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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