[Xen-devel] problems with pciback on 2.6.27 with xenclient patches

[Ben Garside <ben@xxxxxxxxxxxxxxxxxx>]

Hi, am not sure if this is the most appropriate place to post, so
excuse me if
it's not. I've been tearing my hair out (and there's not much left)
trying to
get pciback to work. I picked the xci based kernel (2.6.27 with the pq
patches
(using guilt) - summarised at http://xenbits.xensource.com/xenclient/)
as it
seems to have the best support for pciback (and ultimate goal of vga
passthrough) for a recent kernel. Compile was ok, XEN related kernel
parameters
are below. When I add the iommu=1 vtd=1  pciback.permissive 
pciback.hide=(00:1b.0) to the boot args, it looks like the card is
"seized",
only later to be released again - no mention of I/O virtualization
which I have
seen in logs of a few other people. Doing an lspci in Dom0 shows the
card as
normal. Have tried with a few different cards (this particular pci
device is
onboard sound). 

I have tried it with xen 3.40 (release) and with unstable (currently
3.5). My
machine is a Dell T5400 (xeon processor) and has all the vt-d options
enabled in
the bios. Oh one other thing I noticed is that if I put a spurious
(incorrect)
option as a boot arg, I don't get any warning that this is
unrecognised - have
also tried adding debug to the boot line, but it has no effect.

Any help much appreciated - this is driving me crazy!


Grub entry:
title Xen 3.4 Kernel 2.6.27.19-5.1
uuid 6724237b-5a56-4765-b3e0-21ce3d358ab3
kernel /xen-3.4.gz
module /vmlinuz-2.6.27.19-5.1  debug
root=/dev/mapper/VolGroup0-dom0_root ro
iommu=1 vtd=1 dom0_mem=512M pciback.permissive  pciback.hide=(00:1b.0)
console=tty0
module /initrd-2.6.27.19-5.1.img


Dmesg Entries:

[    0.522373] pciback: adding device ID type: 1 for 0000:00:1b.0
[    0.522470] pciback 0000:00:00.0: probing...
[    0.522554] pciback 0000:00:01.0: probing...
[    0.522633] pciback 0000:00:05.0: probing...
[    0.522713] pciback 0000:00:09.0: probing...
[    0.522794] pciback 0000:00:10.0: probing...
[    0.522875] pciback 0000:00:10.1: probing...
[    0.522956] pciback 0000:00:10.2: probing...
[    0.523037] pciback 0000:00:10.3: probing...
[    0.523118] pciback 0000:00:10.4: probing...
[    0.523199] pciback 0000:00:11.0: probing...
[    0.523280] pciback 0000:00:15.0: probing...
[    0.523361] pciback 0000:00:15.1: probing...
[    0.523442] pciback 0000:00:16.0: probing...
[    0.523523] pciback 0000:00:16.1: probing...
[    0.523604] pciback 0000:00:1b.0: probing...
[    0.523679] pciback 0000:00:1b.0: seizing device
[    0.523755] pciback 0000:00:1b.0: pcistub_device_alloc
[    0.523832] pciback 0000:00:1b.0: deferring initialization
[    0.523915] pciback 0000:00:1c.0: probing...
[    0.524067] pciback 0000:00:1d.0: probing...
[    0.524149] pciback 0000:00:1d.1: probing...

