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Re: [Xen-devel] frequently ballooning results in qemu exit




> -----Original Message-----
> From: dunlapg@xxxxxxxxx [mailto:dunlapg@xxxxxxxxx] On Behalf Of George
> Dunlap
> Sent: 2013年3月14日 18:17
> To: Hanweidong
> Cc: xen-devel@xxxxxxxxxxxxx; Gonglei (Arei); Yanqiangjun; Anthony
> PERARD; Andrew Cooper
> Subject: Re: [Xen-devel] frequently ballooning results in qemu exit
> 
> On Wed, Mar 13, 2013 at 1:50 PM, Hanweidong <hanweidong@xxxxxxxxxx>
> wrote:
> > We created a 64bit SLES11 SP1 guest, and then used a script to change
> memory (using mem-set command) periodically (in 1 second): set 1G, set
> 2G, set 1G, set 2G, and so on.
> > After a few minutes, we encountered QEMU exit due to SIGBUS error.
> Below is the call trace captured by gdb:
> >
> > The call trace:
> > Program received signal SIGBUS, Bus error.
> > 0x00007f94f74773d7 in memcpy () from /lib64/libc.so.6
> > (gdb) bt
> > #0  0x00007f94f74773d7 in memcpy () from /lib64/libc.so.6
> > #1  0x00007f94fa67016d in address_space_rw (as=<optimized out>,
> addr=2042531840, buf=0x7fffa36accf8 "", len=4, is_write=true) at
> /usr/include/bits/string3.h:52
> > #2  0x00007f94fa747cf0 in rw_phys_req_item (rw=<optimized out>,
> val=<optimized out>, i=<optimized out>, req=<optimized out>,
> addr=<optimized out>)
> >     at /opt/new/tools/qemu-xen-dir/xen-all.c:709
> > #3  write_phys_req_item (val=<optimized out>, i=<optimized out>,
> req=<optimized out>, addr=<optimized out>) at /opt/new/tools/qemu-xen-
> dir/xen-all.c:720
> > #4  cpu_ioreq_pio (req=<optimized out>) at /opt/new/tools/qemu-xen-
> dir/xen-all.c:736
> > #5  handle_ioreq (req=0x7f94fa464000) at /opt/new/tools/qemu-xen-
> dir/xen-all.c:793
> > #6  0x00007f94fa748abe in cpu_handle_ioreq (opaque=0x7f94fb39d3f0) at
> /opt/new/tools/qemu-xen-dir/xen-all.c:868
> > #7  0x00007f94fa5e3262 in qemu_iohandler_poll (readfds=0x7f94faeea7a0
> <rfds>, writefds=0x7f94faeea820 <wfds>, xfds=<optimized out>,
> ret=<optimized out>) at iohandler.c:125
> > #8  0x00007f94fa5ec51d in main_loop_wait (nonblocking=<optimized out>)
> at main-loop.c:418
> > #9  0x00007f94fa6616dc in main_loop () at vl.c:1770
> > #10 main (argc=<optimized out>, argv=<optimized out>, envp=<optimized
> out>) at vl.c:3999
> >
> > It looks mapcache has something wrong because memcpy failed with the
> address from mapcache. Any ideas about this issue? Thanks!
> 
> Which version of Xen and qemu are you using?  In particular,
> qemu-upstream (aka qemu-xen) or qemu-traditional?  And what guest are
> you using?  Is there anything on the xen console (either via the
> serial port or 'xl dmesg')?

Xen changeset is 26580, qemu commit is 656365a38e41a5b8a2c4d5ab2ada9fbf231f1ebc.
BTW, it's no problem when using qemu-traditional. The guest is 64bit SLES11 SP1.
