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[Xen-devel] guest crash in wrmsr_hypervisor_regs if hypercall page is paged out

  • To: xen-devel@xxxxxxxxxxxxx
  • From: Olaf Hering <olaf@xxxxxxxxx>
  • Date: Tue, 30 Apr 2013 20:19:17 +0200
  • Delivery-date: Tue, 30 Apr 2013 18:19:36 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xen.org>

With current xen-unstable I see this guest crash if the gfn 169ff is
paged out. The xenpaging -v output shows that 169ff is populated, but
appearently wrmsr_hypervisor_regs does not like the resulting mfn?!

(XEN) HVM10: HVM Loader
(XEN) HVM10: Detected Xen v4.3.26939-20130430
(XEN) HVM10: Xenbus rings @0xfeffc000, event channel 6
(XEN) HVM10: System requested SeaBIOS
(XEN) HVM10: CPU speed is 2926 MHz
(XEN) irq.c:270: Dom10 PCI link 0 changed 0 -> 5
(XEN) HVM10: PCI-ISA link 0 routed to IRQ5
(XEN) irq.c:270: Dom10 PCI link 1 changed 0 -> 10
(XEN) HVM10: PCI-ISA link 1 routed to IRQ10
(XEN) irq.c:270: Dom10 PCI link 2 changed 0 -> 11
(XEN) HVM10: PCI-ISA link 2 routed to IRQ11
(XEN) irq.c:270: Dom10 PCI link 3 changed 0 -> 5
(XEN) HVM10: PCI-ISA link 3 routed to IRQ5
(XEN) HVM10: pci dev 01:2 INTD->IRQ5
(XEN) HVM10: pci dev 01:3 INTA->IRQ10
(XEN) HVM10: pci dev 03:0 INTA->IRQ5
(XEN) HVM10: pci dev 02:0 bar 10 size lx: 02000000
(XEN) HVM10: pci dev 03:0 bar 14 size lx: 01000000
(XEN) HVM10: pci dev 02:0 bar 30 size lx: 00010000
(XEN) HVM10: pci dev 02:0 bar 14 size lx: 00001000
(XEN) HVM10: pci dev 03:0 bar 10 size lx: 00000100
(XEN) HVM10: pci dev 01:2 bar 20 size lx: 00000020
(XEN) HVM10: pci dev 01:1 bar 20 size lx: 00000010
(XEN) HVM10: Multiprocessor initialisation:
(XEN) HVM10:  - CPU0 ... 40-bit phys ... fixed MTRRs ... var MTRRs [2/8] ... 
(XEN) HVM10:  - CPU1 ... 40-bit phys ... fixed MTRRs ... var MTRRs [2/8] ... 
(XEN) HVM10:  - CPU2 ... 40-bit phys ... fixed MTRRs ... var MTRRs [2/8] ... 
(XEN) HVM10:  - CPU3 ... 40-bit phys ... fixed MTRRs ... var MTRRs [2/8] ... 
(XEN) HVM10: Testing HVM environment:
(XEN) HVM10:  - REP INSB across page boundaries ... passed
(XEN) HVM10:  - GS base MSRs and SWAPGS ... passed
(XEN) HVM10: Passed 2 of 2 tests
(XEN) HVM10: Writing SMBIOS tables ...
(XEN) HVM10: Loading SeaBIOS ...
(XEN) HVM10: Creating MP tables ...
(XEN) HVM10: Loading ACPI ...
(XEN) HVM10: vm86 TSS at fc00a100
(XEN) HVM10: BIOS map:
(XEN) HVM10:  10000-100d3: Scratch space
(XEN) HVM10:  e0000-fffff: Main BIOS
(XEN) HVM10: E820 table:
(XEN) HVM10:  [00]: 00000000:00000000 - 00000000:000a0000: RAM
(XEN) HVM10:  HOLE: 00000000:000a0000 - 00000000:000e0000
(XEN) HVM10:  [01]: 00000000:000e0000 - 00000000:00100000: RESERVED
(XEN) HVM10:  [02]: 00000000:00100000 - 00000000:16a00000: RAM
(XEN) HVM10:  HOLE: 00000000:16a00000 - 00000000:fc000000
(XEN) HVM10:  [03]: 00000000:fc000000 - 00000001:00000000: RESERVED
(XEN) HVM10: Invoking SeaBIOS ...
(XEN) HVM10: SeaBIOS (version ?-20130430_174224-bax)
(XEN) HVM10:
(XEN) HVM10: Found Xen hypervisor signature at 40000000
(XEN) HVM10: xen: copy e820...
(XEN) HVM10: Ram Size=0x16a00000 (0x0000000000000000 high)
(XEN) HVM10: Relocating low data from 0x000e2490 to 0x000ef790 (size 2156)
(XEN) HVM10: Relocating init from 0x000e2cfc to 0x169e20f0 (size 56804)
(XEN) HVM10: CPU Mhz=2928
(XEN) HVM10: Found 7 PCI devices (max PCI bus is 00)
(XEN) HVM10: Allocated Xen hypercall page at 169ff000
(XEN) traps.c:654:d10 Bad GMFN 169ff (MFN 3e900000000) to MSR 40000000
(XEN) HVM10: Detected Xen v4.3
(XEN) io.c:201:d10 MMIO emulation failed @ 0008:c2c2c2c2: 18 7c 55 6d 03 83 ff 
ff 10 7c
(XEN) hvm.c:1253:d10 Triple fault on VCPU0 - invoking HVM shutdown action 1.
(XEN) HVM11: HVM Loader
(XEN) HVM11: Detected Xen v4.3.26939-20130430

The .cfg file looks like this:

vfb = [

I'm using "xl -v -v create -d -p -f domU.cfg" to start it, then run xenpaging
manually, then unpause the guest.


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