intel_iommu: add "caching-mode" option
This capability asks the guest to invalidate cache before each map operation. We can use this invalidation to trap map operations in the hypervisor. Signed-off-by: NAviv Ben-David <bd.aviv@gmail.com> [peterx: using "caching-mode" instead of "cache-mode" to align with spec] [peterx: re-write the subject to make it short and clear] Reviewed-by: NJason Wang <jasowang@redhat.com> Signed-off-by: NPeter Xu <peterx@redhat.com> Signed-off-by: NAviv Ben-David <bd.aviv@gmail.com> Reviewed-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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