Hi Bodong, On Wed, Mar 22, 2017 at 05:53:58PM +0200, bodong@xxxxxxxxxxxx wrote: > From: Bodong Wang <bodong@xxxxxxxxxxxx> > > Sometimes it is not desirable to probe the virtual functions after > SRIOV is enabled. This can save host side resource usage by VF > instances which would be eventually probed to VMs. > > Add a new PCI sysfs interface "sriov_probe_vfs" to control that > from the PF, all current callers still retain the same functionality. > To modify it, echo 0/n/N (disable probe) or 1/y/Y (enable probe) to > > /sys/bus/pci/devices/<DOMAIN:BUS:DEVICE.FUNCTION>/sriov_probe_vfs Is this basically the same functionality as /sys/bus/pci/drivers_autoprobe, but limited to a specific PF? I.e., could we accomplish the same thing with the following? # echo 0 > /sys/bus/pci/devices/DDDD:BB:dd.f/sriov_numvfs # echo 0 > /sys/bus/pci/drivers_autoprobe # echo 2 > /sys/bus/pci/devices/DDDD:BB:dd.f/sriov_numvfs # echo 1 > /sys/bus/pci/drivers_autoprobe If not, can you contrast the above with drivers_autoprobe? If we need both, should they be named more similarly? > Note that, the choice must be made before enabling VFs. The change > will not take effect if VFs are already enabled. Simply, one can set > sriov_numvfs to 0, choose whether to probe or not, and then resume > sriov_numvfs. > > Signed-off-by: Bodong Wang <bodong@xxxxxxxxxxxx> > Signed-off-by: Eli Cohen <eli@xxxxxxxxxxxx> > Reviewed-by: Gavin Shan <gwshan@xxxxxxxxxxxxxxxxxx>
