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KVM: arm64: vgic: Use xarray to find LPI in vgic_get_lpi()

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Iterating over the LPI linked-list is less than ideal when the desired
index is already known. Use the INTID to index the LPI xarray instead.

Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240221054253.3848076-3-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Oliver Upton
2024-02-21 05:42:45 +00:00
parent 1d6f83f60f
commit 5a021df719
1 changed files with 5 additions and 14 deletions
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19
arch/arm64/kvm/vgic/vgic.c
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@@ -55,8 +55,9 @@ struct vgic_global kvm_vgic_global_state __ro_after_init = {
*/
/*
* Iterate over the VM's list of mapped LPIs to find the one with a
* matching interrupt ID and return a reference to the IRQ structure.
* Index the VM's xarray of mapped LPIs and return a reference to the IRQ
* structure. The caller is expected to call vgic_put_irq() later once it's
* finished with the IRQ.
*/
static struct vgic_irq *vgic_get_lpi(struct kvm *kvm, u32 intid)
{
@@ -66,20 +67,10 @@ static struct vgic_irq *vgic_get_lpi(struct kvm *kvm, u32 intid)
raw_spin_lock_irqsave(&dist->lpi_list_lock, flags);
list_for_each_entry(irq, &dist->lpi_list_head, lpi_list) {
if (irq->intid != intid)
continue;
/*
* This increases the refcount, the caller is expected to
* call vgic_put_irq() later once it's finished with the IRQ.
*/
irq = xa_load(&dist->lpi_xa, intid);
if (irq)
vgic_get_irq_kref(irq);
goto out_unlock;
}
irq = NULL;
out_unlock:
raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags);
return irq;