[Xen-users] VT-D RMRR is incorrect

[Yoshiharu Mori <ymori4480@xxxxxxxxx>]

I try pci pci passthrough with xen 3.3.1 and CentOS 5.2(64bit)
on a SUPERMICRO C7X58 board

I see the following the error in my boot log.

(XEN) [VT-D]dmar.c:372: RMRR is incorrect.

This problem is caused by this condition in dmr.c:372.

 if ( rmrr->base_address >= rmrr->end_address )
 {
   dprintk(XENLOG_ERR VTDPREFIX, "RMRR is incorrect.\n");
   return -EFAULT;
 }

As an experiment, I delete the "return -EFAULT" and re-compiling Xen,
I can pass a PCI device through to Gest-OS(Windows XP) and have no problem
with using the devices on Gest-OS.

Is the above condition really correct and important ?

xm dmesg results with deleting "return -EFAULT" are following.

[root@localhost ~]# xm dmesg
 __  __            _____  _____  _
 \ \/ /___ _ __   |___ / |___ / / |
  \  // _ \ '_ \    |_ \   |_ \ | |
  /  \  __/ | | |  ___) | ___) || |
 /_/\_\___|_| |_| |____(_)____(_)_|

(XEN) Xen version 3.3.1 (root@(none)) (gcc version 4.1.2 20071124 (Red Hat 4.1.2-42)) Sat Feb 14 05:21:09 JST 2009
(XEN) Latest ChangeSet: unavailable
(XEN) Command line: iommu msi=1
(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 0 MBR signatures
(XEN)  Found 2 EDD information structures
(XEN) Xen-e820 RAM map:
(XEN)  0000000000000000 - 0000000000099400 (usable)
(XEN)  0000000000099400 - 00000000000a0000 (reserved)
(XEN)  00000000000e0000 - 0000000000100000 (reserved)
(XEN)  0000000000100000 - 00000000bf790000 (usable)
(XEN)  00000000bf790000 - 00000000bf79e000 (ACPI data)
(XEN)  00000000bf79e000 - 00000000bf7d0000 (ACPI NVS)
(XEN)  00000000bf7d0000 - 00000000bf7e0000 (reserved)
(XEN)  00000000bf7ec000 - 00000000c0000000 (reserved)
(XEN)  00000000fee00000 - 00000000fee01000 (reserved)
(XEN)  00000000ffc00000 - 0000000100000000 (reserved)
(XEN)  0000000100000000 - 00000001c0000000 (usable)
(XEN) System RAM: 6135MB (6282404kB)
(XEN) ACPI: RSDP 000F9C50, 0024 (r2 ACPIAM)
(XEN) ACPI: XSDT BF790100, 0054 (r1 112608 XSDT1738 20081126 MSFT       97)
(XEN) ACPI: FACP BF790290, 00F4 (r4 112608 FACP1738 20081126 MSFT       97)
(XEN) ACPI: DSDT BF790470, 5AA5 (r2  1F380 1F380000        0 INTL 20051117)
(XEN) ACPI: FACS BF79E000, 0040
(XEN) ACPI: APIC BF790390, 0092 (r2 112608 APIC1738 20081126 MSFT       97)
(XEN) ACPI: MCFG BF790430, 003C (r1 112608 OEMMCFG  20081126 MSFT       97)
(XEN) ACPI: OEMB BF79E040, 0072 (r1 112608 OEMB1738 20081126 MSFT       97)
(XEN) ACPI: DMAR BF79E0C0, 0118 (r1    AMI  OEMDMAR        1 MSFT       97)
(XEN) ACPI: SSDT BF7A0260, 1298 (r1 DpgPmm    CpuPm       12 INTL 20051117)
(XEN) Xen heap: 14MB (14536kB)
(XEN) Domain heap initialised
(XEN) Processor #0 7:10 APIC version 21
(XEN) Processor #2 7:10 APIC version 21
(XEN) Processor #4 7:10 APIC version 21
(XEN) Processor #6 7:10 APIC version 21
(XEN) Processor #1 7:10 APIC version 21
(XEN) Processor #3 7:10 APIC version 21
(XEN) Processor #5 7:10 APIC version 21
(XEN) Processor #7 7:10 APIC version 21
(XEN) IOAPIC[0]: apic_id 8, version 32, address 0xfec00000, GSI 0-23
