[Qemu-devel] BSOD when using Hyper-V extensions with Win2k8R2 guests

[Michael Roth]

Hi Vadim,

I've been trying to use -cpu qemu64,hv_relaxed as a workaround for a
CLOCK_WATCHDOG_TIMEOUT BSOD on Windows 2008 R2 guests when a vcpu's
execution is delayed for an extended period. When I do this however I get the
following the BSOD:

http://msdn.microsoft.com/en-us/library/windows/hardware/ff559206(v=vs.85).aspx

I've also tried -cpu qemu64,hv_spinlocks=4 and -cpu qemu64,hv_vapic as a
sanity check and this results in the same error being thrown.

Host is RHEL6.1 using latest qemu.git, guests are win2k8 server r2 (same
behavior for both SP0 and SP1). Here's the full command-line:

qemu-upstream -L ../qemu-build/pc-bios -cpu qemu64,hv_relaxed --enable-kvm \
    -M pc-1.1 -enable-kvm -m 4096 -smp 4,sockets=4,cores=1,threads=1 \
    -name ichigo-dom45 -nodefconfig -nodefaults -rtc base=utc,driftfix=slew \
    -drive 
file=/scratch/mdroth/win2k8r2sp1.raw,if=none,id=drive0,format=raw,cache=writethrough,snapshot=on
 \
    -device virtio-blk-pci,bus=pci.0,drive=drive0,id=disk0,bootindex=1 \
    -netdev tap,id=hostnet0,script=/etc/qemu-ifup \
    -device 
virtio-net-pci,netdev=hostnet0,id=net0,mac=00:FF:FE:00:00:2d,bus=pci.0 \
    -device virtio-balloon-pci,id=balloon0,bus=pci.0 \
    -usb -device usb-tablet,id=input0 -vnc 0.0.0.0:45 -vga cirrus

Unfortunately the BSOD is too early to get a kernel dump, but here are
the error params in case that's useful:

0xFC0000096, 0xF800027F6200, 0x0, 0x0

Let me know if you need any other details.

Thanks!