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Re: [PATCH v2 3/3] device-dax: Add system ram (add_memory()) with MHP_NO_FIRMWARE_MEMMAP


  • To: Dave Hansen <dave.hansen@xxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx
  • From: David Hildenbrand <david@xxxxxxxxxx>
  • Date: Thu, 30 Apr 2020 17:28:29 +0200
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  • Cc: virtio-dev@xxxxxxxxxxxxxxxxxxxx, linux-hyperv@xxxxxxxxxxxxxxx, Michal Hocko <mhocko@xxxxxxxx>, linux-acpi@xxxxxxxxxxxxxxx, Baoquan He <bhe@xxxxxxxxxx>, linux-nvdimm@xxxxxxxxxxxx, linux-s390@xxxxxxxxxxxxxxx, "Michael S . Tsirkin" <mst@xxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, Wei Yang <richard.weiyang@xxxxxxxxx>, Eric Biederman <ebiederm@xxxxxxxxxxxx>, Pankaj Gupta <pankaj.gupta.linux@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Michal Hocko <mhocko@xxxxxxxxxx>, linuxppc-dev@xxxxxxxxxxxxxxxx, Dan Williams <dan.j.williams@xxxxxxxxx>, Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
  • Delivery-date: Thu, 30 Apr 2020 15:28:56 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 30.04.20 13:23, Dave Hansen wrote:
> On 4/30/20 3:29 AM, David Hildenbrand wrote:
>> Currently, when adding memory, we create entries in /sys/firmware/memmap/
>> as "System RAM". This does not reflect the reality and will lead to
>> kexec-tools to add that memory to the fixed-up initial memmap for a
>> kexec kernel (loaded via kexec_load()). The memory will be considered
>> initial System RAM by the kexec kernel.
>>
>> We should let the kexec kernel decide how to use that memory - just as
>> we do during an ordinary reboot.
> ...
>> -    rc = add_memory(numa_node, new_res->start, resource_size(new_res), 0);
>> +    rc = add_memory(numa_node, new_res->start, resource_size(new_res),
>> +                    MHP_NO_FIRMWARE_MEMMAP);
> 
> Looks fine.  But, if you send another revision, could you add a comment
> about the actual goal of MHP_NO_FIRMWARE_MEMMAP?  Maybe:
> 
>       /*
>        * MHP_NO_FIRMWARE_MEMMAP ensures that future
>        * kexec'd kernels will not treat this as RAM.
>        */
> 
> Not a biggie, though.

Sure, maybe Andrew can fixup when applying (if no resend is necessary).

Thanks Dave!

> 
> Acked-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
> 


-- 
Thanks,

David / dhildenb




 


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