Re: [PATCH] x86, kvm: Add MSR_AMD64_BU_CFG2 to the list of ignoredMSRs

From: Borislav Petkov
Date: Wed Feb 13 2013 - 08:36:04 EST

On Wed, Feb 13, 2013 at 02:10:02PM +0200, Gleb Natapov wrote:
> > > Is your guest compiled without PV support? With PV Linux traps #GP for
> > > all MSRs and it saves us in more than one places.
> >
> > Yes, CONFIG_PARAVIRT_GUEST is not set on the guest kernel.
> >
> Thanks. It does not mean that the patch should not be applied though.


but, come to think of it, adding an MSR each time to those functions
could turn out to be a PITA. The PV solution with trapping on the MSR
accesses might be better so maybe CONFIG_KVM should do

select KVM_GUEST


This is even a good forward-looking solution.

> I cannot seems to find the documentation for the MSR anywhere, do you
> have a pointer?, p.438



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