This patches enables ACPI support for KVM virtual GICv3. KVM parses
ACPI table for virt GIC related information and initializes resources.
Signed-off-by: Wei Huang <wei@xxxxxxxxxx>
---
virt/kvm/arm/vgic-v3.c | 40 +++++++++++++++++++++++++++++++++++++++-
1 file changed, 39 insertions(+), 1 deletion(-)
diff --git a/virt/kvm/arm/vgic-v3.c b/virt/kvm/arm/vgic-v3.c
index 99d0f9f..2e4df78 100644
--- a/virt/kvm/arm/vgic-v3.c
+++ b/virt/kvm/arm/vgic-v3.c
@@ -292,6 +292,44 @@ int vgic_v3_acpi_probe(struct acpi_madt_generic_interrupt *vgic_acpi,
const struct vgic_ops **ops,
const struct vgic_params **params)
{
- return -EINVAL;
+ int ret = 0;
+ struct vgic_params *vgic = &vgic_v3_params;
+ int irq_mode;
+
+ /* IRQ trigger mode */
+ irq_mode = (vgic_acpi->flags & ACPI_MADT_VGIC_IRQ_MODE) ?
+ ACPI_EDGE_SENSITIVE : ACPI_LEVEL_SENSITIVE;
+ vgic->maint_irq = acpi_register_gsi(NULL, vgic_acpi->vgic_interrupt,
+ irq_mode, ACPI_ACTIVE_HIGH);
+ if (!vgic->maint_irq) {
+ kvm_err("Cannot register VGIC ACPI maintenance irq\n");
+ ret = -ENXIO;
+ goto out;
+ }
+
+ ich_vtr_el2 = kvm_call_hyp(__vgic_v3_get_ich_vtr_el2);
+ vgic->nr_lr = (ich_vtr_el2 & 0xf) + 1;
+ vgic->can_emulate_gicv2 = false;
+
+ vgic->vcpu_base = vgic_acpi->gicv_base_address;
+
+ if (vgic->vcpu_base == 0)
+ kvm_info("disabling GICv2 emulation\n");
+ else {
+ vgic->can_emulate_gicv2 = true;
+ kvm_register_device_ops(&kvm_arm_vgic_v2_ops,
+ KVM_DEV_TYPE_ARM_VGIC_V2);
+ }
+
+ kvm_register_device_ops(&kvm_arm_vgic_v3_ops, KVM_DEV_TYPE_ARM_VGIC_V3);
+
+ vgic->vctrl_base = NULL;
+ vgic->type = VGIC_V3;
+ vgic->max_gic_vcpus = KVM_MAX_VCPUS;
+
+ *ops = &vgic_v3_ops;
+ *params = vgic;
+out:
+ return ret;
}
#endif /* CONFIG_ACPI */
--
1.8.3.1
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