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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 <maz@kernel.org>
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Link: https://lore.kernel.org/r/20200304203330.4967-22-maz@kernel.org
This commit is contained in:
Marc Zyngier 2020-03-04 20:33:28 +00:00
parent 2291ff2f2a
commit d9c3872cd2
4 changed files with 14 additions and 1 deletions
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1
arch/arm/include/asm/kvm_host.h
View File

@ -39,6 +39,7 @@
#define KVM_REQ_IRQ_PENDING KVM_ARCH_REQ(1)
#define KVM_REQ_VCPU_RESET KVM_ARCH_REQ(2)
#define KVM_REQ_RECORD_STEAL KVM_ARCH_REQ(3)
#define KVM_REQ_RELOAD_GICv4 KVM_ARCH_REQ(4)
DECLARE_STATIC_KEY_FALSE(userspace_irqchip_in_use);

1
arch/arm64/include/asm/kvm_host.h
View File

@ -44,6 +44,7 @@
#define KVM_REQ_IRQ_PENDING KVM_ARCH_REQ(1)
#define KVM_REQ_VCPU_RESET KVM_ARCH_REQ(2)
#define KVM_REQ_RECORD_STEAL KVM_ARCH_REQ(3)
#define KVM_REQ_RELOAD_GICv4 KVM_ARCH_REQ(4)
DECLARE_STATIC_KEY_FALSE(userspace_irqchip_in_use);

8
virt/kvm/arm/arm.c
View File

@ -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();
}
}
}

5
virt/kvm/arm/vgic/vgic-mmio-v3.c
View File

@ -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);