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Subject[PATCH v4 11/12] KVM: arm/arm64: Implement KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION
Date
Now all the internals are ready to handle multiple redistributor
regions, let's allow the userspace to register them.

Signed-off-by: Eric Auger <eric.auger@redhat.com>

---
v3 -> v4:
- vgic_v3_rdist_region_from_index is introduced in this patch

v2 -> v3:
- early exit if vgic_v3_rdist_region_from_index() fails
---
virt/kvm/arm/vgic/vgic-kvm-device.c | 42 +++++++++++++++++++++++++++++++++++--
virt/kvm/arm/vgic/vgic-mmio-v3.c | 4 ++--
virt/kvm/arm/vgic/vgic-v3.c | 14 +++++++++++++
virt/kvm/arm/vgic/vgic.h | 13 +++++++++++-
4 files changed, 68 insertions(+), 5 deletions(-)

diff --git a/virt/kvm/arm/vgic/vgic-kvm-device.c b/virt/kvm/arm/vgic/vgic-kvm-device.c
index e7b5a86..00e03d3 100644
--- a/virt/kvm/arm/vgic/vgic-kvm-device.c
+++ b/virt/kvm/arm/vgic/vgic-kvm-device.c
@@ -65,7 +65,8 @@ int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write)
{
int r = 0;
struct vgic_dist *vgic = &kvm->arch.vgic;
- phys_addr_t *addr_ptr, alignment;
+ phys_addr_t *addr_ptr = NULL;
+ phys_addr_t alignment;
uint64_t undef_value = VGIC_ADDR_UNDEF;

mutex_lock(&kvm->lock);
@@ -92,7 +93,7 @@ int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write)
if (r)
break;
if (write) {
- r = vgic_v3_set_redist_base(kvm, *addr);
+ r = vgic_v3_set_redist_base(kvm, 0, *addr, 0);
goto out;
}
rdreg = list_first_entry(&vgic->rd_regions,
@@ -103,6 +104,42 @@ int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write)
addr_ptr = &rdreg->base;
break;
}
+ case KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION:
+ {
+ struct vgic_redist_region *rdreg;
+ uint8_t index;
+
+ r = vgic_check_type(kvm, KVM_DEV_TYPE_ARM_VGIC_V3);
+ if (r)
+ break;
+
+ index = *addr & KVM_VGIC_V3_RDIST_INDEX_MASK;
+
+ if (write) {
+ gpa_t base = *addr & KVM_VGIC_V3_RDIST_BASE_MASK;
+ uint32_t count = (*addr & KVM_VGIC_V3_RDIST_COUNT_MASK)
+ >> KVM_VGIC_V3_RDIST_COUNT_SHIFT;
+ uint8_t flags = (*addr & KVM_VGIC_V3_RDIST_FLAGS_MASK)
+ >> KVM_VGIC_V3_RDIST_FLAGS_SHIFT;
+
+ if (!count || flags)
+ r = -EINVAL;
+ else
+ r = vgic_v3_set_redist_base(kvm, index,
+ base, count);
+ goto out;
+ }
+
+ rdreg = vgic_v3_rdist_region_from_index(kvm, index);
+ if (!rdreg) {
+ r = -ENODEV;
+ goto out;
+ }
+
+ *addr_ptr = rdreg->base & index &
+ (uint64_t)rdreg->count << KVM_VGIC_V3_RDIST_COUNT_SHIFT;
+ break;
+ }
default:
r = -ENODEV;
}
@@ -674,6 +711,7 @@ static int vgic_v3_has_attr(struct kvm_device *dev,
switch (attr->attr) {
case KVM_VGIC_V3_ADDR_TYPE_DIST:
case KVM_VGIC_V3_ADDR_TYPE_REDIST:
+ case KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION:
return 0;
}
break;
diff --git a/virt/kvm/arm/vgic/vgic-mmio-v3.c b/virt/kvm/arm/vgic/vgic-mmio-v3.c
index 1b1e07f..fcebd42 100644
--- a/virt/kvm/arm/vgic/vgic-mmio-v3.c
+++ b/virt/kvm/arm/vgic/vgic-mmio-v3.c
@@ -764,11 +764,11 @@ static int vgic_v3_insert_redist_region(struct kvm *kvm, uint32_t index,
return ret;
}

