RE: [PATCH] PCI: hv: Detect and fix Hyper-V PCI domain number collision

[Dexuan Cui]

> From: linux-hyperv-owner@xxxxxxxxxxxxxxx
> Sent: Sunday, May 19, 2019 3:29 PM
> 
> Due to Azure host agent settings, the device instance ID's bytes 8 and 9
> are no longer unique. This causes some of the PCI devices not showing up
> in VMs with multiple passthrough devices, such as GPUs. So, as recommended
> by Azure host team, we now use the bytes 4 and 5 which usually provide
> unique numbers.
> 
> In the rare cases of collision, we will detect and find another number
> that is not in use.
> Thanks to Michael Kelley <mikelley@xxxxxxxxxxxxx> for proposing this idea.
> 
> Signed-off-by: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>

The patch looks good to me.

Reviewed-by: Dexuan Cui <decui@xxxxxxxxxxxxx>