Implement support for using the KVM in-kernel GIC for ARM.
Signed-off-by: Peter Maydell <peter.maydell@xxxxxxxxxx>
Reviewed-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
hw/a15mpcore.c | 8 ++-
hw/arm/Makefile.objs | 1 +
hw/kvm/arm_gic.c | 169 ++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 177 insertions(+), 1 deletion(-)
create mode 100644 hw/kvm/arm_gic.c
diff --git a/hw/a15mpcore.c b/hw/a15mpcore.c
index fe6c34c..97abe41 100644
--- a/hw/a15mpcore.c
+++ b/hw/a15mpcore.c
@@ -19,6 +19,7 @@
*/
#include "sysbus.h"
+#include "sysemu/kvm.h"
/* A15MP private memory region. */
@@ -40,8 +41,13 @@ static int a15mp_priv_init(SysBusDevice *dev)
{
A15MPPrivState *s = FROM_SYSBUS(A15MPPrivState, dev);
SysBusDevice *busdev;
+ const char *gictype = "arm_gic";
- s->gic = qdev_create(NULL, "arm_gic");
+ if (kvm_irqchip_in_kernel()) {
+ gictype = "kvm-arm-gic";
+ }
+
+ s->gic = qdev_create(NULL, gictype);
qdev_prop_set_uint32(s->gic, "num-cpu", s->num_cpu);
qdev_prop_set_uint32(s->gic, "num-irq", s->num_irq);
qdev_prop_set_uint32(s->gic, "revision", 2);
diff --git a/hw/arm/Makefile.objs b/hw/arm/Makefile.objs
index 6d049e7..38b10a8 100644
--- a/hw/arm/Makefile.objs
+++ b/hw/arm/Makefile.objs
@@ -31,5 +31,6 @@ obj-y += collie.o
obj-y += imx_serial.o imx_ccm.o imx_timer.o imx_avic.o
obj-y += kzm.o
obj-$(CONFIG_FDT) += ../device_tree.o
+obj-$(CONFIG_KVM) += kvm/arm_gic.o
obj-y := $(addprefix ../,$(obj-y))
diff --git a/hw/kvm/arm_gic.c b/hw/kvm/arm_gic.c
new file mode 100644
index 0000000..c3b73c4
--- /dev/null
+++ b/hw/kvm/arm_gic.c
@@ -0,0 +1,169 @@
+/*
+ * ARM Generic Interrupt Controller using KVM in-kernel support
+ *
+ * Copyright (c) 2012 Linaro Limited
+ * Written 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/sysbus.h"
+#include "sysemu/kvm.h"
+#include "kvm_arm.h"
+#include "hw/arm_gic_internal.h"
+
+#define TYPE_KVM_ARM_GIC "kvm-arm-gic"
+#define KVM_ARM_GIC(obj) \
+ OBJECT_CHECK(GICState, (obj), TYPE_KVM_ARM_GIC)
+#define KVM_ARM_GIC_CLASS(klass) \
+ OBJECT_CLASS_CHECK(KVMARMGICClass, (klass), TYPE_KVM_ARM_GIC)
+#define KVM_ARM_GIC_GET_CLASS(obj) \
+ OBJECT_GET_CLASS(KVMARMGICClass, (obj), TYPE_KVM_ARM_GIC)
+
+typedef struct KVMARMGICClass {
+ ARMGICCommonClass parent_class;
+ int (*parent_init)(SysBusDevice *dev);
+ void (*parent_reset)(DeviceState *dev);
+} KVMARMGICClass;
+
+static void kvm_arm_gic_set_irq(void *opaque, int irq, int level)
+{
+ /* Meaning of the 'irq' parameter:
+ * [0..N-1] : external interrupts
+ * [N..N+31] : PPI (internal) interrupts for CPU 0
+ * [N+32..N+63] : PPI (internal interrupts for CPU 1
+ * ...
+ * Convert this to the kernel's desired encoding, which
+ * has separate fields in the irq number for type,
+ * CPU number and interrupt number.
+ */
+ GICState *s = (GICState *)opaque;
+ int kvm_irq, irqtype, cpu;
+
+ if (irq < (s->num_irq - GIC_INTERNAL)) {
+ /* External interrupt. The kernel numbers these like the GIC
+ * hardware, with external interrupt IDs starting after the
+ * internal ones.
