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

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Message-ID: <20170418134650.GL24360@codeblueprint.co.uk>
Date:   Tue, 18 Apr 2017 14:46:50 +0100
From:   Matt Fleming <matt@...eblueprint.co.uk>
To:     Mark Rutland <mark.rutland@....com>
Cc:     Julien Grall <julien.grall@....com>,
        Daniel Kiper <daniel.kiper@...cle.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 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.

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