diff options
| author | Haiyang Zhang <[email protected]> | 2019-08-15 17:01:45 +0000 |
|---|---|---|
| committer | Lorenzo Pieralisi <[email protected]> | 2019-09-10 12:14:08 +0100 |
| commit | f73f8a504e27959576a2f4d85182202561e426f2 (patch) | |
| tree | f592fefa590014df683cf9e2cac03a3da2c2986c | |
| parent | be700103efd1050808db1cf00e52c3a2837bf802 (diff) | |
PCI: hv: Use bytes 4 and 5 from instance ID as the PCI domain numbers
As recommended by Azure host team, the bytes 4, 5 have more uniqueness
(info entropy) than bytes 8, 9 so use them as the PCI domain numbers.
On older hosts, bytes 4, 5 can also be used -- no backward compatibility
issues are introduced and the chance of collision is greatly reduced.
In the rare cases of collision, the driver code detects and finds
another number that is not in use.
Suggested-by: Michael Kelley <[email protected]>
Signed-off-by: Haiyang Zhang <[email protected]>
Signed-off-by: Lorenzo Pieralisi <[email protected]>
Acked-by: Sasha Levin <[email protected]>
| -rw-r--r-- | drivers/pci/controller/pci-hyperv.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c index 4caa3388692a..3a56de6b2ec2 100644 --- a/drivers/pci/controller/pci-hyperv.c +++ b/drivers/pci/controller/pci-hyperv.c @@ -2590,7 +2590,7 @@ static int hv_pci_probe(struct hv_device *hdev, * (2) There will be no overlap between domains (after fixing possible * collisions) in the same VM. */ - dom_req = hdev->dev_instance.b[8] << 8 | hdev->dev_instance.b[9]; + dom_req = hdev->dev_instance.b[5] << 8 | hdev->dev_instance.b[4]; dom = hv_get_dom_num(dom_req); if (dom == HVPCI_DOM_INVALID) { |