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Re: [GIT PULL] x86/mm changes for v3.9-rc1

To: "H. Peter Anvin" <hpa@linux.intel.com>, yinghai@kernel.org
Subject: Re: [GIT PULL] x86/mm changes for v3.9-rc1
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Date: Fri, 22 Feb 2013 12:24:03 -0500
Cc: Linus Torvalds <torvalds@linux-foundation.org>, "David S. Miller" <davem@davemloft.net>, "H. Peter Anvin" <hpa@zytor.com>, "Rafael J. Wysocki" <rjw@sisk.pl>, stable@vger.kernel.org, Alexander Duyck <alexander.h.duyck@intel.com>, Andrea Arcangeli <aarcange@redhat.com>, Andrew Morton <akpm@linux-foundation.org>, Andrzej Pietrasiewicz <andrzej.p@samsung.com>, Arnd Bergmann <arnd@arndb.de>, Borislav Petkov <bp@alien8.de>, Borislav Petkov <bp@suse.de>, Christoph Lameter <cl@linux.com>, Daniel J Blueman <daniel@numascale-asia.com>, Dave Hansen <dave@linux.vnet.ibm.com>, Eric Biederman <ebiederm@xmission.com>, Fenghua Yu <fenghua.yu@intel.com>, Frederic Weisbecker <fweisbec@gmail.com>, Gleb Natapov <gleb@redhat.com>, Gokul Caushik <caushik1@gmail.com>, "H. J. Lu" <hjl.tools@gmail.com>, Hugh Dickins <hughd@google.com>, Ingo Molnar <mingo@elte.hu>, Ingo Molnar <mingo@kernel.org>, Jacob Shin <jacob.shin@amd.com>, Jamie Lokier <jamie@shareable.org>, Jarkko Sakkinen <jarkko.sakkinen@intel.com>, Jeremy Fitzhardinge <jeremy@goop.org>, Joe Millenbach <jmillenbach@gmail.com>, Joerg Roedel <joro@8bytes.org>, Johannes Weiner <hannes@cmpxchg.org>, Josh Triplett <josh@joshtriplett.org>, Kyungmin Park <kyungmin.park@samsung.com>, Lee Schermerhorn <Lee.Schermerhorn@hp.com>, Len Brown <len.brown@intel.com>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Marcelo Tosatti <mtosatti@redhat.com>, Marek Szyprowski <m.szyprowski@samsung.com>, Matt Fleming <matt.fleming@intel.com>, Mel Gorman <mgorman@suse.de>, Paul Turner <pjt@google.com>, Pavel Machek <pavel@ucw.cz>, Pekka Enberg <penberg@kernel.org>, Peter Zijlstra <a.p.zijlstra@chello.nl>, Ralf Baechle <ralf@linux-mips.org>, Rik van Riel <riel@redhat.com>, Rob Landley <rob@landley.net>, Russell King <linux@arm.linux.org.uk>, Rusty Russell <rusty@rustcorp.com.au>, Shuah Khan <shuah.khan@hp.com>, Shuah Khan <shuahkhan@gmail.com>, Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Steven Rostedt <rostedt@goodmis.org>, Thomas Gleixner <tglx@linutronix.de>, Ville Syrjälä <ville.syrjala@linux.intel.com>, Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>, Yinghai Lu <yinghai@kernel.org>, Zachary Amsden <zamsden@gmail.com>, avi@redhat.com, linux-mips@linux-mips.org, linux-pm@vger.kernel.org, mst@redhat.com, sparclinux@vger.kernel.org, virtualization@lists.linux-foundation.org, xen-devel@lists.xensource.com
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On Fri, Feb 22, 2013 at 11:55:31AM -0500, Konrad Rzeszutek Wilk wrote:
> On Thu, Feb 21, 2013 at 04:34:06PM -0800, H. Peter Anvin wrote:
> > Hi Linus,
> > 
> > This is a huge set of several partly interrelated (and concurrently
> > developed) changes, which is why the branch history is messier than
> > one would like.
