Signed-off-by: Jan Beulich <jbeul...@suse.com>
--- a/xen/arch/x86/x86_emulate/x86_emulate.c
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c
@@ -5190,8 +5190,26 @@ 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: /* clflush{,opt} / sfence */
+ if ( modrm_mod == 3 )
+ {
+ generate_exception_if(vex.pfx, EXC_UD);
+ vcpu_must_have(sse);
+ asm volatile ( "sfence" ::: "memory" );
+ break;
+ }
if ( !vex.pfx )
vcpu_must_have(clflush);
else
x86emul: support fencing insns
Signed-off-by: Jan Beulich <jbeul...@suse.com>
--- a/xen/arch/x86/x86_emulate/x86_emulate.c
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c
@@ -5190,8 +5190,26 @@ 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: /* clflush{,opt} / sfence */
+ if ( modrm_mod == 3 )
+ {
+ generate_exception_if(vex.pfx, EXC_UD);
+ vcpu_must_have(sse);
+ asm volatile ( "sfence" ::: "memory" );
+ break;
+ }
if ( !vex.pfx )
vcpu_must_have(clflush);
else
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