[Qemu-devel] Re: [PATCH 0/8] kvm: Fixes, cleanups and live migration

[Jan Kiszka <jan.kiszka@web.de>]

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Anthony Liguori wrote:
> Jan Kiszka wrote:
>> Besides refreshed versions of my already posted fixes and cleanups for
>> KVM, this series comes with patches to enable live migration in KVM
>> mode. If there is still some migration bit missing compared to qemu-kvm,
>> please let me know.
>>   
> 
> In qemu-kvm, we also save:
> 
> MSR_IA32_TSC

That should be cured by patch 9 now. At least it works for me (TM).

> mp_state

There is no mp_state upstream yet.

> interrupt_bitmap
> 
> In QEMU, we probably should just emulate MSR_IA32_TSC and then we can
> reuse that for save/restore.
> 
> interrupt_bitmap is a bit more tricky.  It only ever can have one bit
> set AFAICT but I don't see anything that we're currently saving that
> maps to it which leads me to wonder why KVM needs it and QEMU doesn't.

As far as I understood it, interrupt_bitmap will become relevant for
in-kernel irqchips.

Hmm, I wonder if we should pick up the change and align the CPU on-disk
format with KVM in revision 9, even if we do not yet need all fields.
What do you think?

Jan


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