On Mon, 14 Jan 2019, Pavel Machek wrote: > Frankly I'd not call it Meltdown, as it works only on data in the cache, > so the defense is completely different. Seems more like a l1tf > :-). Meltdown on x86 also seems to work only for data in L1D, but the pipeline could be constructed in a way that data are actually fetched into L1D before speculation gives up, which is not the case on ppc (speculation aborts on L2->L1 propagation IIRC). That's why flushing L1D on ppc is sufficient, but on x86 it's not. -- Jiri Kosina SUSE Labs
