powerpc/kvm: Switch kvm pmd allocator to custom allocator
In the next set of patches, we will switch pmd allocator to use page fragments and the locking will be updated to split pmd ptlock. We want to avoid using fragments for partition-scoped table. Use slab cache similar to level 4 table Signed-off-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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