lkml.org 
[lkml]   [2019]   [Jul]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v2] xen/pv: Fix a boot up hang revealed by int3 self test
On Fri, Jul 12, 2019 at 09:04:22PM +0800, Zhenzhong Duan wrote:
>
> On 2019/7/12 20:06, Peter Zijlstra wrote:
> > On Thu, Jul 11, 2019 at 04:15:21PM +0800, Zhenzhong Duan wrote:
> > > diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
> > > index 4722ba2..2138d69 100644
> > > --- a/arch/x86/xen/enlighten_pv.c
> > > +++ b/arch/x86/xen/enlighten_pv.c
> > > @@ -596,7 +596,7 @@ struct trap_array_entry {
> > > static struct trap_array_entry trap_array[] = {
> > > { debug, xen_xendebug, true },
> > > - { int3, xen_xenint3, true },
> > > + { int3, xen_int3, true },
> > > { double_fault, xen_double_fault, true },
> > > #ifdef CONFIG_X86_MCE
> > > { machine_check, xen_machine_check, true },
> > I'm confused on the purpose of trap_array[], could you elucidate me?
>
> Used to replace trap handler addresses by Xen specific ones and sanity check
>
> if there's an unexpected IST-using fault handler.

git grep xen_int3, failed me. Where does that symbol come from?

> > The sole user seems to be get_trap_addr() and that talks about ISTs, but
> > #BP isn't an IST anymore, so why does it have ist_okay=true?
>
> Oh, yes, I missed that boolean, thanks. I'll try ist_okey=false for int3 and
> test it tomorrow.

Thanks!

\
 
 \ /
  Last update: 2019-07-12 15:11    [W:0.033 / U:7.244 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site