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

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On 29/06/16 10:16, Vitaly Kuznetsov wrote:
> David Vrabel <david.vrabel@citrix.com> writes:
> 
>> 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?
>>
> 
> In theory, yes, I think we can re-arrange vCPUs inside the hypervisor so
> Linux will get them in the natural order after soft reset.

The series is straight forwards and the concept of the guest having to
map its idea of CPU to VCPU is fine, so unless you think a hypervisor
based solution is better we can take this series once it's fixed up.

David

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[PATCH linux 0/8] xen: pvhvm: support bootup on secondary vCPUs Vitaly Kuznetsov <vkuznets@redhat.com> - 2016-06-28 18:50 +0200
  [PATCH linux 5/8] xen/events: use xen_vcpu_id mapping in events_base Vitaly Kuznetsov <vkuznets@redhat.com> - 2016-06-28 19:00 +0200
  [PATCH linux 7/8] xen/evtchn: use xen_vcpu_id mapping Vitaly Kuznetsov <vkuznets@redhat.com> - 2016-06-28 19:00 +0200
  [PATCH linux 4/8] x86/xen: use xen_vcpu_id mapping when pointing vcpu_info to the shared_info page Vitaly Kuznetsov <vkuznets@redhat.com> - 2016-06-28 19:00 +0200
    Re: [Xen-devel] [PATCH linux 4/8] x86/xen: use xen_vcpu_id mapping  when pointing vcpu_info to the shared_info page David Vrabel <david.vrabel@citrix.com> - 2016-06-29 14:40 +0200
  [PATCH linux 8/8] xen/pvhvm: run xen_vcpu_setup() for the boot CPU Vitaly Kuznetsov <vkuznets@redhat.com> - 2016-06-28 19:00 +0200
  [PATCH linux 6/8] xen/events: fifo: use xen_vcpu_id mapping Vitaly Kuznetsov <vkuznets@redhat.com> - 2016-06-28 19:00 +0200
  Re: [PATCH linux 0/8] xen: pvhvm: support bootup on secondary vCPUs David Vrabel <david.vrabel@citrix.com> - 2016-06-28 19:40 +0200
    Re: [PATCH linux 0/8] xen: pvhvm: support bootup on secondary vCPUs Vitaly Kuznetsov <vkuznets@redhat.com> - 2016-06-29 11:20 +0200
      Re: [PATCH linux 0/8] xen: pvhvm: support bootup on secondary vCPUs David Vrabel <david.vrabel@citrix.com> - 2016-06-29 14:40 +0200
        Re: [PATCH linux 0/8] xen: pvhvm: support bootup on secondary vCPUs Vitaly Kuznetsov <vkuznets@redhat.com> - 2016-07-01 11:50 +0200

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