[edk2-devel] uefi VM and IO window overlap issue

[Kallol Biswas [C]]

Hi,
    We have been observing an issue that IO BARs can't be claimed due to resource
conflict.

[    0.457693] pci 0000:00:1d.0: can't claim BAR 4 [io  0x92a0-0x92bf]: address conflict with PCI Bus 0000:01 [io  0x9000-0x9fff]
[    0.457705] pci 0000:00:1d.1: can't claim BAR 4 [io  0x9280-0x929f]: address conflict with PCI Bus 0000:01 [io  0x9000-0x9fff]
[    0.457715] pci 0000:00:1d.2: can't claim BAR 4 [io  0x9260-0x927f]: address conflict with PCI Bus 0000:01 [io  0x9000-0x9fff]
[    0.457743] pci 0000:00:1f.2: can't claim BAR 4 [io  0x9240-0x925f]: address conflict with PCI Bus 0000:01 [io  0x9000-0x9fff]
[    0.457754] pci 0000:00:1f.3: can't claim BAR 4 [io  0x9200-0x923f]: address conflict with PCI Bus 0000:01 [io  0x9000-0x9fff]


Please see the discussion thread:

https://www.spinics.net/lists/linux-pci/msg133740.html

The root of the problem is that OVMF does not take into account the limit register's granularity (limit) of a bridge,
and programs EPs with overlapping IO ranges in a different bus.

Should we fix the issue in the OVMF?

Thanks,
Kallol


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