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KVM: arm/arm64: vgic-its: Fix restoration of unmapped collections 

commit 8c58be3449 upstream.

Saving/restoring an unmapped collection is a valid scenario. For
example this happens if a MAPTI command was sent, featuring an
unmapped collection. At the moment the CTE fails to be restored.
Only compare against the number of online vcpus if the rdist
base is set.

Fixes: ea1ad53e1e ("KVM: arm64: vgic-its: Collection table save/restore")
Signed-off-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Link: https://lore.kernel.org/r/20191213094237.19627-1-eric.auger@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Eric Auger 2019-12-13 10:42:37 +01:00 committed by Greg Kroah-Hartman
parent c406e53521
commit 199808393e
1 changed files with 2 additions and 1 deletions
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3
virt/kvm/arm/vgic/vgic-its.c
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@ -2472,7 +2472,8 @@ static int vgic_its_restore_cte(struct vgic_its *its, gpa_t gpa, int esz)
target_addr = (u32)(val >> KVM_ITS_CTE_RDBASE_SHIFT);
coll_id = val & KVM_ITS_CTE_ICID_MASK;
if (target_addr >= atomic_read(&kvm->online_vcpus))
if (target_addr != COLLECTION_NOT_MAPPED &&
target_addr >= atomic_read(&kvm->online_vcpus))
return -EINVAL;
collection = find_collection(its, coll_id);