9111aebf77
ARMv8.1 extensions added Virtualization Host Extensions (VHE), which allow to run a host kernel at EL2. When using normal DMA, Device and CPU address spaces are dissociated, and do not need to implement the same capabilities, so VHE hasn't been used in the SMMU until now. With shared address spaces however, ASIDs are shared between MMU and SMMU, and broadcast TLB invalidations issued by a CPU are taken into account by the SMMU. TLB entries on both sides need to have identical exception level in order to be cleared with a single invalidation. When the CPU is using VHE, enable VHE in the SMMU for all STEs. Normal DMA mappings will need to use TLBI_EL2 commands instead of TLBI_NH, but shouldn't be otherwise affected by this change. Acked-by: Will Deacon <will@kernel.org> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org> Link: https://lore.kernel.org/r/20210122151054.2833521-4-jean-philippe@linaro.org Signed-off-by: Will Deacon <will@kernel.org> |
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| 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.