The 'xl dmesg' output is as below (we did the test with 3 guests, it can be
reproduced very quickly (about 20 seconds)):

(XEN) HVM25: HVM Loader
(XEN) HVM25: Detected Xen v4.3-unstable
(XEN) HVM25: Xenbus rings @0xfeffc000, event channel 4
(XEN) HVM25: System requested SeaBIOS
(XEN) HVM25: CPU speed is 2500 MHz
(XEN) irq.c:270: Dom25 PCI link 0 changed 0 -> 5
(XEN) HVM25: PCI-ISA link 0 routed to IRQ5
(XEN) irq.c:270: Dom25 PCI link 1 changed 0 -> 10
(XEN) HVM25: PCI-ISA link 1 routed to IRQ10
(XEN) irq.c:270: Dom25 PCI link 2 changed 0 -> 11
(XEN) HVM25: PCI-ISA link 2 routed to IRQ11
(XEN) irq.c:270: Dom25 PCI link 3 changed 0 -> 5
(XEN) HVM25: PCI-ISA link 3 routed to IRQ5
(XEN) HVM25: pci dev 01:2 INTD->IRQ5
(XEN) HVM25: pci dev 01:3 INTA->IRQ10
(XEN) HVM25: Randy: pci_setup 0: mmio_total=0x2000000 bar_sz=0x2000000
(XEN) HVM25: Randy: pci_setup 0: mmio_total=0x2001000 bar_sz=0x1000
(XEN) HVM25: Randy: pci_setup 0: mmio_total=0x2011000 bar_sz=0x10000
(XEN) HVM25: Randy: pci_setup 0: mmio_total=0x3011000 bar_sz=0x1000000
(XEN) HVM25: pci dev 03:0 INTA->IRQ5
(XEN) HVM25: Randy: pci_setup 0: mmio_total=0x3011100 bar_sz=0x100
(XEN) HVM25: Randy: pci_setup 0: mmio_total=0x3021100 bar_sz=0x10000
(XEN) HVM25: pci dev 04:0 INTA->IRQ5
(XEN) HVM25: Randy: pci_setup 1: mmio_total=0x3021100 pci_mem_start=0xf0000000 
pci_mem_end=
(XEN) HVM25: 0xfc000000 PCI_MEM_START=0xf0000000 PCI_MEM_END=0xfc000000
(XEN) HVM25: Randy: pci_setup 2: mmio_total=0x3021100 pci_mem_start=0xf0000000 
pci_mem_end=
(XEN) HVM25: 0xfc000000
(XEN) HVM25: Randy: pci_setup 3: low_mem_pgend:0x7f800 high_mem_pgend:0x0 
reserved_mem_pgst
(XEN) HVM25: art:0xfeff8
(XEN) HVM25: Randy: pci_setup: mmio_left: 0xc000000
(XEN) HVM25: pci dev 02:0 bar 10 size 2000000: f0000008
(XEN) HVM25: pci dev 03:0 bar 14 size 1000000: f2000008
(XEN) HVM25: pci dev 02:0 bar 30 size 10000: f3000000
(XEN) HVM25: pci dev 04:0 bar 30 size 10000: f3010000
(XEN) HVM25: pci dev 02:0 bar 14 size 1000: f3020000
(XEN) HVM25: pci dev 03:0 bar 10 size 100: 0000c001
(XEN) HVM25: pci dev 04:0 bar 10 size 100: 0000c101
(XEN) HVM25: pci dev 04:0 bar 14 size 100: f3021000
(XEN) HVM25: pci dev 01:2 bar 20 size 20: 0000c201
(XEN) HVM25: pci dev 01:1 bar 20 size 10: 0000c221
(XEN) HVM25: Multiprocessor initialisation:
(XEN) HVM25:  - CPU0 ... 46-bit phys ... fixed MTRRs ... var MTRRs [2/8] ... 
done.
(XEN) HVM25:  - CPU1 ... 46-bit phys ... fixed MTRRs ... var MTRRs [2/8] ... 
done.
(XEN) HVM25: Testing HVM environment:
(XEN) HVM25:  - REP INSB across page boundaries ... passed
(XEN) HVM25:  - GS base MSRs and SWAPGS ... passed
(XEN) HVM25: Passed 2 of 2 tests
(XEN) HVM25: Writing SMBIOS tables ...
(XEN) HVM25: Loading SeaBIOS ...
(XEN) HVM25: Creating MP tables ...
(XEN) HVM25: Loading ACPI ...
(XEN) HVM25: vm86 TSS at fc00a080
(XEN) HVM25: BIOS map:
(XEN) HVM25:  10000-100d3: Scratch space
(XEN) HVM25:  e0000-fffff: Main BIOS
(XEN) HVM25: E820 table:
(XEN) HVM25:  [00]: 00000000:00000000 - 00000000:000a0000: RAM
(XEN) HVM25:  HOLE: 00000000:000a0000 - 00000000:000e0000
(XEN) HVM25:  [01]: 00000000:000e0000 - 00000000:00100000: RESERVED
(XEN) HVM25:  [02]: 00000000:00100000 - 00000000:7f800000: RAM
(XEN) HVM25:  HOLE: 00000000:7f800000 - 00000000:fc000000
(XEN) HVM25:  [03]: 00000000:fc000000 - 00000001:00000000: RESERVED
(XEN) HVM25: Invoking SeaBIOS ...
