On Sun, Oct 11, 2015 at 12:19:54PM +0300, Michael S. Tsirkin wrote:
> > But since you must pass the same value to open(), you already know that
> > you're using noiommu.
> >
> > >VFIO_IOMMU_MAP_DMA, VFIO_IOMMU_ENABLE and VFIO_IOMMU_DISABLE
> > >will probably also fail ...
> > >
> >
> > Don't you have to call MAP_DMA to pin the memory?
>
> Well check it out - the patch in question doesn't implement this ioctl.
> In fact it doesn't implement anything except CHECK_EXTENSION.
>
> And this makes sense to me: MAP_DMA
> maps a virtual address to io address, and that doesn't
> work for the dummy iommu.
>
> You can pin memory using many other ways, including
> mlock and hugetlbfs.
>
mlock() does not pin memory.
--
Gleb.
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
