Hi, Xiaoyao, On Tue, Nov 03, 2020 at 08:15:27PM +0800, Xiaoyao Li wrote: > On 10/31/2020 8:27 AM, Fenghua Yu wrote: > > diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c > > index 3c70fb34028b..1c3442000972 100644 > > --- a/arch/x86/kernel/traps.c > > +++ b/arch/x86/kernel/traps.c > > @@ -953,6 +953,13 @@ static __always_inline void exc_debug_user(struct > > pt_regs *regs, > > goto out_irq; > > } > > + /* > > + * Handle bus lock. #DB for bus lock can only be triggered from > > + * userspace. > > + */ > > + if (!(dr6 & DR_BUS_LOCK)) > > it should be > > if (dr6 & DR_BUS_LOCK) > > since you keep DR6.[bit 11] reserved in this version. bit 11 of > debug_read_clear_dr6() being set to 1 means bus lock detected.
You are right. Will fix it in the next version. Thank you very much! -Fenghua
