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Subject: Re: [Xen-devel] [PATCH linux v2 0/9] xen: pvhvm: support bootup on
 secondary vCPUs
To: Julien Grall <julien.grall@arm.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        <xen-devel@lists.xenproject.org>
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CC: Juergen Gross <jgross@suse.com>,
        Stefano Stabellini <sstabellini@kernel.org>,
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        <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@redhat.com>,
        Jan Beulich <JBeulich@suse.com>, "H. Peter Anvin" <hpa@zytor.com>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        "Thomas Gleixner" <tglx@linutronix.de>
From: David Vrabel <david.vrabel@citrix.com>
Message-ID: <57961770.1080406@citrix.com>
Date: Mon, 25 Jul 2016 14:43:12 +0100
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On 25/07/16 14:17, Julien Grall wrote:
> Hi David,
> 
> On 25/07/16 13:38, David Vrabel wrote:
>> On 30/06/16 16:56, Vitaly Kuznetsov wrote:
>>> It may happen that Xen's and Linux's ideas of vCPU id diverge. In
>>> particular, when we crash on a secondary vCPU we may want to do kdump
>>> and unlike plain kexec where we do migrate_to_reboot_cpu() we try
>>> booting
>>> on the vCPU which crashed. This doesn't work very well for PVHVM
>>> guests as
>>> we have a number of hypercalls where we pass vCPU id as a parameter.
>>> These
>>> hypercalls either fail or do something unexpected. To solve the issue we
>>> need to have a mapping between Linux's and Xen's vCPU ids.
>>>
>>> This series solves the issue for x86 PVHVM guests. PV guests don't (and
>>> probably won't) support kdump so I always assume Xen's vCPU id ==
>>> Linux's
>>> vCPU id. ARM guests will probably need to get proper mapping once we
>>> start
>>> supporting kexec/kdump there.
>>
>> Applied to for-linus-4.8, thanks.
> 
> It would have been nice to send a ping before applying. This patch
> series is containing Xen ARM code which has not been acked by Stefano,
> nor had feedback from ARM side.

The ARM parts are trivial and such a small part of this series, I saw no
need to wait.

David