Hey Will, On Thu, Jun 08, 2023 at 06:21:13PM +0100, Will Deacon wrote: > > IIRC, Colton was testing largely with permission relaxation, and had > > forward progress issues b.c. the stale TLB entry was never invalidated > > in response to a permission fault. > > Would the series at: > > https://lore.kernel.org/r/5d8e1f752051173d2d1b5c3e14b54eb3506ed3ef.1684892404.git-series.apopple@xxxxxxxxxx > > help with that? Heh, that's a rather interesting patch :) I don't think it is directly related to the problem Colton encounters, though the symptoms are similar. This crops up when KVM uses a stricter permission set than the primary MMU, like lazy X for deferred I$ maintenance and write-protection for dirty logging. KVM policy led to the stale TLB entry, so KVM is the one that needs to initiate the invalidation. -- Thanks, Oliver
