[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [Qemu-devel] [RFC/BUG] xen-mapcache: buggy invalidate map cache?
On Sun, Apr 9, 2017 at 11:52 PM, hrg <hrgstephen@xxxxxxxxx> wrote: > 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? Added Jun Nakajima and Alexander Graf _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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