> > Hi, > > > > I'd say the risk for regressions is rather low, though, given that it > > > only affects configurations that would fail PCI resource allocation > > > today. Or am I missing something? > > > > > > In any case, the PCIe spec is clear about this: I/O space is optional, > > > and we need to incorporate this into the generic code at *some* point. > > > It makes no sense for every individual platform to keep adding these > > > hacks. > > Do you know how Linux handles this? > > Can Linux allocate resource for PCI(E) devices? How does it deal with the > > IO type? > > Yes. Details depend a bit on the specific configuration, but in general > linux will try assign io address space to pcie root ports and devices > plugged into those ports. A failure is not considered fatal though.
An error message and continue? > > A more common case than the pci root bridge not supporting io address > space at all is having more than 16 pcie root ports. Given io bride > windows are 1k in size and we have 16k total there is simply not enough > io address space in that case, so some of the root ports stay without > io and linux is fine with that. Does it have some certain policy that IO resource for first root bridge should be satisfied? > > > Why changing the MdeModulePkg's IncompatiblePciDevice driver can avoid > > stalling the patch series? > > I feel it's enough to just change the OvmfPkg version. > > It's not much of a problem for ovmf even without such an update, > typically the devices used with microvm don't have io bars in the first > place. > > Also note that without this series pcie devices are not supported at all > on microvm, so not supporting all devices initially wouldn't be a > regression. > > I'll look into it in any case. The safest way is to change OVMF now. Add @Nong, Foster and @Albecki, Mateusz for comments. > > take care, > Gerd > > > > > -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#89392): https://edk2.groups.io/g/devel/message/89392 Mute This Topic: https://groups.io/mt/90623478/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
