linux-kernel - Re: [Xen-devel] [PATCH linux v2 0/9] xen: pvhvm: support bootup on secondary vCPUs

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Message-ID: <alpine.DEB.2.10.1607251407270.12319@sstabellini-ThinkPad-X260>
Date:	Mon, 25 Jul 2016 14:16:26 -0700 (PDT)
From:	Stefano Stabellini <sstabellini@...nel.org>
To:	David Vrabel <david.vrabel@...rix.com>
cc:	Julien Grall <julien.grall@....com>,
	Vitaly Kuznetsov <vkuznets@...hat.com>,
	xen-devel@...ts.xenproject.org, Juergen Gross <jgross@...e.com>,
	Stefano Stabellini <sstabellini@...nel.org>,
	Andrew Cooper <andrew.cooper3@...rix.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Jan Beulich <JBeulich@...e.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [Xen-devel] [PATCH linux v2 0/9] xen: pvhvm: support bootup on
 secondary vCPUs

On Mon, 25 Jul 2016, David Vrabel wrote:
> 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.

That's OK, no worries. In the future it would be nice to wait a few more
hours, until morning PST.

Cheers,

Stefano