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vfio: Fix 128 bit handling 

Upcoming VFIO on SPAPR PPC64 support will initialize the IOMMU
memory region with UINT64_MAX (2^64 bytes) size so int128_get64()
will assert.

The patch takes care of this check. The existing type1 IOMMU code
is not expected to map all 64 bits of RAM so the patch does not
touch that part.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Alexey Kardashevskiy 2014-05-30 13:02:02 -06:00 committed by Alex Williamson
parent 12e1129b80
commit 7532d3cbf1
1 changed files with 6 additions and 3 deletions
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9
hw/misc/vfio.c
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@ -2392,6 +2392,7 @@ static void vfio_listener_region_add(MemoryListener *listener,
VFIOContainer *container = container_of(listener, VFIOContainer,
iommu_data.type1.listener);
hwaddr iova, end;
Int128 llend;
void *vaddr;
int ret;
@ -2412,13 +2413,15 @@ static void vfio_listener_region_add(MemoryListener *listener,
}
iova = TARGET_PAGE_ALIGN(section->offset_within_address_space);
end = (section->offset_within_address_space + int128_get64(section->size)) &
TARGET_PAGE_MASK;
llend = int128_make64(section->offset_within_address_space);
llend = int128_add(llend, section->size);
llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK));
if (iova >= end) {
if (int128_ge(int128_make64(iova), llend)) {
return;
}
end = int128_get64(llend);
vaddr = memory_region_get_ram_ptr(section->mr) +
section->offset_within_region +
(iova - section->offset_within_address_space);