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Re: [Xen-devel] [PATCH v1 2/4] x86/xen: add basic KASAN support for PV kernel
- To: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxx>, <kasan-dev@xxxxxxxxxxxxxxxx>, <linux-mm@xxxxxxxxx>, <linux-kernel@xxxxxxxxxxxxxxx>
- From: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
- Date: Fri, 10 Jan 2020 11:46:45 +0000
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- Cc: Juergen Gross <jgross@xxxxxxxx>, "sergey.dyasli@xxxxxxxxxx >> Sergey Dyasli" <sergey.dyasli@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>, Alexander Potapenko <glider@xxxxxxxxxx>, Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Dmitry Vyukov <dvyukov@xxxxxxxxxx>
- Delivery-date: Fri, 10 Jan 2020 11:46:58 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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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