Xen arm32: The cache may not be properly cleaned/invalidated (marc.info)
from tedu to cloudsec on 08 Sep 2023 07:26

Arm provides multiple helpers to clean & invalidate the cache

for a given region. This is, for instance, used when allocating
guest memory to ensure any writes (such as the ones during scrubbing)
have reached memory before handing over the page to a guest.

Unfortunately, the arithmetics in the helpers can overflow and would

then result to skip the cache cleaning/invalidation. Therefore there
is no guarantee when all the writes will reach the memory.


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