linux-kernel - Re: Major KVM issues with kernel 4.5 on the host

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Message-ID: <CABYiri8XMThPtHgs4rNqjwcu5zzPrg88WJdGXfPSUdMTGpEfAw@mail.gmail.com>
Date:	Sun, 20 Mar 2016 21:42:15 +0300
From:	Andrey Korolyov <andrey@...l.ru>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Marc Haber <mh+linux-kernel@...schlus.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	kvm ML <kvm@...r.kernel.org>
Subject: Re: Major KVM issues with kernel 4.5 on the host

On Sun, Mar 20, 2016 at 9:25 PM, Borislav Petkov <bp@...en8.de> wrote:
> On Sun, Mar 20, 2016 at 08:14:58PM +0300, Andrey Korolyov wrote:
>> Kinda naive question - do you run same ucode version as Marc on his device?
>
> Yeah, we both have 0x010000dc.
>
> In case you're referring to the recent faulty AMD microcode patch -
> it doesn't apply here. The boxes in question are family 0x10 and the
> microcode patch is for family 0x15.
>

Yes, I suggested that the issue could fall over a different family as
well to expose explicit corruption of a guest pages (as opposed to a
generic corruption in a known case). Since there is no direct evidence
of what exactly (data or pgt) is getting corrupted, would disabling
npt for a testing purposes be helpful?