Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1433599

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

Show all headers | View raw

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.

-- 
  Vitaly

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

Thread

[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

csiph-web