I think the BIOS is broken with respect to VT-d. Please try to update to the latest BIOS.

Thanks,
-- Dexuan

-----Original Message-----
From: xen-devel-bounces@lists.xensource.com [mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Mark Hurenkamp
Sent: 2010Äê3ÔÂ31ÈÕ 4:58
To: xen-devel@lists.xensource.com
Subject: [Xen-devel] VT-d on Asus P7P55D-Evo: IOMMU not supported

Hi,

Having updated my Xen to 4.0-rc9-pre recently, i decided to try  
booting without the iommu=0 flag.
The system doesn't crash now (which is an improvement), but gracefully  
disables VT-d due to an
unsupported IOMMU.

I've attached the output of xm dmesg, hope it is of use to someone.
Do let me know if there's something more i can do to help in getting  
VT-d working on this board.

Regards,
Mark.

  __  __            _  _    ___   ___               ___
  \ \/ /___ _ __   | || |  / _ \ / _ \    _ __ ___ / _ \    _ __  _ __  
___
   \  // _ \ '_ \  | || |_| | | | | | |__| '__/ __| (_) |__| '_ \|  
'__/ _ \
   /  \  __/ | | | |__   _| |_| | |_| |__| | | (__ \__, |__| |_) | |  
|  __/
  /_/\_\___|_| |_|    |_|(_)___(_)___/   |_|  \___|  /_/   | .__/|_|   
\___|
                                                           |_|
(XEN) Xen version 4.0.0-rc9-pre (root@karpeer.net) (gcc version 4.4.1  
(Ubuntu 4.4.1-4ubuntu9) ) Mon Mar 29 23:07:18 CEST 2010
(XEN) Latest ChangeSet: Sat Mar 27 16:01:35 2010 +0000  
21078:f3db0ae08304
(XEN) Command line:
(XEN) Video information:
(XEN)  VGA is text mode 80x25, font 8x16
(XEN)  VBE/DDC methods: V2; EDID transfer time: 1 seconds
(XEN) Disc information:
(XEN)  Found 2 MBR signatures
(XEN)  Found 2 EDD information structures
(XEN) Xen-e820 RAM map:
(XEN)  0000000000000000 - 000000000009fc00 (usable)
(XEN)  000000000009fc00 - 00000000000a0000 (reserved)
(XEN)  00000000000e4000 - 0000000000100000 (reserved)
(XEN)  0000000000100000 - 000000007f670000 (usable)
(XEN)  000000007f670000 - 000000007f688000 (ACPI data)
(XEN)  000000007f688000 - 000000007f6dc000 (ACPI NVS)
(XEN)  000000007f6dc000 - 000000007f700000 (reserved)
(XEN)  000000007f800000 - 0000000080000000 (reserved)
(XEN)  00000000fee00000 - 00000000fee01000 (reserved)
(XEN)  00000000ffe00000 - 0000000100000000 (reserved)
(XEN)  0000000100000000 - 0000000180000000 (usable)
(XEN) ACPI: RSDP 000FB470, 0024 (r2 ACPIAM)
(XEN) ACPI: XSDT 7F670100, 0064 (r1 022210 XSDT2250 20100222  
MSFT       97)
(XEN) ACPI: FACP 7F670290, 00F4 (r3 022210 FACP2250 20100222  
MSFT       97)
(XEN) ACPI: DSDT 7F6704A0, EF5B (r1  A1290 A1290001        1 INTL  
20060113)
(XEN) ACPI: FACS 7F688000, 0040
(XEN) ACPI: APIC 7F670390, 00CC (r1 022210 APIC2250 20100222  
MSFT       97)
(XEN) ACPI: MCFG 7F670460, 003C (r1 022210 OEMMCFG  20100222  
MSFT       97)
(XEN) ACPI: OEMB 7F688040, 0072 (r1 022210 OEMB2250 20100222  
