Re: [patch V4 part 4 15/24] x86/db: Split out dr6/7 handling

[Andy Lutomirski]

On Tue, May 5, 2020 at 7:16 AM Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote:
>
> From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
>
> DR6/7 should be handled before nmi_enter() is invoked and restore after
> nmi_exit() to minimize the exposure.
>
> Split it out into helper inlines and bring it into the correct order.

> +        *
> +        * Entry text is excluded for HW_BP_X and cpu_entry_area, which
> +        * includes the entry stack is excluded for everything.
> +        */
> +       get_debugreg(*dr7, 6);
> +       set_debugreg(0, 7);

Fortunately, PeterZ is hiding in a brown paper bag, so I don't have to
comment :)

Other than that:

Acked-by: Andy Lutomirski <luto@xxxxxxxxxx>