On Fri, Apr 26, 2019 at 12:45:52AM +0300, Mike Rapoport wrote: > If a system call runs in isolated context, it's accesses to kernel code and > data will be verified by SCI susbsytem. > > Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxx> > --- > arch/x86/mm/fault.c | 28 ++++++++++++++++++++++++++++ > 1 file changed, 28 insertions(+) There's a distinct lack of touching do_double_fault(). It appears to me that you'll instantly trigger #DF when you #PF, because the #PF handler itself will not be able to run. And then obviously you have to be very careful to make sure #DF can, _at_all_times_ run, otherwise you'll tripple-fault and we all know what that does.
