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Subject: Re: [Xen-devel] [PATCH linux v3 0/9] xen: pvhvm: support bootup on
 secondary vCPUs
To: Vitaly Kuznetsov <vkuznets@redhat.com>, <xen-devel@lists.xenproject.org>
References: <1469536228-29932-1-git-send-email-vkuznets@redhat.com>
CC: Juergen Gross <jgross@suse.com>,
        Stefano Stabellini <sstabellini@kernel.org>,
        Andrew Cooper <andrew.cooper3@citrix.com>, <x86@kernel.org>,
        <linux-kernel@vger.kernel.org>, Julien Grall <julien.grall@arm.com>,
        Ingo Molnar <mingo@redhat.com>, David Vrabel <david.vrabel@citrix.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>
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Date: Tue, 26 Jul 2016 14:02:59 +0100
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On 26/07/16 13:30, 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.
> 
> Changes since v2:
> - Use 'uint32_t' for xen_vcpu_id mapping [Julien Grall]
> - Rebased to linux-4.7

I already applied v2.  If you provide an incremental patch I can queue
it for 4.9.

David