On 12/11/2015 11:13, Borislav Petkov wrote:
> Hey Paolo,
> do we apply stuff like that below?

If we really need to, we do.

> When booting guests all the time here, dmesg gets filled up with those
> "unhandled rdmsr" useless warnings. The patch below shuts them up.
> The only problem is that the IC CFG MSR has those fields
> defined starting from F15h and I don't see a way to check the
> family/model/stepping of the guest CPU in kvm. Is there?

Yes, see guest_cpuid_has_* for an example of reading the CPUID values.

But if it's defined for _all_ models starting at family 21, we can just
do it unconditionally.

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