Re: [Xen-devel] [PATCH v2] xen/pv: Fix a boot up hang revealed by int3 self test

[Peter Zijlstra <peterz@xxxxxxxxxxxxx>]

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?

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?

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