On Sat, Aug 28, 2021 at 03:20:58PM -0700, Tony Luck wrote: > On Sat, Aug 28, 2021 at 3:12 PM Al Viro <viro@xxxxxxxxxxxxxxxxxx> wrote: > > BTW, is #MC triggered on stored to a poisoned cacheline? Existence of CLZERO > > would seem to argue against that... > > No #MC on stores. Just on loads. Note that you can't clear poison > state with a series of small writes to the cache line. But a single > 64-byte store might do it (architects didn't want to guarantee that > it would work when I asked about avx512 stores to clear poison > many years ago). Dave Jiang thinks MOVDIR64B clears poison. http://archive.lwn.net:8080/linux-kernel/157617505636.42350.1170110675242558018.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxx/
