Hi there,

After updating a server from CentOS 5.3 to 5.4 my Xen pci-passthru setup has some troubles.

The server has two NICs, one used by dom0 and the other assigned to a domU and one SCSI controler assigned to another domU. It has been working fine since CentOS 5.1, when I did the initial setup.

After upgrading to 5.4, I get this error when starting the domU with one of the NICs assigned:

Error: pci: improper device assignment specified: pci: 0000:07:00.0 must be co-assigned to the same guest with 0000:07:00.1, but it is not owned by pciback.

On the other hand, the domU with the SCSI controler boots, but the driver inside the domU prints a lot of awful errors and does not work.

I've booted the domU with the SCSI controller using the -128.7.1 kernel and everything works fine as before -164.6.1.

Any clues on why I can't assign just one NIC to the domU anymore?

# ls -l /sys/bus/pci/drivers/pciback/ total 0 lrwxrwxrwx 1 root root 0 Nov 10 09:55 0000:07:00.1 -> ../../../../devices/pci0000:00/0000:00:02.0/0000:01:00.0/0000:02:02.0/0000:07:00.1 lrwxrwxrwx 1 root root 0 Nov 10 09:55 0000:08:03.0 -> ../../../../devices/pci0000:00/0000:00:02.0/0000:01:00.3/0000:08:03.0 --w------- 1 root root 4096 Nov 10 09:55 bind lrwxrwxrwx 1 root root 0 Nov 10 09:55 module -> ../../../../module/pciback --w------- 1 root root 4096 Nov 10 09:55 new_id --w------- 1 root root 4096 Nov 10 09:55 new_slot -rw------- 1 root root 0 Nov 10 08:35 permissive -rw------- 1 root root 0 Nov 10 08:35 quirks --w------- 1 root root 4096 Nov 10 09:55 remove_id --w------- 1 root root 4096 Nov 10 09:55 remove_slot -r-------- 1 root root 4096 Nov 10 09:55 slots --w------- 1 root root 4096 Nov 10 09:55 unbind

# Script do create the initrds KVER="2.6.18-164.6.1.el5xen"

mkinitrd -f --omit-scsi-modules --omit-raid-modules \ --with=e1000e --with=xennet --with=xenblk \ --preload=xenblk /boot/initrd-$KVER-domU.img $KVER

mkinitrd -f --preload=pciback /boot/initrd-$KVER.img $KVER

# cat /etc/modprobe.conf alias eth0 e1000e options netloop nloopbacks=0 options pciback hide=(0000:07:00.1)(0000:08:03.0) alias scsi_hostadapter2 megaraid_sas # this is the RAID controller alias scsi_hostadapter3 ata_piix

# lspci |egrep "(Ether|SCSI)" 07:00.0 Ethernet controller: Intel Corporation 80003ES2LAN Gigabit Ethernet Controller (Copper) (rev 01) 07:00.1 Ethernet controller: Intel Corporation 80003ES2LAN Gigabit Ethernet Controller (Copper) (rev 01) 08:03.0 SCSI storage controller: LSI Logic / Symbios Logic 53c1030 PCI-X Fusion-MPT Dual Ultra320 SCSI (rev 08)

# uname -a Linux salvador.ic.unicamp.br 2.6.18-164.6.1.el5xen #1 SMP Tue Nov 3 16:48:13 EST 2009 x86_64 x86_64 x86_64 GNU/Linux

# domU-with-NIC.cfg kernel = "/boot/vmlinuz-2.6.18-164.6.1.el5xen" ramdisk = "/boot/initrd-2.6.18-164.6.1.el5xen-domU.img" memory = "4096" name = "taquaral" disk = ['phy:/dev/volumes/taquaral-root,xvda1,w', 'phy:/dev/volumes/taquaral-home,xvda2,w', 'phy:/dev/volumes/taquaral-home-staff,xvda3,w', 'phy:/dev/volumes/taquaral-home-adm,xvda4,w', 'phy:/dev/volumes/taquaral-home-admsis,xvda5,w', 'phy:/dev/volumes/taquaral-home-phd,xvda6,w', 'phy:/dev/volumes/taquaral-home-spec,xvda9,w', 'phy:/dev/volumes/taquaral-swap,xvda7,w', 'phy:/dev/volumes/taquaral-var,xvda8,w'] vif = ['mac=00:16:3e:57:13:a5, bridge=vlan0'] vcpus = 4 extra = "console=xvc0" root = "/dev/xvda1" pci = ["0000:07:00.1"]

# domU-with-SCSI.cfg kernel = "/boot/vmlinuz-2.6.18-128.7.1.el5xen" ramdisk = "/boot/initrd-2.6.18-128.7.1.el5xen-domU.img" memory = "2048" name = "flamboyant" disk = ['phy:/dev/volumes/flamboyant-root,xvda1,w', 'phy:/dev/volumes/flamboyant-var,xvda2,w', 'phy:/dev/volumes/flamboyant-l,xvda3,w', 'phy:/dev/volumes/flamboyant-swap,xvda4,w'] vif = ['mac=00:16:e3:55:55:55, bridge=br0', 'mac=00:16:3e:55:55:10, bridge=vlan0'] vcpus = 2 extra = "console=xvc0" root = "/dev/xvda1" pci = ["0000:08:03.0"]

# menu.lst title CentOS (2.6.18-164.6.1.el5xen) root (hd0,0) kernel /xen.gz-2.6.18-164.6.1.el5 dom0_mem=1G module /vmlinuz-2.6.18-164.6.1.el5xen ro root=LABEL=/ enforcing=0 module /initrd-2.6.18-164.6.1.el5xen.img