[RFC PATCH 03/12] lib: sbi_hart: enforce riscv,pmwid for Worlds ISA

[Yu-Chien Peter Lin]

On Mon, Jul 13, 2026 at 02:26:13PM -0700, Pawandeep Oza wrote:
> On Fri, Jun 26, 2026 at 3:16 AM Yu-Chien Peter Lin <peter.lin at sifive.com> wrote:
> >
> > When Smwid/Smlwid extensions are detected during hart ISA detection,
> > the riscv,pmwid device tree property is required to specify the M-mode
> > WID default value.
> >
> > Signed-off-by: Yu-Chien Peter Lin <peter.lin at sifive.com>
> > ---
> >  lib/sbi/sbi_hart.c | 13 +++++++++++++
> >  1 file changed, 13 insertions(+)
> >
> > diff --git a/lib/sbi/sbi_hart.c b/lib/sbi/sbi_hart.c
> > index 0c584bfc..cb0c66ea 100644
> > --- a/lib/sbi/sbi_hart.c
> > +++ b/lib/sbi/sbi_hart.c
> > @@ -768,6 +768,19 @@ skip_smwiddeleg:
> >         /* Mark hart feature detection done */
> >         hfeatures->detected = true;
> >
> > +       /*
> > +        * Validate M-mode WID default value: if Worlds ISA extensions
> > +        * are present, riscv,pmwid must exist in DT.
> > +        */
> > +       if ((sbi_hart_has_extension(scratch, SBI_HART_EXT_SMWID) ||
> > +            sbi_hart_has_extension(scratch, SBI_HART_EXT_SMLWID)) &&
> > +            !hfeatures->has_pmwid) {
> > +               sbi_printf("WARNING: hart%u has Worlds ISA extension but DT "
> :%s/WARNING/ERROR/gc as this is causing panic/hang

Yes, makes sense.

> > +                          "lacks riscv,pmwid.\n",
> > +                          current_hartid());
> > +               return SBI_EINVAL;
> > +       }
> > +
> >         /*
> >          * On platforms with Smepmp, the previous booting stage must
> >          * enter OpenSBI with mseccfg.MML == 0. This allows OpenSBI
> > --
> > 2.43.7
> >
> >
> > --
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