> > 
> > The *really* big items are two humonguous patchsets mostly developed
> > by Yinghai Lu at my request, which completely revamps the way we
> > create initial page tables.  In particular, rather than estimating how
> > much memory we will need for page tables and then build them into that
> > memory -- a calculation that has shown to be incredibly fragile -- we
> > now build them (on 64 bits) with the aid of a "pseudo-linear mode" --
> > a #PF handler which creates temporary page tables on demand.
> > 
> > This has several advantages:
> > 
> > 1. It makes it much easier to support things that need access to
> >    data very early (a followon patchset uses this to load microcode
> >    way early in the kernel startup).
> > 
> > 2. It allows the kernel and all the kernel data objects to be invoked
> >    from above the 4 GB limit.  This allows kdump to work on very large
> >    systems.
> > 
> > 3. It greatly reduces the difference between Xen and native (Xen's
> >    equivalent of the #PF handler are the temporary page tables created
> >    by the domain builder), eliminating a bunch of fragile hooks.
> > 
> > The patch series also gets us a bit closer to W^X.
> > 
> > Additional work in this pull is the 64-bit get_user() work which you
> > were also involved with, and a bunch of cleanups/speedups to
> > __phys_addr()/__pa().
> 
> Looking at figuring out which of the patches in the branch did this, but
> with this merge I am getting a crash with a very simple PV guest (booted with
> one 1G):
> 
> Call Trace:
>   [<ffffffff8103feba>] xen_get_user_pgd+0x5a  <--
>   [<ffffffff8103feba>] xen_get_user_pgd+0x5a 
>   [<ffffffff81042d27>] xen_write_cr3+0x77 
>   [<ffffffff81ad2d21>] init_mem_mapping+0x1f9 
>   [<ffffffff81ac293f>] setup_arch+0x742 
>   [<ffffffff81666d71>] printk+0x48 
>   [<ffffffff81abcd62>] start_kernel+0x90 
>   [<ffffffff8109416b>] __add_preferred_console.clone.1+0x9b 
>   [<ffffffff81abc5f7>] x86_64_start_reservations+0x2a 
>   [<ffffffff81abf0c7>] xen_start_kernel+0x564 
> 
> And the hypervisor says:
> (XEN) d7:v0: unhandled page fault (ec=0000)
> (XEN) Pagetable walk from ffffea000005b2d0:
> (XEN)  L4[0x1d4] = 0000000000000000 ffffffffffffffff
> (XEN) domain_crash_sync called from entry.S
> (XEN) Domain 7 (vcpu#0) crashed on cpu#3:
> (XEN) ----[ Xen-4.2.0  x86_64  debug=n  Not tainted ]----
> (XEN) CPU:    3
> (XEN) RIP:    e033:[<ffffffff8103feba>]
> (XEN) RFLAGS: 0000000000000206   EM: 1   CONTEXT: pv guest
> (XEN) rax: ffffea0000000000   rbx: 0000000001a0c000   rcx: 0000000080000000
> (XEN) rdx: 000000000005b2a0   rsi: 0000000001a0c000   rdi: 0000000000000000
> (XEN) rbp: ffffffff81a01dd8   rsp: ffffffff81a01d90   r8:  0000000000000000
> (XEN) r9:  0000000010000001   r10: 0000000000000000   r11: 0000000000000000
> (XEN) r12: 0000000000000000   r13: 0000001000000000   r14: 0000000000000000
> (XEN) r15: 0000000000100000   cr0: 000000008005003b   cr4: 00000000000406f0
> (XEN) cr3: 0000000411165000   cr2: ffffea000005b2d0
> (XEN) ds: 0000   es: 0000   fs: 0000   gs: 0000   ss: e02b   cs: e033
> (XEN) Guest stack trace from rsp=ffffffff81a01d90:
> (XEN)    0000000080000000 0000000000000000 0000000000000000 ffffffff8103feba
> (XEN)    000000010000e030 0000000000010006 ffffffff81a01dd8 000000000000e02b

Here is a better serial log of the crash (just booting a normal Xen 4.1 + 
initial
kernel with 8GB):

PXELINUX 3.82 2009-06-09  Copyright (C) 1994-2009 H. Peter Anvin et al
boot: 
Loading xen.gz... ok
Loading vmlinuz... ok
Loading initramfs.cpio.gz... ok
 __  __            _  _    _   ____                    
 \ \/ /___ _ __   | || |  / | | ___|    _ __  _ __ ___ 
  \  // _ \ '_(_)_(_)____/   | .__/|_|  \___|
                                       |_|             
(XEN) Xen version 4.1.5-pre (konrad@dumpdata.com) (gcc version 4.4.4 20100503 
(Red Hat 4.4.4-2) (GCC) ) Fri Feb 22 11:37:00 EST 2013
(XEN) Latest ChangeSet: Fri Feb 15 15:31:55 2013 +0100 23459:9f12bdd6b7f0
(XEN) Console output is synchronous.
