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Re: [PATCH 0/2] Drivers: hv: vmbus: make bus ids in sysfs persistent

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KY Srinivasan <kys@microsoft.com> writes:

>> -----Original Message-----
>> From: Vitaly Kuznetsov [mailto:vkuznets@redhat.com]
>> Sent: Tuesday, August 9, 2016 1:46 AM
>> To: devel@linuxdriverproject.org
>> Cc: linux-kernel@vger.kernel.org; Haiyang Zhang <haiyangz@microsoft.com>;
>> KY Srinivasan <kys@microsoft.com>
>> Subject: [PATCH 0/2] Drivers: hv: vmbus: make bus ids in sysfs persistent
>> 
>> Bus ids for VMBus devices in /sys/bus/vmbus/devices/ are not guaranteed
>> to be persistent across reboot or kernel restart and this causes problems
>> for some tools. E.g. kexec tools use these ids to identify NIC on kdump.
>> Fix the issue by using relid from channel offer as the unique id instead
>> of an auto incremented counter.
>
> Relids are not persistent. It is only valid between a channel offer
> message and a relid released message (or an unload or initiate contact
> message, which invalidates all channels). This is an opaque number
> that the root generates and uses to track channels. There is no
> guarantee that the same type of channel (networking, storage, etc)
> will get the same relid on each reboot.
>

Thanks for the info,

can we use device_id (offermsg.offer.if_instance.b) instead?

-- 
  Vitaly

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[PATCH 0/2] Drivers: hv: vmbus: make bus ids in sysfs persistent Vitaly Kuznetsov <vkuznets@redhat.com> - 2016-08-09 10:50 +0200
  [PATCH 2/2] Drivers: hv: get rid of id in struct vmbus_channel Vitaly Kuznetsov <vkuznets@redhat.com> - 2016-08-09 10:50 +0200
  RE: [PATCH 0/2] Drivers: hv: vmbus: make bus ids in sysfs persistent KY Srinivasan <kys@microsoft.com> - 2016-08-10 22:40 +0200
    Re: [PATCH 0/2] Drivers: hv: vmbus: make bus ids in sysfs persistent Vitaly Kuznetsov <vkuznets@redhat.com> - 2016-08-11 11:20 +0200
      RE: [PATCH 0/2] Drivers: hv: vmbus: make bus ids in sysfs persistent KY Srinivasan <kys@microsoft.com> - 2016-08-12 16:20 +0200
        Re: [PATCH 0/2] Drivers: hv: vmbus: make bus ids in sysfs persistent Vitaly Kuznetsov <vkuznets@redhat.com> - 2016-08-15 18:20 +0200
          RE: [PATCH 0/2] Drivers: hv: vmbus: make bus ids in sysfs persistent KY Srinivasan <kys@microsoft.com> - 2016-08-17 18:40 +0200

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