On Fri, May 29, 2020 at 07:05:54AM +0800, Lai Jiangshan wrote: > On Fri, May 29, 2020 at 6:48 AM Peter Zijlstra <pet...@infradead.org> wrote: > > > > On Fri, May 29, 2020 at 06:42:46AM +0800, Lai Jiangshan wrote: > > > On Fri, May 29, 2020 at 4:25 AM Peter Zijlstra <pet...@infradead.org> > > > wrote: > > > > > > > > These patches disallow #DB during NMI/#MC and allow removing a lot of > > > > fugly code. > > > > > > > > > > Hello > > > > > > Will #DB be allowed in #DF? > > > > No, that whole thing is noinstr. > > But it calls many functions, including die(), panic(). > We don't want #DB to interfere how it die() and panic(). > Since it is in fragile #DF, the #DB may mess it up and > make #DF fails to report and die.
The only recoverable #DF is the ESPFIX shit. If we do not take that, we're on the way to panic(), I really can't be arsed if you crash the box before that, we're going to die anyway.