(XEN) HVM25: SeaBIOS (version rel-1.7.1-0-g51755c3-20130306_205414-linux-DPMZPO)
(XEN) HVM25: 
(XEN) HVM25: Found Xen hypervisor signature at 40000000
(XEN) HVM25: xen: copy e820...
(XEN) HVM25: Ram Size=0x7f800000 (0x0000000000000000 high)
(XEN) HVM25: Relocating low data from 0x000e2490 to 0x000ef790 (size 2156)
(XEN) HVM25: Relocating init from 0x000e2cfc to 0x7f7e20f0 (size 56804)
(XEN) HVM25: CPU Mhz=2500
(XEN) HVM25: Found 8 PCI devices (max PCI bus is 00)
(XEN) HVM25: Allocated Xen hypercall page at 7f7ff000
(XEN) HVM25: Detected Xen v4.3-unstable
(XEN) HVM25: Found 2 cpu(s) max supported 2 cpu(s)
(XEN) HVM25: xen: copy BIOS tables...
(XEN) HVM25: Copying SMBIOS entry point from 0x00010010 to 0x000fdb10
(XEN) HVM25: Copying MPTABLE from 0xfc001170/fc001180 to 0x000fda10
(XEN) HVM25: Copying PIR from 0x00010030 to 0x000fd990
(XEN) HVM25: Copying ACPI RSDP from 0x000100b0 to 0x000fd960
(XEN) HVM25: Scan for VGA option rom
(XEN) HVM25: Running option rom at c000:0003
(XEN) stdvga.c:147:d25 entering stdvga and caching modes
(XEN) HVM25: Turning on vga text mode console
(XEN) HVM25: SeaBIOS (version rel-1.7.1-0-g51755c3-20130306_205414-linux-DPMZPO)
(XEN) HVM25: 
(XEN) HVM25: UHCI init on dev 00:01.2 (io=c200)
(XEN) HVM25: Found 1 lpt ports
(XEN) HVM25: Found 1 serial ports
(XEN) HVM25: ATA controller 1 at 1f0/3f4/c220 (irq 14 dev 9)
(XEN) HVM25: ATA controller 2 at 170/374/c228 (irq 15 dev 9)
(XEN) HVM25: ata0-0: QEMU HARDDISK ATA-7 Hard-Disk (10240 MiBytes)
(XEN) HVM25: Searching bootorder for: /pci@i0cf8/*@1,1/drive@0/disk@0
(XEN) HVM25: DVD/CD [ata1-0: QEMU DVD-ROM ATAPI-4 DVD/CD]
(XEN) HVM25: Searching bootorder for: /pci@i0cf8/*@1,1/drive@1/disk@0
(XEN) HVM25: PS2 keyboard initialized
(XEN) HVM25: All threads complete.
(XEN) HVM25: Scan for option roms
(XEN) HVM25: Running option rom at c900:0003
(XEN) HVM25: pmm call arg1=1
(XEN) HVM25: pmm call arg1=0
(XEN) HVM25: pmm call arg1=1
(XEN) HVM25: pmm call arg1=0
(XEN) HVM25: Searching bootorder for: /pci@i0cf8/*@4
(XEN) HVM25: Press F12 for boot menu.
