linux-kernel - Re: [PATCH] KVM: SVM: Fix CPL export via SS.DPL

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Message-ID: <20140630152526.GA4399@minantech.com>
Date:	Mon, 30 Jun 2014 18:25:26 +0300
From:	Gleb Natapov <gleb@...nel.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Jan Kiszka <jan.kiszka@....de>,
	Paolo Bonzini <pbonzini@...hat.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>, x86-ml <x86@...nel.org>,
	kvm@...r.kernel.org, Jörg Rödel <joro@...tes.org>
Subject: Re: [PATCH] KVM: SVM: Fix CPL export via SS.DPL

On Mon, Jun 30, 2014 at 05:15:44PM +0200, Borislav Petkov wrote:
> On Mon, Jun 30, 2014 at 05:03:57PM +0200, Jan Kiszka wrote:
> > 15.5.1:
> > 
> > "When examining segment attributes after a #VMEXIT:
> > [...]
> > • Retrieve the CPL from the CPL field in the VMCB, not from any segment
> > DPL."
> 
> Heey, it is even documented! :-P
> 
Yes, on SVM we should always respect this field. Unfortunately there
is no such field in VMX, so we have to do DPL gymnastics there.

--
			Gleb.
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