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Re: [Xen-devel] Linux 4.19.5 fails to boot as Xen dom0
- To: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Thu, 29 Nov 2018 14:35:17 +0100
- Autocrypt: addr=jgross@xxxxxxxx; prefer-encrypt=mutual; keydata= xsBNBFOMcBYBCACgGjqjoGvbEouQZw/ToiBg9W98AlM2QHV+iNHsEs7kxWhKMjrioyspZKOB ycWxw3ie3j9uvg9EOB3aN4xiTv4qbnGiTr3oJhkB1gsb6ToJQZ8uxGq2kaV2KL9650I1SJve dYm8Of8Zd621lSmoKOwlNClALZNew72NjJLEzTalU1OdT7/i1TXkH09XSSI8mEQ/ouNcMvIJ NwQpd369y9bfIhWUiVXEK7MlRgUG6MvIj6Y3Am/BBLUVbDa4+gmzDC9ezlZkTZG2t14zWPvx XP3FAp2pkW0xqG7/377qptDmrk42GlSKN4z76ELnLxussxc7I2hx18NUcbP8+uty4bMxABEB AAHNHkp1ZXJnZW4gR3Jvc3MgPGpncm9zc0BzdXNlLmRlPsLAeQQTAQIAIwUCU4xw6wIbAwcL CQgHAwIBBhUIAgkKCwQWAgMBAh4BAheAAAoJELDendYovxMvi4UH/Ri+OXlObzqMANruTd4N zmVBAZgx1VW6jLc8JZjQuJPSsd/a+bNr3BZeLV6lu4Pf1Yl2Log129EX1KWYiFFvPbIiq5M5 kOXTO8Eas4CaScCvAZ9jCMQCgK3pFqYgirwTgfwnPtxFxO/F3ZcS8jovza5khkSKL9JGq8Nk czDTruQ/oy0WUHdUr9uwEfiD9yPFOGqp4S6cISuzBMvaAiC5YGdUGXuPZKXLpnGSjkZswUzY d9BVSitRL5ldsQCg6GhDoEAeIhUC4SQnT9SOWkoDOSFRXZ+7+WIBGLiWMd+yKDdRG5RyP/8f 3tgGiB6cyuYfPDRGsELGjUaTUq3H2xZgIPfOwE0EU4xwFgEIAMsx+gDjgzAY4H1hPVXgoLK8 B93sTQFN9oC6tsb46VpxyLPfJ3T1A6Z6MVkLoCejKTJ3K9MUsBZhxIJ0hIyvzwI6aYJsnOew cCiCN7FeKJ/oA1RSUemPGUcIJwQuZlTOiY0OcQ5PFkV5YxMUX1F/aTYXROXgTmSaw0aC1Jpo w7Ss1mg4SIP/tR88/d1+HwkJDVW1RSxC1PWzGizwRv8eauImGdpNnseneO2BNWRXTJumAWDD pYxpGSsGHXuZXTPZqOOZpsHtInFyi5KRHSFyk2Xigzvh3b9WqhbgHHHE4PUVw0I5sIQt8hJq 5nH5dPqz4ITtCL9zjiJsExHuHKN3NZsAEQEAAcLAXwQYAQIACQUCU4xwFgIbDAAKCRCw3p3W KL8TL0P4B/9YWver5uD/y/m0KScK2f3Z3mXJhME23vGBbMNlfwbr+meDMrJZ950CuWWnQ+d+ Ahe0w1X7e3wuLVODzjcReQ/v7b4JD3wwHxe+88tgB9byc0NXzlPJWBaWV01yB2/uefVKryAf AHYEd0gCRhx7eESgNBe3+YqWAQawunMlycsqKa09dBDL1PFRosF708ic9346GLHRc6Vj5SRA UTHnQqLetIOXZm3a2eQ1gpQK9MmruO86Vo93p39bS1mqnLLspVrL4rhoyhsOyh0Hd28QCzpJ wKeHTd0MAWAirmewHXWPco8p1Wg+V+5xfZzuQY0f4tQxvOpXpt4gQ1817GQ5/Ed/wsDtBBgB CAAgFiEEhRJncuj2BJSl0Jf3sN6d1ii/Ey8FAlrd8NACGwIAgQkQsN6d1ii/Ey92IAQZFggA HRYhBFMtsHpB9jjzHji4HoBcYbtP2GO+BQJa3fDQAAoJEIBcYbtP2GO+TYsA/30H/0V6cr/W V+J/FCayg6uNtm3MJLo4rE+o4sdpjjsGAQCooqffpgA+luTT13YZNV62hAnCLKXH9n3+ZAgJ RtAyDWk1B/0SMDVs1wxufMkKC3Q/1D3BYIvBlrTVKdBYXPxngcRoqV2J77lscEvkLNUGsu/z W2pf7+P3mWWlrPMJdlbax00vevyBeqtqNKjHstHatgMZ2W0CFC4hJ3YEetuRBURYPiGzuJXU pAd7a7BdsqWC4o+GTm5tnGrCyD+4gfDSpkOT53S/GNO07YkPkm/8J4OBoFfgSaCnQ1izwgJQ jIpcG2fPCI2/hxf2oqXPYbKr1v4Z1wthmoyUgGN0LPTIm+B5vdY82wI5qe9uN6UOGyTH2B3p hRQUWqCwu2sqkI3LLbTdrnyDZaixT2T0f4tyF5Lfs+Ha8xVMhIyzNb1byDI5FKCb
- Cc: Hans van Kranenburg <hans@xxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, stable <stable@xxxxxxxxxxxxxxx>
- Delivery-date: Thu, 29 Nov 2018 13:36:22 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
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.
Juergen
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