(XEN) HVM25: 
(XEN) HVM26: HVM Loader
(XEN) HVM26: Detected Xen v4.3-unstable
(XEN) HVM26: Xenbus rings @0xfeffc000, event channel 4
(XEN) HVM26: System requested SeaBIOS
(XEN) HVM26: CPU speed is 2500 MHz
(XEN) irq.c:270: Dom26 PCI link 0 changed 0 -> 5
(XEN) HVM26: PCI-ISA link 0 routed to IRQ5
(XEN) irq.c:270: Dom26 PCI link 1 changed 0 -> 10
(XEN) HVM26: PCI-ISA link 1 routed to IRQ10
(XEN) irq.c:270: Dom26 PCI link 2 changed 0 -> 11
(XEN) HVM26: PCI-ISA link 2 routed to IRQ11
(XEN) irq.c:270: Dom26 PCI link 3 changed 0 -> 5
(XEN) HVM26: PCI-ISA link 3 routed to IRQ5
(XEN) HVM26: pci dev 01:2 INTD->IRQ5
(XEN) HVM26: pci dev 01:3 INTA->IRQ10
(XEN) HVM26: Randy: pci_setup 0: mmio_total=0x2000000 bar_sz=0x2000000
(XEN) HVM26: Randy: pci_setup 0: mmio_total=0x2001000 bar_sz=0x1000
(XEN) HVM26: Randy: pci_setup 0: mmio_total=0x2011000 bar_sz=0x10000
(XEN) HVM26: Randy: pci_setup 0: mmio_total=0x3011000 bar_sz=0x1000000
(XEN) HVM26: pci dev 03:0 INTA->IRQ5
(XEN) HVM26: Randy: pci_setup 0: mmio_total=0x3011100 bar_sz=0x100
(XEN) HVM26: Randy: pci_setup 0: mmio_total=0x3021100 bar_sz=0x10000
(XEN) HVM26: pci dev 04:0 INTA->IRQ5
(XEN) HVM26: Randy: pci_setup 1: mmio_total=0x3021100 pci_mem_start=0xf0000000 
pci_mem_end=
(XEN) HVM26: 0xfc000000 PCI_MEM_START=0xf0000000 PCI_MEM_END=0xfc000000
(XEN) HVM26: Randy: pci_setup 2: mmio_total=0x3021100 pci_mem_start=0xf0000000 
pci_mem_end=
(XEN) HVM26: 0xfc000000
(XEN) HVM26: Randy: pci_setup 3: low_mem_pgend:0x7f800 high_mem_pgend:0x0 
reserved_mem_pgst
(XEN) HVM26: art:0xfeff8
(XEN) HVM26: Randy: pci_setup: mmio_left: 0xc000000
(XEN) HVM26: pci dev 02:0 bar 10 size 2000000: f0000008
(XEN) HVM26: pci dev 03:0 bar 14 size 1000000: f2000008
(XEN) HVM26: pci dev 02:0 bar 30 size 10000: f3000000
(XEN) HVM26: pci dev 04:0 bar 30 size 10000: f3010000
(XEN) HVM26: pci dev 02:0 bar 14 size 1000: f3020000
(XEN) HVM26: pci dev 03:0 bar 10 size 100: 0000c001
(XEN) HVM26: pci dev 04:0 bar 10 size 100: 0000c101
(XEN) HVM26: pci dev 04:0 bar 14 size 100: f3021000
(XEN) HVM26: pci dev 01:2 bar 20 size 20: 0000c201
(XEN) HVM26: pci dev 01:1 bar 20 size 10: 0000c221
(XEN) HVM26: Multiprocessor initialisation:
(XEN) HVM26:  - CPU0 ... 46-bit phys ... fixed MTRRs ... var MTRRs [2/8] ... 
done.
(XEN) HVM26:  - CPU1 ... 46-bit phys ... fixed MTRRs ... var MTRRs [2/8] ... 
done.
(XEN) HVM26: Testing HVM environment:
(XEN) HVM26:  - REP INSB across page boundaries ... passed
(XEN) HVM26:  - GS base MSRs and SWAPGS ... passed
(XEN) HVM26: Passed 2 of 2 tests
(XEN) HVM26: Writing SMBIOS tables ...
(XEN) HVM26: Loading SeaBIOS ...
(XEN) HVM26: Creating MP tables ...
(XEN) HVM26: Loading ACPI ...
(XEN) HVM26: vm86 TSS at fc00a080
(XEN) HVM26: BIOS map:
(XEN) HVM26:  10000-100d3: Scratch space
(XEN) HVM26:  e0000-fffff: Main BIOS
(XEN) HVM26: E820 table:
(XEN) HVM26:  [00]: 00000000:00000000 - 00000000:000a0000: RAM
(XEN) HVM26:  HOLE: 00000000:000a0000 - 00000000:000e0000
(XEN) HVM26:  [01]: 00000000:000e0000 - 00000000:00100000: RESERVED
(XEN) HVM26:  [02]: 00000000:00100000 - 00000000:7f800000: RAM
(XEN) HVM26:  HOLE: 00000000:7f800000 - 00000000:fc000000
(XEN) HVM26:  [03]: 00000000:fc000000 - 00000001:00000000: RESERVED
(XEN) HVM26: Invoking SeaBIOS ...