MSFT       97)
(XEN) ACPI: HPET 7F67F7A0, 0038 (r1 022210 OEMHPET  20100222  
MSFT       97)
(XEN) ACPI: DMAR 7F6880C0, 0090 (r1    AMI  OEMDMAR        1  
MSFT       97)
(XEN) ACPI: ASPT 7F67FA40, 0034 (r6 022210 PerfTune 20100222  
MSFT       97)
(XEN) ACPI: OSFR 7F67FA80, 00B0 (r1 022210 OEMOSFR  20100222  
MSFT       97)
(XEN) System RAM: 3880MB (3973552kB)
(XEN) Domain heap initialised
(XEN) Processor #0 7:14 APIC version 21
(XEN) Processor #2 7:14 APIC version 21
(XEN) Processor #4 7:14 APIC version 21
(XEN) Processor #6 7:14 APIC version 21
(XEN) IOAPIC[0]: apic_id 7, version 32, address 0xfec00000, GSI 0-23
(XEN) Enabling APIC mode:  Flat.  Using 1 I/O APICs
(XEN) Using scheduler: SMP Credit Scheduler (credit)
(XEN) Detected 3715.495 MHz processor.
(XEN) Initing memory sharing.
(XEN) VMX: Supported advanced features:
(XEN)  - APIC MMIO access virtualisation
(XEN)  - APIC TPR shadow
(XEN)  - Extended Page Tables (EPT)
(XEN)  - Virtual-Processor Identifiers (VPID)
(XEN)  - Virtual NMI
(XEN)  - MSR direct-access bitmap
(XEN) HVM: ASIDs enabled.
(XEN) HVM: VMX enabled
(XEN) HVM: Hardware Assisted Paging detected.
(XEN) [VT-D]iommu.c:1086: IOMMU: unsupported
(XEN) ---- print_iommu_regs ----
(XEN)  drhd->address = fed90000
(XEN)  VER = ffffffff
(XEN)  CAP = ffffffffffffffff
(XEN)  n_fault_reg = 100
(XEN)  fault_recording_offset = 3ff0
(XEN)  ECAP = ffffffffffffffff
(XEN)  GCMD = ffffffff
(XEN)  GSTS = ffffffff
(XEN)  RTADDR = ffffffffffffffff
(XEN)  CCMD = ffffffffffffffff
(XEN)  FSTS = ffffffff
(XEN)  FECTL = ffffffff
(XEN)  FEDATA = ffffffff
(XEN)  FEADDR = ffffffff
(XEN)  FEUADDR = ffffffff
(XEN) I/O virtualisation disabled
(XEN) Total of 4 processors activated.
(XEN) ENABLING IO-APIC IRQs
(XEN)  -> Using new ACK method
(XEN) TSC is reliable, synchronization unnecessary
(XEN) Platform timer is 14.318MHz HPET
(XEN) Brought up 4 CPUs
(XEN) *** LOADING DOMAIN 0 ***
(XEN)  Xen  kernel: 64-bit, lsb, compat32
(XEN)  Dom0 kernel: 64-bit, PAE, lsb, paddr 0x1000000 -> 0x25e7000
(XEN) PHYSICAL MEMORY ARRANGEMENT:
(XEN)  Dom0 alloc.:   0000000160000000->0000000170000000 (935455 pages  
to be allocated)
(XEN) VIRTUAL MEMORY ARRANGEMENT:
(XEN)  Loaded kernel: ffffffff81000000->ffffffff825e7000
(XEN)  Init. ramdisk: ffffffff825e7000->ffffffff8dbd4000
(XEN)  Phys-Mach map: ffffffff8dbd4000->ffffffff8e3770f8
(XEN)  Start info:    ffffffff8e378000->ffffffff8e3784b4
(XEN)  Page tables:   ffffffff8e379000->ffffffff8e3f0000
(XEN)  Boot stack:    ffffffff8e3f0000->ffffffff8e3f1000
(XEN)  TOTAL:         ffffffff80000000->ffffffff8e800000
(XEN)  ENTRY ADDRESS: ffffffff81986200
(XEN) Dom0 has maximum 4 VCPUs
(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 160kB init memory.




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