linux-kernel - Re: [PATCH] x86, kvm: Add MSR_AMD64_BU

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Date:	Wed, 13 Feb 2013 12:55:26 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Gleb Natapov <gleb@...hat.com>
Cc:	kvm@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	X86 ML <x86@...nel.org>, Borislav Petkov <bp@...e.de>,
	Boris Ostrovsky <boris.ostrovsky@....com>,
	Andre Przywara <andre@...rep.de>,
	Marcelo Tosatti <mtosatti@...hat.com>
Subject: Re: [PATCH] x86, kvm: Add MSR_AMD64_BU_CFG2 to the list of ignored
 MSRs

On Wed, Feb 13, 2013 at 01:47:47PM +0200, Gleb Natapov wrote:
> On Wed, Feb 13, 2013 at 12:42:41PM +0100, Borislav Petkov wrote:
> > From: Borislav Petkov <bp@...e.de>
> > 
> > The "x86, AMD: Enable WC+ memory type on family 10 processors" patch
> > currently in -tip added a workaround for AMD F10h CPUs which #GPs my
> > guest when booted in kvm. This is because it accesses MSR_AMD64_BU_CFG2
> > which is not currently ignored by kvm. Do that because this MSR is only
> > baremetal-relevant anyway. While at it, move the ignored MSRs at the
> > beginning of kvm_set_msr_common so that we exit then and there.
> > 
> 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.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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