From: "David Hildenbrand (Arm)" <david@kernel.org>
To: Mike Rapoport <rppt@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Alexander Potapenko <glider@google.com>,
Marco Elver <elver@google.com>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Dmitry Vyukov <dvyukov@google.com>, Len Brown <lenb@kernel.org>,
Pavel Machek <pavel@kernel.org>,
kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, linux-pm@vger.kernel.org
Subject: Re: [PATCH 4/5] hibernation, KFENCE: explicitly map/unmap KFENCE pages
Date: Fri, 25 Sep 2026 13:00:30 +0200 [thread overview]
Message-ID: <d57e00ba-f34c-4d30-adcd-aed02f9a0d30@kernel.org> (raw)
In-Reply-To: <arY_058nsjb_Ie1l@kernel.org>
On 9/25/26 11:33, Mike Rapoport wrote:
> On Thu, Sep 24, 2026 at 08:49:13PM +0200, David Hildenbrand (Arm) wrote:
>> On 9/24/26 18:02, Mike Rapoport wrote:
>>>
>>> They are not necessarily in direct map :)
>>> loongarch does not have direct map, but still supports kfence
>>
>> Ugh :D
>>
>> But where are the pages mapped/unmapped then?
>
> loongarch remaps them into vmalloc address space and sets page->virtual for
> page_address() to work.
Okay, so it's really not about the direct map in the traditional sense.
kfence_map_page_if_protected()
kfence_unmap_page_if_protected()
Maybe something like that? Anyhow, pick one and let's move forward :)
--
Cheers,
David
next prev parent reply other threads:[~2026-09-25 11:00 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-17 6:07 [PATCH 0/5] hibernation: make safe_copy_page more robust and remove debug_pagealloc support Mike Rapoport (Microsoft)
2026-09-17 6:07 ` [PATCH 1/5] hibernation: make swsusp_page helpers static Mike Rapoport (Microsoft)
2026-09-23 10:08 ` David Hildenbrand (Arm)
2026-09-17 6:07 ` [PATCH 2/5] hibernation: ensure secretmem pages don't reach a snapshot Mike Rapoport (Microsoft)
2026-09-23 10:10 ` David Hildenbrand (Arm)
2026-09-23 15:38 ` Mike Rapoport
2026-09-17 6:07 ` [PATCH 3/5] hibernate: handle potential errors in hibernate_{map,unmap}_page() Mike Rapoport (Microsoft)
2026-09-23 10:13 ` David Hildenbrand (Arm)
2026-09-23 15:42 ` Mike Rapoport
2026-09-24 8:16 ` David Hildenbrand (Arm)
2026-09-17 6:07 ` [PATCH 4/5] hibernation, KFENCE: explicitly map/unmap KFENCE pages Mike Rapoport (Microsoft)
2026-09-23 10:31 ` David Hildenbrand (Arm)
2026-09-23 15:49 ` Mike Rapoport
2026-09-24 8:19 ` David Hildenbrand (Arm)
2026-09-24 16:02 ` Mike Rapoport
2026-09-24 18:49 ` David Hildenbrand (Arm)
2026-09-25 9:33 ` Mike Rapoport
2026-09-25 11:00 ` David Hildenbrand (Arm) [this message]
2026-09-17 6:07 ` [PATCH 5/5] hibernation: make hibernation unavailable when debug_pagealloc is on Mike Rapoport (Microsoft)
2026-09-23 10:24 ` David Hildenbrand (Arm)
2026-09-23 9:26 ` [PATCH 0/5] hibernation: make safe_copy_page more robust and remove debug_pagealloc support Mike Rapoport
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