(XEN) Bootloader: unknown
(XEN) Command line: cpuinfo conring_size=1048576 sync_console cpufreq=verbose 
com1=115200,8n1 console=com1,vga loglvl=all guest_loglvl=all
(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 1 MBR signatures
(XEN)  Found 1 EDD information structures
(XEN) Xen-e820 RAM map:
(XEN)  0000000000000000 - 000000000009ec00 (usable)
(XEN)  000000000009ec00 - 00000000000a0000 (reserved)
(XEN)  00000000000e0000 - 0000000000100000 (reserved)
(XEN)  0000000000100000 - 0000000020000000 (usable)
(XEN)  0000000020000000 - 0000000020200000 (reserved)
(XEN)  0000000020200000 - 0000000040000000 (usable)
(XEN)  0000000040000000 - 0000000040200000 (reserved)
(XEN)  0000000040200000 - 00000000bad80000 (usable)
(XEN)  00000000bad80000 - 00000000badc9000 (ACPI NVS)
(XEN)  00000000badc9000 - 00000000badd1000 (ACPI data)
(XEN)  00000000badd1000 - 00000000badf4000 (reserved)
(XEN)  00000000badf4000 - 00000000badf6000 (usable)
(XEN)  00000000badf6000 - 00000000bae06000 (reserved)
(XEN)  00000000bae06000 - 00000000bae14000 (ACPI NVS)
(XEN)  00000000bae14000 - 00000000bae3c000 (reserved)
(XEN)  00000000bae3c000 - 00000000bae7f000 (ACPI NVS)
(XEN)  00000000bae7f000 - 00000000bb000000 (usable)
(XEN)  00000000bb800000 - 00000000bfa00000 (reserved)
(XEN)  00000000fed1c000 - 00000000fed40000 (reserved)
(XEN)  00000000ff000000 - 0000000100000000 (reserved)
(XEN)  0000000100000000 - 000000023fe00000 (usable)
(XEN) ACPI: RSDP 000F0450, 0024 (r2 ALASKA)
(XEN) ACPI: XSDT BADC9068, 0054 (r1 ALASKA    A M I  1072009 AMI     10013)
(XEN)  PROC        1 MSFT  3000001)
(XEN) ACPI: MCFG BADD0580, 003C (r1 ALASKA    A M I  1072009 MSFT       97)
(XEN) ACPI: HPET BADD05C0, 0038 (r1 ALASKA    A M I  1072009 AMI.        4)
(XEN) ACPI: ASF! BADD05F8, 00A0 (r32 INTEL       HCG        1 TFSM    F4240)
(XEN) System RAM: 8104MB (8299140kB)
(XEN) No NUMA configuration found
(XEN) Faking a node at 0000000000000000-000000023fe00000
(XEN) Domain heap initialised
(XEN) found SMP MP-table at 000fcde0
(XEN) DMI 2.7 present.
