linux-kernel - Re: [Xen-devel] [PATCH] x86/xen: Initialize cr4 shadow for 64-bit PV(H) guests

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Date:	Tue, 03 Mar 2015 09:27:34 -0500
From:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:	"Luis R. Rodriguez" <mcgrof@...e.com>,
	David Vrabel <david.vrabel@...rix.com>
CC:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	xen-devel@...ts.xenproject.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andy Lutomirski <luto@...capital.net>
Subject: Re: [Xen-devel] [PATCH] x86/xen: Initialize cr4 shadow for 64-bit
 PV(H) guests

On 03/03/2015 12:35 AM, Luis R. Rodriguez wrote:
> On Mon, Feb 23, 2015 at 9:09 AM, David Vrabel <david.vrabel@...rix.com> wrote:
>> On 23/02/15 16:01, Boris Ostrovsky wrote:
>>> Commit 1e02ce4cccdc ("x86: Store a per-cpu shadow copy of CR4")
>>> introduced CR4 shadows.
>>>
>>> These shadows are initialized in early boot code. The commit missed
>>> initialization for 64-bit PV(H) guests that this patch adds.
>> Applied to stable/for-linus-4.0, thanks.
>>
>> Boris, can you kick of a set of tests on this branch, please?
> Do we know worst case what should blow up without this commit ?

PVH guest will crash.

-boris

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