linux-kernel - Re: [PATCH v2 5/7] virtio-mem: s390 support

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Message-ID: <20241014184824.10447-F-hca@linux.ibm.com>
Date: Mon, 14 Oct 2024 20:48:24 +0200
From: Heiko Carstens <hca@...ux.ibm.com>
To: David Hildenbrand <david@...hat.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-s390@...r.kernel.org, virtualization@...ts.linux.dev,
        linux-doc@...r.kernel.org, kvm@...r.kernel.org,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>, Thomas Huth <thuth@...hat.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
        Eugenio Pérez <eperezma@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jonathan Corbet <corbet@....net>, Mario Casquero <mcasquer@...hat.com>
Subject: Re: [PATCH v2 5/7] virtio-mem: s390 support

On Mon, Oct 14, 2024 at 04:46:17PM +0200, David Hildenbrand wrote:
> The special s390 kdump mode, whereby the 2nd kernel creates the ELF
> core header, won't currently dump virtio-mem memory. The virtio-mem
> driver has a special kdump mode, from where we can detect memory ranges
> to dump. Based on this, support for dumping virtio-mem memory can be
> added in the future fairly easily.

Hm.. who will add this support? This looks like a showstopper to me.
Who is supposed to debug crash dumps where memory parts are missing?