KVM: arm64: pkvm: Add support for fragmented FF-A descriptors

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FF-A memory descriptors may need to be sent in fragments when they don't
fit in the mailboxes. Doing so involves using the FRAG_TX and FRAG_RX
primitives defined in the FF-A protocol.

Add support in the pKVM FF-A relayer for fragmented descriptors by
monitoring outgoing FRAG_TX transactions and by buffering large
descriptors on the reclaim path.

Co-developed-by: Andrew Walbran <qwandor@google.com>
Signed-off-by: Andrew Walbran <qwandor@google.com>
Signed-off-by: Quentin Perret <qperret@google.com>
Signed-off-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20230523101828.7328-11-will@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

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Quentin Perret 2023-05-23 11:18:27 +01:00 • committed by Oliver Upton

parent 20936cd114

commit 0a9f15fd56

2 changed files with 162 additions and 25 deletions

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17

arch/arm64/include/asm/kvm_pkvm.h

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170

arch/arm64/kvm/hyp/nvhe/ffa.c

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