Re: [Qemu-devel] [PATCH 7/7] Fake dirty loggin when it's not there

[Stefano Stabellini]

On Fri, 17 Jul 2009, Alexander Graf wrote:
> Some KVM platforms don't support dirty logging yet, like IA64 and PPC,
> so in order to still have screen updates on those, we need to fake it.
> 
> This patch just tells the getter function for dirty bitmaps, that all
> pages within a slot are dirty when the slot has dirty logging enabled.
> 
> That way we can implement dirty logging on those platforms sometime when
> it drags down performance, but share the rest of the code with dirty
> logging capable platforms.

Isn't it going to be very very slow?
I think a memcmp based approach as a fallback would be a better idea,
and if we could make this generic it would be even better :)