On 12/03/2009 09:23 PM, Jan Kiszka wrote:
Jan Kiszka wrote:
Problem 2
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Setup: qemu head with vmstate fixes. kvm-kmod master, 64-bit host& guest.
Effect: The migration target either locks up or reboots immediately.
I've nailed this down to 84d0b66c778d881eafca2a5d0d66678211c4e861. Every
kvm module build before that works, everything including and after
26ede77f536d1bb369527a96c7fe7fdc8ba2f890 shows the effect (everything in
between crashes the host for known reasons). It's still unclear if this
is an kvm-kmod wrapping issue of the user-space return notifiers. Will
check once problem #1 is understood.
It is kernel-related, using kvm.git as host kernel makes no difference.
This may now mean that kvm is buggy or that it triggers some msr
save/restore related issues in qemu. Digging even deeper...
Does calling drop_user_return_notifiers() (static in x86.c, will need
exporting) in vmx_load_host_state() within the preempt-disable region help?
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
