linux-kernel - Re: [PATCH v5 0/5] kdump: crashkernel reservation from CMA

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Message-ID: <26ae6b04-3beb-47e9-9639-b081003dc9bb@redhat.com>
Date: Mon, 6 Oct 2025 10:16:26 +0200
From: David Hildenbrand <dhildenb@...hat.com>
To: Breno Leitao <leitao@...ian.org>, Jiri Bohac <jbohac@...e.cz>
Cc: riel@...riel.com, vbabka@...e.cz, nphamcs@...il.com,
 Baoquan He <bhe@...hat.com>, Vivek Goyal <vgoyal@...hat.com>,
 Dave Young <dyoung@...hat.com>, kexec@...ts.infradead.org,
 akpm@...ux-foundation.org, Philipp Rudo <prudo@...hat.com>,
 Donald Dutile <ddutile@...hat.com>, Pingfan Liu <piliu@...hat.com>,
 Tao Liu <ltao@...hat.com>, linux-kernel@...r.kernel.org,
 Michal Hocko <mhocko@...e.cz>
Subject: Re: [PATCH v5 0/5] kdump: crashkernel reservation from CMA

On 03.10.25 17:51, Breno Leitao wrote:
> Hello Jiri,
> 
> On Thu, Jun 12, 2025 at 12:11:19PM +0200, Jiri Bohac wrote:
> 
>> Currently this is only the case for memory ballooning and zswap. Such movable
>> memory will be missing from the vmcore. User data is typically not dumped by
>> makedumpfile.
> 
> For zswap and zsmalloc pages, I'm wondering whether these pages will be missing
> from the vmcore, or if there's a possibility they might be present but
> corrupted—especially since they could reside in the CMA region, which may be
> overwritten by the kdump environment.

That's not different to ordinary user pages residing on these areas, right?

-- 
Cheers

David / dhildenb