[Xen-devel] PTE Write access is not set

[Liwei <xieliwei@xxxxxxxxx>]

Hello list,
    Using the 3.1.5 kernel and 4.1.3-rc1-pre xen (Latest ChangeSet:
Tue Dec 06 10:53:12 2011 +0000 23199:d9f8316a8291), these crashes
occur after about a day or so of running a HVM:
=================8<=================
(XEN) realmode.c:115:d9 Failed to emulate insn.
(XEN) realmode.c:165:d9 Real-mode emulation failed @ e40a:00005f6c: d9
33 01 fc 30 34
(XEN) domain_crash called from realmode.c:166
(XEN) Domain 9 (vcpu#0) crashed on cpu#6:
(XEN) ----[ Xen-4.1.3-rc1-pre  x86_64  debug=n  Not tainted ]----
(XEN) CPU:    6
(XEN) RIP:    e40a:[<0000000000005f6c>]
(XEN) RFLAGS: 0000000000010002   CONTEXT: hvm guest
(XEN) rax: 000000000000e7e5   rbx: 0000000000000000   rcx: 00000000000d0000
(XEN) rdx: 00000000000001f7   rsi: 0000000000000000   rdi: 0000000000000dba
(XEN) rbp: 0000000000000182   rsp: 0000000000000db0   r8:  0000000000000000
(XEN) r9:  0000000000000000   r10: 0000000000000000   r11: 0000000000000000
(XEN) r12: 0000000000000000   r13: 0000000000000000   r14: 0000000000000000
(XEN) r15: 0000000000000000   cr0: 0000000000000010   cr4: 0000000000000000
(XEN) cr3: 0000000000000000   cr2: 0000000000000000
(XEN) ds: 9fc0   es: 9e00   fs: 0000   gs: 0000   ss: 9e00   cs: e40a
=================8<=================
(XEN) realmode.c:115:d5 Failed to emulate insn.
(XEN) realmode.c:165:d5 Real-mode emulation failed @ c5d5:000242bc: d9
33 01 fc 30 34
(XEN) domain_crash called from realmode.c:166
(XEN) Domain 5 (vcpu#0) crashed on cpu#0:
(XEN) ----[ Xen-4.1.3-rc1-pre  x86_64  debug=n  Not tainted ]----
(XEN) CPU:    0
(XEN) RIP:    c5d5:[<00000000000242bc>]
(XEN) RFLAGS: 0000000000010013   CONTEXT: hvm guest
(XEN) rax: 000000000000001b   rbx: 0000000000000702   rcx: 0000000000010ba7
(XEN) rdx: 0000000000008fd5   rsi: 0000000000001333   rdi: 000000000000900e
(XEN) rbp: 000000000000703e   rsp: 000000000000c5cf   r8:  0000000000000000
(XEN) r9:  0000000000000000   r10: 0000000000000000   r11: 0000000000000000
(XEN) r12: 0000000000000000   r13: 0000000000000000   r14: 0000000000000000
(XEN) r15: 0000000000000000   cr0: 0000000000000010   cr4: 0000000000000000
(XEN) cr3: 0000000000000000   cr2: 0000000000000000
(XEN) ds: 0000   es: 0000   fs: 0000   gs: 0000   ss: 0000   cs: c5d5
(XEN) [VT-D]iommu.c:856: iommu_fault_status: Primary Pending Fault
(XEN) [VT-D]iommu.c:831: DMAR:[DMA Write] Request device [0d:00.1]
fault addr d8964f44000, iommu reg = ffff82c3fff57000
(XEN) DMAR:[fault reason 05h] PTE Write access is not set
(XEN) print_vtd_entries: iommu = ffff83045ce565c0 bdf = d:0.1 gmfn = d8964f44
(XEN)     root_entry = ffff8304519d1000
(XEN)     root_entry[d] = 4127af001
(XEN)     context = ffff8304127af000
(XEN)     context[1] = 2_414aca001
(XEN)     l4 = ffff830414aca000
(XEN)     l4_index = 1b
(XEN)     l4[1b] = 0
(XEN)     l4[1b] not present
=================8<=================

    If I try to restart the crashed VM, the same crash always occurs
again during POST (the last thing I see on the VNC console is the BIOS
boot, before the connection terminates). A dom0 reboot is necessary to
get things to work again.
    0d:00.1 is part of an Intel 82575GB quad port network adapter. The
adapter contains three ports, 0d:00.0, 0d:00.1, 0e:00.0, 0e:00.1. Each
of them is assigned to a VM. So far the crashes have occurred to VMs
using 0d:00.1, 0e:00.0 and 0e:00.1. (Pretty sure a crash involving
0d:00.0 will come soon).
    Is this a potential bug, or (more likely?) problematic hardware?

The relevant PCI subtree looks like this:
=================8<=================
 \-[0000:00]-+-00.0
             +-03.0-[01]--+-00.0
             |            \-00.1
             +-05.0-[02-0e]----00.0-[03-0e]--+-00.0-[04]----00.0

+-02.0-[05-0a]----00.0-[06-0a]--+-02.0-[07]----00.0
                                             |
      +-03.0-[08]----00.0
                                             |
      +-04.0-[09]----00.0
                                             |
      \-05.0-[0a]----00.0

\-03.0-[0b-0e]----00.0-[0c-0e]--+-02.0-[0d]--+-00.0

      |            \-00.1

      \-04.0-[0e]--+-00.0

                   \-00.1
=================8<=================

Thanks!

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