[Qemu-devel] [PATCH v12 4/5] hw/intc: Initial implementation of vGICv3

[Pavel Fedin <p.fedin@samsung.com>]

This is the initial version of KVM-accelerated GICv3 support.
State load and save are not yet supported, live migration is
not possible.

In order to get correct class name in a simpler way, gicv3_class_name()
function is implemented, similar to gic_class_name().

Signed-off-by: Pavel Fedin <p.fedin@samsung.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Tested-by: Ashok kumar <ashoks@broadcom.com>
---
 hw/intc/Makefile.objs   |   1 +
 hw/intc/arm_gicv3_kvm.c | 149 ++++++++++++++++++++++++++++++++++++++++++++++++
 target-arm/kvm_arm.h    |  10 ++++
 target-arm/machine.c    |  18 ++++++
 4 files changed, 178 insertions(+)
 create mode 100644 hw/intc/arm_gicv3_kvm.c

diff --git a/hw/intc/Makefile.objs b/hw/intc/Makefile.objs
index 1317e5a..004b0c2 100644
--- a/hw/intc/Makefile.objs
+++ b/hw/intc/Makefile.objs
@@ -17,6 +17,7 @@ common-obj-$(CONFIG_OPENPIC) += openpic.o
 
 obj-$(CONFIG_APIC) += apic.o apic_common.o
 obj-$(CONFIG_ARM_GIC_KVM) += arm_gic_kvm.o
+obj-$(call land,$(CONFIG_ARM_GIC_KVM),$(TARGET_AARCH64)) += arm_gicv3_kvm.o
 obj-$(CONFIG_STELLARIS) += armv7m_nvic.o
 obj-$(CONFIG_EXYNOS4) += exynos4210_gic.o exynos4210_combiner.o
 obj-$(CONFIG_GRLIB) += grlib_irqmp.o
diff --git a/hw/intc/arm_gicv3_kvm.c b/hw/intc/arm_gicv3_kvm.c
new file mode 100644
index 0000000..b48f78f
--- /dev/null
+++ b/hw/intc/arm_gicv3_kvm.c
@@ -0,0 +1,149 @@
+/*
+ * ARM Generic Interrupt Controller using KVM in-kernel support
+ *
+ * Copyright (c) 2015 Samsung Electronics Co., Ltd.
+ * Written by Pavel Fedin
+ * Based on vGICv2 code by Peter Maydell
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "hw/intc/arm_gicv3_common.h"
+#include "hw/sysbus.h"
+#include "sysemu/kvm.h"
+#include "kvm_arm.h"
+#include "vgic_common.h"
+
+#ifdef DEBUG_GICV3_KVM
+#define DPRINTF(fmt, ...) \
+    do { fprintf(stderr, "kvm_gicv3: " fmt, ## __VA_ARGS__); } while (0)
+#else
+#define DPRINTF(fmt, ...) \
+    do { } while (0)
+#endif
+
+#define TYPE_KVM_ARM_GICV3 "kvm-arm-gicv3"
+#define KVM_ARM_GICV3(obj) \
+     OBJECT_CHECK(GICv3State, (obj), TYPE_KVM_ARM_GICV3)
+#define KVM_ARM_GICV3_CLASS(klass) \
+     OBJECT_CLASS_CHECK(KVMARMGICv3Class, (klass), TYPE_KVM_ARM_GICV3)
+#define KVM_ARM_GICV3_GET_CLASS(obj) \
+     OBJECT_GET_CLASS(KVMARMGICv3Class, (obj), TYPE_KVM_ARM_GICV3)
+
+typedef struct KVMARMGICv3Class {
+    ARMGICv3CommonClass parent_class;
+    DeviceRealize parent_realize;
+    void (*parent_reset)(DeviceState *dev);
+} KVMARMGICv3Class;
+
+static void kvm_arm_gicv3_set_irq(void *opaque, int irq, int level)
+{
+    GICv3State *s = (GICv3State *)opaque;
+
+    kvm_arm_gic_set_irq(s->num_irq, irq, level);
+}
+
+static void kvm_arm_gicv3_put(GICv3State *s)
+{
+    /* TODO */
+    DPRINTF("Cannot put kernel gic state, no kernel interface\n");
+}
+
+static void kvm_arm_gicv3_get(GICv3State *s)
+{
+    /* TODO */
+    DPRINTF("Cannot get kernel gic state, no kernel interface\n");
+}
+
+static void kvm_arm_gicv3_reset(DeviceState *dev)
+{
+    GICv3State *s = ARM_GICV3_COMMON(dev);
+    KVMARMGICv3Class *kgc = KVM_ARM_GICV3_GET_CLASS(s);
+
+    DPRINTF("Reset\n");
+
+    kgc->parent_reset(dev);
+    kvm_arm_gicv3_put(s);
+}
+
+static void kvm_arm_gicv3_realize(DeviceState *dev, Error **errp)
+{
+    GICv3State *s = KVM_ARM_GICV3(dev);
+    KVMARMGICv3Class *kgc = KVM_ARM_GICV3_GET_CLASS(s);
+    Error *local_err = NULL;
+
+    DPRINTF("kvm_arm_gicv3_realize\n");
+
+    kgc->parent_realize(dev, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return;
+    }
+
+    if (s->security_extn) {
+        error_setg(errp, "the in-kernel VGICv3 does not implement the "
+                   "security extensions");
+        return;
+    }
+
+    gicv3_init_irqs_and_mmio(s, kvm_arm_gicv3_set_irq, NULL);
+
+    /* Try to create the device via the device control API */
+    s->dev_fd = kvm_create_device(kvm_state, KVM_DEV_TYPE_ARM_VGIC_V3, false);
+    if (s->dev_fd < 0) {
+        error_setg_errno(errp, -s->dev_fd, "error creating in-kernel VGIC");
+        return;
+    }
+
+    kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_NR_IRQS,
+                      0, &s->num_irq, true);
+
+    /* Tell the kernel to complete VGIC initialization now */
+    kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
+                      KVM_DEV_ARM_VGIC_CTRL_INIT, NULL, true);
+
+    kvm_arm_register_device(&s->iomem_dist, -1, KVM_DEV_ARM_VGIC_GRP_ADDR,
+                            KVM_VGIC_V3_ADDR_TYPE_DIST, s->dev_fd);
+    kvm_arm_register_device(&s->iomem_redist, -1, KVM_DEV_ARM_VGIC_GRP_ADDR,
+                            KVM_VGIC_V3_ADDR_TYPE_REDIST, s->dev_fd);
+}
+
+static void kvm_arm_gicv3_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    ARMGICv3CommonClass *agcc = ARM_GICV3_COMMON_CLASS(klass);
+    KVMARMGICv3Class *kgc = KVM_ARM_GICV3_CLASS(klass);
+
+    agcc->pre_save = kvm_arm_gicv3_get;
+    agcc->post_load = kvm_arm_gicv3_put;
+    kgc->parent_realize = dc->realize;
+    kgc->parent_reset = dc->reset;
+    dc->realize = kvm_arm_gicv3_realize;
+    dc->reset = kvm_arm_gicv3_reset;
+}
+
+static const TypeInfo kvm_arm_gicv3_info = {
+    .name = TYPE_KVM_ARM_GICV3,
+    .parent = TYPE_ARM_GICV3_COMMON,
+    .instance_size = sizeof(GICv3State),
+    .class_init = kvm_arm_gicv3_class_init,
+    .class_size = sizeof(KVMARMGICv3Class),
+};
+
+static void kvm_arm_gicv3_register_types(void)
+{
+    type_register_static(&kvm_arm_gicv3_info);
+}
+
+type_init(kvm_arm_gicv3_register_types)
diff --git a/target-arm/kvm_arm.h b/target-arm/kvm_arm.h
index b3e0ab7..b6f5b69 100644
--- a/target-arm/kvm_arm.h
+++ b/target-arm/kvm_arm.h
@@ -196,4 +196,14 @@ static inline const char *gic_class_name(void)
     return kvm_irqchip_in_kernel() ? "kvm-arm-gic" : "arm_gic";
 }
 
