linux-kernel - Re: [PATCH v2 00/10] virtio-mem: paravirtualized memory

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Message-ID: <6858c4d8-7570-2c2b-5d53-1a7f994c14ee@redhat.com>
Date:   Fri, 27 Mar 2020 18:03:26 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Pankaj Gupta <pankaj.gupta.linux@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        virtio-dev@...ts.oasis-open.org,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        Michal Hocko <mhocko@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Sebastien Boeuf <sebastien.boeuf@...el.com>,
        Samuel Ortiz <samuel.ortiz@...el.com>,
        Robert Bradford <robert.bradford@...el.com>,
        Luiz Capitulino <lcapitulino@...hat.com>,
        teawater <teawaterz@...ux.alibaba.com>,
        Igor Mammedov <imammedo@...hat.com>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
        Alexander Potapenko <glider@...gle.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Anthony Yznaga <anthony.yznaga@...cle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Young <dyoung@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Juergen Gross <jgross@...e.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Len Brown <lenb@...nel.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Michal Hocko <mhocko@...e.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Oscar Salvador <osalvador@...e.com>,
        Oscar Salvador <osalvador@...e.de>,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        Pavel Tatashin <pavel.tatashin@...rosoft.com>,
        Pingfan Liu <kernelfans@...il.com>, Qian Cai <cai@....pw>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Wei Yang <richard.weiyang@...il.com>
Subject: Re: [PATCH v2 00/10] virtio-mem: paravirtualized memory

On 27.03.20 17:58, Pankaj Gupta wrote:
> Hi David,
> 
> Trying to test the series with the Qemu branch(virtio-mem) mentioned.
> Unfortunately,
> not able to hotplug memory. Is anything changed from your previous posting
> or I am doing something wrong?
> 
> After giving value to "requested-size", I see size as zero.
> 
> (qemu) qom-set vm0 requested-size 10G
> (qemu) info memory-devices
> Memory device [virtio-mem]: "vm0"
>   memaddr: 0x240000000
>   node: 0
>   requested-size: 10737418240
>   size: 0
>   max-size: 107374182400
>   block-size: 2097152
>   memdev: /objects/mem0
> 
> Guest kernel: 5.6.0-rc4
> Using same Qemu commandline arguments mentioned in cover-letter.

Are you booting from an initrd? Are you compiling virtio-mem as a kernel
module or into the kernel binary?

Make sure that the virtio-mem driver will actually be loaded. (lsmod  |
grep virtio-mem).

Also, double check if there are any virtio-mem dmesg errors/warnings.

-- 
Thanks,

David / dhildenb