> -----Original Message-----
> From: LKML haiyangz <[email protected]> On Behalf Of Haiyang
> Zhang
> Sent: Tuesday, August 6, 2019 7:52 PM
> To: [email protected]; [email protected]; [email protected];
> [email protected]; [email protected]
> Cc: Haiyang Zhang <[email protected]>; KY Srinivasan
> <[email protected]>; Stephen Hemminger <[email protected]>;
> [email protected]; vkuznets <[email protected]>; linux-
> [email protected]
> Subject: [PATCH v2] PCI: hv: Detect and fix Hyper-V PCI domain number
> collision
>
> Currently in Azure cloud, for passthrough devices including GPU, the
> host sets the device instance ID's bytes 8 - 15 to a value derived from
> the host HWID, which is the same on all devices in a VM. So, the device
> instance ID's bytes 8 and 9 provided by the host are no longer unique.
>
> This can cause device passthrough to VMs to fail because the bytes 8 and
> 9 is used as PCI domain number. So, as recommended by Azure host team,
> we now use the bytes 4 and 5 which usually contain unique numbers as PCI
> domain. The chance of collision is greatly reduced. In the rare cases of
> collision, we will detect and find another number that is not in use.
>
> Thanks to Michael Kelley <[email protected]> for proposing this idea.
>
> Signed-off-by: Haiyang Zhang <[email protected]>
> Acked-by: Sasha Levin <[email protected]>
> ---
> drivers/pci/controller/pci-hyperv.c | 92
Hi Lorenzo,
This patch has been updated based on Bjorn's comments. Do you have any further
comments? Could you take it from your tree?
Thanks,
- Haiyang
