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KVM: arm/arm64: vgic-its: Check the LPI translation cache on MSI injection

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When performing an MSI injection, let's first check if the translation
is already in the cache. If so, let's inject it quickly without
going through the whole translation process.

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 2019-03-18 10:29:30 +00:00
parent 89489ee9ce
commit 86a7dae884
2 changed files with 37 additions and 0 deletions
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36
virt/kvm/arm/vgic/vgic-its.c
View File

@ -566,6 +566,20 @@ static struct vgic_irq *__vgic_its_check_cache(struct vgic_dist *dist,
return NULL;
}
static struct vgic_irq *vgic_its_check_cache(struct kvm *kvm, phys_addr_t db,
u32 devid, u32 eventid)
{
struct vgic_dist *dist = &kvm->arch.vgic;
struct vgic_irq *irq;
unsigned long flags;
raw_spin_lock_irqsave(&dist->lpi_list_lock, flags);
irq = __vgic_its_check_cache(dist, db, devid, eventid);
raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags);
return irq;
}
static void vgic_its_cache_translation(struct kvm *kvm, struct vgic_its *its,
u32 devid, u32 eventid,
struct vgic_irq *irq)
@ -725,6 +739,25 @@ static int vgic_its_trigger_msi(struct kvm *kvm, struct vgic_its *its,
return 0;
}
int vgic_its_inject_cached_translation(struct kvm *kvm, struct kvm_msi *msi)
{
struct vgic_irq *irq;
unsigned long flags;
phys_addr_t db;
db = (u64)msi->address_hi << 32 | msi->address_lo;
irq = vgic_its_check_cache(kvm, db, msi->devid, msi->data);
if (!irq)
return -1;
raw_spin_lock_irqsave(&irq->irq_lock, flags);
irq->pending_latch = true;
vgic_queue_irq_unlock(kvm, irq, flags);
return 0;
}
/*
* Queries the KVM IO bus framework to get the ITS pointer from the given
* doorbell address.
@ -736,6 +769,9 @@ int vgic_its_inject_msi(struct kvm *kvm, struct kvm_msi *msi)
struct vgic_its *its;
int ret;
if (!vgic_its_inject_cached_translation(kvm, msi))
return 1;
its = vgic_msi_to_its(kvm, msi);
if (IS_ERR(its))
return PTR_ERR(its);

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

@ -308,6 +308,7 @@ int vgic_copy_lpi_list(struct kvm *kvm, struct kvm_vcpu *vcpu, u32 **intid_ptr);
int vgic_its_resolve_lpi(struct kvm *kvm, struct vgic_its *its,
u32 devid, u32 eventid, struct vgic_irq **irq);
struct vgic_its *vgic_msi_to_its(struct kvm *kvm, struct kvm_msi *msi);
int vgic_its_inject_cached_translation(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);