Re: [Qemu-devel] [PATCH] kvm: First step to push iothread lock out of inner run loop

[Jan Kiszka <jan.kiszka@web.de>]

[-- Attachment #1: Type: text/plain, Size: 862 bytes --]

On 2012-06-24 16:35, Avi Kivity wrote:
> On 06/24/2012 05:08 PM, Jan Kiszka wrote:
>> As a first step, I will post a series later that gets rid of
>> kvm_flush_coalesced_mmio_buffer in the common vmexit path.
> 
> If you defer this, I can think of two places that need to flush:
> - anything that accesses those memory areas (such as DMA to the
> framebuffer, or updating the display)

- anything that accesses related areas (in case of VGA: PIO accesses to
the control ports). I'm providing memory_region_set_flush_coalesced that
allows to flush on non-coalesced region accesses as well. Some PIO
accesses unfortunately still need open-coded
qemu_flush_coalesced_mmio_buffer as they do not use memory regions yet.

> - anything that modifies the memory map and possibly changes flushed
> addresses

Good point, need to address this.

Jan


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 262 bytes --]