Re: [PATCH v1 2/4] x86/xen: add basic KASAN support for PV kernel

[Boris Ostrovsky]

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?

-boris

> +		init_top_pgt[i] = ((pgd_t *)xen_start_info->pt_base)[i];
> +#endif
> +
>