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

From: Jan Kiszka
Subject: [Qemu-devel] Re: [PATCH 0/8] kvm: Fixes, cleanups and live migration
Date: Sat, 02 May 2009 00:56:22 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv: Gecko/20080226 SUSE/ Thunderbird/ Mnenhy/

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:

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?


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