Thanks a lot for the answer. Best regards Benoît > Le Sunday 02 Jun 2013 à 08:11:42 (-0600), Alex Williamson a écrit : > On Sat, 2013-06-01 at 14:13 +0200, Benoît Canet wrote: > > Hello, > > > > I may have soon the PF driver of an SR-IOV card to code and make work with > > QEMU/KVM so I have the following questions. > > > > In an AMD64 setup where QEMU use VFIO to passthrough the VFs of an SR-IOV card > > to a guest will the consequences of a PF FLR be handled fine by QEMU and the > > guest ? > > > > I read that pci_reset_function would call pci_restore_state restoring the SR-IOV > > configuration after the reset of the PF. > > > > The ways the hardware work means that the VFs would disappear and reappear in a > > short lapse of time. > > > > Will these events be handled by the kernel pci hotplug code ? > > > > Given that the PF driver restore the PF config space after the reset will /sys > > files used by QEMU disappear and reappear messing the QEMU VFIO passthrough or > > will it goes smoothly ? > > On an Intel 82576 SR-IOV NIC, a FLR of the PF does not cause the VFs to > be removed. It's not clear to me that they continue working across the > reset, but there is no hotplug. If there was a hotplug, vfio-pci won't > release the device while it's in use, so the hotplug would be blocked > until the devices becomes unused, such as from the VM being shutdown. > Thanks, > > Alex > > -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