...
[    0.896278] pciback: pcistub_init_devices_late
[    0.896356] pciback 0000:00:1b.0: initializing...
[    0.896433] pciback 0000:00:1b.0: pcistub_dev_data_alloc
[    0.896511] pciback 0000:00:1b.0: initializing config
[    0.896586] pciback 0000:00:1b.0: initializing virtual
configuration space
[    0.896666] pciback 0000:00:1b.0: added config field at offset 0x04
[    0.896741] pciback 0000:00:1b.0: added config field at offset 0x3c
[    0.896817] pciback 0000:00:1b.0: added config field at offset 0x3d
[    0.896893] pciback 0000:00:1b.0: added config field at offset 0x0c
[    0.896969] pciback 0000:00:1b.0: added config field at offset 0x0d
[    0.897044] pciback 0000:00:1b.0: added config field at offset 0x0f
[    0.897134] pciback 0000:00:1b.0: added config field at offset 0x10
[    0.897222] pciback 0000:00:1b.0: added config field at offset 0x14
[    0.897306] pciback 0000:00:1b.0: added config field at offset 0x18
[    0.897389] pciback 0000:00:1b.0: added config field at offset 0x1c
[    0.897472] pciback 0000:00:1b.0: added config field at offset 0x20
[    0.897556] pciback 0000:00:1b.0: added config field at offset 0x24
[    0.897639] pciback 0000:00:1b.0: added config field at offset 0x30
[    0.897736] pciback 0000:00:1b.0: Found capability 0x1 at 0x50
[    0.897812] pciback 0000:00:1b.0: added config field at offset 0x50
[    0.897888] pciback 0000:00:1b.0: added config field at offset 0x52
[    0.897966] pciback 0000:00:1b.0: added config field at offset 0x54
[    0.898052] pciback 0000:00:1b.0: added config field at offset 0x56
[    0.898128] pciback 0000:00:1b.0: added config field at offset 0x57
[    0.898204] pciback 0000:00:1b.0: enabling device
[    0.898290] pciback 0000:00:1b.0: reset device
[    0.932248] serio: i8042 KBD port at 0x60,0x64 irq 1
[    0.932353] serio: i8042 AUX port at 0x60,0x64 irq 12
[    0.948131] mice: PS/2 mouse device common for all mice




2.6.27 with patches compile args:
# CONFIG_X86_XEN is not set
CONFIG_X86_64_XEN=y
CONFIG_X86_XEN_GENAPIC=y
CONFIG_XEN_PCIDEV_FRONTEND=y
CONFIG_XEN_PCIDEV_FE_DEBUG=y
# CONFIG_INPUT_XEN is not set
# CONFIG_TCG_XEN is not set
CONFIG_XEN=y
CONFIG_XEN_INTERFACE_VERSION=0x00030207
# XEN
CONFIG_XEN_PRIVILEGED_GUEST=y
# CONFIG_XEN_UNPRIVILEGED_GUEST is not set
CONFIG_XEN_PRIVCMD=y
CONFIG_XEN_XENBUS_DEV=y
CONFIG_XEN_NETDEV_ACCEL_SFC_UTIL=m
CONFIG_XEN_BACKEND=y
CONFIG_XEN_BLKDEV_BACKEND=y
CONFIG_XEN_BLKDEV_TAP=y
CONFIG_XEN_NETDEV_BACKEND=y
# CONFIG_XEN_NETDEV_PIPELINED_TRANSMITTER is not set
CONFIG_XEN_NETDEV_LOOPBACK=m
CONFIG_XEN_PCIDEV_BACKEND=y
CONFIG_XEN_PCIDEV_BACKEND_VPCI=y
# CONFIG_XEN_PCIDEV_BACKEND_PASS is not set
# CONFIG_XEN_PCIDEV_BACKEND_SLOT is not set
# CONFIG_XEN_PCIDEV_BACKEND_CONTROLLER is not set
CONFIG_XEN_PCIDEV_BE_DEBUG=y
CONFIG_XEN_TPMDEV_BACKEND=y
CONFIG_XEN_SCSI_BACKEND=m
CONFIG_XEN_BLKDEV_FRONTEND=y
CONFIG_XEN_NETDEV_FRONTEND=y
CONFIG_XEN_NETDEV_ACCEL_SFC_FRONTEND=m
CONFIG_XEN_SCSI_FRONTEND=m
CONFIG_XEN_GRANT_DEV=y
CONFIG_XEN_FRAMEBUFFER=y
CONFIG_XEN_KEYBOARD=y
CONFIG_XEN_DISABLE_SERIAL=y
CONFIG_XEN_SYSFS=y
CONFIG_XEN_NR_GUEST_DEVICES=256
# CONFIG_XEN_COMPAT_030002_AND_LATER is not set
# CONFIG_XEN_COMPAT_030004_AND_LATER is not set
# CONFIG_XEN_COMPAT_030100_AND_LATER is not set
# CONFIG_XEN_COMPAT_030200_AND_LATER is not set
CONFIG_XEN_COMPAT_LATEST_ONLY=y
CONFIG_XEN_COMPAT=0xffffff
CONFIG_XEN_SMPBOOT=y
CONFIG_XEN_DEVMEM=y
CONFIG_XEN_BALLOON=y
CONFIG_XEN_SCRUB_PAGES=y
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