[Qemu-devel] Re: [PATCH] qemu/virtio: move features to an inline function
Avi Kivity
avi at redhat.com
Thu Aug 13 02:28:52 PDT 2009
On 08/13/2009 09:15 AM, Michael S. Tsirkin wrote:
>
>> I wonder though if mmu notifiers can be used to make it transparent...
>>
>
> Maybe they can, but that decision belongs to KVM.
> Avi, what do you think?
>
>
I don't see how mmu notifiers help. You can use mmu notifiers to sync
an external mmu to the linux pagetables, but that's not the case here.
I see the following options:
- mprotect() guest memory, trap faults, mprotect() back
Will work, but exceedingly slowly and wastefully
- add a generic user visible dirty bit tracking based on linux ptes
A lot of work, not sure if useful beyond kvm
- implement vhost dirty bit tracking
Not too difficult; not sure if it's worth the effort though
- reuse the kvm dirty bitmap
Not too difficult but introduces tight coupling between vhost and kvm
which might slow down development
- drop to userspace for live migration
Reuse qemu code, lose some performance
--
error compiling committee.c: too many arguments to function
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