[Xen-devel] Support for PCI Express under Xen 3

["Adit Ranadive" <adit.262@xxxxxxxxx>]

Does Xen3 support creation of a pci back end for a PCI express bus?
I have tried to create domUs on a machine with PCI express but during
the creation it says "System does not support PCI".
Is there any special config/bridge to make PCI express work under xen?
Also, PCI express works under dom0 and this is the lspci command output in dom0:

00:00.0 Host bridge: Intel Corporation 955X Express Memory Controller Hub
00:01.0 PCI bridge: Intel Corporation 955X Express PCI Express Root Port
00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High
Definition Audio Controller (rev 01)
00:1c.0 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express
Port 1 (rev 01)
00:1c.4 PCI bridge: Intel Corporation 82801GR/GH/GHM (ICH7 Family) PCI
Express Port 5 (rev 01)
00:1c.5 PCI bridge: Intel Corporation 82801GR/GH/GHM (ICH7 Family) PCI
Express Port 6 (rev 01)
00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB
UHCI #1 (rev 01)
00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB
UHCI #2 (rev 01)
00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB
UHCI #3 (rev 01)
00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB
UHCI #4 (rev 01)
00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2
EHCI Controller (rev 01)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev e1)
00:1f.0 ISA bridge: Intel Corporation 82801GB/GR (ICH7 Family) LPC
Interface Bridge (rev 01)
00:1f.1 IDE interface: Intel Corporation 82801G (ICH7 Family) IDE
Controller (rev 01)
00:1f.2 IDE interface: Intel Corporation 82801GB/GR/GH (ICH7 Family)
Serial ATA Storage Controller IDE (rev 01)
00:1f.3 SMBus: Intel Corporation 82801G (ICH7 Family) SMBus Controller (rev 01)
01:00.0 VGA compatible controller: nVidia Corporation NV41GL [Quadro
FX 1400] (rev a2)
02:00.0 InfiniBand: Mellanox Technologies MT25208 InfiniHost III Ex
(Tavor compatibility mode) (rev a0)
04:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5751
Gigabit Ethernet PCI Express (rev 01)
05:02.0 FireWire (IEEE 1394): Agere Systems FW323 (rev 61)


Here is the entire output when the domU is created:

