On Wed, Nov 25, 2020 at 03:51:30PM +0000, Will Deacon wrote: > Hi Konrad, > > On Wed, Nov 25, 2020 at 10:41:53AM -0500, Konrad Rzeszutek Wilk wrote: > > On Wed, Nov 25, 2020 at 02:05:15PM +0000, Will Deacon wrote: > > > On Wed, 25 Nov 2020 09:41:24 +0800, Lu Baolu wrote: > > > > After commit 327d5b2fee91c ("iommu/vt-d: Allow 32bit devices to uses DMA > > > > domain"), swiotbl could also be used for direct memory access if IOMMU > > > > is enabled but a device is configured to pass through the DMA > > > > translation. > > > > Keep swiotlb when IOMMU is forced on, otherwise, some devices won't work > > > > if "iommu=pt" kernel parameter is used. > > > > > > Applied to arm64 (for-next/iommu/fixes), thanks! > > > > > > [1/1] x86/tboot: Don't disable swiotlb when iommu is forced on > > > https://git.kernel.org/arm64/c/e2be2a833ab5 > > > > But tboot never ran on ARM. It is a Intel specifc. > > > > I think either me or Thomas should take this patch. > > FWIW, I did check with Thomas before I picked it up. I know it looks weird > going via arm64, but that's only because I'm temporarily handling the IOMMU > tree there (including vt-d changes) while Joerg is away. Since this fixes a > vt-d regression, I thought I'd pick it up along with the other IOMMU fixes I > have queued for -rc6. >
Aah, I missed the memo :-) > That said, if you insist, then I can revert it. I'm really only trying to > help here. Nah. Enjoy picking up patches! Thanks! > > Will