(XEN) HVM26: SeaBIOS (version rel-1.7.1-0-g51755c3-20130306_205414-linux-DPMZPO)
(XEN) HVM26: 
(XEN) HVM26: Found Xen hypervisor signature at 40000000
(XEN) HVM26: xen: copy e820...
(XEN) HVM26: Ram Size=0x7f800000 (0x0000000000000000 high)
(XEN) HVM26: Relocating low data from 0x000e2490 to 0x000ef790 (size 2156)
(XEN) HVM26: Relocating init from 0x000e2cfc to 0x7f7e20f0 (size 56804)
(XEN) HVM26: CPU Mhz=2500
(XEN) HVM26: Found 8 PCI devices (max PCI bus is 00)
(XEN) HVM26: Allocated Xen hypercall page at 7f7ff000
(XEN) HVM26: Detected Xen v4.3-unstable
(XEN) HVM26: Found 2 cpu(s) max supported 2 cpu(s)
(XEN) HVM26: xen: copy BIOS tables...
(XEN) HVM26: Copying SMBIOS entry point from 0x00010010 to 0x000fdb10
(XEN) HVM26: Copying MPTABLE from 0xfc001170/fc001180 to 0x000fda10
(XEN) HVM26: Copying PIR from 0x00010030 to 0x000fd990
(XEN) HVM26: Copying ACPI RSDP from 0x000100b0 to 0x000fd960
(XEN) HVM26: Scan for VGA option rom
(XEN) HVM26: Running option rom at c000:0003
(XEN) stdvga.c:147:d26 entering stdvga and caching modes
(XEN) HVM26: Turning on vga text mode console
(XEN) HVM26: SeaBIOS (version rel-1.7.1-0-g51755c3-20130306_205414-linux-DPMZPO)
(XEN) HVM26: 
(XEN) HVM26: UHCI init on dev 00:01.2 (io=c200)
(XEN) HVM26: Found 1 lpt ports
(XEN) HVM26: Found 1 serial ports
(XEN) HVM26: ATA controller 1 at 1f0/3f4/c220 (irq 14 dev 9)
(XEN) HVM26: ATA controller 2 at 170/374/c228 (irq 15 dev 9)
(XEN) HVM26: ata0-0: QEMU HARDDISK ATA-7 Hard-Disk (10240 MiBytes)
(XEN) HVM26: Searching bootorder for: /pci@i0cf8/*@1,1/drive@0/disk@0
(XEN) HVM26: DVD/CD [ata1-0: QEMU DVD-ROM ATAPI-4 DVD/CD]
(XEN) HVM26: Searching bootorder for: /pci@i0cf8/*@1,1/drive@1/disk@0
(XEN) HVM26: PS2 keyboard initialized
(XEN) HVM27: HVM Loader
(XEN) HVM27: Detected Xen v4.3-unstable
(XEN) HVM27: Xenbus rings @0xfeffc000, event channel 4
(XEN) HVM27: System requested SeaBIOS
(XEN) HVM27: CPU speed is 2500 MHz
(XEN) irq.c:270: Dom27 PCI link 0 changed 0 -> 5
(XEN) HVM27: PCI-ISA link 0 routed to IRQ5
(XEN) irq.c:270: Dom27 PCI link 1 changed 0 -> 10
(XEN) HVM27: PCI-ISA link 1 routed to IRQ10
(XEN) irq.c:270: Dom27 PCI link 2 changed 0 -> 11
(XEN) HVM27: PCI-ISA link 2 routed to IRQ11
(XEN) irq.c:270: Dom27 PCI link 3 changed 0 -> 5
(XEN) HVM27: PCI-ISA link 3 routed to IRQ5
(XEN) HVM27: pci dev 01:2 INTD->IRQ5
(XEN) HVM27: pci dev 01:3 INTA->IRQ10
(XEN) HVM27: Randy: pci_setup 0: mmio_total=0x2000000 bar_sz=0x2000000
(XEN) HVM27: Randy: pci_setup 0: mmio_total=0x2001000 bar_sz=0x1000
(XEN) HVM27: Randy: pci_setup 0: mmio_total=0x2011000 bar_sz=0x10000
(XEN) HVM27: Randy: pci_setup 0: mmio_total=0x3011000 bar_sz=0x1000000
(XEN) HVM27: pci dev 03:0 INTA->IRQ5
(XEN) HVM26: All threads complete.
