lkml.org 
[lkml]   [2019]   [Dec]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v3 27/32] KVM: arm64: GICv4.1: Let doorbells be auto-enabled
Date
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>
---
virt/kvm/arm/vgic/vgic-v4.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)

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) {
--
2.20.1
\
 
 \ /
  Last update: 2019-12-24 12:40    [W:0.177 / U:1.076 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site