Re: [Qemu-devel] Re: [PATCH 3/3] Add KVM support to QEMU

[Avi Kivity]

Anthony Liguori wrote:
> Another place "hook" is updating a slot's dirty bitmap.  Right now, 
> with my patchset we don't have live migration or the VGA RAM 
> optimization.  There's nothing about the VGA RAM optimization that 
> wouldn't work for QEMU.  I'm not sure that it really is an 
> optimization in the context of TCG, but I certainly don't think it's 
> any worse.  The only thing you really need is to query the KVM dirty 
> bitmap when it comes time to enable start over querying the VGA dirty 
> bits.

I don't understand this.  The VGA optimization really is qemu's, the kvm 
modifications only cater to the different way of getting the dirty bits.

> The same is needed for live migration, so I think what we really need 
> is to change the memory dirty bit tracking API to have a concept of 
> refresh that we can use to hook for KVM.

Can you elaborate on this refresh?

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