Messages in this thread | | | Date | Fri, 18 Sep 2020 10:49:06 +0200 | From | Gerd Hoffmann <> | Subject | Re: [PATCH v2 0/3] KVM: x86: KVM_MEM_PCI_HOLE memory |
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Hi,
> I see a similar ~8k PCI hole reads with a -kernel boot w/ OVMF. All but 60 > of those are from pcibios_fixup_peer_bridges(), and all are from the kernel.
pcibios_fixup_peer_bridges() looks at pcibios_last_bus, and that in turn seems to be set according to the mmconfig size (in arch/x86/pci/mmconfig-shared.c).
So, maybe we just need to declare a smaller mmconfig window in the acpi tables, depending on the number of pci busses actually used ...
> If all of the above is true, this can be handled by adding "pci=lastbus=0"
... so we don't need manual quirks like this?
take care, Gerd
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