linux-kernel - Re: [PATCH] arm64: xen: Implement EFI reset

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Message-ID: <557da0c0-233b-1f56-242e-e8bc90892827@arm.com>
Date:   Thu, 6 Apr 2017 15:32:41 +0100
From:   Julien Grall <julien.grall@....com>
To:     Daniel Kiper <daniel.kiper@...cle.com>
Cc:     Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        xen-devel@...ts.xen.org, sstabellini@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: xen: Implement EFI reset_system callback

Hi Daniel,

On 06/04/17 15:27, Daniel Kiper wrote:
> On Thu, Apr 06, 2017 at 09:32:32AM +0100, Julien Grall wrote:
>> Hi Juergen,
>>
>> On 06/04/17 07:23, Juergen Gross wrote:
>>> On 05/04/17 21:49, Boris Ostrovsky wrote:
>>>> On 04/05/2017 02:14 PM, Julien Grall wrote:
>>>>> The x86 code has theoritically a similar issue, altought EFI does not
>>>>> seem to be the preferred method. I have left it unimplemented on x86 and
>>>>> CCed Linux Xen x86 maintainers to know their view here.
>>>>
>>>> (+Daniel)
>>>>
>>>> This could be a problem for x86 as well, at least theoretically.
>>>> xen_machine_power_off() may call pm_power_off(), which is efi.reset_system.
>>>>
>>>> So I think we should have a similar routine there.
>>>
>>> +1
>>>
>>> I don't see any problem with such a routine added, in contrast to
>>> potential "reboots" instead of power off without it.
>>>
>>> So I think this dummy xen_efi_reset_system() should be added to
>>> drivers/xen/efi.c instead.
>>
>> I will resend the patch during day with xen_efi_reset_system moved
>> to common code and implement the x86 counterpart (thought, I will
>> not be able to test it).
>
> I think that this is ARM specific issue. On x86 machine_restart() calls
> xen_restart(). Hence, everything works. So, I think that it should be
> fixed only for ARM. Anyway, please CC me when you send a patch.

This thread already a fix for ARM64. So do I need to resend a patch with 
x86 fixed or not?

Cheers,

-- 
Julien Grall