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[Xen-users] HVM Assigning PCI Device

  • To: <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: "James Dingwall" <james.dingwall@xxxxxxxxxx>
  • Date: Thu, 15 May 2008 15:42:54 +0100
  • Delivery-date: Fri, 23 May 2008 08:32:17 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: Aci2mfU4xQPHVvvkT2i6AUC3DGURng==
  • Thread-topic: HVM Assigning PCI Device


I'm having some problems assigning a PCI device to an OpenBSD HVM.  The
HVM will boot without the pci = line in the configuration but as soon as
it is added I get:

# xm create hvm_obsd
Using config file "/etc/xen/hvm_obsd".
Error: Fail to assign device(1:0.0): maybe VT-d is not enabled, or the
device is not exist, or it has already been assigned to other domain

My system is running Gentoo using the 2.6.21-xen kernel and Xen 3.2.1.
I believe that the hardware I am using should support VT-d - a Gigabyte
GA-G33M-S2 (i.e. Intel G33 chipset) and a Core 2 Duo E8200 processor.  I
am also confident that the PCI device has been seized by the pciback

# dmesg | grep seizing
pciback 0000:01:00.0: seizing device
pciback 0000:02:00.0: seizing device
pciback 0000:02:01.0: seizing device
pciback 0000:03:00.0: seizing device
pciback 0000:03:00.1: seizing device
pciback 0000:04:00.0: seizing device
pciback 0000:04:00.1: seizing device

(I'm trying to export a multiport nic exported to the hvm, the actual
interfaces are 03.00.0/1 and 04:00.0/1, the rest I think are PCI
bridges?  I don't know if I just have to hide the final address or the
whole tree but neither way works at the moment.)

My suspicion is that the BIOS (using the latest F7f release) for the
machine may not be enabling all the virtualisation features of the
system as in xm dmesg (full output below) I get

(XEN) [VT-D]ACPI DMAR:No DMAR devices found

Are there any suggestions for things to try to get this working?  I
thought even if I didn't have VT-d I should still be able to export a
PCI device to a domU?  The other thing that I have noticed is that the
/proc/cpuinfo flags do not list vmx when running under xen but if I boot
a Knoppix livecd then this capability is reported, is that to be


# xm dmesg
 __  __            _____  ____    _
 \ \/ /___ _ __   |___ / |___ \  / |
  \  // _ \ '_ \    |_ \   __) | | |
  /  \  __/ | | |  ___) | / __/ _| |
 /_/\_\___|_| |_| |____(_)_____(_)_|

(XEN) Xen version 3.2.1 (root@xxxxxxxxxxxxxx) (gcc version 4.1.2 (Gentoo
4.1.2 p1.1)) Fri May  9 11:24:51 BST 2008
(XEN) Latest ChangeSet: unavailable
(XEN) Command line: console=vga vtd=1
(XEN) Video information:
(XEN)  VGA is text mode 80x25, font 8x16
(XEN)  VBE/DDC methods: none; EDID transfer time: 0 seconds
(XEN)  EDID info not retrieved because no DDC retrieval method detected
(XEN) Disc information:
(XEN)  Found 2 MBR signatures
(XEN)  Found 2 EDD information structures
(XEN) Xen-e820 RAM map:
(XEN)  0000000000000000 - 000000000009e800 (usable)
(XEN)  000000000009f800 - 00000000000a0000 (reserved)
(XEN)  00000000000f0000 - 0000000000100000 (reserved)
(XEN)  0000000000100000 - 000000007f5e0000 (usable)
(XEN)  000000007f5e0000 - 000000007f5e3000 (ACPI NVS)
(XEN)  000000007f5e3000 - 000000007f5f0000 (ACPI data)
(XEN)  000000007f5f0000 - 000000007f600000 (reserved)
(XEN)  00000000d0000000 - 00000000e0000000 (reserved)
(XEN)  00000000fec00000 - 0000000100000000 (reserved)
(XEN) System RAM: 2037MB (2086392kB)
(XEN) Xen heap: 14MB (15044kB)
(XEN) Domain heap initialised: DMA width 32 bits
(XEN) Processor #0 7:7 APIC version 20
(XEN) Processor #1 7:7 APIC version 20
(XEN) IOAPIC[0]: apic_id 2, version 32, address 0xfec00000, GSI 0-23
(XEN) Enabling APIC mode:  Flat.  Using 1 I/O APICs
(XEN) [VT-D]ACPI DMAR:No DMAR devices found
(XEN) Using scheduler: SMP Credit Scheduler (credit)
(XEN) Detected 2666.802 MHz processor.
(XEN) HVM: VMX enabled
(XEN) CPU0: Intel(R) Core(TM)2 Duo CPU     E8200  @ 2.66GHz stepping 06
(XEN) Booting processor 1/1 eip 8c000
(XEN) CPU1: Intel(R) Core(TM)2 Duo CPU     E8200  @ 2.66GHz stepping 06
(XEN) Total of 2 processors activated.
(XEN)  -> Using new ACK method
(XEN) Platform timer overflows in 14998 jiffies.
(XEN) Platform timer is 14.318MHz HPET
(XEN) Brought up 2 CPUs
(XEN) xenoprof: Initialization failed. Intel processor model 23 for P6
class family is not supported
(XEN) AMD IOMMU: Disabled
(XEN)  Xen  kernel: 64-bit, lsb, compat32
(XEN)  Dom0 kernel: 64-bit, lsb, paddr 0x200000 -> 0x7082c8
(XEN)  Dom0 alloc.:   000000007a000000->000000007b000000 (474683 pages
to be allocated)
(XEN)  Loaded kernel: ffffffff80200000->ffffffff807082c8
(XEN)  Init. ramdisk: ffffffff80709000->ffffffff80bbf200
(XEN)  Phys-Mach map: ffffffff80bc0000->ffffffff80f671d8
(XEN)  Start info:    ffffffff80f68000->ffffffff80f684a4
(XEN)  Page tables:   ffffffff80f69000->ffffffff80f74000
(XEN)  Boot stack:    ffffffff80f74000->ffffffff80f75000
(XEN)  TOTAL:         ffffffff80000000->ffffffff81000000
(XEN)  ENTRY ADDRESS: ffffffff80200000
(XEN) Dom0 has maximum 2 VCPUs
(XEN) Initrd len 0x4b6200, start at 0xffffffff80709000
(XEN) Scrubbing Free RAM: .done.
(XEN) Xen trace buffers: disabled
(XEN) Std. Loglevel: Errors and warnings
(XEN) Guest Loglevel: Nothing (Rate-limited: Errors and warnings)
(XEN) Xen is relinquishing VGA console.
(XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch
input to Xen)
(XEN) Freed 100kB init memory.

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