Re: [Xen-devel] Re: [vt-d][xen4-rc6] Hangs on startup

[Łukasz Oleś <lukaszoles@xxxxxxxxx>]

Hi,

2010/3/22 Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>:
> What is the version of Xen tools you have? Did you build them from
> xen-unstable?

Yes, there are from xen-unstable

>> "0000:00:1a.1">/sys/bus/pci/devices/0000:00:1a.1/driver/unbind
>> root@debian:~# echo "0000:00:1a.1">/sys/bus/pci/drivers/pci-stub/bind
>
> Where did you get the documentation for those steps? I would suggest you use
> the 'pciback' instead of 'pci-stub' module for this just to see if that
> makes the 'pciback' later error go away.

Well, I missread http://wiki.xensource.com/xenwiki/VTdHowTo  I
switched to pciback(I used
http://wiki.xensource.com/xenwiki/Assign_hardware_to_DomU_with_PCIBack_as_module)
 and this error no longer occurs.

> Uhh. So you assigned the device to 'pci-stub', and somehow 'pciback' gets
> involved. That is not good. PCI back is to be used _only_ with
> PV guests - you on the other hand are running an HVM guest.
>
> Per the earlier statement, I would recommend you use the 'pciback'
> instead of 'pci-stub' or just not compile pciback in and see what
> happens. Keep in mind: PCI back module is only needed when you want to do PV 
> PCI
> passthrough, which is not what you are doing.
>

Wiki says something else (http://wiki.xensource.com/xenwiki/VTdHowTo)
So pciback or pci-stub for HVM?
from wiki: "If using pv-ops dom0, also can use pci-stub to hide
devices for assignment"

>> [  733.248052] pciback pci-3-0: 22 Couldn't locate PCI device
>> (0000:00:1a.0)! perhaps already in-use?
>
> Can you paste your 'xenstore-ls /local/domain/0' output when this
> happening?

When using pci-stub:

xenstore-ls /local/domain/0
vm = "/vm/00000000-0000-0000-0000-000000000000"
device = ""
control = ""
 platform-feature-multiprocessor-suspend = "1"
error = ""
 backend = ""
  pci = ""
   1 = ""
    0 = ""
     error = "22 Couldn't locate PCI device (0000:01:01.0)! perhaps
already in-use?"
memory = ""
 target = "1017632"
guest = ""
hvmpv = ""
data = ""
cpu = ""
 1 = ""
  availability = "online"
 0 = ""
  availability = "online"
description = ""
console = ""
 limit = "1048576"
 type = "xenconsoled"
domid = "0"
name = "Domain-0"
device-model = ""
 1 = ""
  disable_pf = "0"
  state = "running"
  parameter = "0x20"
backend = ""
 vfb = ""
  1 = ""
   0 = ""
    vncunused = "1"
    domain = "ExampleHVMDomain"
    vnc = "1"
    uuid = "e4f967e1-9ab9-6170-9392-711b7eee638d"
    vnclisten = "0.0.0.0"
    frontend = "/local/domain/1/device/vfb/0"
    state = "1"
    online = "1"
    frontend-id = "1"
    location = "0.0.0.0:5900"
 vbd = ""
  1 = ""
   768 = ""
    domain = "ExampleHVMDomain"
    frontend = "/local/domain/1/device/vbd/768"
    uuid = "f51680ce-7057-ed25-3a4f-aacd78e5f2b5"
    bootable = "1"
    dev = "hda"
    state = "2"
    params = "/media/debian.img"
    mode = "w"
    online = "1"
    frontend-id = "1"
    type = "file"
    node = "/dev/loop1"
    physical-device = "7:1"
    hotplug-status = "connected"
   5632 = ""
    domain = "ExampleHVMDomain"
    frontend = "/local/domain/1/device/vbd/5632"
    uuid = "44367e07-409f-d676-9047-d84b1f2189e2"
    bootable = "0"
    dev = "hdc"
    state = "2"
    params = "/media/debian.iso"
    mode = "r"
    online = "1"
    frontend-id = "1"
    type = "file"
    node = "/dev/loop2"
    physical-device = "7:2"
    hotplug-status = "connected"
 pci = ""
  1 = ""
   0 = ""
    domain = "ExampleHVMDomain"
    key-0 = "01:01.0"
    vdevfn-0 = "20"
    uuid = "01ad7a64-bf43-b782-b4ad-bbcb9060c36a"
    dev-0 = "0000:01:01.0"
    frontend = "/local/domain/1/device/pci/0"
    state = "7"
    online = "1"
    frontend-id = "1"
    opts-0 = "msitranslate=1,power_mgmt=0"
    uuid-0 = "9db6e99f-31c4-8a7a-96c4-dd88e130abbe"
    num_devs = "1"
    state-0 = "1"
 console = ""
  1 = ""
   0 = ""
    domain = "ExampleHVMDomain"
    protocol = "vt100"
    uuid = "ae8d643f-cd4d-2256-2f55-c79736f96311"
    frontend = "/local/domain/1/device/console/0"
    state = "1"
    location = "3"
    online = "1"
    frontend-id = "1"

>> (XEN) mm.c:859:d1 Error getting mfn 40004 (pfn 5555555555555555) from
>> L1 entry 0000000040004037 for l1e_owner=1, pg_owner=1
>> ...
>> And guest never starts.  Perhaps this is related to the firmware which
>> is used by qla2xxx?
>
> So you see this _only_ when you pass in QLA2XXX card, right? When you
> don't pass in a PCI card, you don't see this, correct?

Exactly. This happens with both pciback and pci-stub.

Regards,
Łukasz Oleś

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