(XEN) Using APIC driver default
(XEN) ACPI: PM-Timer IO Port: 0x408
(XEN) ACPI: ACPI SLEEP INFO: pm1x_cnt[404,0], pm1x_evt[400,0]
(XEN) ACPI: 32/64X FACS address mismatch in FADT - bae0bf80/0000000000000000, 
using 32
(XEN) ACPI:                  wakeup_vec[bae0bf8c], vec_size[20]
(XEN) ACPI: Local APIC address 0xfee00000
(XEN) ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled)
(XEN) Processor #0 6:10 APIC version 21
(XEN) ACPI: LAPIC (acpi_id[0x02] lapic_id[0x02] enabled)
(XEN) Processor #2 6:10 APIC version 21
(XEN) ACPI: LAPIC (acpi_id[0x03] lapic_id[0x01] enabled)
(XEN) Processor #1 6:10 APIC version 21
(XEN) ACPI: LAPIC (acpi_id[0x04] lapic_id[0x03] enabled)
(XEN) Processor #3 6:10 APIC version 21
(XEN) ACPI: LAPIC_NMI (acpi_id[0xff] high edge lint[0x1])
(XEN) ACPI: IOAPIC (id[0x00] address[0xfec00000] gsi_base[0])
(XEN) IOAPIC[0]: apic_id 0, version 32, address 0xfec00000, GSI 0-23
(XEN) ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
(XEN) ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
(XEN) ACPI: IRQ0 used by override.
(XEN) ACPI: IRQ2 used by override.
(XEN) ACPI: IRQ9 used by override.
(XEN) Enabling APIC mode:  Flat.  Using 1 I/O APICs
(XEN) ACPI: HPET id: 0x8086a701 base: 0xfed00000
(XEN) PCI: MCFG configuration 0: base e0000000 segment 0 buses 0 - 255
(XEN) PCI: Not using MMCONFIG.
(XEN) Table is not found!
(XEN) Using ACPI (MADT) for SMP configuration information
(XEN) IRQ limits: 24 GSI, 760 MSI/MSI-X
(XEN) Using scheduler: SMP Credit Scheduler (credit)
(XEN) Initializing CPU#0
(XEN) Detected 3093.067 MHz processor.
(XEN) Initing memory sharing.
(XEN) CPU: Physical Processor ID: 0
(XEN) CPU: Processor Core ID: 0
(XEN) CPU: L1 I cache: 32K, L1 D cache: 32K
(XEN) CPU: L2 cache: 256K
(XEN) CPU: L3 cache: 3072K
(XEN) mce_intel.c:1162: MCA Capability: BCAST 1 SER 0 CMCI 1 firstbank 0 
extended MCE MSR 0
(XEN) CPU0: Thermal monitoring enabled (TM1)
(XEN) Intel machine check reporting enabled
(XEN) I/O virtualisation disabled
(XEN) CPU0: Intel(R) Core(TM) i3-2100 CPU @ 3.10GHz stepping 07
(XEN) Enabled directed EOI with ioapic_ack_old on!
(XEN) ENABLING IO-APIC IRQs
(XEN)  -> Using old ACK method
(XEN) ..TIMER: vector=0xF0 apic1=0 pin1=2 apic2=-1 pin2=-1
(XEN) TSC deadline timer enabled
(XEN) Platform timer is 14.318MHz HPET
(XEN) Allocated console ring of 1048576 KiB.
(XEN) VMX: Supported advanced features:
(isation
(XEN)  - APIC TPR shadow
(XEN)  - Extended Page Tables (EPT)
(XEN)  - Virtual-Processor Identifiers (VPID)
(XEN)  - Virtual NMI
(XEN)  - MSR direct-access bitmap
(XEN)  - Unrestricted Guest
(XEN) HVM: ASIDs enabled.
