On Thu, Oct 6, 2022 at 7:46 PM Stefan Hajnoczi wrote:
> > Regardless, I'd say we want to map memory regions even if we don't
> > strictly need to (in cases where we can do so at no additional cost),
> > since that may improve performance for some drivers.
>
> The downside is that when
On Thu, Oct 06, 2022 at 07:09:36PM +0100, Alberto Faria wrote:
> On Thu, Oct 6, 2022 at 7:00 PM Stefan Hajnoczi wrote:
> > s->needs_mem_regions determines if we'll use libblkio memory regions at
> > all. When it's false we skip blkio_map_mem_region() and therefore it's
> > safe to set
On Thu, Oct 6, 2022 at 7:00 PM Stefan Hajnoczi wrote:
> s->needs_mem_regions determines if we'll use libblkio memory regions at
> all. When it's false we skip blkio_map_mem_region() and therefore it's
> safe to set s->mem_regions_pinned to false.
blkio_register_buf() calls
On Wed, Sep 28, 2022 at 09:12:36PM +0100, Alberto Campinho Faria wrote:
> On Wed, Sep 28, 2022 at 8:21 PM Stefan Hajnoczi wrote:
> > On Tue, Sep 27, 2022 at 03:34:30PM -0400, Stefan Hajnoczi wrote:
> > > +ret = blkio_get_bool(s->blkio,
> > > + "mem-regions-pinned",
> >
On Wed, Sep 28, 2022 at 8:21 PM Stefan Hajnoczi wrote:
> On Tue, Sep 27, 2022 at 03:34:30PM -0400, Stefan Hajnoczi wrote:
> > +ret = blkio_get_bool(s->blkio,
> > + "mem-regions-pinned",
> > + >mem_regions_pinned);
> > +if (ret < 0) {
> > +
On Tue, Sep 27, 2022 at 03:34:30PM -0400, Stefan Hajnoczi wrote:
> +ret = blkio_get_bool(s->blkio,
> + "mem-regions-pinned",
> + >mem_regions_pinned);
> +if (ret < 0) {
> +/* Be conservative (assume pinning) if the property is not
Avoid bounce buffers when QEMUIOVector elements are within previously
registered bdrv_register_buf() buffers.
The idea is that emulated storage controllers will register guest RAM
using bdrv_register_buf() and set the BDRV_REQ_REGISTERED_BUF on I/O
requests. Therefore no blkio_map_mem_region()
