KVM: arm64: Intercept host's CPU_ON SMCs

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Add a handler of the CPU_ON PSCI call from host. When invoked, it looks
up the logical CPU ID corresponding to the provided MPIDR and populates
the state struct of the target CPU with the provided x0, pc. It then
calls CPU_ON itself, with an entry point in hyp that initializes EL2
state before returning ERET to the provided PC in EL1.

There is a simple atomic lock around the boot args struct. If it is
already locked, CPU_ON will return PENDING_ON error code.

Signed-off-by: David Brazdil <dbrazdil@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20201202184122.26046-22-dbrazdil@google.com

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David Brazdil 2020-12-02 18:41:17 +00:00 • committed by Marc Zyngier

parent 04e05f057a

commit cdf3671927

2 changed files with 163 additions and 0 deletions

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48

arch/arm64/kvm/hyp/nvhe/hyp-init.S

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115

arch/arm64/kvm/hyp/nvhe/psci-relay.c

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