Re: [Xen-devel] [PATCH 4.9 and older] VMX: allow migration of guests with SSBD enabled

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
> Sent: Friday, November 23, 2018 4:30 PM
> 
> 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 <jbeulich@xxxxxxxx>

Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>

> 
> --- 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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