[Xen-changelog] [xen staging] x86emul: suppress general register update upon AVX gather failures

[patchbot@xxxxxxx]

commit 74f299bbd7d5cc52325b5866c17b44dd0bd1c5a2
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Wed Apr 3 10:14:32 2019 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Apr 3 10:14:32 2019 +0200

    x86emul: suppress general register update upon AVX gather failures
    
    While destination and mask registers may indeed need updating in this
    case, the rIP update in particular needs to be avoided, as well as e.g.
    raising a single step trap.
    
    Reported-by: George Dunlap <george.dunlap@xxxxxxxxxx>
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/x86_emulate/x86_emulate.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/xen/arch/x86/x86_emulate/x86_emulate.c 
b/xen/arch/x86/x86_emulate/x86_emulate.c
index ea02d100dd..0293a72292 100644
--- a/xen/arch/x86/x86_emulate/x86_emulate.c
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c
@@ -8547,6 +8547,9 @@ x86_emulate(
         invoke_stub("", "", "+m" (mask) : "a" (&mask));
         put_stub(stub);
 
+        if ( rc != X86EMUL_OKAY )
+            goto done;
+
         state->simd_size = simd_none;
         break;
     }
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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