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authorMarc Zyngier <maz@kernel.org>2020-03-04 20:33:24 +0000
committerMarc Zyngier <maz@kernel.org>2020-03-24 12:15:51 +0000
commit9879b79aefe5ca3cfee0138189c8116f3a71e770 (patch)
tree95d4a8eb92d9d609892ef8a3ebe102f1fe181dee /virt
parent009384b38034111bf2c0c7bfb2740f5bd45c176c (diff)
downloadlinux-9879b79aefe5ca3cfee0138189c8116f3a71e770.tar.gz
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
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/arm/vgic/vgic-v4.c9
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) {