[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [Qemu-devel] [RFC/BUG] xen-mapcache: buggy invalidate map cache?
Hi, In xen_map_cache_unlocked(), map to guest memory maybe in entry->next instead of first level entry (if map to rom other than guest memory comes first), while in xen_invalidate_map_cache(), when VM ballooned out memory, qemu did not invalidate cache entries in linked list(entry->next), so when VM balloon back in memory, gfns probably mapped to different mfns, thus if guest asks device to DMA to these GPA, qemu may DMA to stale MFNs. So I think in xen_invalidate_map_cache() linked lists should also be checked and invalidated. What’s your opinion? Is this a bug? Is my analyze correct? _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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