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

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Message-ID: <20170419192906.GO16658@olila.local.net-space.pl>
Date:   Wed, 19 Apr 2017 21:29:06 +0200
From:   Daniel Kiper <daniel.kiper@...cle.com>
To:     Matt Fleming <matt@...eblueprint.co.uk>
Cc:     Mark Rutland <mark.rutland@....com>,
        Julien Grall <julien.grall@....com>,
        Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        sstabellini@...nel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, xen-devel@...ts.xen.org,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        linux-efi@...r.kernel.org
Subject: Re: [PATCH] arm64: xen: Implement EFI reset_system callback

On Tue, Apr 18, 2017 at 02:46:50PM +0100, Matt Fleming wrote:
> On Thu, 06 Apr, at 04:55:11PM, Mark Rutland wrote:
> >
> > Please, let's keep the Xen knowledge constrained to the Xen EFI wrapper,
> > rather than spreading it further.
> >
> > IMO, given reset_system is a *mandatory* function, the Xen wrapper
> > should provide an implementation.
> >
> > I don't see why you can't implement a wrapper that calls the usual Xen
> > poweroff/reset functions.
>
> I realise I'm making a sweeping generalisation, but adding
> EFI_PARAVIRT is almost always the wrong thing to do.

Why?

> I'd much prefer to see Mark's idea implemented.

If you wish I do not object.

Daniel