Re: [patch V4 part 4 08/24] x86/entry: Provide IDTENTRY_IST

[Andy Lutomirski]

On Tue, May 5, 2020 at 7:16 AM Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote:
>
> Same as IDTENTRY but for exceptions which run on Interrupt STacks (IST) on
> 64bit. For 32bit this maps to IDTENTRY.
>
> There are 3 variants which will be used:
>       IDTENTRY_MCE
>       IDTENTRY_DB
>       IDTENTRY_NMI
>
> These map to IDTENTRY_IST, but only the MCE and DB variants are emitting
> ASM code as the NMI entry needs hand crafted ASM still.
>
> The function defines do not contain any idtenter/exit calls as these
> exceptions need special treatment.

Okay I guess, but in the long run I'm guessing that we'll want to
merge a bunch of this to DECLARE_IDTENTRY_NOASM and just manually emit
the special cases in entry_32/64.S.

Acked-by: Andy Lutomirski <luto@xxxxxxxxxx>