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[15/15] KVM: arm64: vgic-its: Rely on RCU to protect translation cache reads

Message ID 20240124204909.105952-16-oliver.upton@linux.dev (mailing list archive)
State New, archived
Headers show
Series KVM: arm64: Improvements to GICv3 LPI injection | expand

Commit Message

Oliver Upton Jan. 24, 2024, 8:49 p.m. UTC 
Stop taking the lpi_list_lock when reading the LPI translation cache.

Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
---
 arch/arm64/kvm/vgic/vgic-its.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)
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Patch

diff --git a/arch/arm64/kvm/vgic/vgic-its.c b/arch/arm64/kvm/vgic/vgic-its.c
index 1670b452c682..46ff21fea785 100644
--- a/arch/arm64/kvm/vgic/vgic-its.c
+++ b/arch/arm64/kvm/vgic/vgic-its.c
@@ -590,15 +590,14 @@  static struct vgic_irq *vgic_its_check_cache(struct kvm *kvm, phys_addr_t db,
 {
 	struct vgic_dist *dist = &kvm->arch.vgic;
 	struct vgic_irq *irq;
-	unsigned long flags;
 
-	raw_spin_lock_irqsave(&dist->lpi_list_lock, flags);
+	rcu_read_lock();
 
 	irq = __vgic_its_check_cache(dist, db, devid, eventid);
 	if (irq && !vgic_try_get_irq_kref(irq))
 		irq = NULL;
 
-	raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags);
+	rcu_read_unlock();
 
 	return irq;
 }