+/**
+ * gicv3_class_name
+ *
+ * Return name of GICv3 class to use depending on whether KVM acceleration is
+ * in use. May throw an error if the chosen implementation is not available.
+ *
+ * Returns: class name to use
+ */
+const char *gicv3_class_name(void);
+
 #endif
diff --git a/target-arm/machine.c b/target-arm/machine.c
index 32adfe7..36a0d15 100644
--- a/target-arm/machine.c
+++ b/target-arm/machine.c
@@ -1,5 +1,6 @@
 #include "hw/hw.h"
 #include "hw/boards.h"
+#include "qemu/error-report.h"
 #include "sysemu/kvm.h"
 #include "kvm_arm.h"
 #include "internals.h"
@@ -328,3 +329,20 @@ const VMStateDescription vmstate_arm_cpu = {
         NULL
     }
 };
+
+const char *gicv3_class_name(void)
+{
+    if (kvm_irqchip_in_kernel()) {
+#ifdef TARGET_AARCH64
+        return "kvm-arm-gicv3";
+#else
+        error_report("KVM GICv3 acceleration is not supported on this "
+                     "platform\n");
+#endif
+    } else {
+        /* TODO: Software emulation is not implemented yet */
+        error_report("KVM is currently required for GICv3 emulation\n");
+    }
+
+    exit(1);
+}
-- 
1.9.5.msysgit.0