memory: add address_space_access_valid

The old-style IOMMU lets you check whether an access is valid in a
given DMAContext.  There is no equivalent for AddressSpace in the
memory API, implement it with a lookup of the dispatch tree.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/sysemu/dma.h b/include/sysemu/dma.h
index a52c93a..02e0dcd 100644
--- a/include/sysemu/dma.h
+++ b/include/sysemu/dma.h
@@ -113,7 +113,8 @@ static inline bool dma_memory_valid(DMAContext *dma,
                                     DMADirection dir)
 {
     if (!dma_has_iommu(dma)) {
-        return true;
+        return address_space_access_valid(dma->as, addr, len,
+                                          dir == DMA_DIRECTION_FROM_DEVICE);
     } else {
         return iommu_dma_memory_valid(dma, addr, len, dir);
     }