arm64: kvm: Add standalone ticket spinlock implementation for use at hyp

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We will soon need to synchronise multiple CPUs in the hyp text at EL2.
The qspinlock-based locking used by the host is overkill for this purpose
and relies on the kernel's "percpu" implementation for the MCS nodes.

Implement a simple ticket locking scheme based heavily on the code removed
by commit c11090474d ("arm64: locking: Replace ticket lock implementation
with qspinlock").

Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Quentin Perret <qperret@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210319100146.1149909-4-qperret@google.com

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Will Deacon 2021-03-19 10:01:11 +00:00 • committed by Marc Zyngier

parent 7b4a7b5e6f

commit 67c2d32633

1 changed files with 92 additions and 0 deletions

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arch/arm64/kvm/hyp/include/nvhe/spinlock.h

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