On Thu, Jul 13, 2023 at 10:47:23AM -0400, Michael S. Tsirkin wrote:
> There are a gazillion virtio drivers and most of them just use the
> virtio API, without bothering with these micro-optimizations. virtio
> already tracks addresses so mapping/unmapping them for DMA is easier
> done in the core.
On Thu, Jul 13, 2023 at 04:14:45AM -0700, Christoph Hellwig wrote:
> On Mon, Jul 10, 2023 at 11:42:30AM +0800, Xuan Zhuo wrote:
> > This helper allows the driver change the dma mode to premapped mode.
> > Under the premapped mode, the virtio core do not do dma mapping
> > internally.
> >
> > This
On Thu, Jul 13, 2023 at 04:14:45AM -0700, Christoph Hellwig wrote:
> On Mon, Jul 10, 2023 at 11:42:30AM +0800, Xuan Zhuo wrote:
> > This helper allows the driver change the dma mode to premapped mode.
> > Under the premapped mode, the virtio core do not do dma mapping
> > internally.
> >
> > This
On Mon, Jul 10, 2023 at 11:42:30AM +0800, Xuan Zhuo wrote:
> This helper allows the driver change the dma mode to premapped mode.
> Under the premapped mode, the virtio core do not do dma mapping
> internally.
>
> This just work when the use_dma_api is true. If the use_dma_api is false,
> the dma
On Wed, 12 Jul 2023 16:24:18 +0800, Jason Wang wrote:
> On Mon, Jul 10, 2023 at 11:42 AM Xuan Zhuo
> wrote:
>
> > This helper allows the driver change the dma mode to premapped mode.
> > Under the premapped mode, the virtio core do not do dma mapping
> > internally.
> >
> > This just work when th
On Mon, Jul 10, 2023 at 11:42 AM Xuan Zhuo
wrote:
> This helper allows the driver change the dma mode to premapped mode.
> Under the premapped mode, the virtio core do not do dma mapping
> internally.
>
> This just work when the use_dma_api is true. If the use_dma_api is false,
> the dma options
