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

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Message-ID: <20170406142710.GE4372@olila.local.net-space.pl>
Date:   Thu, 6 Apr 2017 16:27:10 +0200
From:   Daniel Kiper <daniel.kiper@...cle.com>
To:     Julien Grall <julien.grall@....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

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.

Daniel