(XEN) Enabling APIC mode:  Flat.  Using 1 I/O APICs
(XEN) [VT-D]dmar.c:372: RMRR is incorrect.
(XEN) Intel VT-d has been enabled
(XEN) Using scheduler: SMP Credit Scheduler (credit)
(XEN) Detected 2660.058 MHz processor.
(XEN) VMX: EPT is available.
(XEN) VMX: VPID is available.
(XEN) HVM: VMX enabled
(XEN) HVM: Hardware Assisted Paging detected.
(XEN) CPU0: Intel(R) Core(TM) i7 CPU         920  @ 2.67GHz stepping 04
(XEN) Booting processor 1/2 eip 8c000
(XEN) CPU1: Intel(R) Core(TM) i7 CPU         920  @ 2.67GHz stepping 04
(XEN) Booting processor 2/4 eip 8c000
(XEN) CPU2: Intel(R) Core(TM) i7 CPU         920  @ 2.67GHz stepping 04
(XEN) Booting processor 3/6 eip 8c000
(XEN) CPU3: Intel(R) Core(TM) i7 CPU         920  @ 2.67GHz stepping 04
(XEN) Booting processor 4/1 eip 8c000
(XEN) CPU4: Intel(R) Core(TM) i7 CPU         920  @ 2.67GHz stepping 04
(XEN) Booting processor 5/3 eip 8c000
(XEN) CPU5: Intel(R) Core(TM) i7 CPU         920  @ 2.67GHz stepping 04
(XEN) Booting processor 6/5 eip 8c000
(XEN) CPU6: Intel(R) Core(TM) i7 CPU         920  @ 2.67GHz stepping 04
(XEN) Booting processor 7/7 eip 8c000
(XEN) CPU7: Intel(R) Core(TM) i7 CPU         920  @ 2.67GHz stepping 04
(XEN) Total of 8 processors activated.
(XEN) ENABLING IO-APIC IRQs
(XEN)  -> Using new ACK method
(XEN) checking TSC synchronization across 8 CPUs: passed.
(XEN) Platform timer is 3.579MHz ACPI PM Timer
(XEN) Brought up 8 CPUs
(XEN) I/O virtualisation enabled
(XEN) I/O virtualisation for PV guests disabled
(XEN) [VT-D]iommu.c:1269:d32767 domain_context_mapping:invalid
(XEN) [VT-D]iommu.c:1269:d32767 domain_context_mapping:invalid
(XEN) [VT-D]iommu.c:1269:d32767 domain_context_mapping:invalid
(XEN) [VT-D]iommu.c:1269:d32767 domain_context_mapping:invalid
(XEN) [VT-D]iommu.c:1269:d32767 domain_context_mapping:invalid
(XEN) [VT-D]iommu.c:1269:d32767 domain_context_mapping:invalid
(XEN) [VT-D]iommu.c:1269:d32767 domain_context_mapping:invalid
(XEN) [VT-D]iommu.c:1269:d32767 domain_context_mapping:invalid
(XEN) [VT-D]iommu.c:1269:d32767 domain_context_mapping:invalid
(XEN) [VT-D]iommu.c:1269:d32767 domain_context_mapping:invalid
(XEN) *** LOADING DOMAIN 0 ***
(XEN)  Xen  kernel: 64-bit, lsb, compat32
(XEN)  Dom0 kernel: 64-bit, lsb, paddr 0xffffffff80200000 -> 0xffffffff805c190c
(XEN) PHYSICAL MEMORY ARRANGEMENT:
(XEN)  Dom0 alloc.:   00000001b6000000->00000001b8000000 (1498227 pages to be allocated)
(XEN) VIRTUAL MEMORY ARRANGEMENT:
(XEN)  Loaded kernel: ffffffff80200000->ffffffff805c190c
(XEN)  Init. ramdisk: ffffffff805c2000->ffffffff80b88200
(XEN)  Phys-Mach map: ffffffff80b89000->ffffffff81707398
(XEN)  Start info:    ffffffff81708000->ffffffff817084a4
(XEN)  Page tables:   ffffffff81709000->ffffffff81718000
(XEN)  Boot stack:    ffffffff81718000->ffffffff81719000
(XEN)  TOTAL:         ffffffff80000000->ffffffff81800000
(XEN)  ENTRY ADDRESS: ffffffff80200000
(XEN) Dom0 has maximum 8 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 104kB init memory.

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