[Xen-changelog] [xen stable-4.7] x86emul: MOVNTI does not allow REP prefixes

[patchbot@xxxxxxx]

commit 78291493db0139c271a9e39aa4cdeefa58f0d7a7
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Wed Jan 18 10:10:01 2017 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Jan 18 10:10:01 2017 +0100

    x86emul: MOVNTI does not allow REP prefixes
    
    Just like 66, prefixes F3 and F2 cause #UD.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    master commit: 96a7cb37b921d2b320183d194d143262e1dd5b53
    master date: 2016-12-14 10:11:08 +0100
---
 xen/arch/x86/x86_emulate/x86_emulate.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/x86/x86_emulate/x86_emulate.c 
b/xen/arch/x86/x86_emulate/x86_emulate.c
index fe3af25..7503e51 100644
--- a/xen/arch/x86/x86_emulate/x86_emulate.c
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c
@@ -4777,7 +4777,7 @@ x86_emulate(
     case 0xc3: /* movnti */
         /* Ignore the non-temporal hint for now. */
         vcpu_must_have_sse2();
-        generate_exception_if(dst.bytes <= 2, EXC_UD, -1);
+        generate_exception_if(vex.pfx, EXC_UD, -1);
         dst.val = src.val;
         break;
 
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.7

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