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Subject[RFC 32/55] KVM: arm/arm64: register GICH iodev for the guest hypervisor
Date
Register a device for the virtual interface control block(GICH) access
from the guest hypervisor.

TODO: Get GICH address from DT, which is hardcoded now.

Signed-off-by: Jintack Lim <jintack@cs.columbia.edu>
---
arch/arm64/include/uapi/asm/kvm.h | 6 ++++++
include/kvm/arm_vgic.h | 5 ++++-
virt/kvm/arm/vgic/vgic-mmio.c | 6 ++++++
virt/kvm/arm/vgic/vgic-v2-nested.c | 24 ++++++++++++++++++++++++
virt/kvm/arm/vgic/vgic-v2.c | 7 +++++++
virt/kvm/arm/vgic/vgic.h | 6 ++++++
6 files changed, 53 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h
index 78117bf..3995d3d 100644
--- a/arch/arm64/include/uapi/asm/kvm.h
+++ b/arch/arm64/include/uapi/asm/kvm.h
@@ -99,6 +99,12 @@ struct kvm_regs {
#define KVM_ARM_VCPU_PMU_V3 3 /* Support guest PMUv3 */
#define KVM_ARM_VCPU_NESTED_VIRT 4 /* Support nested virtual EL2 */

+/* FIXME: This should come from DT */
+#ifdef CONFIG_KVM_ARM_NESTED_HYP
+#define KVM_VGIC_V2_GICH_BASE 0x08030000
+#define KVM_VGIC_V2_GICH_SIZE 0x2000
+#endif
+
struct kvm_vcpu_init {
__u32 target;
__u32 features[7];
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index fc882d6..5bda20c 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -125,7 +125,8 @@ enum iodev_type {
IODEV_CPUIF,
IODEV_DIST,
IODEV_REDIST,
- IODEV_ITS
+ IODEV_ITS,
+ IODEV_GICH,
};

struct vgic_io_device {
@@ -198,6 +199,8 @@ struct vgic_dist {

struct vgic_io_device dist_iodev;

+ struct vgic_io_device hyp_iodev;
+
bool has_its;

/*
diff --git a/virt/kvm/arm/vgic/vgic-mmio.c b/virt/kvm/arm/vgic/vgic-mmio.c
index 049c570..2e4097d 100644
--- a/virt/kvm/arm/vgic/vgic-mmio.c
+++ b/virt/kvm/arm/vgic/vgic-mmio.c
@@ -512,6 +512,9 @@ static int dispatch_mmio_read(struct kvm_vcpu *vcpu, struct kvm_io_device *dev,
case IODEV_ITS:
data = region->its_read(vcpu->kvm, iodev->its, addr, len);
break;
+ case IODEV_GICH:
+ data = region->read(vcpu, addr, len);
+ break;
}

vgic_data_host_to_mmio_bus(val, len, data);
@@ -543,6 +546,9 @@ static int dispatch_mmio_write(struct kvm_vcpu *vcpu, struct kvm_io_device *dev,
case IODEV_ITS:
region->its_write(vcpu->kvm, iodev->its, addr, len, data);
break;
+ case IODEV_GICH:
+ region->write(vcpu, addr, len, data);
+ break;
}

return 0;
diff --git a/virt/kvm/arm/vgic/vgic-v2-nested.c b/virt/kvm/arm/vgic/vgic-v2-nested.c
index 85f646b..cb55324 100644
--- a/virt/kvm/arm/vgic/vgic-v2-nested.c
+++ b/virt/kvm/arm/vgic/vgic-v2-nested.c
@@ -206,6 +206,30 @@ static void vgic_mmio_write_v2_gich(struct kvm_vcpu *vcpu,
4 * VGIC_V2_MAX_LRS, VGIC_ACCESS_32bit),
};

+int vgic_register_gich_iodev(struct kvm *kvm, struct vgic_dist *dist)
+{
+ struct vgic_io_device *io_device = &kvm->arch.vgic.hyp_iodev;
+ int ret = 0;
+ unsigned int len;
+
+ len = KVM_VGIC_V2_GICH_SIZE;
+
+ io_device->regions = vgic_v2_gich_registers;
+ io_device->nr_regions = ARRAY_SIZE(vgic_v2_gich_registers);
+ kvm_iodevice_init(&io_device->dev, &kvm_io_gic_ops);
+
+ io_device->base_addr = KVM_VGIC_V2_GICH_BASE;
+ io_device->iodev_type = IODEV_GICH;
+ io_device->redist_vcpu = NULL;
+
+ mutex_lock(&kvm->slots_lock);
+ ret = kvm_io_bus_register_dev(kvm, KVM_MMIO_BUS, KVM_VGIC_V2_GICH_BASE,
+ len, &io_device->dev);
+ mutex_unlock(&kvm->slots_lock);
+
+ return ret;
+}
+
/*
* For LRs which have HW bit set such as timer interrupts, we modify them to
* have the host hardware interrupt number instead of the virtual one programmed
diff --git a/virt/kvm/arm/vgic/vgic-v2.c b/virt/kvm/arm/vgic/vgic-v2.c
index 9bab867..b8b73fd 100644
--- a/virt/kvm/arm/vgic/vgic-v2.c
+++ b/virt/kvm/arm/vgic/vgic-v2.c
@@ -280,6 +280,13 @@ int vgic_v2_map_resources(struct kvm *kvm)
goto out;
}

+ /* Register virtual GICH interface to kvm io bus */
+ ret = vgic_register_gich_iodev(kvm, dist);
+ if (ret) {
+ kvm_err("Unable to register VGIC GICH regions\n");
+ goto out;
+ }
+
if (!static_branch_unlikely(&vgic_v2_cpuif_trap)) {
ret = kvm_phys_addr_ioremap(kvm, dist->vgic_cpu_base,
kvm_vgic_global_state.vcpu_base,
diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h
index 2aef680..11d61a7 100644
--- a/virt/kvm/arm/vgic/vgic.h
+++ b/virt/kvm/arm/vgic/vgic.h
@@ -121,8 +121,14 @@ static inline int vgic_its_inject_msi(struct kvm *kvm, struct kvm_msi *msi)
int vgic_init(struct kvm *kvm);

#ifdef CONFIG_KVM_ARM_NESTED_HYP
+int vgic_register_gich_iodev(struct kvm *kvm, struct vgic_dist *dist);
void vgic_init_nested(struct kvm_vcpu *vcpu);
#else
+static inline int vgic_register_gich_iodev(struct kvm *kvm,
+ struct vgic_dist *dist)
+{
+ return 0;
+}
static inline void vgic_init_nested(struct kvm_vcpu *vcpu)
{
struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
--
1.9.1

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