Re: [xen-unstable-smoke test] 171511: regressions - FAIL

[Demi Marie Obenour <demi@invisiblethingslab.com>]

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> > commit 8d410ac2c178e1dd1001cadddbe9ca75a9738c95
> > Author: Demi Marie Obenour <demi@invisiblethingslab.com>
> > Date:   Tue Jul 5 13:10:46 2022 +0200
> > 
> >     EFI: preserve the System Resource Table for dom0
> >     
> >     The EFI System Resource Table (ESRT) is necessary for fwupd to identify
> >     firmware updates to install.  According to the UEFI specification §23.4,
> >     the ESRT shall be stored in memory of type EfiBootServicesData.  However,
> >     memory of type EfiBootServicesData is considered general-purpose memory
> >     by Xen, so the ESRT needs to be moved somewhere where Xen will not
> >     overwrite it.  Copy the ESRT to memory of type EfiRuntimeServicesData,
> >     which Xen will not reuse.  dom0 can use the ESRT if (and only if) it is
> >     in memory of type EfiRuntimeServicesData.
> >     
> >     Earlier versions of this patch reserved the memory in which the ESRT was
> >     located.  This created awkward alignment problems, and required either
> >     splitting the E820 table or wasting memory.  It also would have required
> >     a new platform op for dom0 to use to indicate if the ESRT is reserved.
> >     By copying the ESRT into EfiRuntimeServicesData memory, the E820 table
> >     does not need to be modified, and dom0 can just check the type of the
> >     memory region containing the ESRT.  The copy is only done if the ESRT is
> >     not already in EfiRuntimeServicesData memory, avoiding memory leaks on
> >     repeated kexec.
> >     
> >     See https://lore.kernel.org/xen-devel/20200818184018.GN1679@mail-itl/T/
> >     for details.
> >     
> >     Signed-off-by: Demi Marie Obenour <demi@invisiblethingslab.com>
> >     Reviewed-by: Jan Beulich <jbeulich@suse.com>
> 
> ... this is the most likely candidate, considering in the log all we
> see is:
> 
> Xen 4.17-unstable (c/s Mon Jun 27 15:15:39 2022 +0200 git:61ff273322-dirty) EFI loader
> Jul  5 23:09:15.692859 Using configuration file 'xen.cfg'
> Jul  5 23:09:15.704878 vmlinuz: 0x00000083fb1ac000-0x00000083fc880a00
> Jul  5 23:09:15.704931 initrd.gz: 0x00000083f94b7000-0x00000083fb1ab6e8
> Jul  5 23:09:15.836836 xenpolicy: 0x00000083f94b4000-0x00000083f94b6a5f
> Jul  5 23:09:15.980866 Using bootargs from Xen configuration file.

This would not surprise me at all.  I was hoping that Jan would be able
to test this before he merged it, especially the ARM-specific stuff.
-- 
Sincerely,
Demi Marie Obenour (she/her/hers)
Invisible Things Lab

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