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KVM: arm64: vgic: Free LPI vgic_irq structs in an RCU-safe manner

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Free the vgic_irq structs in an RCU-safe manner to allow reads of the
LPI configuration data to happen in parallel with the release of LPIs.

Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240221054253.3848076-8-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Oliver Upton 2024-02-21 05:42:50 +00:00
parent 05f4d4f5d4
commit a5c7f011cb
2 changed files with 2 additions and 1 deletions
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2
arch/arm64/kvm/vgic/vgic.c
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@ -125,7 +125,7 @@ void __vgic_put_lpi_locked(struct kvm *kvm, struct vgic_irq *irq)
xa_erase(&dist->lpi_xa, irq->intid);
atomic_dec(&dist->lpi_count);
kfree(irq);
kfree_rcu(irq, rcu);
}
void vgic_put_irq(struct kvm *kvm, struct vgic_irq *irq)

1
include/kvm/arm_vgic.h
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@ -117,6 +117,7 @@ struct irq_ops {
struct vgic_irq {
raw_spinlock_t irq_lock; /* Protects the content of the struct */
struct rcu_head rcu;
struct list_head ap_list;
struct kvm_vcpu *vcpu; /* SGIs and PPIs: The VCPU