[PATCH v3 01/21] KVM: arm64: Add hyp_spin_is_locked() for basic locking assertions at EL2

Quentin Perret
2021-07-29T13:28:28Z

From: Will Deacon <will@kernel.org>

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>
---
arch/arm64/kvm/hyp/include/nvhe/spinlock.h | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/arch/arm64/kvm/hyp/include/nvhe/spinlock.h b/arch/arm64/kvm/hyp/include/nvhe/spinlock.h
index 76b537f8d1c6..04f65b655fcf 100644
--- a/arch/arm64/kvm/hyp/include/nvhe/spinlock.h
+++ b/arch/arm64/kvm/hyp/include/nvhe/spinlock.h
@@ -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__ */
--
2.32.0.432.gabb21c7263-goog