(XEN) HVM: VMX enabled
(XEN) HVM: Hardware Assisted Paging (HAP) detected
(XEN) HVM: HAP page sizes: 4kB, 2MB
(XEN) Booting processor 1/1 eip 7c000
(XEN) Initializing CPU#1
(XEN) CPU: Physical Processor ID: 0
(XEN) CPU: Processor Core ID: 0
(XEN) CPU: L1 I cache: 32K, L1 D
(XEN) Initializing CPU#2
(XEN) CPU: Physical Processor ID: 0
(XEN) CPU: Processor Core ID: 1
(XEN) CPU: L1 I cache: 32K, L1 D cache: 32K
(XEN) CPU: L2 cache: 256K
(XEN) CPU: L3 cache: 3072K
(XEN) CPU2: Thermal monitoring enabled (TM1)
(XEN) CPU2: Intel(R) Core(TM) i3-2100 CPU @ 3.10GHz stepping 07
(XEN) Booting processor 3/3 eip 7c000
(XEN) Initializing CPU#3
(XEN) CPU: Physical Processor ID: 0
(XEN) CPU: Processor Core ID: 1
(XEN) CPU: L1 I cache: 32K, L1 D100 CPU @ 3.10GHz stepping 07
(XEN) Brought up 4 CPUs
(XEN) ACPI sleep modes: S3
(XEN) mcheck_poll: Machine check polling timer started.
(XEN) *** LOADING DOMAIN 0 ***
(XEN) elf_parse_binary: phdr: paddr=0x1000000 memsz=0x9e0000
(XEN) elf_parse_binary: phdr: paddr=0x1a00000 memsz=0xa60f0
(XEN): paddr=0x1abc000 memsz=0x61b000
(XEN) elf_parse_binary: memory: 0x1000000 -> 0x20d7000
(XEN) elf_xen_parse_note: GUEST_OS = "linux"
(XEN) elf_xen_parse_note: GUEST_VERSION = "2.6"
(XEN) elf_xen_parse_note: XEN_VERSION = "xen-3.0"
(XEN) elf_xen_parse_note: VIRT_BASE = 0xffffffff80000000
(XEN) elf_xen_parse_note: ENTRY = 0xffffffff81abc1e0
(XEN) elf_xen_parse_note: HYPERCALL_PAGE = 0xffffffff81001000
(XEN) elf_xen_parse_note: FEATURES = "!writable_page_tables|pae_pgdir_above_4gb"
(XEN) elf_xen_parse_note: PAE_MODE = "yes"
(XEN) elf_xen_parse_note: LOADER = "generic"
(XEN) elf_xen_parse_note: unknown xen elf note (0xd)
(XEN) elf_xen_parse_note: SUSPEND_CANCEL = 0x1
(XEN) elf_xen_parse_note: HV_START_LOW = 0xffff800000000000
(XEN) elf_xen_parse_note: PADDR_OFFSET = 0x0
(XEN) elf_xen_addr_calc_check: addresses:
(XEN)     virt_base        = 0xffffffff80000000
(XEN)     elf_paddr_offset = 0x0
(XEN)     virt_offset      = 0xffffffff80000000
(XEN)     virt_kstart      = 0xffffffff81000000
(XEN)     virt_kend        = 0xffffffff820d7000
(XEN)     virt_entry       = 0xffffffff81abc1e0
(XEN)     p2m_base         = 0xffffffffffffffff
(XEN)  Xen  kernel: 64-bit, lsb, compat32
(XEN)  Dom0 kernel: 64-bit, PAE, lsb, paddr 0x1000000 -> 0x20d7000
(XEN) PHYSICAL MEMORY ARRANGEMENT:
(XEN)  Dom0 alloc.:   0000000220000000->0000000224000000 (1661249 pages to be 
allocated)
(XEN)  Init. ramdisk: 000000022cbdc000->000000023fe00000
(XEN) VIRTUAL MEMORY ARRANGEMENT:
(XEN)  Loaded kernel: ffffffff81000000->ffffffff820d7000
(XEN)  Init. ramdisk: ffffffff820d7000->ffffffff952fb000
(XEN)  Phys-Mach map: ffffffff952fb000->ffffffff96060b28
(XEN)  Start info:    ffffffff96061000->ffffffff960614b4
(XEN)  Page tables:   ffffffff96062000->ffffffff96117000
(XEN)  Boot stack:    ffffffff96117000->ffffffff96118000
(XEN)  TOTAL:         ffffffff80000000->ffffffff96400000
(XEN)  ENTRY ADDRESS: ffffffff81abc1e0
(XEN) Dom0 has maximum 4 VCPUs
(XEN) elf_load_binary: phdr 0 at 0xffffffff81000000 -> 0xffffffff819e0000
(XEN) elf_load_binary: phdr 1 at 0xffffffff81a00000 -> 0xffffffff81aa60f0
(XEN) elf_load_binary: phdr 2 at 0xffffffff81aa7000 -> 0xffffffff81abbbc0
(XEN) elf_load_binary: phdr 3 at 0xffffffff81abc000 -> 0xffffffff81baf000
(XEN) Scrubbing Free RAM: .done.
