linux-kernel - Re: Sanitize CPU-state when switching from virtual-8086 mode to other task

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Date:	Tue, 31 Dec 2013 14:40:48 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	halfdog <me@...fdog.net>, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Sanitize CPU-state when switching from virtual-8086 mode to other
 task

On 12/31/2013 11:21 AM, Konrad Rzeszutek Wilk wrote:
> 
> So, I am wondering if this is related to " x86/fpu: CR0.TS should be set before trap
> into PV guest's #NM exception handle" which does have a similar pattern - you
> do enough of the task switches and the FPU is screwed.
> 
> See http://mid.gmane.org/1383720072-6242-1-git-send-email-gaoyang.zyh@taobao.com
> 
> (I thought there was a thread about this on LKML too but I can't
> find it).

That would be a bug in Xen, so I guess you're surmising a similar bug in
VirtualBox?

	-hpa


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