Re: [Xen-devel] [PATCH 8/9] x86/amd: Virtualise MSR_VIRT_SPEC_CTRL for guests

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 04.12.18 at 22:35, <Brian.Woods@xxxxxxx> wrote:
> The other thing I don't get is why advertise virtualized SSBD when the
> guest setting it does nothing?  If ssbd_opt=true is set, as the code is
> now, why even advertise it to the guest?  I'd suggest either allowing
> the guest to turn it off or not advertise it at all (when ssbd_opt =
> true).

I think it's better to advertise the feature nevertheless: Otherwise
the guest might either try some other way of mitigating the
(believed) vulnerability, or it may report in its logs that it's vulnerable
(without mitigation) when it really isn't.

Jan



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