KVM: arm64: Allow pKVM on v1.0 compatible FF-A implementations

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pKVM initialization fails on systems with v1.1+ FF-A implementations, as
the hyp does a strict match on the returned version from FFA_VERSION.
This is a stronger assertion than required by the specification, which
requires minor revisions be backwards compatible with earlier revisions
of the same major version.

Relax the check in hyp_ffa_init() to only test the returned major
version. Even though v1.1 broke ABI, the expectation is that firmware
incapable of using the v1.0 ABI return NOT_SUPPORTED instead of a valid
version.

Acked-by: Marc Zyngier <maz@kernel.org>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20230718184537.3220867-1-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

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This commit is contained in:

Oliver Upton 2023-07-18 18:45:37 +00:00

parent 9d2a55b403

commit 84f6867903

1 changed files with 14 additions and 1 deletions

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

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