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Subject: Re: [Xen-devel] [PATCH v2] x86/xen: init %gs very early to avoid page
 faults with stack protector
To:     Chris Patterson <cjp256@gmail.com>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc:     linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org,
        stable@vger.kernel.org
References: <20180201124019.11693-1-jgross@suse.com>
 <b8f04374-97f1-76d5-81b5-3583441833f4@oracle.com>
 <CABZSBQcmKBGZ2-i-YRL=Ux6hcAP0peR1zfaVh4Go9vr=JTRThQ@mail.gmail.com>
From:   Juergen Gross <jgross@suse.com>
Message-ID: <3a4fa32b-7909-9fa6-4b6c-71d6b51ad35d@suse.com>
Date:   Fri, 2 Feb 2018 06:56:24 +0100
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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@oracle.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@vger.kernel.org
>>> Signed-off-by: Juergen Gross <jgross@suse.com>
>>
>> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
>>
>>
>>
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>> Xen-devel@lists.xenproject.org
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>