(XEN) HVM26: Scan for option roms
(XEN) HVM27: Randy: pci_setup 0: mmio_total=0x3011100 bar_sz=0x100
(XEN) HVM27: Randy: pci_setup 0: mmio_total=0x3021100 bar_sz=0x10000
(XEN) HVM27: pci dev 04:0 INTA->IRQ5
(XEN) HVM26: Running option rom at c900:0003
(XEN) HVM26: pmm call arg1=1
(XEN) HVM26: pmm call arg1=0
(XEN) HVM26: pmm call arg1=1
(XEN) HVM26: pmm call arg1=0
(XEN) HVM27: Randy: pci_setup 1: mmio_total=0x3021100 pci_mem_start=0xf0000000 
pci_mem_end=
(XEN) HVM27: 0xfc000000 PCI_MEM_START=0xf0000000 PCI_MEM_END=0xfc000000
(XEN) HVM27: Randy: pci_setup 2: mmio_total=0x3021100 pci_mem_start=0xf0000000 
pci_mem_end=
(XEN) HVM27: 0xfc000000
(XEN) HVM27: Randy: pci_setup 3: low_mem_pgend:0x7f800 high_mem_pgend:0x0 
reserved_mem_pgst
(XEN) HVM27: art:0xfeff8
(XEN) HVM27: Randy: pci_setup: mmio_left: 0xc000000
(XEN) HVM27: pci dev 02:0 bar 10 size 2000000: f0000008
(XEN) HVM27: pci dev 03:0 bar 14 size 1000000: f2000008
(XEN) HVM27: pci dev 02:0 bar 30 size 10000: f3000000
(XEN) HVM27: pci dev 04:0 bar 30 size 10000: f3010000
(XEN) HVM27: pci dev 02:0 bar 14 size 1000: f3020000
(XEN) HVM27: pci dev 03:0 bar 10 size 100: 0000c001
(XEN) HVM27: pci dev 04:0 bar 10 size 100: 0000c101
(XEN) HVM27: pci dev 04:0 bar 14 size 100: f3021000
(XEN) HVM27: pci dev 01:2 bar 20 size 20: 0000c201
(XEN) HVM27: pci dev 01:1 bar 20 size 10: 0000c221
(XEN) HVM27: Multiprocessor initialisation:
(XEN) HVM27:  - CPU0 ... 46-bit phys ... fixed MTRRs ... var MTRRs [2/8] ... 
done.
(XEN) HVM27:  - CPU1 ... 46-bit phys ... fixed MTRRs ... var MTRRs [2/8] ... 
done.
(XEN) HVM27: Testing HVM environment:
(XEN) HVM26: Searching bootorder for: /pci@i0cf8/*@4
(XEN) HVM27:  - REP INSB across page boundaries ... passed
(XEN) HVM27:  - GS base MSRs and SWAPGS ... passed
(XEN) HVM27: Passed 2 of 2 tests
(XEN) HVM27: Writing SMBIOS tables ...
(XEN) HVM27: Loading SeaBIOS ...
(XEN) HVM27: Creating MP tables ...
(XEN) HVM27: Loading ACPI ...
(XEN) HVM27: vm86 TSS at fc00a080
(XEN) HVM27: BIOS map:
(XEN) HVM27:  10000-100d3: Scratch space
(XEN) HVM27:  e0000-fffff: Main BIOS
(XEN) HVM27: E820 table:
(XEN) HVM27:  [00]: 00000000:00000000 - 00000000:000a0000: RAM
(XEN) HVM27:  HOLE: 00000000:000a0000 - 00000000:000e0000
(XEN) HVM27:  [01]: 00000000:000e0000 - 00000000:00100000: RESERVED
(XEN) HVM27:  [02]: 00000000:00100000 - 00000000:7f800000: RAM
(XEN) HVM27:  HOLE: 00000000:7f800000 - 00000000:fc000000
(XEN) HVM27:  [03]: 00000000:fc000000 - 00000001:00000000: RESERVED
(XEN) HVM27: Invoking SeaBIOS ...
(XEN) HVM27: SeaBIOS (version rel-1.7.1-0-g51755c3-20130306_205414-linux-DPMZPO)
(XEN) HVM27: 
(XEN) HVM27: Found Xen hypervisor signature at 40000000
(XEN) HVM27: xen: copy e820...
