Hi Eric, On Wed, Sep 29, 2021 at 06:23:04PM +0200, Eric Auger wrote: > Hi Ricardo, > > On 9/28/21 8:47 PM, Ricardo Koller wrote: > > Verify that the redistributor regions do not extend beyond the > > VM-specified IPA range (phys_size). This can happen when using > > KVM_VGIC_V3_ADDR_TYPE_REDIST or KVM_VGIC_V3_ADDR_TYPE_REDIST_REGIONS > > with: > > > > base + size > phys_size AND base < phys_size > > > > Add the missing check into vgic_v3_alloc_redist_region() which is called > > when setting the regions, and into vgic_v3_check_base() which is called > > when attempting the first vcpu-run. The vcpu-run check does not apply to > > KVM_VGIC_V3_ADDR_TYPE_REDIST_REGIONS because the regions size is known > > before the first vcpu-run. Note that using the REDIST_REGIONS API > > results in a different check, which already exists, at first vcpu run: > > that the number of redist regions is enough for all vcpus. > > > > Finally, this patch also enables some extra tests in > > vgic_v3_alloc_redist_region() by calculating "size" early for the legacy > > redist api: like checking that the REDIST region can fit all the already > > created vcpus. > > > > Signed-off-by: Ricardo Koller <ricarkol@xxxxxxxxxx> > > --- > > arch/arm64/kvm/vgic/vgic-mmio-v3.c | 6 ++++-- > > arch/arm64/kvm/vgic/vgic-v3.c | 4 ++++ > > 2 files changed, 8 insertions(+), 2 deletions(-) > > > > diff --git a/arch/arm64/kvm/vgic/vgic-mmio-v3.c b/arch/arm64/kvm/vgic/vgic-mmio-v3.c > > index a09cdc0b953c..9be02bf7865e 100644 > > --- a/arch/arm64/kvm/vgic/vgic-mmio-v3.c > > +++ b/arch/arm64/kvm/vgic/vgic-mmio-v3.c > > @@ -796,7 +796,9 @@ static int vgic_v3_alloc_redist_region(struct kvm *kvm, uint32_t index, > > struct vgic_dist *d = &kvm->arch.vgic; > > struct vgic_redist_region *rdreg; > > struct list_head *rd_regions = &d->rd_regions; > > - size_t size = count * KVM_VGIC_V3_REDIST_SIZE; > > + int nr_vcpus = atomic_read(&kvm->online_vcpus); > > + size_t size = count ? count * KVM_VGIC_V3_REDIST_SIZE > > + : nr_vcpus * KVM_VGIC_V3_REDIST_SIZE; > > This actually fixes the vgic_dist_overlap(kvm, base, size=0) > > in case the number of online-vcpus at that time is less than the final > one (1st run), if count=0 (legacy API) do we ever check that the RDIST > (with accumulated vcpu rdists) does not overlap with dist. > in other words shouldn't we call vgic_dist_overlap(kvm, base, size) > again in vgic_v3_check_base(). > I think we're good; that's checked by vgic_v3_rdist_overlap(dist_base) in vgic_v3_check_base(). This function uses the only region (legacy case) using a size based on the online_vcpus (in vgic_v3_rd_region_size()). This exact situation is tested by test_vgic_then_vcpus() in the vgic_init selftest. Thanks, Ricardo > Thanks > > Eric > > > int ret; > > > > /* cross the end of memory ? */ > > @@ -840,7 +842,7 @@ static int vgic_v3_alloc_redist_region(struct kvm *kvm, uint32_t index, > > > > rdreg->base = VGIC_ADDR_UNDEF; > > > > - ret = vgic_check_ioaddr(kvm, &rdreg->base, base, SZ_64K); > > + ret = vgic_check_iorange(kvm, &rdreg->base, base, SZ_64K, size); > > if (ret) > > goto free; > > > > diff --git a/arch/arm64/kvm/vgic/vgic-v3.c b/arch/arm64/kvm/vgic/vgic-v3.c > > index 21a6207fb2ee..27ee674631b3 100644 > > --- a/arch/arm64/kvm/vgic/vgic-v3.c > > +++ b/arch/arm64/kvm/vgic/vgic-v3.c > > @@ -486,6 +486,10 @@ bool vgic_v3_check_base(struct kvm *kvm) > > if (rdreg->base + vgic_v3_rd_region_size(kvm, rdreg) < > > rdreg->base) > > return false; > > + > > + if (rdreg->base + vgic_v3_rd_region_size(kvm, rdreg) > > > + kvm_phys_size(kvm)) > > + return false; > > } > > > > if (IS_VGIC_ADDR_UNDEF(d->vgic_dist_base)) >
