[PATCH 04/15] KVM: arm64: vgic-its: Walk the LPI xarray in vgic_copy_lpi_list()

Oliver Upton
2024-01-24T20:49:30Z

Start iterating the LPI xarray in anticipation of removing the LPI
linked-list.

Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
---
arch/arm64/kvm/vgic/vgic-its.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/vgic/vgic-its.c b/arch/arm64/kvm/vgic/vgic-its.c
index f152d670113f..a2d95a279798 100644
--- a/arch/arm64/kvm/vgic/vgic-its.c
+++ b/arch/arm64/kvm/vgic/vgic-its.c
@@ -332,6 +332,7 @@ static int update_lpi_config(struct kvm *kvm, struct vgic_irq *irq,
int vgic_copy_lpi_list(struct kvm *kvm, struct kvm_vcpu *vcpu, u32 **intid_ptr)
{
struct vgic_dist *dist = &kvm->arch.vgic;
+ XA_STATE(xas, &dist->lpi_xa, 0);
struct vgic_irq *irq;
unsigned long flags;
u32 *intids;
@@ -350,7 +351,9 @@ int vgic_copy_lpi_list(struct kvm *kvm, struct kvm_vcpu *vcpu, u32 **intid_ptr)
return -ENOMEM;

raw_spin_lock_irqsave(&dist->lpi_list_lock, flags);
- list_for_each_entry(irq, &dist->lpi_list_head, lpi_list) {
+ rcu_read_lock();
+
+ xas_for_each(&xas, irq, U32_MAX) {
if (i == irq_count)
break;
/* We don't need to "get" the IRQ, as we hold the list lock. */
@@ -358,6 +361,8 @@ int vgic_copy_lpi_list(struct kvm *kvm, struct kvm_vcpu *vcpu, u32 **intid_ptr)
continue;
intids[i++] = irq->intid;
}
+
+ rcu_read_unlock();
raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags);

*intid_ptr = intids;
--
2.43.0.429.g432eaa2c6b-goog