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| author | Marc Zyngier <maz@kernel.org> | 2020-03-04 20:33:24 +0000 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2020-03-24 12:15:51 +0000 |
| commit | 9879b79aefe5ca3cfee0138189c8116f3a71e770 (patch) | |
| tree | 95d4a8eb92d9d609892ef8a3ebe102f1fe181dee | |
| parent | 009384b38034111bf2c0c7bfb2740f5bd45c176c (diff) | |
| download | lwn-9879b79aefe5ca3cfee0138189c8116f3a71e770.tar.gz lwn-9879b79aefe5ca3cfee0138189c8116f3a71e770.zip | |
KVM: arm64: GICv4.1: Let doorbells be auto-enabled
As GICv4.1 understands the life cycle of doorbells (instead of
just randomly firing them at the most inconvenient time), just
enable them at irq_request time, and be done with it.
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Link: https://lore.kernel.org/r/20200304203330.4967-18-maz@kernel.org
| -rw-r--r-- | virt/kvm/arm/vgic/vgic-v4.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/virt/kvm/arm/vgic/vgic-v4.c b/virt/kvm/arm/vgic/vgic-v4.c index 1eb0f8c76219..c2fcde104ea2 100644 --- a/virt/kvm/arm/vgic/vgic-v4.c +++ b/virt/kvm/arm/vgic/vgic-v4.c @@ -141,6 +141,7 @@ int vgic_v4_init(struct kvm *kvm) kvm_for_each_vcpu(i, vcpu, kvm) { int irq = dist->its_vm.vpes[i]->irq; + unsigned long irq_flags = DB_IRQ_FLAGS; /* * Don't automatically enable the doorbell, as we're @@ -148,8 +149,14 @@ int vgic_v4_init(struct kvm *kvm) * blocked. Also disable the lazy disabling, as the * doorbell could kick us out of the guest too * early... + * + * On GICv4.1, the doorbell is managed in HW and must + * be left enabled. */ - irq_set_status_flags(irq, DB_IRQ_FLAGS); + if (kvm_vgic_global_state.has_gicv4_1) + irq_flags &= ~IRQ_NOAUTOEN; + irq_set_status_flags(irq, irq_flags); + ret = request_irq(irq, vgic_v4_doorbell_handler, 0, "vcpu", vcpu); if (ret) { |