libvirt users - Mar 2021 - virsh capabilities does not include qemu

Hi,
I am new  to Libvirt and Qemu.I have installed Libvirt 7.1.0 and qemu-kvm
4.2.0.
I configured and built libvirt based on instructions from
https://libvirt.org/compiling.html.
But when i tried to create a VM using virsh it shows the following error:
# virsh create /home/abc.xml
error: Failed to create domain from /home/abc.xml
error: invalid argument: could not find capabilities for arch=x86_64
domaintype=kvm

When i check the hypervisor capabilities ,it doest show qemu in guest
domain type.
# virsh capabilities
....................................
.....................................
 </host>

  <guest>
    <os_type>exe</os_type>
    <arch name='x86_64'>
      <wordsize>64</wordsize>
      <emulator>/usr/local/libexec/libvirt_lxc</emulator>
      <domain type='lxc'/>
    </arch>
  </guest>

  <guest>
    <os_type>exe</os_type>
    <arch name='i686'>
      <wordsize>32</wordsize>
      <emulator>/usr/local/libexec/libvirt_lxc</emulator>
      <domain type='lxc'/>
    </arch>
  </guest>

</capabilities>

I have restarted libvirt to get the qemu support,but  it is not shown in
capabilities list.What will be the problem?
Thanks for the help in advance....
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On 3/22/21 5:17 AM, shafnamol N wrote:
> Hi,
> I am new? to Libvirt and Qemu.I have installed Libvirt 7.1.0 and 
> qemu-kvm 4.2.0.
> I configured and built libvirt based on instructions from
> https://libvirt.org/compiling.html
<https://libvirt.org/compiling.html>.
> But when i tried to create a VM using virsh it shows the following error:
> # virsh create /home/abc.xml
> error: Failed to create domain from /home/abc.xml
> error: invalid argument: could not find capabilities for arch=x86_64 
> domaintype=kvm
> 
> When i check the hypervisor capabilities ,it doest show qemu in guest 
> domain type.
> # virsh capabilities
> ....................................
> .....................................
>  ?</host>
> 
>  ? <guest>
>  ? ? <os_type>exe</os_type>
>  ? ? <arch name='x86_64'>
>  ? ? ? <wordsize>64</wordsize>
>  ? ? ? <emulator>/usr/local/libexec/libvirt_lxc</emulator>
>  ? ? ? <domain type='lxc'/>
>  ? ? </arch>
>  ? </guest>
> 
>  ? <guest>
>  ? ? <os_type>exe</os_type>
>  ? ? <arch name='i686'>
>  ? ? ? <wordsize>32</wordsize>
>  ? ? ? <emulator>/usr/local/libexec/libvirt_lxc</emulator>
This smells suspicious. Perhaps you did not pass proper prefix (meson 
-Dsystem=true)?

Anyway, libvirt tries to find qemu-system-$arch in $PATH and falls back 
to /usr/libexec/qemu-kvm if no binary was found. So I suspect that maybe 
the directory you installed QEMU into is not in $PATH?

Michal