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authorMarc Zyngier <marc.zyngier@arm.com>2017-10-27 17:28:48 +0300
committerChristoffer Dall <christoffer.dall@linaro.org>2017-11-10 11:42:59 +0300
commitbdb2d2ccac65dfee0db8fa4a8247df788a942439 (patch)
tree66518ebbcad8614c4d36d29ac10b0b4dd52590ed /virt
parentc971968071d3ec5e8605f9da9e867441e2edf000 (diff)
downloadlinux-bdb2d2ccac65dfee0db8fa4a8247df788a942439.tar.xz
KVM: arm/arm64: GICv4: Add doorbell interrupt handling
When a vPE is not running, a VLPI being made pending results in a doorbell interrupt being delivered. Let's handle this interrupt and update the pending_last flag that indicates that VLPIs are pending. The corresponding vcpu is also kicked into action. Special care is taken to prevent the doorbell from being enabled at request time (this is controlled separately), and to make the disabling on the interrupt non-lazy. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Reviewed-by: Eric Auger <eric.auger@redhat.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/arm/vgic/vgic-v4.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/virt/kvm/arm/vgic/vgic-v4.c b/virt/kvm/arm/vgic/vgic-v4.c
index 2edfe23c8238..796e00c77903 100644
--- a/virt/kvm/arm/vgic/vgic-v4.c
+++ b/virt/kvm/arm/vgic/vgic-v4.c
@@ -16,12 +16,24 @@
*/
#include <linux/interrupt.h>
+#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/kvm_host.h>
#include <linux/irqchip/arm-gic-v3.h>
#include "vgic.h"
+static irqreturn_t vgic_v4_doorbell_handler(int irq, void *info)
+{
+ struct kvm_vcpu *vcpu = info;
+
+ vcpu->arch.vgic_cpu.vgic_v3.its_vpe.pending_last = true;
+ kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu);
+ kvm_vcpu_kick(vcpu);
+
+ return IRQ_HANDLED;
+}
+
/**
* vgic_v4_init - Initialize the GICv4 data structures
* @kvm: Pointer to the VM being initialized
@@ -61,6 +73,33 @@ int vgic_v4_init(struct kvm *kvm)
return ret;
}
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ int irq = dist->its_vm.vpes[i]->irq;
+
+ /*
+ * Don't automatically enable the doorbell, as we're
+ * flipping it back and forth when the vcpu gets
+ * blocked. Also disable the lazy disabling, as the
+ * doorbell could kick us out of the guest too
+ * early...
+ */
+ irq_set_status_flags(irq, IRQ_NOAUTOEN | IRQ_DISABLE_UNLAZY);
+ ret = request_irq(irq, vgic_v4_doorbell_handler,
+ 0, "vcpu", vcpu);
+ if (ret) {
+ kvm_err("failed to allocate vcpu IRQ%d\n", irq);
+ /*
+ * Trick: adjust the number of vpes so we know
+ * how many to nuke on teardown...
+ */
+ dist->its_vm.nr_vpes = i;
+ break;
+ }
+ }
+
+ if (ret)
+ vgic_v4_teardown(kvm);
+
return ret;
}
@@ -73,10 +112,19 @@ int vgic_v4_init(struct kvm *kvm)
void vgic_v4_teardown(struct kvm *kvm)
{
struct its_vm *its_vm = &kvm->arch.vgic.its_vm;
+ int i;
if (!its_vm->vpes)
return;
+ for (i = 0; i < its_vm->nr_vpes; i++) {
+ struct kvm_vcpu *vcpu = kvm_get_vcpu(kvm, i);
+ int irq = its_vm->vpes[i]->irq;
+
+ irq_clear_status_flags(irq, IRQ_NOAUTOEN | IRQ_DISABLE_UNLAZY);
+ free_irq(irq, vcpu);
+ }
+
its_free_vcpu_irqs(its_vm);
kfree(its_vm->vpes);
its_vm->nr_vpes = 0;