On Fri, Apr 27, 2018 at 04:14:59PM +0200, Eric Auger wrote:
> vgic_v3_check_base() currently only handles the case of a unique
> legacy redistributor region whose size is not explicitly set but
> infered, instead, from the number of online vcpus.
nit: inferred
>
> We adapt it to handle the case of multiple redistributor regions
> with explicitly defined size. We rely on two new helpers:
> - vgic_v3_rdist_overlap() is used to detect overlap with the dist
> region if defined
> - vgic_v3_rd_region_size computes the size of the redist region,
> would it be a legacy unique region or a new explicitly sized
> region.
>
> Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>
>
> ---
>
> v3 -> v4:
> - squash vgic_v3_check_base adaptation and vgic_v3_rdist_overlap
> + vgic_v3_rd_region_size introduction and put this patch
> before v3 patch 6
> ---
> virt/kvm/arm/vgic/vgic-v3.c | 49 +++++++++++++++++++++++++++++----------------
> virt/kvm/arm/vgic/vgic.h | 10 +++++++++
> 2 files changed, 42 insertions(+), 17 deletions(-)
>
> diff --git a/virt/kvm/arm/vgic/vgic-v3.c b/virt/kvm/arm/vgic/vgic-v3.c
> index f81a63a..c4a2a46 100644
> --- a/virt/kvm/arm/vgic/vgic-v3.c
> +++ b/virt/kvm/arm/vgic/vgic-v3.c
> @@ -410,6 +410,29 @@ int vgic_v3_save_pending_tables(struct kvm *kvm)
> return 0;
> }
>
> +/**
> + * vgic_v3_rdist_overlap - check if a region overlaps with any
> + * existing redistributor region
> + *
> + * @kvm: kvm handle
> + * @base: base of the region
> + * @size: size of region
> + *
> + * Return: true if there is an overlap
> + */
> +bool vgic_v3_rdist_overlap(struct kvm *kvm, gpa_t base, size_t size)
> +{
> + struct vgic_dist *d = &kvm->arch.vgic;
> + struct vgic_redist_region *rdreg;
> +
> + list_for_each_entry(rdreg, &d->rd_regions, list) {
> + if ((base + size > rdreg->base) &&
> + (base < rdreg->base + vgic_v3_rd_region_size(kvm, rdreg)))
> + return true;
> + }
> + return false;
> +}
> +
> /*
> * Check for overlapping regions and for regions crossing the end of memory
> * for base addresses which have already been set.
> @@ -417,31 +440,23 @@ int vgic_v3_save_pending_tables(struct kvm *kvm)
> bool vgic_v3_check_base(struct kvm *kvm)
> {
> struct vgic_dist *d = &kvm->arch.vgic;
> - gpa_t redist_size = KVM_VGIC_V3_REDIST_SIZE;
> - struct vgic_redist_region *rdreg =
> - list_first_entry(&d->rd_regions,
> - struct vgic_redist_region, list);
> -
> - redist_size *= atomic_read(&kvm->online_vcpus);
> + struct vgic_redist_region *rdreg;
>
> if (!IS_VGIC_ADDR_UNDEF(d->vgic_dist_base) &&
> d->vgic_dist_base + KVM_VGIC_V3_DIST_SIZE < d->vgic_dist_base)
> return false;
>
> - if (rdreg && (rdreg->base + redist_size < rdreg->base))
> - return false;
> + list_for_each_entry(rdreg, &d->rd_regions, list) {
> + if (rdreg->base + vgic_v3_rd_region_size(kvm, rdreg) <
> + rdreg->base)
> + return false;
> + }
>
> - /* Both base addresses must be set to check if they overlap */
> - if (IS_VGIC_ADDR_UNDEF(d->vgic_dist_base) || !rdreg)
> + if (IS_VGIC_ADDR_UNDEF(d->vgic_dist_base))
> return true;
>
> - if (d->vgic_dist_base + KVM_VGIC_V3_DIST_SIZE <= rdreg->base)
> - return true;
> -
> - if (rdreg->base + redist_size <= d->vgic_dist_base)
> - return true;
> -
> - return false;
> + return !vgic_v3_rdist_overlap(kvm, d->vgic_dist_base,
> + KVM_VGIC_V3_DIST_SIZE);
> }
>
> /**
> diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h
> index fea32cb..e6e3ae9 100644
> --- a/virt/kvm/arm/vgic/vgic.h
> +++ b/virt/kvm/arm/vgic/vgic.h
> @@ -262,6 +262,16 @@ vgic_v3_redist_region_full(struct vgic_redist_region *region)
>
> struct vgic_redist_region *vgic_v3_rdist_free_slot(struct list_head *rdregs);
>
> +static inline size_t
> +vgic_v3_rd_region_size(struct kvm *kvm, struct vgic_redist_region *rdreg)
> +{
> + if (!rdreg->count)
> + return atomic_read(&kvm->online_vcpus) * KVM_VGIC_V3_REDIST_SIZE;
> + else
> + return rdreg->count * KVM_VGIC_V3_REDIST_SIZE;
> +}
> +bool vgic_v3_rdist_overlap(struct kvm *kvm, gpa_t base, size_t size);
> +
> int vgic_its_resolve_lpi(struct kvm *kvm, struct vgic_its *its,
> u32 devid, u32 eventid, struct vgic_irq **irq);
> struct vgic_its *vgic_msi_to_its(struct kvm *kvm, struct kvm_msi *msi);
> --
> 2.5.5
>
Reviewed-by: Christoffer Dall <christoffer.dall@xxxxxxx>
