Re: [PATCH 1/1] x86/tboot: Don't disable swiotlb when iommu is forced on

2020-11-25 Thread Konrad Rzeszutek Wilk
On Wed, Nov 25, 2020 at 03:51:30PM +, 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 +, Will Deacon wrote: > > > On Wed, 25 Nov 2020 09:41:24 +0800, Lu Baolu wrote: > > > > After commit 327d5

Re: [PATCH 1/1] x86/tboot: Don't disable swiotlb when iommu is forced on

2020-11-25 Thread Will Deacon
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 +, 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"), sw

Re: [PATCH 1/1] x86/tboot: Don't disable swiotlb when iommu is forced on

2020-11-25 Thread Konrad Rzeszutek Wilk
On Wed, Nov 25, 2020 at 02:05:15PM +, 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 c

Re: [PATCH 1/1] x86/tboot: Don't disable swiotlb when iommu is forced on

2020-11-25 Thread Will Deacon
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 IO

[PATCH 1/1] x86/tboot: Don't disable swiotlb when iommu is forced on

2020-11-24 Thread Lu Baolu
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 "iom