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1c80002e |
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10-Nov-2022 |
Fuad Tabba <tabba@google.com> |
KVM: arm64: Add hyp_spinlock_t static initializer Introduce a static initializer macro for 'hyp_spinlock_t' so that it is straightforward to instantiate global locks at EL2. This will be later utilised for locking the VM table in the hypervisor. Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Tested-by: Vincent Donnefort <vdonnefort@google.com> Signed-off-by: Fuad Tabba <tabba@google.com> Signed-off-by: Will Deacon <will@kernel.org> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20221110190259.26861-11-will@kernel.org
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8e049e0d |
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09-Aug-2021 |
Quentin Perret <qperret@google.com> |
KVM: arm64: Introduce hyp_assert_lock_held() Introduce a poor man's lockdep implementation at EL2 which allows to BUG() whenever a hyp spinlock is not held when it should. Hide this feature behind a new Kconfig option that targets the EL2 object specifically, instead of piggy backing on the existing CONFIG_LOCKDEP. EL2 cannot WARN() cleanly to report locking issues, hence BUG() is the only option and it is not clear whether we want this widely enabled. This is most likely going to be useful for local testing until the EL2 WARN() situation has improved. Signed-off-by: Quentin Perret <qperret@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20210809152448.1810400-3-qperret@google.com
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d21292f1 |
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09-Aug-2021 |
Will Deacon <will@kernel.org> |
KVM: arm64: Add hyp_spin_is_locked() for basic locking assertions at EL2 Introduce hyp_spin_is_locked() so that functions can easily assert that a given lock is held (albeit possibly by another CPU!) without having to drag full lockdep support up to EL2. 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/20210809152448.1810400-2-qperret@google.com
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67c2d326 |
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19-Mar-2021 |
Will Deacon <will@kernel.org> |
arm64: kvm: Add standalone ticket spinlock implementation for use at hyp 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 c11090474d70 ("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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