Re: [patch] kvm: make cr3 loading more robust

Avi Kivity
2007-01-03T13:34:43Z

Ingo Molnar wrote:
> * Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org> wrote:
>
>
>> Yes.
>>
>> A read-only memory slot may have other uses too (for ROMs).
>>
>
> a related question: i was wondering about the purpose of the
> KVM_MEM_LOG_DIRTY_PAGES feature that is attached to physical memory
> slots. Is that used so that you can get a compact bitmap of all modified
> pages within a Qemu-emulated framebuffer, resulting in a delta update,
> instead of having to do the full framebuffer update every time?
>

Yes. A future use is the live migration thing (although we need to
update the mmu to mark guest page tables when it sets the dirty and
accessed bits for that, or when it emulates an instruction).