Signed-off-by: Jan Beulich <jbeul...@suse.com>
---
v3: New.
--- a/xen/arch/x86/x86_emulate/x86_emulate.c
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c
@@ -5047,6 +5047,24 @@ x86_emulate(
goto done;
break;
+ case 0xf8: /* swapgs */
+ generate_exception_if(!mode_64bit(), EXC_UD);
+ generate_exception_if(!mode_ring0(), EXC_GP, 0);
+ fail_if(!ops->read_segment || !ops->read_msr ||
+ !ops->write_segment || !ops->write_msr);
+ if ( (rc = ops->read_segment(x86_seg_gs, &sreg,
+ ctxt)) != X86EMUL_OKAY ||
+ (rc = ops->read_msr(MSR_SHADOW_GS_BASE, &msr_val,
+ ctxt)) != X86EMUL_OKAY ||
+ (rc = ops->write_msr(MSR_SHADOW_GS_BASE, sreg.base,
+ ctxt)) != X86EMUL_OKAY )
+ goto done;
+ sreg.base = msr_val;
+ if ( (rc = ops->write_segment(x86_seg_gs, &sreg,
+ ctxt)) != X86EMUL_OKAY )
+ goto done;
+ break;
+
case 0xf9: /* rdtscp */
fail_if(ops->read_msr == NULL);
if ( (rc = ops->read_msr(MSR_TSC_AUX,
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