(XEN) Xen trace buffers: disabled
(XEN) Std. Loglevel: All
(XEN) Guest Loglevel: All
(XEN) ***************************intended to aid debugging of Xen by ensuring
(XEN) ******* that all output is synchronously delivered on the serial line.
(XEN) ******* However it can introduce SIGNIFICANT latencies and affect
(XEN) ******* timekeeping. It is NOT recommended for production use!
(XEN) **********************************************
(XEN) 3... 2... 1... 
(XEN) Xen is relinquishing VGA console.
(XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch input to 
Xen)
(XEN) Freed 224kB init memory.
mapping kernel into physical memory
about to get started...
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Linux version 3.8.0upstream-06471-g2ef14f4-dirty 
(konrad@build.dumpdata.com) (gcc version 4.4.4 20100503 (Red Hat 4.4.4-2) (GCC) 
) #1 SMP Fri Feb 22 11:36:48 EST 2013
[    0.000000] Command line: initcall_debug debug console=hvc0 loglevel=10 
xen-pciback.hide=(01:00.0) earlyprintk=xen
[    0.000000] Freeing 9e-100 pfn range: 98 pages freed
[    0.000000] 1-1 mapping on 9e->100
[    0.000000] Freeing 20000-20200 pfn range: 512 pages freed
[    0.000000] 1-1 mapping on 20000->20200
[    0.000000] Freeing 40000-40200 pfn range: 512 pages freed
[    0.000000] 1-1 mapping on 40000->40200
[    0.000000] Freeing bad80-badf4 pfn range: 116 pages freed
[    0.000000] 1-1 mapping on bad80->badf4
[    0.000000] Freeing badf6-bae7f pfn range: 137 pages freed
[    0.000000] 1-1 mapping on badf6->bae7f
[    0.000000] Freeing bb000-100000 pfn range: 282624 pages freed
[    0.000000] 1-1 mapping on bb000->100000
[    0.000000] Released 283999 pages of unused memory
[    0.000000] Set 283999 page(s) to 1-1 mapping
[    0.000000] Populating 1acb65-1f20c4 pfn range: 283999 pages added
[    0.000000] e820: BIOS-provided physical RAM map:
[    0.000000] Xen: [mem 0x0000000000000000-0x000000000009dfff] usable
[    0.000000] Xen: [mem 0x000000000009ec00-0x00000000000fffff] reserved
[    0.000000] Xen: [mem 0x0000000000100000-0x000000001fffffff] usable
[    0.000000] Xen: [mem 0x0000000020000000-0x00000000201fffff] reserved
[    0.000000] Xen: [mem 0x0000000020200000-0x000000003fffffff] usable
[    0.000000] Xen: [mem 0x0000000040000000-0x00000000401fffff] reserved
[    0.000000] Xen: [mem 0x0000000040200000-0x00000000bad7ffff] usable
[    0.000000] Xen: [mem 0x00000000bad80000-0x00000000badc8fff] ACPI NVS
[    0.000000] Xen: [mem 0x00000000badc9000-0x00000000badd0fff] ACPI data
[    0.000000] Xen: [mem 0x00000000badd1000-0x00000000badf3fff] reserved
[    0.000000] Xen: [mem 0x00000000badf4000-0x00000000badf5fff] usable
[    0.000000] Xen: [mem 0x00000000badf6000-0x00000000bae05fff] reserved
[    0.000000] Xen: [mem 0x00000000bae06000-0x00000000bae13fff] ACPI NVS
