KVM: arm64: Trap FFA_VERSION host call in pKVM

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The pKVM hypervisor initializes with FF-A version 1.0. The spec requires
that no other FF-A calls to be issued before the version negotiation
phase is complete. Split the hypervisor proxy initialization code in two
parts so that we can move the later one after the host negotiates its
version.

Without trapping the call, the host drivers can negotiate a higher
version number with TEE which can result in a different memory layout
described during the memory sharing calls.

Signed-off-by: Sebastian Ene <sebastianene@google.com>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Tested-by: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240613132035.1070360-2-sebastianene@google.com
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

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Sebastian Ene 2024-06-13 13:20:32 +00:00 • committed by Oliver Upton

parent 83a7eefedc

commit c9c012625e

1 changed files with 90 additions and 30 deletions

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

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