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Re: [PATCH v2 2/3] mm/memory_hotplug: Introduce MHP_NO_FIRMWARE_MEMMAP
- To: David Hildenbrand <david@xxxxxxxxxx>, "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
- From: Dave Hansen <dave.hansen@xxxxxxxxx>
- Date: Thu, 30 Apr 2020 09:04:23 -0700
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- Cc: virtio-dev@xxxxxxxxxxxxxxxxxxxx, linux-hyperv@xxxxxxxxxxxxxxx, Michal Hocko <mhocko@xxxxxxxx>, Baoquan He <bhe@xxxxxxxxxx>, linux-mm@xxxxxxxxx, Wei Yang <richard.weiyang@xxxxxxxxx>, linux-s390@xxxxxxxxxxxxxxx, linux-nvdimm@xxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx, linux-acpi@xxxxxxxxxxxxxxx, "Michael S . Tsirkin" <mst@xxxxxxxxxx>, Pankaj Gupta <pankaj.gupta.linux@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Michal Hocko <mhocko@xxxxxxxxxx>, linuxppc-dev@xxxxxxxxxxxxxxxx
- Delivery-date: Thu, 30 Apr 2020 16:04:38 +0000
- Ironport-sdr: yo7pSQEgU0LGPBYnDFSgyrGketN3+mxjxFa8IAI25IiR7aXgZln7ulV1AE0eQu7lbSG9bDAT53 ivS7HrF1zD9w==
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 4/30/20 8:52 AM, David Hildenbrand wrote:
>> Justifying behavior by documentation that does not consider memory
>> hotplug is bad thinking.
> Are you maybe confusing this patch series with the arm64 approach? This
> is not about ordinary hotplugged DIMMs.
>
> I'd love to get Dan's, Dave's and Michal's opinion.
The impact on kexec from the DAX "kmem" driver's use of hotplug was
inadvertent and unfortunate.
The problem statement and solution seem pretty sane to me.
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