Re: [Xen-devel] Linux 4.19.5 fails to boot as Xen dom0

["Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>]

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.

-- 
 Kirill A. Shutemov

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