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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>
This commit is contained in:
Marc Zyngier 2019-06-10 10:26:37 +01:00
parent 1bb3691d83
commit 7d825fd6ea
2 changed files with 24 additions and 0 deletions
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23
virt/kvm/arm/vgic/vgic-its.c
View File

@ -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)
{

1
virt/kvm/arm/vgic/vgic.h
View File

@ -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);