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

>>> 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.


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