From d9c3872cd2f86b7295446e35b4801270669d2960 Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Wed, 4 Mar 2020 20:33:28 +0000 Subject: KVM: arm64: GICv4.1: Reload VLPI configuration on distributor enable/disable Each time a Group-enable bit gets flipped, the state of these bits needs to be forwarded to the hardware. This is a pretty heavy handed operation, requiring all vcpus to reload their GICv4 configuration. It is thus implemented as a new request type. These enable bits are programmed into the HW by setting the VGrp{0,1}En fields of GICR_VPENDBASER when the vPEs are made resident again. Of course, we only support Group-1 for now... Signed-off-by: Marc Zyngier Reviewed-by: Zenghui Yu Link: https://lore.kernel.org/r/20200304203330.4967-22-maz@kernel.org --- virt/kvm/arm/arm.c | 8 ++++++++ virt/kvm/arm/vgic/vgic-mmio-v3.c | 5 ++++- 2 files changed, 12 insertions(+), 1 deletion(-) (limited to 'virt') diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c index eda7b624eab8..4d864f857ac8 100644 --- a/virt/kvm/arm/arm.c +++ b/virt/kvm/arm/arm.c @@ -625,6 +625,14 @@ static void check_vcpu_requests(struct kvm_vcpu *vcpu) if (kvm_check_request(KVM_REQ_RECORD_STEAL, vcpu)) kvm_update_stolen_time(vcpu); + + if (kvm_check_request(KVM_REQ_RELOAD_GICv4, vcpu)) { + /* The distributor enable bits were changed */ + preempt_disable(); + vgic_v4_put(vcpu, false); + vgic_v4_load(vcpu); + preempt_enable(); + } } } diff --git a/virt/kvm/arm/vgic/vgic-mmio-v3.c b/virt/kvm/arm/vgic/vgic-mmio-v3.c index 905032a03886..e72dcc454247 100644 --- a/virt/kvm/arm/vgic/vgic-mmio-v3.c +++ b/virt/kvm/arm/vgic/vgic-mmio-v3.c @@ -132,7 +132,10 @@ static void vgic_mmio_write_v3_misc(struct kvm_vcpu *vcpu, if (is_hwsgi != dist->nassgireq) vgic_v4_configure_vsgis(vcpu->kvm); - if (!was_enabled && dist->enabled) + if (kvm_vgic_global_state.has_gicv4_1 && + was_enabled != dist->enabled) + kvm_make_all_cpus_request(vcpu->kvm, KVM_REQ_RELOAD_GICv4); + else if (!was_enabled && dist->enabled) vgic_kick_vcpus(vcpu->kvm); mutex_unlock(&vcpu->kvm->lock); -- cgit v1.2.3-58-ga151