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exec: clamp accesses against the MemoryRegionSection 

Because the clamping was done against the MemoryRegion,
address_space_rw was effectively broken if a write spanned
multiple sections that are not linear in underlying memory
(with the memory not being under an IOMMU).

This is visible with the MIPS rc4030 IOMMU, which is implemented
as a series of alias memory regions that point to the actual RAM.

Tested-by: Hervé Poussineau <hpoussin@reactos.org>
Tested-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2015-06-17 10:36:54 +02:00
parent 965eb2fcdf
commit e4a511f8cc
1 changed files with 1 additions and 1 deletions
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exec.c
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@ -353,7 +353,7 @@ address_space_translate_internal(AddressSpaceDispatch *d, hwaddr addr, hwaddr *x
mr = section->mr;
if (memory_region_is_ram(mr)) {
diff = int128_sub(mr->size, int128_make64(addr));
diff = int128_sub(section->size, int128_make64(addr));
*plen = int128_get64(int128_min(diff, int128_make64(*plen)));
}
return section;