powerpc/mm_iommu: Allow pinning large regions

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When called with vmas_arg==NULL, get_user_pages_longterm() allocates
an array of nr_pages*8 which can easily get greater that the max order,
for example, registering memory for a 256GB guest does this and fails
in __alloc_pages_nodemask().

This adds a loop over chunks of entries to fit the max order limit.

Fixes: 678e174c4c ("powerpc/mm/iommu: allow migration of cma allocated pages during mm_iommu_do_alloc", 2019-03-05)
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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Alexey Kardashevskiy 2019-04-03 15:12:33 +11:00 • committed by Michael Ellerman

parent eb9d7a62c3

commit 7a3a4d7638

1 changed files with 20 additions and 4 deletions

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arch/powerpc/mm/mmu_context_iommu.c

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