PCI: hv: Detect and fix Hyper-V PCI domain number collision

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Currently in Azure cloud, for passthrough devices, 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 affects
all Azure hosts since July 2018, and can cause device passthrough to VMs
to fail because the bytes 8 and 9 are used as PCI domain number.
Collision of domain numbers will cause the second device with the same
domain number fail to load.

In the cases of collision, we will detect and find another number that is
not in use.

Suggested-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Sasha Levin <sashal@kernel.org>

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Haiyang Zhang 2019-08-15 17:01:37 +00:00 • committed by Lorenzo Pieralisi

parent f58ba5e3f6

commit be700103ef

1 changed files with 79 additions and 13 deletions

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drivers/pci/controller/pci-hyperv.c

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