linux-kernel - Re: [PATCH linux 0/8] xen: pvhvm: support bootup on secondary vCPUs

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Message-ID: <5772B4C2.4010906@citrix.com>
Date:	Tue, 28 Jun 2016 18:32:50 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Vitaly Kuznetsov <vkuznets@...hat.com>,
	<xen-devel@...ts.xenproject.org>
CC:	<linux-kernel@...r.kernel.org>, <x86@...nel.org>,
	Stefano Stabellini <sstabellini@...nel.org>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Juergen Gross <jgross@...e.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Ingo Molnar" <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	Julien Grall <julien.grall@...rix.com>
Subject: Re: [PATCH linux 0/8] xen: pvhvm: support bootup on secondary vCPUs

On 28/06/16 17:47, 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.

Could the soft-reboot hypercall (optionally) return on vcpu 0?

David