<linux-tip-comm...@vger.kernel.org> From: h...@zytor.com Message-ID: <67a3db9f-e58d-42b3-bf16-ac59d2fce...@zytor.com>
On November 8, 2017 8:34:45 AM PST, Linus Torvalds <torva...@linux-foundation.org> wrote: >On Wed, Nov 8, 2017 at 8:14 AM, Denys Vlasenko <dvlas...@redhat.com> >wrote: >> >> Can we avoid maintain emulation of these isns, by asking Wine to >remove >> their use instead? > >If we ask the Wine people to remove the instruction use, that may mean >that we can avoid the emulation in four or five _years_ once everybody >has updated. > >But it wouldn't mean that we could avoid it today. > >We *do* probably want to print a warning about these instructions, >whether emulated or not. If emulated, we want to print a warning about >the emulation being expensive (as a nudge to the Wine people to not do >that), and if _not_ emulated, we'd want to print a warning about why >people suddenly got a SIGSEGV in case there are programs that use >those instructions that people didn't even think of. > >But make it ratelimit the warning (perhaps at most once every few >minutes or whatever), so that people won't flood message logs just >because they have old stupid programs that use those things. > > Linus The real problem is that 16-bit software uses the instructions mostly for stupid reasons, but smsw in particular is used exactly because it is a virtualization hole. -- Sent from my Android device with K-9 Mail. Please excuse my brevity.
