linux-kernel - Re: [PATCH v2 1/6] riscv: Split early and final KASAN population functions

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Date:   Tue, 24 Jan 2023 09:00:25 +0100
From:   Alexandre Ghiti <alexghiti@...osinc.com>
To:     Conor Dooley <conor@...nel.org>
Cc:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kasan-dev@...glegroups.com, linux-efi@...r.kernel.org
Subject: Re: [PATCH v2 1/6] riscv: Split early and final KASAN population functions

Hi Conor,

On Mon, Jan 23, 2023 at 11:15 PM Conor Dooley <conor@...nel.org> wrote:
>
> Hey Alex,
>
> FYI this patch has a couple places with spaces used rather than tabs for
> indent.

Damn, I forgot to run checkpatch this time...

Thanks,

Alex

>
> >  static void __init kasan_populate_p4d(pgd_t *pgd,
> > -                                   unsigned long vaddr, unsigned long end,
> > -                                   bool early)
> > +                                   unsigned long vaddr, unsigned long end)
> >  {
> >       phys_addr_t phys_addr;
> >       p4d_t *p4dp, *base_p4d;
> >       unsigned long next;
> >
> > -     if (early) {
> > -             /*
> > -              * We can't use pgd_page_vaddr here as it would return a linear
> > -              * mapping address but it is not mapped yet, but when populating
> > -              * early_pg_dir, we need the physical address and when populating
> > -              * swapper_pg_dir, we need the kernel virtual address so use
> > -              * pt_ops facility.
> > -              */
> > -             base_p4d = pt_ops.get_p4d_virt(pfn_to_phys(_pgd_pfn(*pgd)));
> > -     } else {
> > -             base_p4d = (p4d_t *)pgd_page_vaddr(*pgd);
> > -             if (base_p4d == lm_alias(kasan_early_shadow_p4d)) {
> > -                     base_p4d = memblock_alloc(PTRS_PER_PUD * sizeof(p4d_t), PAGE_SIZE);
> > -                     memcpy(base_p4d, (void *)kasan_early_shadow_p4d,
> > -                             sizeof(p4d_t) * PTRS_PER_P4D);
> > -             }
> > -     }
> > +     base_p4d = (p4d_t *)pgd_page_vaddr(*pgd);
> > +     if (base_p4d == lm_alias(kasan_early_shadow_p4d)) {
> > +             base_p4d = memblock_alloc(PTRS_PER_PUD * sizeof(p4d_t), PAGE_SIZE);
> > +        memcpy(base_p4d, (void *)kasan_early_shadow_p4d,
> > +                sizeof(p4d_t) * PTRS_PER_P4D);
> > +    }
>
> ^^  here.
>
> Thanks,
> Conor.
>