| Message ID | 20190725153543.24386-10-maz@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | KVM: arm/arm64: vgic: ITS translation cache | expand |
Hi Marc, On 7/25/19 5:35 PM, Marc Zyngier wrote: > From: Marc Zyngier <marc.zyngier@arm.com> > > 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. > > Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Eric Auger <eric.auger@redhat.com> Thanks Eric > --- > virt/kvm/arm/vgic/vgic-its.c | 36 ++++++++++++++++++++++++++++++++++++ > virt/kvm/arm/vgic/vgic.h | 1 + > 2 files changed, 37 insertions(+) > > diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c > index e61d3ea0ab40..2be6b66b3856 100644 > --- a/virt/kvm/arm/vgic/vgic-its.c > +++ b/virt/kvm/arm/vgic/vgic-its.c > @@ -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); > diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h > index 09908b80fb1e..db308a62b34d 100644 > --- a/virt/kvm/arm/vgic/vgic.h > +++ b/virt/kvm/arm/vgic/vgic.h > @@ -306,6 +306,7 @@ 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); >
diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c index e61d3ea0ab40..2be6b66b3856 100644 --- a/virt/kvm/arm/vgic/vgic-its.c +++ b/virt/kvm/arm/vgic/vgic-its.c @@ -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); diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h index 09908b80fb1e..db308a62b34d 100644 --- a/virt/kvm/arm/vgic/vgic.h +++ b/virt/kvm/arm/vgic/vgic.h @@ -306,6 +306,7 @@ 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);