On Wed, Jul 8, 2015 at 12:24 PM, Andy Lutomirski <[email protected]> wrote: > The TIF_NOTIFY_RESUME hack it was using was buggy and unsupportable. > vm86 mode was completely broken under ptrace, for example, because > we'd never make it to v8086 mode. > > This code is still a huge, scary mess, but at least it's no longer > tangled with the exit-to-userspace loop.
This patch is incorrect. Brian, what's the ETA for your vm86 cleanup? If it's very soon, then I'll see if I can rely on it. If not, I'll have to come up with a way to fix this patch. Grr. The kernel state when handle_vm86_trap is called is absurd right now. Somehow we're supposed to survive do_trap, send a signal corresponding to the outside-vm86 state, and exit vm86 cleanly (with ax = 0), all before returning to user mode. I doubt these semantics are even intentional. This code sucks. --Andy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
