From: Jan Beulich <JBeulich@suse.com>
Date: Thu, 10 Nov 2016 12:29:32 +0000 (-0700)
Subject: x86emul: suppress alignment check for {,v}mov{d,q}
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~101
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=8dd7b8a8934e5d8bda9a07ef281cd8f8a4ee1e26;p=xen.git

x86emul: suppress alignment check for {,v}mov{d,q}

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

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Release-acked-by: Wei Liu <wei.liu2@citrix.com>
---

diff --git a/xen/arch/x86/x86_emulate/x86_emulate.c b/xen/arch/x86/x86_emulate/x86_emulate.c
index 67ef31d515..26214877c3 100644
--- 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) );