-int vgic_v3_set_redist_base(struct kvm *kvm, u64 addr)
+int vgic_v3_set_redist_base(struct kvm *kvm, u32 index, u64 addr, u32 count)
{
int ret;

- ret = vgic_v3_insert_redist_region(kvm, 0, addr, 0);
+ ret = vgic_v3_insert_redist_region(kvm, index, addr, count);
if (ret)
return ret;

diff --git a/virt/kvm/arm/vgic/vgic-v3.c b/virt/kvm/arm/vgic/vgic-v3.c
index 5563671..ba3baa2 100644
--- a/virt/kvm/arm/vgic/vgic-v3.c
+++ b/virt/kvm/arm/vgic/vgic-v3.c
@@ -482,6 +482,20 @@ struct vgic_redist_region *vgic_v3_rdist_free_slot(struct list_head *rd_regions)
return NULL;
}

+struct vgic_redist_region *vgic_v3_rdist_region_from_index(struct kvm *kvm,
+ uint32_t index)
+{
+ struct list_head *rd_regions = &kvm->arch.vgic.rd_regions;
+ struct vgic_redist_region *rdreg;
+
+ list_for_each_entry(rdreg, rd_regions, list) {
+ if (rdreg->index == index)
+ return rdreg;
+ }
+ return NULL;
+}
+
+
int vgic_v3_map_resources(struct kvm *kvm)
{
struct vgic_dist *dist = &kvm->arch.vgic;
diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h
index 6af7d8a..9552d26 100644
--- a/virt/kvm/arm/vgic/vgic.h
+++ b/virt/kvm/arm/vgic/vgic.h
@@ -96,6 +96,13 @@
/* we only support 64 kB translation table page size */
#define KVM_ITS_L1E_ADDR_MASK GENMASK_ULL(51, 16)

+#define KVM_VGIC_V3_RDIST_INDEX_MASK GENMASK_ULL(11, 0)
+#define KVM_VGIC_V3_RDIST_FLAGS_MASK GENMASK_ULL(15, 12)
+#define KVM_VGIC_V3_RDIST_FLAGS_SHIFT 12
+#define KVM_VGIC_V3_RDIST_BASE_MASK GENMASK_ULL(51, 16)
+#define KVM_VGIC_V3_RDIST_COUNT_MASK GENMASK_ULL(63, 52)
+#define KVM_VGIC_V3_RDIST_COUNT_SHIFT 52
+
/* Requires the irq_lock to be held by the caller. */
static inline bool irq_is_pending(struct vgic_irq *irq)
{
@@ -201,7 +208,7 @@ int vgic_v3_probe(const struct gic_kvm_info *info);
int vgic_v3_map_resources(struct kvm *kvm);
int vgic_v3_lpi_sync_pending_status(struct kvm *kvm, struct vgic_irq *irq);
int vgic_v3_save_pending_tables(struct kvm *kvm);
-int vgic_v3_set_redist_base(struct kvm *kvm, u64 addr);
+int vgic_v3_set_redist_base(struct kvm *kvm, u32 index, u64 addr, u32 count);
int vgic_register_redist_iodev(struct kvm_vcpu *vcpu);
bool vgic_v3_check_base(struct kvm *kvm);

@@ -270,6 +277,10 @@ vgic_v3_rd_region_size(struct kvm *kvm, struct vgic_redist_region *rdreg)
else
return rdreg->count * KVM_VGIC_V3_REDIST_SIZE;
}
+
+struct vgic_redist_region *vgic_v3_rdist_region_from_index(struct kvm *kvm,
+ uint32_t index);
+
bool vgic_v3_rdist_overlap(struct kvm *kvm, gpa_t base, size_t size);

static inline bool vgic_dist_overlap(struct kvm *kvm, gpa_t base, size_t size)
--
2.5.5
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