Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935312AbdDFOih (ORCPT ); Thu, 6 Apr 2017 10:38:37 -0400 Received: from mx2.suse.de ([195.135.220.15]:50040 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755841AbdDFOi1 (ORCPT ); Thu, 6 Apr 2017 10:38:27 -0400 Subject: Re: [PATCH] arm64: xen: Implement EFI reset_system callback To: Daniel Kiper , Julien Grall References: <20170405181417.15985-1-julien.grall@arm.com> <3f6f5853-cd08-8afc-f71a-b0c1545c7564@arm.com> <20170406142710.GE4372@olila.local.net-space.pl> Cc: Boris Ostrovsky , xen-devel@lists.xen.org, sstabellini@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org From: Juergen Gross Message-ID: Date: Thu, 6 Apr 2017 16:38:24 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 In-Reply-To: <20170406142710.GE4372@olila.local.net-space.pl> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1417 Lines: 38 On 06/04/17 16:27, 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. What about xen_machine_power_off() (as stated in Boris' mail)? Juergen