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SubjectRe: [RFC v2 11/12] KVM: arm/arm64: Implement KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION
On 27 March 2018 at 15:04, Eric Auger <eric.auger@redhat.com> wrote:
> 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>
> ---
> virt/kvm/arm/vgic/vgic-kvm-device.c | 40 +++++++++++++++++++++++++++++++++++--
> virt/kvm/arm/vgic/vgic-mmio-v3.c | 4 ++--
> virt/kvm/arm/vgic/vgic.h | 9 ++++++++-
> 3 files changed, 48 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..a2b99e4 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 +104,40 @@ 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;

Here you check whether rdreg is NULL...

> +
> + *addr_ptr = rdreg->base & index &

...but here you dereference it anyway. Missing "goto out"/break/other
control flow?

> + (uint64_t)rdreg->count << KVM_VGIC_V3_RDIST_COUNT_SHIFT;
> + break;
> + }

I was looking for the code which checked "EINVAL if you
already used KVM_VGIC_V3_ADDR_TYPE_REDIST", but couldn't
see it. Is that handled by one of the helper functions?

> default:
> r = -ENODEV;
> }
> @@ -674,6 +709,7 @@ 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 89faadc..45287a0 100644
> --- a/virt/kvm/arm/vgic/vgic-mmio-v3.c
> +++ b/virt/kvm/arm/vgic/vgic-mmio-v3.c
> @@ -766,11 +766,11 @@ 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;

thanks
-- PMM

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