Re: [Qemu-devel] [PATCH 03/29] display: enable DIRTY_MEMORY_VGA tracking explicitly

[Paolo Bonzini]

On 26/05/2015 14:08, Peter Maydell wrote:
>>> >> Could you provide some explanation/documentation of when a
>>> >> display device needs to set DIRTY_MEMORY_VGA (and when it
>>> >> doesn't)?
>> >
>> > It needs to set it if it uses memory_region_get/set/clear_dirty with
>> > DIRTY_MEMORY_VGA as the last argument.
> OK, and which devices need to do that?

Those that care to optimize their update_display callback.  It's
entirely opt in.

Paolo