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

Groups > linux.kernel > #1450598

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

Show all headers | View raw

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.

-- 
  Vitaly

Back to linux.kernel | Previous | Next — Previous in thread | Next 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