Hi VFIO users,
I am working with a PCIe card that supports up to 255 VFs. In order to
get the SR-IOV stuff to work I added some of the latest patches to the
vfio-pci driver.
I have two servers.
The first one is a Centos 8 based system with many cores and a Xeon E5
CPU. I enable VFIO with:
insmod /lib/modules/$(uname -r)/kernel/drivers/vfio/vfio.ko.xz
insmod /lib/modules/$(uname -r)/kernel/drivers/vfio/vfio_iommu_type1.ko.xz
insmod /lib/modules/$(uname -r)/kernel/drivers/vfio/vfio_virqfd.ko.xz
insmod /root/vfio-pci.ko enable_sriov=1 # The patched module
echo "$vendor $device" > /sys/bus/pci/drivers/vfio-pci/new_id
echo 15 > /sys/bus/pci/drivers/vfio-pci/*/sriov_numvfs
This works and I get a PF and 15 fully functional VFs.
My other server is also a Centos 8 based system but with an i7 CPU. The
motherboard is an Asrock Z370M Pro 4.
When I enable VFIO only the PF and the first 7 VFs are fully functional.
If I enter "lspci -s 01:00.1 -x" I get a nice dump of the config space
for VF0. But if I enter "lspci -s 01:01.0 -x" I get:
00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
10: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
20: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
30: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
My guess is that this is either due to a limitation in the PCI bridge or
a driver issue. What is causing this problem?
/Kjeld
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