Re: [PATCH 3/3] iommu/virtio: Enable x86 support

Jean-Philippe Brucker
2021-04-15T15:14:41Z

On Thu, Mar 18, 2021 at 11:43:38AM +0000, Robin Murphy wrote:
> On 2021-03-16 19:16, Jean-Philippe Brucker wrote:
> > With the VIOT support in place, x86 platforms can now use the
> > virtio-iommu.
> >
> > The arm64 Kconfig selects IOMMU_DMA, while x86 IOMMU drivers select it
> > themselves.
>
> Actually, now that both AMD and Intel are converted over, maybe it's finally
> time to punt that to x86 arch code to match arm64?

x86 also has CONFIG_HYPERV_IOMMU that doesn't use IOMMU_DMA, and might not
want to pull in dma-iommu.o + iova.o (don't know if they care about guest
size). There also is the old gart driver, but that doesn't select
IOMMU_SUPPORT.

Thanks,
Jean