Blue Swirl wrote:
On 12/12/08, Andrea Arcangeli <[email protected]> wrote:
From: Andrea Arcangeli <[email protected]>
Add can_dma and post_dma methods needed before/after direct IO to guest
physical memory.
Signed-off-by: Andrea Arcangeli <[email protected]>
+ /* nonlinear range */
+ if (pd_first != pd)
+ return NULL;
In my tests on Sparc32, IOMMU can map a linear DVMA range to several
non-linear physical pages, so this case should be handled correctly.
I think we should go back to Fabrice's earliest suggestion here. We
should just have a simple map/unmap lock/unlock API for physical
memory. That should be the base API IMHO.
As long the map function goes from guest physical => host virtual, it
can work for everything we care about.
This is orthogonal to an API dealing with scatter/gather lists and
translation to and from them.
Regards,
Anthony Liguori
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