KVM: PPC: Book3S: Allow backing bigger guest IOMMU pages with smaller physical pages

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At the moment we only support in the host the IOMMU page sizes which
the guest is aware of, which is 4KB/64KB/16MB. However P9 does not support
16MB IOMMU pages, 2MB and 1GB pages are supported instead. We can still
emulate bigger guest pages (for example 16MB) with smaller host pages
(4KB/64KB/2MB).

This allows the physical IOMMU pages to use a page size smaller or equal
than the guest visible IOMMU page size.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

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Alexey Kardashevskiy 2018-05-14 20:00:28 +10:00 • committed by Paul Mackerras

parent c6b61661d2

commit ca1fc489cf

2 changed files with 94 additions and 20 deletions

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64

arch/powerpc/kvm/book3s_64_vio.c

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50

arch/powerpc/kvm/book3s_64_vio_hv.c

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