On 11/30/2010 04:50 PM, Anthony Liguori wrote:
That's what the patch set I was alluding to did. Or maybe I imagined
the whole thing.
No, it just split the main bitmap into three bitmaps. I'm suggesting
that we have the dirty interface have two implementations, one that
refers to the 8-bit bitmap when TCG in use and another one that uses
the KVM representation.
TCG really needs multiple dirty bits but KVM doesn't. A shared
implementation really can't be optimal.
Live migration and the framebuffer can certainly share code with kvm and
tcg:
- tcg or kvm maintain an internal bitmap (kvm in the kernel, tcg updates
a private bitmap)
- a dirty log client wants to see an updated bitmap; migration on a new
pass, vga on screen refresh
- ask the producer (kvm or tcg) to fetch-and-clear a dirty bitmap
- broadcast it ( |= ) into any active clients (migration or framebuffer)
- everyone's happy
The code dirty thing might need special treatment, we can have a special
tcg-only bitmap for it.
--
error compiling committee.c: too many arguments to function
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