Re: [Qemu-devel] [PATCH 2 of 5] add can_dma/post_dma for direct IO

[Blue Swirl]

On 12/12/08, Andrea Arcangeli <address@hidden> wrote:
> From: Andrea Arcangeli <address@hidden>
>
>  Add can_dma and post_dma methods needed before/after direct IO to guest
>  physical memory.
>
>  Signed-off-by: Andrea Arcangeli <address@hidden>

>  +        /* 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.