+ */
+ irqtype = KVM_ARM_IRQ_TYPE_SPI;
+ cpu = 0;
+ irq += GIC_INTERNAL;
+ } else {
+ /* Internal interrupt: decode into (cpu, interrupt id) */
+ irqtype = KVM_ARM_IRQ_TYPE_PPI;
+ irq -= (s->num_irq - GIC_INTERNAL);
+ cpu = irq / GIC_INTERNAL;
+ irq %= GIC_INTERNAL;
+ }
+ kvm_irq = (irqtype << KVM_ARM_IRQ_TYPE_SHIFT)
+ | (cpu << KVM_ARM_IRQ_VCPU_SHIFT) | irq;
+
+ kvm_set_irq(kvm_state, kvm_irq, !!level);
+}
+
+static void kvm_arm_gic_put(GICState *s)
+{
+ /* TODO: there isn't currently a kernel interface to set the GIC state */
+}
+
+static void kvm_arm_gic_get(GICState *s)
+{
+ /* TODO: there isn't currently a kernel interface to get the GIC state */
+}
+
+static void kvm_arm_gic_reset(DeviceState *dev)
+{
+ GICState *s = ARM_GIC_COMMON(dev);
+ KVMARMGICClass *kgc = KVM_ARM_GIC_GET_CLASS(s);
+ kgc->parent_reset(dev);
+ kvm_arm_gic_put(s);
+}
+
+static int kvm_arm_gic_init(SysBusDevice *dev)
+{
+ /* Device instance init function for the GIC sysbus device */
+ int i;
+ GICState *s = FROM_SYSBUS(GICState, dev);
+ KVMARMGICClass *kgc = KVM_ARM_GIC_GET_CLASS(s);
+
+ kgc->parent_init(dev);
+
+ i = s->num_irq - GIC_INTERNAL;
+ /* For the GIC, also expose incoming GPIO lines for PPIs for each CPU.
+ * GPIO array layout is thus:
+ * [0..N-1] SPIs
+ * [N..N+31] PPIs for CPU 0
+ * [N+32..N+63] PPIs for CPU 1
+ * ...
+ */
+ i += (GIC_INTERNAL * s->num_cpu);
+ qdev_init_gpio_in(&s->busdev.qdev, kvm_arm_gic_set_irq, i);
+ /* We never use our outbound IRQ lines but provide them so that
+ * we maintain the same interface as the non-KVM GIC.
+ */
+ for (i = 0; i < s->num_cpu; i++) {
+ sysbus_init_irq(&s->busdev, &s->parent_irq[i]);
+ }
+ /* Distributor */
+ memory_region_init_reservation(&s->iomem, "kvm-gic_dist", 0x1000);
+ sysbus_init_mmio(dev, &s->iomem);
+ kvm_arm_register_device(&s->iomem,
+ (KVM_ARM_DEVICE_VGIC_V2 << KVM_ARM_DEVICE_ID_SHIFT)
+ | KVM_VGIC_V2_ADDR_TYPE_DIST);
+ /* CPU interface for current core. Unlike arm_gic, we don't
+ * provide the "interface for core #N" memory regions, because
+ * cores with a VGIC don't have those.
+ */
+ memory_region_init_reservation(&s->cpuiomem[0], "kvm-gic_cpu", 0x1000);
+ sysbus_init_mmio(dev, &s->cpuiomem[0]);
+ kvm_arm_register_device(&s->cpuiomem[0],
+ (KVM_ARM_DEVICE_VGIC_V2 << KVM_ARM_DEVICE_ID_SHIFT)
+ | KVM_VGIC_V2_ADDR_TYPE_CPU);
+ /* TODO: we should tell the kernel at some point the address
+ * of the private peripheral base. However we don't currently have
+ * any convenient infrastructure to do that, and in any case the
+ * kernel doesn't yet implement an ioctl to let us tell it.
+ */
+ return 0;
+}
+
+static void kvm_arm_gic_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ SysBusDeviceClass *sbc = SYS_BUS_DEVICE_CLASS(klass);
+ ARMGICCommonClass *agcc = ARM_GIC_COMMON_CLASS(klass);
+ KVMARMGICClass *kgc = KVM_ARM_GIC_CLASS(klass);
+ agcc->pre_save = kvm_arm_gic_get;
+ agcc->post_load = kvm_arm_gic_put;
+ kgc->parent_init = sbc->init;
+ kgc->parent_reset = dc->reset;
+ sbc->init = kvm_arm_gic_init;
+ dc->reset = kvm_arm_gic_reset;
+ dc->no_user = 1;
+}
+
+static const TypeInfo kvm_arm_gic_info = {
+ .name = TYPE_KVM_ARM_GIC,
+ .parent = TYPE_ARM_GIC_COMMON,
+ .instance_size = sizeof(GICState),
+ .class_init = kvm_arm_gic_class_init,
+ .class_size = sizeof(KVMARMGICClass),
+};
+
+static void kvm_arm_gic_register_types(void)
+{
+ type_register_static(&kvm_arm_gic_info);
+}
+
+type_init(kvm_arm_gic_register_types)
--
1.7.9.5
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