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Re: [Xen-devel] Linux 4.19.5 fails to boot as Xen dom0
- To: Juergen Gross <jgross@xxxxxxxx>, Greg KH <greg@xxxxxxxxx>
- From: Hans van Kranenburg <hans@xxxxxxxxxxx>
- Date: Thu, 6 Dec 2018 12:33:47 +0100
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, stable <stable@xxxxxxxxxxxxxxx>, "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
- Delivery-date: Thu, 06 Dec 2018 11:33:57 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 12/6/18 12:31 PM, Juergen Gross wrote:
> On 06/12/2018 12:13, Greg KH wrote:
>> On Thu, Nov 29, 2018 at 02:35:17PM +0100, Juergen Gross wrote:
>>> On 29/11/2018 14:26, Kirill A. Shutemov wrote:
>>>> On Thu, Nov 29, 2018 at 09:41:25AM +0000, Juergen Gross wrote:
>>>>> On 29/11/2018 02:22, Hans van Kranenburg wrote:
>>>>>> Hi,
>>>>>>
>>>>>> As also seen at:
>>>>>> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=914951
>>>>>>
>>>>>> Attached there are two serial console output logs. One is starting with
>>>>>> Xen 4.11 (from debian unstable) as dom0, and the other one without Xen.
>>>>>>
>>>>>> [ 2.085543] BUG: unable to handle kernel paging request at
>>>>>> ffff888d9fffc000
>>>>>> [ 2.085610] PGD 200c067 P4D 200c067 PUD 0
>>>>>> [ 2.085674] Oops: 0000 [#1] SMP NOPTI
>>>>>> [ 2.085736] CPU: 1 PID: 1 Comm: swapper/0 Not tainted
>>>>>> 4.19.0-trunk-amd64 #1 Debian 4.19.5-1~exp1+pvh1
>>>>>> [ 2.085823] Hardware name: HP ProLiant DL360 G7, BIOS P68 05/21/2018
>>>>>> [ 2.085895] RIP: e030:ptdump_walk_pgd_level_core+0x1fd/0x490
>>>>>> [...]
>>>>>
>>>>> The offending stable commit is 4074ca7d8a1832921c865d250bbd08f3441b3657
>>>>> ("x86/mm: Move LDT remap out of KASLR region on 5-level paging"), this
>>>>> is commit d52888aa2753e3063a9d3a0c9f72f94aa9809c15 upstream.
>>>>>
>>>>> Current upstream kernel is booting fine under Xen, so in general the
>>>>> patch should be fine. Using an upstream kernel built from above commit
>>>>> (with the then needed Xen fixup patch 1457d8cf7664f34c4ba534) is fine,
>>>>> too.
>>>>>
>>>>> Kirill, are you aware of any prerequisite patch from 4.20 which could be
>>>>> missing in 4.19.5?
>>>>
>>>> I'm not.
>>>>
>>>> Let me look into this.
>>>>
>>>
>>> What is making me suspicious is the failure happening just after
>>> releasing the init memory. Maybe there is an access to .init.data
>>> segment or similar? The native kernel booting could be related to the
>>> usage of 2M mappings not being available in a PV-domain.
>>
>> Did this ever get fixed anywhere that I can properly backport it to the
>> 4.19.y tree?
>
> https://lore.kernel.org/lkml/20181130202328.65359-2-kirill.shutemov@xxxxxxxxxxxxxxx/
>
> Still pending upstream. Just pinged tglx.
And FYI, I actually use this patch on top of 4.19.5 now. It just applies
and works.
Hans
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