Re: aarch64 efi boot failures with qemu 6.0+

[Philippe Mathieu-Daudé]

On 7/28/21 4:03 PM, Guenter Roeck wrote:
> On 7/28/21 6:25 AM, Ard Biesheuvel wrote:
>> On Wed, 28 Jul 2021 at 15:11, Michael S. Tsirkin <mst@redhat.com> wrote:
>>>
>>> On Tue, Jul 27, 2021 at 12:36:03PM +0200, Igor Mammedov wrote:

>>> As others noted the original commit was kind of vague:
>>>
>>> 1. it said "Using _DSM #5 method to inform guest os not to ignore the
>>> PCI configuration
>>> that firmware has done at boot time could handle the differences."
>>> which is not what the spec says and not what the patch did -
>>> guest os does not ignore configuration even without this,
>>> it is just allowed to change it.
>>>
>>>
>>> 2. is says could result but does not report whether that happened in the
>>> field.
>>>
>>>
>>> Given this causes a regression I'm inclined to just revert for now.
>>> We can figure it out for the next release.
>>>
>>
>> For a revert of commit 0cf8882fd06ba0aeb1e90fa6f23fce85504d7e14, feel
>> free to include
>>
>> Acked-by: Ard Biesheuvel <ardb@kernel.org>
>>
> 
> and:
> 
> Tested-by: Guenter Roeck <linux@roeck-us.net>
> 
>> and please also involve me if any future debates on this subject flare
>> up again.

Thanks all, this thread has been very instructive.

Michael, if describing the issue in the revert is too complex, could you
include a link to this thread in the revert description?
(Message-Id: <20210724185234.GA2265457@roeck-us.net> or
https://www.mail-archive.com/qemu-devel@nongnu.org/msg826392.html)