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

From	Vitaly Kuznetsov <vkuznets@redhat.com>
Newsgroups	linux.kernel
Subject	Re: [Xen-devel] [PATCH linux v3 0/9] xen: pvhvm: support bootup on secondary vCPUs
Date	2016-07-27 11:20 +0200
Message-ID	<rZtaq-5SB-15@gated-at.bofh.it> (permalink)
References	<rZ9Oq-1Wx-11@gated-at.bofh.it> <rZahr-2lS-5@gated-at.bofh.it> <rZar8-2ps-5@gated-at.bofh.it> <rZeuK-4Z7-33@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

Stefano Stabellini <sstabellini@kernel.org> writes:

> On Tue, 26 Jul 2016, Vitaly Kuznetsov wrote:
>> David Vrabel <david.vrabel@citrix.com> writes:
>> 
>> > 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.
>> 
>> Ok,
>> 
>> in that case we can wait till the real mapping is done for ARM to change
>> the type of xen_vcpu_id I guess.
>
> It would still be nice to make the change. Please send it as an
> incremental patch. It is OK if it is queued for 4.9.

Sure, will do.

-- 
  Vitaly

Back to linux.kernel | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

[PATCH linux v3 0/9] xen: pvhvm: support bootup on secondary vCPUs Vitaly Kuznetsov <vkuznets@redhat.com> - 2016-07-26 14:40 +0200
  [PATCH linux v3 4/9] x86/xen: use xen_vcpu_id mapping for HYPERVISOR_vcpu_op Vitaly Kuznetsov <vkuznets@redhat.com> - 2016-07-26 14:40 +0200
  [PATCH linux v3 3/9] xen: introduce xen_vcpu_id mapping Vitaly Kuznetsov <vkuznets@redhat.com> - 2016-07-26 14:40 +0200
  [PATCH linux v3 6/9] xen/events: use xen_vcpu_id mapping in events_base Vitaly Kuznetsov <vkuznets@redhat.com> - 2016-07-26 14:40 +0200
  Re: [Xen-devel] [PATCH linux v3 0/9] xen: pvhvm: support bootup on  secondary vCPUs David Vrabel <david.vrabel@citrix.com> - 2016-07-26 15:10 +0200
    Re: [Xen-devel] [PATCH linux v3 0/9] xen: pvhvm: support bootup on secondary vCPUs Vitaly Kuznetsov <vkuznets@redhat.com> - 2016-07-26 15:20 +0200
      Re: [Xen-devel] [PATCH linux v3 0/9] xen: pvhvm: support bootup on  secondary vCPUs Stefano Stabellini <sstabellini@kernel.org> - 2016-07-26 19:40 +0200
        Re: [Xen-devel] [PATCH linux v3 0/9] xen: pvhvm: support bootup on secondary vCPUs Vitaly Kuznetsov <vkuznets@redhat.com> - 2016-07-27 11:20 +0200

csiph-web