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Subject: Re: [PATCH v2 00/10] virtio-mem: paravirtualized memory
From:   David Hildenbrand <david@redhat.com>
To:     Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Cc:     linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        virtio-dev@lists.oasis-open.org,
        virtualization@lists.linux-foundation.org, kvm@vger.kernel.org,
        Michal Hocko <mhocko@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        "Michael S . Tsirkin" <mst@redhat.com>,
        Sebastien Boeuf <sebastien.boeuf@intel.com>,
        Samuel Ortiz <samuel.ortiz@intel.com>,
        Robert Bradford <robert.bradford@intel.com>,
        Luiz Capitulino <lcapitulino@redhat.com>,
        teawater <teawaterz@linux.alibaba.com>,
        Igor Mammedov <imammedo@redhat.com>,
        "Dr . David Alan Gilbert" <dgilbert@redhat.com>,
        Alexander Duyck <alexander.h.duyck@linux.intel.com>,
        Alexander Potapenko <glider@google.com>,
        Anshuman Khandual <anshuman.khandual@arm.com>,
        Anthony Yznaga <anthony.yznaga@oracle.com>,
        Dan Williams <dan.j.williams@intel.com>,
        Dave Young <dyoung@redhat.com>,
        Jason Wang <jasowang@redhat.com>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Juergen Gross <jgross@suse.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        Len Brown <lenb@kernel.org>,
        Mel Gorman <mgorman@techsingularity.net>,
        Michal Hocko <mhocko@suse.com>,
        Mike Rapoport <rppt@linux.ibm.com>,
        Oscar Salvador <osalvador@suse.com>,
        Oscar Salvador <osalvador@suse.de>,
        Pavel Tatashin <pasha.tatashin@soleen.com>,
        Pavel Tatashin <pavel.tatashin@microsoft.com>,
        Pingfan Liu <kernelfans@gmail.com>, Qian Cai <cai@lca.pw>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        Stefan Hajnoczi <stefanha@redhat.com>,
        Vlastimil Babka <vbabka@suse.cz>,
        Wei Yang <richard.weiyang@gmail.com>
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Organization: Red Hat GmbH
Message-ID: <c76749c9-407b-58aa-cdbe-0aef59a02b44@redhat.com>
Date:   Fri, 27 Mar 2020 18:07:08 +0100
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On 27.03.20 18:03, David Hildenbrand wrote:
> 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).

"virtio_mem", of course :)

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


-- 
Thanks,

David / dhildenb