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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
This commit is contained in:
Marc Zyngier 2020-03-04 20:33:24 +00:00
parent 009384b380
commit 9879b79aef
1 changed files with 8 additions and 1 deletions
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9
virt/kvm/arm/vgic/vgic-v4.c
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@ -141,6 +141,7 @@ int vgic_v4_init(struct kvm *kvm)
kvm_for_each_vcpu(i, vcpu, kvm) { kvm_for_each_vcpu(i, vcpu, kvm) {
int irq = dist->its_vm.vpes[i]->irq; int irq = dist->its_vm.vpes[i]->irq;
unsigned long irq_flags = DB_IRQ_FLAGS;
/* /*
* Don't automatically enable the doorbell, as we're * 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 * blocked. Also disable the lazy disabling, as the
* doorbell could kick us out of the guest too * doorbell could kick us out of the guest too
* early... * 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, ret = request_irq(irq, vgic_v4_doorbell_handler,
0, "vcpu", vcpu); 0, "vcpu", vcpu);
if (ret) { if (ret) {