> >I was asking this because the PF driver should reset the PF while the VF are > >used by VFIO/QEMU when the PF doesn't respond anymore. > > > What your VF does while your PF is being reset is PF (& VF) dependent. > A 'good design' would not impact the VF operation, other than to stall it > until > the PF completed reset. My experience, though, is that the PF has to be > brought > up to some level of functionality to share the physical resources with the > VFs.
When the PF does an FLR the hardware go back to its default state, the SR-IOV configuration is gone and the VFs disappears from the bus. Then the restore state function of the kernel reset code would bring the SR-IOV PF configuration back. The hardware also have a privately owned SR-IOV related configuration in the PF configuration space. This configuration is used to configure the VFs resources. (memory) Best regards Benoît Canet _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
