Re: [Qemu-discuss] qemu-kvm and qemu-system-x86_64

[Jakob Bohm]

On 22/03/2018 18:29, Deneau, Tom wrote:
> My situation: I want to run a KVM-accelerated qemu but I want to build 
> everything involved from the latest sources and use those instead of any 
> downloadable distro packages.  (This is on SLES12-SP3 although I don't think 
> the distro matters).
>
> I am able to build and install from
>     * http://github.com/qemu/qemu using  ../configure 
> --target-list=x86_64-softmmu --enable-kvm --prefix=/usr --sysconfdir=/etc
>     * http://github.com/libvirt/libvirt  using ./configure --prefix=/usr 
> --sysconfdir=/etc --localstatedir=/var
>
> Before running make install,  I also removed the existing distro packages like 
> libvirt, libvirt-client, qemu-kvm, etc.
>
> My  question:  In the installed distro packages there was an executable, 
> /usr/libexec/qemu-kvm
> But after building and installing qemu from sources as above, I did not see any 
> new qemu-kvm.
> Is there some other repository I need to build from to get qemu-kvm?
>
> I ask because I am starting vms using virsh define xyz.xml; virsh start xyz.  
> And in the original .xml files I had the following under devices:
>         <emulator>/usr/libexec/qemu-kvm</emulator>
>
> Can I replace that with
>     <emulator>/usr/local/bin/qemu-system-x86_64</emulator>
>
> And given that I am already using
>      <os>
>          <type>hvm</type>
>          <boot dev="hd"></boot>
>      </os>
>
> Will I get the same KVM acceleration as I was previously getting by using 
> qemu-kvm?
>
> -- Tom Deneau
For many years now, qemu-kvm has been a small shell script that prefixes
"--enable-kvm" to the other arguments.

Something like (guessing since its no longer on my system):

#!/bin/sh
exec qemu-system-x86_64 --enable-kvm "$@"

It was only a real program before kvm support was merged into standard
qemu.

Enjoy

Jakob
--
Jakob Bohm, CIO, Partner, WiseMo A/S.  https://www.wisemo.com
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