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Lu Baolu e2be2a833a x86/tboot: Don't disable swiotlb when iommu is forced on 
After commit 327d5b2fee ("iommu/vt-d: Allow 32bit devices to uses DMA
domain"), swiotlb 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.

Fixes: 327d5b2fee ("iommu/vt-d: Allow 32bit devices to uses DMA domain")
Reported-and-tested-by: Adrian Huang <ahuang12@lenovo.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20201125014124.4070776-1-baolu.lu@linux.intel.com
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=210237
Signed-off-by: Will Deacon <will@kernel.org>
2020-11-25 12:07:32 +00:00
arch x86/tboot: Don't disable swiotlb when iommu is forced on 2020-11-25 12:07:32 +00:00
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drivers iommu: Check return of __iommu_attach_device() 2020-11-23 14:57:41 +00:00
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include iommu/vt-d: Avoid panic if iommu init fails in tboot system 2020-11-18 13:09:07 +00:00
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MAINTAINERS MAINTAINERS: Temporarily add myself to the IOMMU entry 2020-11-19 11:12:17 +00:00
Makefile
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.