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    SubjectRe: [PATCH v1 2/4] x86/xen: add basic KASAN support for PV kernel
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    On 09/01/2020 23:27, Boris Ostrovsky wrote:
    >
    >
    > On 1/8/20 10:20 AM, Sergey Dyasli wrote:
    >> @@ -1943,6 +1973,15 @@ void __init xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn)
    >>       if (i && i < pgd_index(__START_KERNEL_map))
    >>           init_top_pgt[i] = ((pgd_t *)xen_start_info->pt_base)[i];
    >>   +#ifdef CONFIG_KASAN
    >> +    /*
    >> +     * Copy KASAN mappings
    >> +     * ffffec0000000000 - fffffbffffffffff (=44 bits) kasan shadow memory (16TB)
    >> +     */
    >> +    for (i = 0xec0 >> 3; i < 0xfc0 >> 3; i++)
    >
    > Are you referring here to  KASAN_SHADOW_START and KASAN_SHADOW_END? If so, can you use them instead?

    Indeed, the following macros make the code neater:

    #ifdef CONFIG_KASAN
    /* Copy KASAN mappings */
    for (i = pgd_index(KASAN_SHADOW_START);
    i < pgd_index(KASAN_SHADOW_END);
    i++)
    init_top_pgt[i] = ((pgd_t *)xen_start_info->pt_base)[i];
    #endif /* ifdef CONFIG_KASAN */

    --
    Thanks,
    Sergey

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