From 41108170d98069b34837c4512f93ef2ce651b812 Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Mon, 18 Mar 2019 10:34:48 +0000 Subject: KVM: arm/arm64: vgic-irqfd: Implement kvm_arch_set_irq_inatomic Now that we have a cache of MSI->LPI translations, it is pretty easy to implement kvm_arch_set_irq_inatomic (this cache can be parsed without sleeping). Hopefully, this will improve some LPI-heavy workloads. Tested-by: Andre Przywara Reviewed-by: Eric Auger Signed-off-by: Marc Zyngier --- virt/kvm/arm/vgic/vgic-irqfd.c | 36 ++++++++++++++++++++++++++++++------ 1 file changed, 30 insertions(+), 6 deletions(-) (limited to 'virt/kvm/arm/vgic') diff --git a/virt/kvm/arm/vgic/vgic-irqfd.c b/virt/kvm/arm/vgic/vgic-irqfd.c index c9304b88e720..d8cdfea5cc96 100644 --- a/virt/kvm/arm/vgic/vgic-irqfd.c +++ b/virt/kvm/arm/vgic/vgic-irqfd.c @@ -66,6 +66,15 @@ out: return r; } +static void kvm_populate_msi(struct kvm_kernel_irq_routing_entry *e, + struct kvm_msi *msi) +{ + msi->address_lo = e->msi.address_lo; + msi->address_hi = e->msi.address_hi; + msi->data = e->msi.data; + msi->flags = e->msi.flags; + msi->devid = e->msi.devid; +} /** * kvm_set_msi: inject the MSI corresponding to the * MSI routing entry @@ -79,21 +88,36 @@ int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, { struct kvm_msi msi; - msi.address_lo = e->msi.address_lo; - msi.address_hi = e->msi.address_hi; - msi.data = e->msi.data; - msi.flags = e->msi.flags; - msi.devid = e->msi.devid; - if (!vgic_has_its(kvm)) return -ENODEV; if (!level) return -1; + kvm_populate_msi(e, &msi); return vgic_its_inject_msi(kvm, &msi); } +/** + * kvm_arch_set_irq_inatomic: fast-path for irqfd injection + * + * Currently only direct MSI injection is supported. + */ +int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e, + struct kvm *kvm, int irq_source_id, int level, + bool line_status) +{ + if (e->type == KVM_IRQ_ROUTING_MSI && vgic_has_its(kvm) && level) { + struct kvm_msi msi; + + kvm_populate_msi(e, &msi); + if (!vgic_its_inject_cached_translation(kvm, &msi)) + return 0; + } + + return -EWOULDBLOCK; +} + int kvm_vgic_setup_default_irq_routing(struct kvm *kvm) { struct kvm_irq_routing_entry *entries; -- cgit v1.2.3