Re: [Xen-devel] [PATCH linux v3 0/9] xen: pvhvm: support bootup on secondary vCPUs

From: David Vrabel
Date: Tue Jul 26 2016 - 09:03:12 EST

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.