Re: [PATCH 00/10] Introduce virtio-mem model

[Michal Privoznik]

On 2/4/21 3:33 AM, Jing Qi wrote:
Michal,
I checked the virtio_mem module and it's loaded -
lsmod |grep virtio_mem
virtio_mem             32768  0

And I can't make the actual value change to non-zerio.
->  virsh update-memory pc  --requested-size 256M
or
->virsh setmem pc 1000M

This is unrelated. 'setmem' modifies balloon not virtio-mem-pci device.


  <memory model='virtio-mem'>
       <target>
         <size unit='KiB'>524288</size>
         <node>0</node>
         <block unit='KiB'>2048</block>
         <requested unit='KiB'>262144</requested>
         <actual unit='KiB'>0</actual>
       </target>
       <alias name='virtiomem0'/>
       <address type='pci' domain='0x0000' bus='0x00' slot='0x0a'
function='0x0'/>
     </memory>
Any other suggestions ?


Is there something in the guest dmesg? This is what I get:

virsh update-memory-device gentoo --alias ua-virtiomem 256M

[   17.619060] virtio_mem virtio3: plugged size: 0x0
[   17.619062] virtio_mem virtio3: requested size: 0x10000000
[   17.653072] Built 4 zonelists, mobility grouping on.  Total pages: 
2065850
[   17.653074] Policy zone: Normal


And I can see actual size updated:

    <memory model='virtio-mem'>
      <source>
        <pagesize unit='KiB'>2048</pagesize>
      </source>
      <target>
        <size unit='KiB'>4194304</size>
        <node>0</node>
        <block unit='KiB'>2048</block>
        <requested unit='KiB'>262144</requested>
        <actual unit='KiB'>262144</actual>
      </target>
      <alias name='ua-virtiomem'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x08' 
function='0x0'/>
    </memory>

Maybe David knows the answer.

Michal