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

[Christoph Kaminski <mangel@xxxxxx>]

it seems to be a problem with pv-grub. If I start it without pv-grub, 
directly with set kernel/ramdisk/extra options then it works...
any solutions for it?

On Sat, 24 Mar 2012 10:28:49 +0100, Christoph Kaminski wrote:
> 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

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxx
http://lists.xen.org/xen-users