On 2025/08/08 06:44 PM, Cédric Le Goater wrote: > On 8/8/25 17:45, Amit Machhiwal wrote: > > Hi Cédric, > > > > Please find my comments inline: > > > > On 2025/08/08 03:49 PM, Cédric Le Goater wrote: > > > Hello Amit, > > > > > > On 8/7/25 11:34, Amit Machhiwal wrote: > > > > Hello, > > > > > > > > On 2025/08/04 12:44 PM, Alex Mastro wrote: > > > > > Print the PCI device syspath to a vfio device's fdinfo. This enables tools > > > > > to query which device is associated with a given vfio device fd. > > > > > > > > > > This results in output like below: > > > > > > > > > > $ cat /proc/"$SOME_PID"/fdinfo/"$VFIO_FD" | grep vfio > > > > > vfio-device-syspath: /sys/devices/pci0000:e0/0000:e0:01.1/0000:e1:00.0/0000:e2:05.0/0000:e8:00.0 > > > > > > > > > > Signed-off-by: Alex Mastro <amastro@xxxxxx> > > > > > > > > I tested this patch on a POWER9 bare metal system with a VFIO PCI device and > > > > could see the VFIO device syspath in fdinfo. > > > > > > POWER9 running on OPAL FW : I am curious about the software stack. > > > > > > I suppose this is the latest upstream kernel ? > > > > Yes, I used the latest upstream kernel and applied this patch on top of commit > > cca7a0aae895. > > > > > Are you using an upstream QEMU to test too ? > > > > No, I had used the Fedora 42 distro qemu. The version details are as below: > > > > [root@localhost ~]# qemu-system-ppc64 --version > > QEMU emulator version 9.2.4 (qemu-9.2.4-1.fc42) > > Copyright (c) 2003-2024 Fabrice Bellard and the QEMU Project developers > > > > I gave the upstream qemu (HEAD pointing to cd21ee5b27) a try and I see the same > > behavior with that too. > > > > [root@localhost ~]# ./qemu-system-ppc64 --version > > QEMU emulator version 10.0.92 (v10.1.0-rc2-4-gcd21ee5b27-dirty) > > Copyright (c) 2003-2025 Fabrice Bellard and the QEMU Project developers > > > > [root@localhost ~]# cat /proc/52807/fdinfo/191 > > pos: 0 > > flags: 02000002 > > mnt_id: 17 > > ino: 1125 > > vfio-device-syspath: /sys/devices/pci0031:00/0031:00:00.0/0031:01:00.0 > > > > > > > > and which device ? > > > > I'm using a Broadcom NetXtreme network card (4-port) and passing through its > > fn0. > > > > [root@guest ~]# lspci > > [...] > > 0001:00:01.0 Ethernet controller: Broadcom Inc. and subsidiaries NetXtreme BCM5719 Gigabit Ethernet PCIe (rev 01) > > > > Please let me know if I may help you with any additional information. > > It is good to know that device pass-through still works with upstream on > OpenPower servers. > > Have you tried VFs ? I didn't get a chance to try VFs yet, Cédric. > > Thanks Amit, No problem. :) Thanks, Amit > > C. >
