The backport of cd53023df9 ("x86/msr: Virtualise MSR_SPEC_CTRL.SSBD for
guests to use") did not mirror the PV side change into the HVM (VMX-
specific) code path.
Signed-off-by: Jan Beulich <jbeul...@suse.com>
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -978,7 +981,8 @@ static int vmx_load_msr(struct vcpu *v,
* ignored) when STIBP isn't enumerated in hardware.
*/
else if ( ctxt->msr[i].val &
- ~(SPEC_CTRL_IBRS | SPEC_CTRL_STIBP) )
+ ~(SPEC_CTRL_IBRS | SPEC_CTRL_STIBP |
+ (v->domain->arch.cpuid->feat.ssbd ? SPEC_CTRL_SSBD :
0)) )
err = -ENXIO;
else
v->arch.spec_ctrl = ctxt->msr[i].val;
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