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

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Message-ID: <20160320185813.GG4230@pd.tnic>
Date:	Sun, 20 Mar 2016 19:58:13 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Andrey Korolyov <andrey@...l.ru>
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 09:42:15PM +0300, Andrey Korolyov wrote:
> 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).

Probably, but I don't think it is microcode patch related.

> Since there is no direct evidence of what exactly (data or pgt) is
> getting corrupted, would disabling npt for a testing purposes be
> helpful?

So I'm not sure what even happens here yet. I haven't seen anything out
of the ordinary in Marc's dmesg and I wasn't able to reproduce either.
So would it be good to try with "npt=0"? Sure, why not.

Marc, you could give that a try to see if it changes anything...

-- 
Regards/Gruss,
    Boris.

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