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docs: add Arm FF-A mediator
Describes a FF-A version 1.1 [1] mediator to communicate with a Secure Partition in secure world. [1] https://developer.arm.com/documentation/den0077/latest Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org> Reviewed-by: Henry Wang <Henry.Wang@arm.com> Reviewed-by: Bertrand Marquis <bertrand.marquis@arm.com> Reviewed-by: Anthony PERARD <anthony.perard@citrix.com>
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@@ -24,6 +24,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
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- xl/libxl can customize SMBIOS strings for HVM guests.
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- Add support for AVX512-FP16 on x86.
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- On Arm, Xen supports guests running SVE/SVE2 instructions. (Tech Preview)
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- On Arm, add suport for Firmware Framework for Arm A-profile (FF-A) Mediator
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(Tech Preview)
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### Removed
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- On x86, the "pku" command line option has been removed. It has never
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@@ -842,6 +842,15 @@ that covers the DMA of the device to be passed through.
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No support for QEMU backends in a 16K or 64K domain.
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### ARM: Firmware Framework for Arm A-profile (FF-A) Mediator
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Status, Arm64: Tech Preview
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There are still some code paths where a vCPU may hog a pCPU longer than
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necessary. The FF-A mediator is not yet implemented for Arm32. Part of the
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FF-A specification is not supported, see the top comment in
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xen/arch/arm/tee/ffa.c for limitations.
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### ARM: Guest Device Tree support
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Status: Supported
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@@ -1656,6 +1656,21 @@ in OP-TEE.
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This feature is a B<technology preview>.
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=item B<ffa>
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B<Arm only.> Allow a guest to communicate via FF-A with Secure Partitions
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(SP), default false.
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Currently only a small subset of the FF-A specification is supported. Just
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enough to communicate with OP-TEE. In general only direct messaging and
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sharing memory with one SP. More advanced use cases where memory might be
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shared or donated to multiple SPs are not supported.
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See L<https://developer.arm.com/documentation/den0077/latest> for more
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information about FF-A.
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This feature is a B<technology preview>.
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=back
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=back
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