On 12/05/2017 02:05 PM, Peter Zijlstra wrote: >> I haven't checked that hard which patch introduces this bug, but it >> seems that, with this applied, nothing propagates >> non-mm-switch-related flushes to usermode. Shouldn't >> flush_tlb_func_common() contain a call to invalidate_user_asid() near >> the bottom? Alternatively, it could be in local_flush_tlb() and >> __flush_tlb_single() (or whatever the hell the flush-one-usermode-TLB >> function ends up being called). > __native_flush_tlb_single() has the invalidate_user_asid() > __native_flush_tlb() has the invalidate_user_asid(). > > Which should be exactly that last option you mention.
I can also see INVPCIDs in profiles, so it's definitely getting used.
