulich" <JBeulich@xxxxxxxx>]

When introducing support for these instructions, adjustment for the
alignment check logic (generating #GP(0)) was overlooked.

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
@@ -4940,7 +4940,7 @@ x86_emulate(
         {
             uint32_t mxcsr = 0;
 
-            if ( vex.pfx != vex_66 )
+            if ( ea.bytes < 16 || vex.pfx == vex_f3 )
                 mxcsr = MXCSR_MM;
             else if ( vcpu_has_misalignsse() )
                 asm ( "stmxcsr %0" : "=m" (mxcsr) );

Attachment: x86emul-movq-no-align.patch
Description: Text document

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