[Xen-changelog] [xen master] x86emul: support fencing insns

[patchbot@xxxxxxx]

commit 7507ab8e7fec22f56bc374f280cda6f9b0388880
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Fri Jan 6 15:04:22 2017 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Jan 6 15:04:22 2017 +0100

    x86emul: support fencing insns
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/x86_emulate/x86_emulate.c | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/x86_emulate/x86_emulate.c 
b/xen/arch/x86/x86_emulate/x86_emulate.c
index 5b5c254..5694d09 100644
--- a/xen/arch/x86/x86_emulate/x86_emulate.c
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c
@@ -5343,8 +5343,27 @@ x86_emulate(
     case X86EMUL_OPC(0x0f, 0xae): case X86EMUL_OPC_66(0x0f, 0xae): /* Grp15 */
         switch ( modrm_reg & 7 )
         {
-        case 7: /* clflush{,opt} */
-            fail_if(modrm_mod == 3);
+        case 5: /* lfence */
+            fail_if(modrm_mod != 3);
+            generate_exception_if(vex.pfx, EXC_UD);
+            vcpu_must_have(sse2);
+            asm volatile ( "lfence" ::: "memory" );
+            break;
+        case 6: /* mfence */
+            fail_if(modrm_mod != 3);
+            generate_exception_if(vex.pfx, EXC_UD);
+            vcpu_must_have(sse2);
+            asm volatile ( "mfence" ::: "memory" );
+            break;
+        case 7:
+            if ( modrm_mod == 3 ) /* sfence */
+            {
+                generate_exception_if(vex.pfx, EXC_UD);
+                vcpu_must_have(sse);
+                asm volatile ( "sfence" ::: "memory" );
+                break;
+            }
+            /* else clflush{,opt} */
             if ( !vex.pfx )
                 vcpu_must_have(clflush);
             else
--
generated by git-patchbot for /home/xen/git/xen.git#master

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