[    0.000000] Xen: [mem 0x00000000bae14000-0x00000000bae3bfff] reserved
[    0.000000] Xen: [mem 0x00000000bae3c000-0x00000000bae7efff] ACPI NVS
[    0.000000] Xen: [mem 0x00000000bae7f000-0x00000000baffffff] usable
[    0.000000] Xen: [mem 0x00000000bb800000-0x00000000bf9fffff] reserved
[    0.000000] Xen: [mem 0x00000000fec00000-0x00000000fec00fff] reserved
[    0.000000] Xen: [mem 0x00000000fed1c000-0x00000000fed3ffff] reserved
[    0.000000] Xen: [mem 0x00000000fee00000-0x00000000fee00fff] reserved
[    0.000000] Xen: [mem 0x00000000ff000000-0x00000000ffffffff] reserved
[    0.000000] Xen: [mem 0x0000000100000000-0x000000023fdfffff] usable
[    0.000000] bootconsole [xenboot0] enabled
[    0.000000] NX (Execute Disable) protection: active
[    0.000000] SMBIOS 2.7 present.
[    0.000000] DMI: MSI MS-7680/H61M-P23 (MS-7680), BIOS V17.0 03/14/2011
[    0.000000] e820: update [mem 0x00000000-0x00000fff] usable ==> reserved
[    0.000000] e820: remove [mem 0x000a0000-0x000fffff] usable
[    0.000000] No AGP bridge found
[    0.000000] e820: last_pfn = 0x23fe00 max_arch_pfn = 0x400000000
[    0.000000] e820: lacanning 1 areas for low memory corruption
[    0.000000] Base memory trampoline at [ffff880000098000] 98000 size 24576
[    0.000000] reserving inaccessible SNB gfx pages
[    0.000000] init_memory_mapping: [mem 0x00000000-0x000fffff]
[    0.000000]  [mem 0x00000000-0x000fffff] page 4k
[    0.000000] init_memory_mapping: [mem 0x1f2000000-0x1f20c3fff]
[    0.000000]  [mem 0x1f2000000-0x1f20c3fff] page 4k
[    0.000000] BRK [0x01cd2000, 0x01cd2fff] PGTABLE
[    0.000000] BRK [0x01cd3000, 0x01cd3fff] PGTABLE
[    0.000000] init_memory_mapping: [mem 0x1f0000000-0x1f1ffffff]
[    0.000000]  [mem 0x1f0000000-0x1f1ffffff] page 4k
[    0.000000] BRK [0x01cd4000, 0x01cd4fff] PGTABLE
[    0.000000] BRK [0x01cd5000, 0x01cd5fff] PGTABLE
[    0.000000] BRK [0x01cd6000, 0x01cd6fff] PGTABLE
[    0.000000] init_memory_mapping: [mem 0x180000000-0x1efffffff]
[    0.000000]  [mem 0x180000000-0x1efffffff] page 4k
[    0.000000] init_memory_mapping: [mem 0x00100000-0x1fffffff]
[    0.000000]  [mem 0x00100000-0x1fffffff] page 4k
[    0.000000] init_memory_mapping: [mem 0x20200000-0x3fffffff]
[    0.000000]  [mem 0x20200000-0x3fffffff] page 4k
[    0.000000] init_memory_mapping: [mem 0x40200000-0xbad7ffff]
[    0.000000]  [mem 0x40200000-0xbad7ffff] page 4k
[    0.000000] init_memory_mapping: [mem 0xbadf4000-0xbadf5fff]
[    0.000000]  [mem 0xbadf4000-0xbadf5fff] page 4k
[    0.000000] init_memory_mapping: [mem 0xbae7f000-0xbaffffff]
[    0.000000]  [mem 0xbae7f000-0xbaffffff] page 4k
[    0.000000] init_memory_mapping: [mem 0x100000000-0x17fffffff]
[    0.000000]  [mem 0x100000000-0x17fffffff] page 4k
[    0.000000] init_memory_mapping: [mem 0x1f20c4000-0x23fdfffff]