(XEN) HVM27: Ram Size=0x7f800000 (0x0000000000000000 high)
(XEN) HVM27: Relocating low data from 0x000e2490 to 0x000ef790 (size 2156)
(XEN) HVM27: Relocating init from 0x000e2cfc to 0x7f7e20f0 (size 56804)
(XEN) HVM27: CPU Mhz=2500
(XEN) HVM27: Found 8 PCI devices (max PCI bus is 00)
(XEN) HVM27: Allocated Xen hypercall page at 7f7ff000
(XEN) HVM27: Detected Xen v4.3-unstable
(XEN) HVM27: Found 2 cpu(s) max supported 2 cpu(s)
(XEN) HVM27: xen: copy BIOS tables...
(XEN) HVM27: Copying SMBIOS entry point from 0x00010010 to 0x000fdb10
(XEN) HVM27: Copying MPTABLE from 0xfc001170/fc001180 to 0x000fda10
(XEN) HVM26: Press F12 for boot menu.
(XEN) HVM27: Copying PIR from 0x00010030 to 0x000fd990
(XEN) HVM27: Copying ACPI RSDP from 0x000100b0 to 0x000fd960
(XEN) HVM27: Scan for VGA option rom
(XEN) HVM26: 
(XEN) HVM27: Running option rom at c000:0003
(XEN) stdvga.c:147:d27 entering stdvga and caching modes
(XEN) HVM27: Turning on vga text mode console
(XEN) HVM27: SeaBIOS (version rel-1.7.1-0-g51755c3-20130306_205414-linux-DPMZPO)
(XEN) HVM27: 
(XEN) HVM27: UHCI init on dev 00:01.2 (io=c200)
(XEN) HVM27: Found 1 lpt ports
(XEN) HVM27: Found 1 serial ports
(XEN) HVM27: ATA controller 1 at 1f0/3f4/c220 (irq 14 dev 9)
(XEN) HVM27: ATA controller 2 at 170/374/c228 (irq 15 dev 9)
(XEN) HVM27: ata0-0: QEMU HARDDISK ATA-7 Hard-Disk (10240 MiBytes)
(XEN) HVM27: Searching bootorder for: /pci@i0cf8/*@1,1/drive@0/disk@0
(XEN) HVM27: DVD/CD [ata1-0: QEMU DVD-ROM ATAPI-4 DVD/CD]
(XEN) HVM27: Searching bootorder for: /pci@i0cf8/*@1,1/drive@1/disk@0
(XEN) HVM27: PS2 keyboard initialized
(XEN) HVM27: All threads complete.
(XEN) HVM27: Scan for option roms
(XEN) HVM27: Running option rom at c900:0003
(XEN) HVM27: pmm call arg1=1
(XEN) HVM27: pmm call arg1=0
(XEN) HVM27: pmm call arg1=1
(XEN) HVM27: pmm call arg1=0
(XEN) HVM27: Searching bootorder for: /pci@i0cf8/*@4
(XEN) HVM27: Press F12 for boot menu.
(XEN) HVM27: 
(XEN) HVM25: drive 0x000fd910: PCHS=16383/16/63 translation=lba 
LCHS=1024/255/63 s=20971521
(XEN) HVM25: 
(XEN) HVM25: Space available for UMB: 000ca000-000ee800
(XEN) HVM25: Returned 61440 bytes of ZoneHigh
(XEN) HVM25: e820 map has 6 items:
(XEN) HVM25:   0: 0000000000000000 - 000000000009fc00 = 1 RAM
(XEN) HVM25:   1: 000000000009fc00 - 00000000000a0000 = 2 RESERVED
(XEN) HVM25:   2: 00000000000f0000 - 0000000000100000 = 2 RESERVED
(XEN) HVM25:   3: 0000000000100000 - 000000007f7ff000 = 1 RAM
(XEN) HVM25:   4: 000000007f7ff000 - 000000007f800000 = 2 RESERVED
(XEN) HVM25:   5: 00000000fc000000 - 0000000100000000 = 2 RESERVED
(XEN) HVM25: enter handle_19:
(XEN) HVM25:   NULL
(XEN) HVM25: Booting from Hard Disk...
