linux-kernel - Re: [Xen-devel] [PATCH v2] x86/xen: init %gs very early to avoid page faults with stack protector

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Date:   Fri, 2 Feb 2018 06:56:24 +0100
From:   Juergen Gross <jgross@...e.com>
To:     Chris Patterson <cjp256@...il.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:     linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
        stable@...r.kernel.org
Subject: Re: [Xen-devel] [PATCH v2] x86/xen: init %gs very early to avoid page
 faults with stack protector

On 02/02/18 01:36, Chris Patterson wrote:
> Works great, tested it and it fixes booting Linux v4.15 kernel for me :)

Can I add your "Tested-by:" to the patch when committing it?

Juergen

> 
> Cheers!
> 
> On Thu, Feb 1, 2018 at 3:17 PM, Boris Ostrovsky
> <boris.ostrovsky@...cle.com> wrote:
>> On 02/01/2018 07:40 AM, Juergen Gross wrote:
>>> When running as Xen pv guest %gs is initialized some time after
>>> C code is started. Depending on stack protector usage this might be
>>> too late, resulting in page faults.
>>>
>>> So setup %gs and MSR_GS_BASE in assembly code already.
>>>
>>> Cc: stable@...r.kernel.org
>>> Signed-off-by: Juergen Gross <jgross@...e.com>
>>
>> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>
>>
>>
>>
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@...ts.xenproject.org
>> https://lists.xenproject.org/mailman/listinfo/xen-devel
> 

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