linux-kernel - Re: [PATCH v1] virtio-mem: add memory via add_memory_driver

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Message-ID: <aed44d47-2995-555d-834f-20a919132bee@redhat.com>
Date:   Thu, 11 Jun 2020 12:57:25 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Pankaj Gupta <pankaj.gupta.linux@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, Linux MM <linux-mm@...ck.org>,
        virtio-dev@...ts.oasis-open.org,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        teawater <teawaterz@...ux.alibaba.com>
Subject: Re: [PATCH v1] virtio-mem: add memory via add_memory_driver_managed()

On 11.06.20 12:32, Pankaj Gupta wrote:
>> Virtio-mem managed memory is always detected and added by the virtio-mem
>> driver, never using something like the firmware-provided memory map.
>> This is the case after an ordinary system reboot, and has to be guaranteed
>> after kexec. Especially, virtio-mem added memory resources can contain
>> inaccessible parts ("unblocked memory blocks"), blindly forwarding them
>> to a kexec kernel is dangerous, as unplugged memory will get accessed
>> (esp. written).
>>
>> Let's use the new way of adding special driver-managed memory introduced
>> in commit 75ac4c58bc0d ("mm/memory_hotplug: introduce
>> add_memory_driver_managed()").
> 
> Is this commit id correct?

Good point, it's the one from next-20200605.

7b7b27214bba

Is the correct one.

[...]

> 
> Looks good to me.
> Reviewed-by: Pankaj Gupta <pankaj.gupta.linux@...il.com>
> 

Thanks!

-- 
Thanks,

David / dhildenb