[PATCH v2 4/6] hw/intc/arm_gicv3: Enable support for setting vGIC maintenance IRQ

[Haibo Xu]

Using the new VGIC KVM device attribute to set the maintenance IRQ.
This is fixed to use IRQ 25(PPI 9), as a platform decision matching
the arm64 SBSA recommendation.

Signed-off-by: Haibo Xu <haibo...@linaro.org>
---
 hw/arm/virt.c                      |  5 +++++
 hw/intc/arm_gicv3_common.c         |  1 +
 hw/intc/arm_gicv3_kvm.c            | 16 ++++++++++++++++
 include/hw/intc/arm_gicv3_common.h |  1 +
 4 files changed, 23 insertions(+)

diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index aa2bbd14e0..92d46ebcfe 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -663,6 +663,11 @@ static void create_gic(VirtMachineState *vms)
             qdev_prop_set_uint32(vms->gic, "redist-region-count[1]",
                 MIN(smp_cpus - redist0_count, redist1_capacity));
         }
+
+        if (kvm_irqchip_in_kernel()) {
+            bool el2 = object_property_get_bool(OBJECT(first_cpu), "el2", 
NULL);
+            qdev_prop_set_bit(vms->gic, "has-virtualization-extensions", el2);
+        }
     } else {
         if (!kvm_irqchip_in_kernel()) {
             qdev_prop_set_bit(vms->gic, "has-virtualization-extensions",
diff --git a/hw/intc/arm_gicv3_common.c b/hw/intc/arm_gicv3_common.c
index 58ef65f589..3ac10c8e61 100644
--- a/hw/intc/arm_gicv3_common.c
+++ b/hw/intc/arm_gicv3_common.c
@@ -495,6 +495,7 @@ static Property arm_gicv3_common_properties[] = {
     DEFINE_PROP_UINT32("num-irq", GICv3State, num_irq, 32),
     DEFINE_PROP_UINT32("revision", GICv3State, revision, 3),
     DEFINE_PROP_BOOL("has-security-extensions", GICv3State, security_extn, 0),
+    DEFINE_PROP_BOOL("has-virtualization-extensions", GICv3State, virt_extn, 
0),
     DEFINE_PROP_ARRAY("redist-region-count", GICv3State, nb_redist_regions,
                       redist_region_count, qdev_prop_uint32, uint32_t),
     DEFINE_PROP_END_OF_LIST(),
diff --git a/hw/intc/arm_gicv3_kvm.c b/hw/intc/arm_gicv3_kvm.c
index 65a4c880a3..1e1ca66e2c 100644
--- a/hw/intc/arm_gicv3_kvm.c
+++ b/hw/intc/arm_gicv3_kvm.c
@@ -826,6 +826,22 @@ static void kvm_arm_gicv3_realize(DeviceState *dev, Error 
**errp)
     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
                       KVM_DEV_ARM_VGIC_CTRL_INIT, NULL, true, &error_abort);
 
+    if (s->virt_extn) {
+        bool maint_irq_allowed;
+        uint32_t maint_irq = 25;
+
+        maint_irq_allowed =
+            kvm_device_check_attr(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_MAINT_IRQ, 
0);
+        if (!maint_irq_allowed) {
+            error_setg(errp, "VGICv3 setting maintenance IRQ are not "
+                             "supported by this host kernel");
+            return;
+        }
+
+        kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_MAINT_IRQ,
+                          0, &maint_irq, true, &error_abort);
+    }
+
     kvm_arm_register_device(&s->iomem_dist, -1, KVM_DEV_ARM_VGIC_GRP_ADDR,
                             KVM_VGIC_V3_ADDR_TYPE_DIST, s->dev_fd, 0);
 
diff --git a/include/hw/intc/arm_gicv3_common.h 
b/include/hw/intc/arm_gicv3_common.h
index 91491a2f66..921ddc2c5f 100644
--- a/include/hw/intc/arm_gicv3_common.h
+++ b/include/hw/intc/arm_gicv3_common.h
@@ -220,6 +220,7 @@ struct GICv3State {
     uint32_t num_irq;
     uint32_t revision;
     bool security_extn;
+    bool virt_extn;
     bool irq_reset_nonsecure;
     bool gicd_no_migration_shift_bug;
 
-- 
2.17.1