[    0.000000]  [mem 0x1f20c4000-0x23fdfffff] page 4k
(XEN) d0:v0: unhandled page fault (ec=0000)
(XEN) Pagetable walk from ffffea000005b2d0:
(XEN)  L4[0x1d4] = 0000000000000000 ffffffffffffffff
(XEN) domain_crash_sync called from entry.S
(XEN) Domain 0 (vcpu#0) crashed on cpu#0:
(XEN) ----[ Xen-4.1.5-pre  x86_64  debug=y  Tainted:    C ]----
(XEN) CPU:    0
(XEN) RIP:    e033:[<ffffffff8103feba>]
(XEN) RFLAGS: 0000000000000206   EM: 1   CONTEXT: pv guest
(XEN) rax: ffffea0000000000   rbx: 0000000001a0c000   rcx: 0000000080000000
(XEN) rdx: 000000000005b2a0   rsi: 0000000001a0c000   rdi: 0000000000000000
(XEN) rbp: ffffffff81a01dd8   rsp: ffffffff81a01d90   r8:  0000000000000000
(XEN) r9:  0000000010000001   r10: 0000000000000005   r11: 0000000000100000
(XEN) r12: 0000000000000000   r13: 0000020000000000   r14: 0000000000000000
(XEN) r15: 0000000000100000   cr0: 000000008005003b   cr4: 00000000000026f0
(XEN) cr3: 0000000221a0c000   cr2: ffffea000005b2d0
(XEN) ds: 0000   es: 0000   fs: 0000   gs: 0000   ss: e02b   cs: e033
(XEN) Guest stack trace from rsp=ffffffff81a01d90:
(XEN)    0000000080000000 0000000000100000 0000000000000000 ffffffff8103feba
(XEN)    000000010000e030 0000000000010006 ffffffff81a01dd8 000000000000e02b
(XEN)    0000000000000000 ffffffff81a01e08 ffffffff81042d27 000000023fe00000
(XEN)    00000001f20c4000 0000020000000000 00000001acac7000 ffffffff81a01e48
(XEN)    ffffffff81ad2d21 0000000000000000 0000000000000028 0000000040004000
(XEN)    0000000000000000 0000000000000000 0000000000000000 ffffffff81a01ed8
(XEN)    ffffffff81ac293f ffffffff81b46900 0000000000000000 0000000000000000
(XEN)    0000000000000000 ffffffff81a01f00 ffffffff8165fbd1 ffffffff00000010
(XEN)    ffffffff81a01ee8 ffffffff81a01ea8 0000000000000000 ffffffff81a01ec8
(XEN)    ffffffffffffffff ffffffff81b46900 0000000000000000 0000000000000000
(XEN)    0000000000000000 ffffffff81a01f28 ffffffff81abcd62 ffffffff96062000
(XEN)    ffffffff81cc6000 ffffffff81ccd000 ffffffff81b4f2e0 0000000000000000
(XEN)    0000000000000000 0000000000000000 0000000000000000 ffffffff81a01f38
(XEN)    ffffffff81abc5f7 ffffffff81a01ff8 ffffffff81abf0c7 0300000100000032
(XEN)    0000000000000005 0000000000000000 0000000000000000 0000000000000000
(XEN)    0000000000000000 0000000000000000 0000000000000000 0000000000000000
(XEN)    0000000000000000 0000000000000000 0000000000000000 0000000000000000
(XEN)    0000000000000000 0000000000000000 0000000000000000 0000000000000000
(XEN)    0000000000000000 819822831fc9cbf5 000206a700100800 0000000000000001
(XEN)    0000000000000000 0000000000000000 0f00000060c0c748 ccccccccccccc305
(XEN) Domain 0 crashed: rebooting machine in 5 seconds.
(XEN) Resetting with ACPI MEMORY or I/O RESET_REG.


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