[Xen-users] Problems centos6/xen/pci passthrough

[Christoph Kaminski <mangel@xxxxxx>]

Hi All

I have a problem with xen and pci passthrough...
I have centos 6 with xen here. Xen Pkgs from http://www.crc.id.au/
Kernel Pkgs from http://elrepo.org/tiki/kernel-ml 
(3.3.0-1.el6.elrepo.x86_64) in dom0/U.
I hide the PCI ID's with kernel parameter: 
'xen-pciback.hide=(08:02.0)(08:02.1)' and load after boot the backend 
module with: 'modprobe xen-pciback'
'll /sys/module/xen_pciback/drivers/pci\:pciback/' shows:

lrwxrwxrwx 1 root root    0 Mar 24 10:20 0000:08:02.0 -> 
../../../../devices/pci0000:00/0000:00:1e.0/0000:08:02.0
lrwxrwxrwx 1 root root    0 Mar 24 10:20 0000:08:02.1 -> 
../../../../devices/pci0000:00/0000:00:1e.0/0000:08:02.1
--w------- 1 root root 4096 Mar 24 10:20 bind
-r-------- 1 root root 4096 Mar 24 10:20 irq_handlers
--w------- 1 root root 4096 Mar 24 10:20 irq_handler_state
lrwxrwxrwx 1 root root    0 Mar 24 10:20 module -> 
../../../../module/xen_pciback
--w------- 1 root root 4096 Mar 24 10:20 new_id
--w------- 1 root root 4096 Mar 24 10:20 new_slot
-rw------- 1 root root 4096 Mar 24 10:20 permissive
-rw------- 1 root root 4096 Mar 24 10:20 quirks
--w------- 1 root root 4096 Mar 24 10:20 remove_id
--w------- 1 root root 4096 Mar 24 10:20 remove_slot
-r-------- 1 root root 4096 Mar 24 10:20 slots
--w------- 1 root root 4096 Mar 24 10:20 uevent
--w------- 1 root root 4096 Mar 24 10:20 unbind

but with 'xm pci-list-assignable-devices' I see no output :/

I have configured the domU with: 'pci = [ '08:02.0', '08:02.1' ]' and I 
see this if I create the domU:
Using config file "/etc/xen/furfur.cfg".
Started domain furfur (id=8)
                            Xen Minimal OS!
  start_info: 0xaa0000(VA)
    nr_pages: 0x20000
  shared_inf: 0xbcf60000(MA)
     pt_base: 0xaa3000(VA)
nr_pt_frames: 0x9
    mfn_list: 0x9a0000(VA)
   mod_start: 0x0(VA)
     mod_len: 0
       flags: 0x0
    cmd_line: (hd0)/boot/grub/grub.conf
  stack:      0x95f980-0x97f980
MM: Init
      _text: 0x0(VA)
     _etext: 0x6f9a4(VA)
   _erodata: 0x89000(VA)
     _edata: 0x91c60(VA)
stack start: 0x95f980(VA)
       _end: 0x99ff80(VA)
  start_pfn: aaf
    max_pfn: 20000
Mapping memory range 0xc00000 - 0x20000000
setting 0x0-0x89000 readonly
skipped 0x1000
MM: Initialise page allocator for ba9000(ba9000)-20000000(20000000)
MM: done
Demand map pfns at 20001000-2020001000.
Heap resides at 2020002000-4020002000.
Initialising timer interface
Initialising console ... done.
gnttab_table mapped at 0x20001000.
Initialising scheduler
Thread "Idle": pointer: 0x2020002050, stack: 0xcc0000
Initialising xenbus
Thread "xenstore": pointer: 0x2020002800, stack: 0xcd0000
Dummy main: start_info=0x97fa80
Thread "main": pointer: 0x2020002fb0, stack: 0xce0000
Thread "pcifront": pointer: 0x2020003760, stack: 0xcf0000
"main" "(hd0)/boot/grub/grub.conf"
pcifront_watches: waiting for backend path to appear 
device/pci/0/backend
vbd 51712 is hd0
******************* BLKFRONT for device/vbd/51712 **********


pcifront_watches: waiting for backend to get into the right state 
/local/domain/0/backend/pci/8/0
******************* PCIFRONT for device/pci/0 **********


backend at /local/domain/0/backend/vbd/8/51712
backend at /local/domain/0/backend/pci/8/0
10485760 sectors of 512 bytes
**************************
vbd 51728 is hd1
******************* BLKFRONT for device/vbd/51728 **********


**************************
pcifront_watches: waiting for backend events 
/local/domain/0/backend/pci/8/0/state
backend at /local/domain/0/backend/vbd/8/51728
2097152 sectors of 512 bytes
**************************
Thread "kbdfront": pointer: 0x2020131010, stack: 0xd00000
******************* FBFRONT for device/vfb/0 **********


******************* KBDFRONT for device/vkbd/0 **********


Failed to read device/vfb/0/backend-id.
Failed to read device/vkbd/0/backend-id.
error writing initialized: ENOENT

but after start it has no PCI support :( the xen-pcifront is compiled 
in:
grep -i xen /boot/config-3.3.0-1.el6.elrepo.x86_64
CONFIG_XEN=y
CONFIG_XEN_DOM0=y
CONFIG_XEN_PRIVILEGED_GUEST=y
CONFIG_XEN_PVHVM=y
CONFIG_XEN_MAX_DOMAIN_MEMORY=500
CONFIG_XEN_SAVE_RESTORE=y
# CONFIG_XEN_DEBUG_FS is not set
CONFIG_PCI_XEN=y
CONFIG_XEN_PCIDEV_FRONTEND=y
CONFIG_XEN_BLKDEV_FRONTEND=m
CONFIG_XEN_BLKDEV_BACKEND=m
CONFIG_NETXEN_NIC=m
CONFIG_XEN_NETDEV_FRONTEND=m
CONFIG_XEN_NETDEV_BACKEND=m
CONFIG_INPUT_XEN_KBDDEV_FRONTEND=y
CONFIG_HVC_XEN=y
CONFIG_XEN_WDT=m
CONFIG_XEN_FBDEV_FRONTEND=y
# Xen driver support
CONFIG_XEN_BALLOON=y
CONFIG_XEN_SELFBALLOONING=y
CONFIG_XEN_SCRUB_PAGES=y
CONFIG_XEN_DEV_EVTCHN=m
CONFIG_XEN_BACKEND=y
CONFIG_XENFS=m
CONFIG_XEN_COMPAT_XENFS=y
CONFIG_XEN_SYS_HYPERVISOR=y
CONFIG_XEN_XENBUS_FRONTEND=y
CONFIG_XEN_GNTDEV=m
CONFIG_XEN_GRANT_DEV_ALLOC=m
CONFIG_SWIOTLB_XEN=y
CONFIG_XEN_TMEM=y
CONFIG_XEN_PCIDEV_BACKEND=m
CONFIG_XEN_PRIVCMD=m

PCI output of domU dmesg:

dmesg | grep PCI
Allocating PCI resources starting at 20800000 (gap: 20800000:df800000)
PCI: setting up Xen PCI frontend stub
PCI: pci_cache_line_size set to 64 bytes
PCI: System does not support PCI
PCI: System does not support PCI
PCI: max bus depth: 0 pci_try_num: 1
PCI: CLS 0 bytes, default 64

what can be the problem? what can I do?

can someone help?

TiA

--
Greetz

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