KVM: arm/arm64: vgic-its: Add MSI-LPI translation cache invalidation

There's a number of cases where we need to invalidate the caching
of translations, so let's add basic support for that.

Tested-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>

diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
index 0e5c151..cc6b5e4 100644 (file)
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -535,6 +535,29 @@ static unsigned long vgic_mmio_read_its_idregs(struct kvm *kvm,
        return 0;
 }
 
+void vgic_its_invalidate_cache(struct kvm *kvm)
+{
+       struct vgic_dist *dist = &kvm->arch.vgic;
+       struct vgic_translation_cache_entry *cte;
+       unsigned long flags;
+
+       raw_spin_lock_irqsave(&dist->lpi_list_lock, flags);
+
+       list_for_each_entry(cte, &dist->lpi_translation_cache, entry) {
+               /*
+                * If we hit a NULL entry, there is nothing after this
+                * point.
+                */
+               if (!cte->irq)
+                       break;
+
+               __vgic_put_lpi_locked(kvm, cte->irq);
+               cte->irq = NULL;
+       }
+
+       raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags);
+}
+
 int vgic_its_resolve_lpi(struct kvm *kvm, struct vgic_its *its,
                         u32 devid, u32 eventid, struct vgic_irq **irq)
 {

diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h
index 8e9413e..c7fb4da 100644 (file)
--- a/virt/kvm/arm/vgic/vgic.h
+++ b/virt/kvm/arm/vgic/vgic.h
@@ -310,6 +310,7 @@ int vgic_its_resolve_lpi(struct kvm *kvm, struct vgic_its *its,
 struct vgic_its *vgic_msi_to_its(struct kvm *kvm, struct kvm_msi *msi);
 void vgic_lpi_translation_cache_init(struct kvm *kvm);
 void vgic_lpi_translation_cache_destroy(struct kvm *kvm);
+void vgic_its_invalidate_cache(struct kvm *kvm);
 
 bool vgic_supports_direct_msis(struct kvm *kvm);
 int vgic_v4_init(struct kvm *kvm);