(XEN) HVM25: Booting from 0000:7c00
(XEN) stdvga.c:151:d25 leaving stdvga
(XEN) HVM26: drive 0x000fd910: PCHS=16383/16/63 translation=lba 
LCHS=1024/255/63 s=20971521
(XEN) HVM26: 
(XEN) HVM26: Space available for UMB: 000ca000-000ee800
(XEN) HVM26: Returned 61440 bytes of ZoneHigh
(XEN) HVM26: e820 map has 6 items:
(XEN) HVM26:   0: 0000000000000000 - 000000000009fc00 = 1 RAM
(XEN) HVM26:   1: 000000000009fc00 - 00000000000a0000 = 2 RESERVED
(XEN) HVM26:   2: 00000000000f0000 - 0000000000100000 = 2 RESERVED
(XEN) HVM26:   3: 0000000000100000 - 000000007f7ff000 = 1 RAM
(XEN) HVM26:   4: 000000007f7ff000 - 000000007f800000 = 2 RESERVED
(XEN) HVM26:   5: 00000000fc000000 - 0000000100000000 = 2 RESERVED
(XEN) HVM26: enter handle_19:
(XEN) HVM26:   NULL
(XEN) HVM26: Booting from Hard Disk...
(XEN) HVM26: Booting from 0000:7c00
(XEN) stdvga.c:151:d26 leaving stdvga
(XEN) HVM27: drive 0x000fd910: PCHS=16383/16/63 translation=lba 
LCHS=1024/255/63 s=20971521
(XEN) HVM27: 
(XEN) HVM27: Space available for UMB: 000ca000-000ee800
(XEN) HVM27: Returned 61440 bytes of ZoneHigh
(XEN) HVM27: e820 map has 6 items:
(XEN) HVM27:   0: 0000000000000000 - 000000000009fc00 = 1 RAM
(XEN) HVM27:   1: 000000000009fc00 - 00000000000a0000 = 2 RESERVED
(XEN) HVM27:   2: 00000000000f0000 - 0000000000100000 = 2 RESERVED
(XEN) HVM27:   3: 0000000000100000 - 000000007f7ff000 = 1 RAM
(XEN) HVM27:   4: 000000007f7ff000 - 000000007f800000 = 2 RESERVED
(XEN) HVM27:   5: 00000000fc000000 - 0000000100000000 = 2 RESERVED
(XEN) HVM27: enter handle_19:
(XEN) HVM27:   NULL
(XEN) HVM27: Booting from Hard Disk...
(XEN) HVM27: Booting from 0000:7c00
(XEN) stdvga.c:151:d27 leaving stdvga
(XEN) stdvga.c:147:d25 entering stdvga and caching modes
(XEN) stdvga.c:151:d25 leaving stdvga
(XEN) stdvga.c:147:d27 entering stdvga and caching modes
(XEN) stdvga.c:151:d27 leaving stdvga
(XEN) stdvga.c:147:d26 entering stdvga and caching modes
(XEN) stdvga.c:151:d26 leaving stdvga
(XEN) irq.c:270: Dom25 PCI link 0 changed 5 -> 0
(XEN) irq.c:270: Dom25 PCI link 1 changed 10 -> 0
(XEN) irq.c:270: Dom25 PCI link 2 changed 11 -> 0
(XEN) irq.c:270: Dom25 PCI link 3 changed 5 -> 0
(XEN) irq.c:375: Dom25 callback via changed to PCI INTx Dev 0x03 IntA
(XEN) irq.c:270: Dom27 PCI link 0 changed 5 -> 0
(XEN) irq.c:270: Dom27 PCI link 1 changed 10 -> 0
(XEN) irq.c:270: Dom27 PCI link 2 changed 11 -> 0
(XEN) irq.c:270: Dom27 PCI link 3 changed 5 -> 0
(XEN) irq.c:375: Dom27 callback via changed to PCI INTx Dev 0x03 IntA
(XEN) irq.c:270: Dom26 PCI link 0 changed 5 -> 0
(XEN) irq.c:270: Dom26 PCI link 1 changed 10 -> 0
(XEN) irq.c:270: Dom26 PCI link 2 changed 11 -> 0
(XEN) irq.c:270: Dom26 PCI link 3 changed 5 -> 0
(XEN) irq.c:375: Dom26 callback via changed to PCI INTx Dev 0x03 IntA

> 
> At first glance it looks like maybe qemu is trying to access, via the
> mapcache, pages which have been ballooned out.  But it seems like it
> should only be doing so in response to a guest request -- is this
> correct, Anthony?
> 
> Andy, are there any patches in the XenServer qemu patchqueue that
> might be related to this?
> 
>  -George
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