Using config file "/root/Desktop/ramdisk_novifixp".
Started domain vm2
Bootdata ok (command line is
ip=199.77.129.74:1.2.3.4:199.77.129.1:255.255.255.0:vm2:eth0:off
root=/dev/ram0 selinux=0 xencons=ttyS console=ttyS0)
Linux version 2.6.16-rc3-xen0 (root@xxxxxxxxxxxxxxxxxxxxx) (gcc
version 3.4.6 20060404 (Red Hat 3.4.6-3)) #1 Wed Nov 29 22:23:46 EST
2006
No mptable found.
Built 1 zonelists
Kernel command line:
ip=199.77.129.74:1.2.3.4:199.77.129.1:255.255.255.0:vm2:eth0:off
root=/dev/ram0 selinux=0 xencons=ttyS console=ttyS0
Initializing CPU#0
PID hash table entries: 2048 (order: 11, 65536 bytes)
Xen reported: 3191.998 MHz processor.
Dentry cache hash table entries: 65536 (order: 7, 524288 bytes)
Inode-cache hash table entries: 32768 (order: 6, 262144 bytes)
Software IO TLB disabled
Memory: 246256k/270336k available (3533k kernel code, 23732k reserved,
1383k data, 300k init)
Calibrating delay using timer specific routine.. 7982.62 BogoMIPS (lpj=15965259)
Mount-cache hash table entries: 256
CPU: Trace cache: 12K uops, L1 D cache: 16K
CPU: L2 cache: 1024K
CPU:               Intel(R) Pentium(R) D CPU 3.20GHz stepping 04
checking if image is initramfs...it isn't (bad gzip magic numbers);
looks like an initrd
Freeing initrd memory: 4096k freed
DMI 2.3 present.
Grant table initialized
NET: Registered protocol family 16
PCI: setting up Xen PCI frontend stub
ACPI: Subsystem revision 20060127
ACPI: Interpreter disabled.
xen_mem: Initialising balloon driver.
SCSI subsystem initialized
usbcore: registered new driver usbfs
usbcore: registered new driver hub
PCI: System does not support PCI
PCI: System does not support PCI
IA-32 Microcode Update Driver: v1.14-xen <tigran@xxxxxxxxxxx>
IA32 emulation $Id: sys_ia32.c,v 1.32 2002/03/24 13:02:28 ak Exp $
Initializing Cryptographic API
io scheduler noop registered
io scheduler anticipatory registered (default)
io scheduler deadline registered
io scheduler cfq registered
rtc: IRQ 8 is not free.
i8042.c: No controller found.
Floppy drive(s): fd0 is unknown type 15 (usb?), fd1 is unknown type 15 (usb?)
Failed to obtain physical IRQ 6
floppy0: no floppy controllers found
RAMDISK driver initialized: 16 RAM disks of 16384K size 1024 blocksize
loop: loaded (max 8 devices)
HP CISS Driver (v 2.6.10)
Intel(R) PRO/1000 Network Driver - version 6.3.9-k2
Copyright (c) 1999-2005 Intel Corporation.
pcnet32.c:v1.31c 01.Nov.2005 tsbogend@xxxxxxxxxxxxxxxx
e100: Intel(R) PRO/100 Network Driver, 3.5.10-k2-NAPI
e100: Copyright(c) 1999-2005 Intel Corporation
tun: Universal TUN/TAP device driver, 1.6
tun: (C) 1999-2004 Max Krasnyansky <maxk@xxxxxxxxxxxx>
Xen virtual console successfully installed as ttyS0
Event-channel device installed.
blkif_init: reqs=64, pages=704, mmap_vstart=0xffff88000f400000
netfront: Initialising virtual ethernet driver.
Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 50MHz system bus speed for PIO modes; override with idebus=xx
Adaptec aacraid driver (1.1-4 Nov 29 2006 22:22:17)
3ware Storage Controller device driver for Linux v1.26.02.001.
Fusion MPT base driver 3.03.07
Copyright (c) 1999-2005 LSI Logic Corporation
Fusion MPT SPI Host driver 3.03.07
usbmon: debugfs is not available
USB Universal Host Controller Interface driver v2.3
usbcore: registered new driver usbhid
drivers/usb/input/hid-core.c: v2.6:USB HID core driver
mice: PS/2 mouse device common for all mice
md: linear personality registered for level -1
md: raid0 personality registered for level 0
md: raid1 personality registered for level 1
md: multipath personality registered for level -4
md: md driver 0.90.3 MAX_MD_DEVS=256, MD_SB_DISKS=27
md: bitmap version 4.39
device-mapper: 4.5.0-ioctl (2005-10-04) initialised: dm-devel@xxxxxxxxxx
device-mapper: dm-multipath version 1.0.4 loaded
device-mapper: dm-round-robin version 1.0.0 loaded
device-mapper: dm-emc version 0.0.3 loaded
NET: Registered protocol family 2
IP route cache hash table entries: 4096 (order: 3, 32768 bytes)
TCP established hash table entries: 16384 (order: 5, 131072 bytes)
TCP bind hash table entries: 16384 (order: 5, 131072 bytes)
TCP: Hash tables configured (established 16384 bind 16384)
TCP reno registered
TCP bic registered
NET: Registered protocol family 1
NET: Registered protocol family 17
Bridge firewalling registered
IP-Config: Complete:
     device=eth0, addr=199.77.129.74, mask=255.255.255.0, gw=199.77.129.1,
    host=vm2, domain=, nis-domain=(none),
    bootserver=1.2.3.4, rootserver=1.2.3.4, rootpath=
md: Autodetecting RAID arrays.
md: autorun ...
md: ... autorun DONE.
RAMDISK: ext2 filesystem found at block 0
RAMDISK: Loading 4096KiB [1 disk] into ram disk... done.
EXT2-fs warning: maximal mount count reached, running e2fsck is recommended
VFS: Mounted root (ext2 filesystem).
cat: */class: No such file or directory
cat: */vendor: No such file or directory
cat: */device: No such file or directory
cat: */subsystem_vendor: No such file or directory
cat: */subsystem_device: No such file or directory
arguments (pci) env (PCI_SLOT_NAME=:.
USER=root
selinux=0
DEBUG=yes
ACTION=add
PCI_SLOT=0:0.0
OLDPWD=/sys/bus/pci/devices
HOME=/
TERM=linux
PCI_SUBSYS_ID=:
PCI_CLASS=
PCI_ID=:
PATH=/bin:/sbin:/usr/sbin:/usr/bin
SHELL=/bin/sh
PWD=/etc/hotplug)
invoke /etc/hotplug/pci.agent ()
Bad PCI agent invocation

Thanks,
Adit

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