linux-kernel - Re: [PATCHv2 7/7] kvm: host side for eoi optimization

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Message-ID: <20120513100426.GG4296@redhat.com>
Date:	Sun, 13 May 2012 13:04:26 +0300
From:	Gleb Natapov <gleb@...hat.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	x86@...nel.org, kvm@...r.kernel.org,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2 7/7] kvm: host side for eoi optimization

On Sun, May 13, 2012 at 01:01:28PM +0300, Michael S. Tsirkin wrote:
> > > +	if (eoi_enabled(vcpu))
> > > +		eoi_clr_pending(vcpu);
> > > +	vcpu->arch.eoi.msr_val = data;
> > > +	kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.eoi.data, addr);
> > This may fail.
> 
> On invalid address, yes. Then the cache hva will be set to invalid
> so accesses will fail too. So a malicious guest is only hurting
> itself.
> Maybe add a comment here?
> 
Kill it with #GP like other MSRs do.

--
			Gleb.
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