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

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> -----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.

Regards,

K. Y
> 
> Vitaly Kuznetsov (2):
>   Drivers: hv: make VMBus bus ids persistent
>   Drivers: hv: get rid of id in struct vmbus_channel
> 
>  drivers/hv/channel_mgmt.c | 2 --
>  drivers/hv/vmbus_drv.c    | 2 +-
>  include/linux/hyperv.h    | 3 ---
>  3 files changed, 1 insertion(+), 6 deletions(-)
> 
> --
> 2.7.4

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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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