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KVM: arm64: Add hyp_spin_is_locked() for basic locking assertions at EL2

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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
This commit is contained in:
Will Deacon 2021-08-09 16:24:28 +01:00 committed by Marc Zyngier
parent 63db506e07
commit d21292f13f
1 changed files with 8 additions and 0 deletions
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8
arch/arm64/kvm/hyp/include/nvhe/spinlock.h
View file

@ -15,6 +15,7 @@
#include <asm/alternative.h>
#include <asm/lse.h>
#include <asm/rwonce.h>
typedef union hyp_spinlock {
u32 __val;
@ -89,4 +90,11 @@ static inline void hyp_spin_unlock(hyp_spinlock_t *lock)
: "memory");
}
static inline bool hyp_spin_is_locked(hyp_spinlock_t *lock)
{
hyp_spinlock_t lockval = READ_ONCE(*lock);
return lockval.owner != lockval.next;
}
#endif /* __ARM64_KVM_NVHE_SPINLOCK_H__ */