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memory: add address_space_access_valid

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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>
This commit is contained in:
Paolo Bonzini 2013-04-11 15:40:59 +02:00
parent c353e4cc08
commit 51644ab70b
4 changed files with 43 additions and 1 deletions
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15
include/exec/memory.h
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@ -866,6 +866,21 @@ MemoryRegionSection *address_space_translate(AddressSpace *as, hwaddr addr,
hwaddr *xlat, hwaddr *len,
bool is_write);
/* address_space_access_valid: check for validity of accessing an address
* space range
*
* Check whether memory is assigned to the given address space range.
*
* For now, addr and len should be aligned to a page size. This limitation
* will be lifted in the future.
*
* @as: #AddressSpace to be accessed
* @addr: address within that address space
* @len: length of the area to be checked
* @is_write: indicates the transfer direction
*/
bool address_space_access_valid(AddressSpace *as, hwaddr addr, int len, bool is_write);
/* address_space_map: map a physical memory region into a host virtual address
*
* May map a subset of the requested range, given by and returned in @plen.