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Re: Default reboot method (was: Re: Console output stops on dbgp=xhci)
- To: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 16 Sep 2022 13:44:36 +0200
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- Cc: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Fri, 16 Sep 2022 11:44:58 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 16.09.2022 12:55, Marek Marczykowski-Górecki wrote:
> On Fri, Sep 16, 2022 at 12:28:46PM +0200, Jan Beulich wrote:
>> On 16.09.2022 11:53, Marek Marczykowski-Górecki wrote:
>>> On Fri, Sep 16, 2022 at 07:57:59AM +0200, Jan Beulich wrote:
>>>> ... this leads to the crash, which effectively tells us that this is
>>>> likely yet another system where one needs to override the reboot
>>>> method (e.g. reboot=acpi).
>>>
>>> At least Linux, but also XenServer uses reboot=acpi by default (even on
>>> EFI systems), can we make it default in upstream Xen? Issues with
>>> reboot=efi are rather common, while reboot=acpi just works.
>>
>> But rebooting by means other than the EFI runtime service has always been
>> against the spirit of EFI.
>
> I'm afraid firmware developers (apparently) haven't heard of it. Can we
> have "works by default" behaviour?
Just like with e.g. the RTC, assuming availability of ACPI reboot is
wrong under EFI. A fully conforming implementation may not support
the ACPI method, while supporting the EFI runtime service. It is such
a (well written) implementation where I want Xen to work correctly by
default.
Jan
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