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KVM: arm64: vgic: Get rid of the LPI linked-list

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All readers of LPI configuration have been transitioned to use the LPI
xarray. Get rid of the linked-list altogether.

Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240221054253.3848076-6-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Oliver Upton 2024-02-21 05:42:48 +00:00
parent 2798683b8c
commit 9880835af7
4 changed files with 2 additions and 10 deletions
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1
arch/arm64/kvm/vgic/vgic-init.c
View File

@ -53,7 +53,6 @@ void kvm_vgic_early_init(struct kvm *kvm)
{
struct vgic_dist *dist = &kvm->arch.vgic;
INIT_LIST_HEAD(&dist->lpi_list_head);
INIT_LIST_HEAD(&dist->lpi_translation_cache);
raw_spin_lock_init(&dist->lpi_list_lock);
xa_init_flags(&dist->lpi_xa, XA_FLAGS_LOCK_IRQ);

8
arch/arm64/kvm/vgic/vgic-its.c
View File

@ -58,7 +58,6 @@ static struct vgic_irq *vgic_add_lpi(struct kvm *kvm, u32 intid,
return ERR_PTR(ret);
}
INIT_LIST_HEAD(&irq->lpi_list);
INIT_LIST_HEAD(&irq->ap_list);
raw_spin_lock_init(&irq->irq_lock);
@ -74,10 +73,8 @@ static struct vgic_irq *vgic_add_lpi(struct kvm *kvm, u32 intid,
* There could be a race with another vgic_add_lpi(), so we need to
* check that we don't add a second list entry with the same LPI.
*/
list_for_each_entry(oldirq, &dist->lpi_list_head, lpi_list) {
if (oldirq->intid != intid)
continue;
oldirq = xa_load(&dist->lpi_xa, intid);
if (oldirq) {
/* Someone was faster with adding this LPI, lets use that. */
kfree(irq);
irq = oldirq;
@ -99,7 +96,6 @@ static struct vgic_irq *vgic_add_lpi(struct kvm *kvm, u32 intid,
goto out_unlock;
}
list_add_tail(&irq->lpi_list, &dist->lpi_list_head);
dist->lpi_list_count++;
out_unlock:

1
arch/arm64/kvm/vgic/vgic.c
View File

@ -122,7 +122,6 @@ void __vgic_put_lpi_locked(struct kvm *kvm, struct vgic_irq *irq)
if (!kref_put(&irq->refcount, vgic_irq_release))
return;
list_del(&irq->lpi_list);
xa_erase(&dist->lpi_xa, irq->intid);
dist->lpi_list_count--;

2
include/kvm/arm_vgic.h
View File

@ -117,7 +117,6 @@ struct irq_ops {
struct vgic_irq {
raw_spinlock_t irq_lock; /* Protects the content of the struct */
struct list_head lpi_list; /* Used to link all LPIs together */
struct list_head ap_list;
struct kvm_vcpu *vcpu; /* SGIs and PPIs: The VCPU
@ -277,7 +276,6 @@ struct vgic_dist {
/* Protects the lpi_list and the count value below. */
raw_spinlock_t lpi_list_lock;
struct xarray lpi_xa;
struct list_head lpi_list_head;
int lpi_list_count;
/* LPI translation cache */