Re: [Qemu-discuss] Qemu-discuss Digest, Vol 78, Issue 16

[Holger Schranz]

Am 23.03.2018 um 11:03 schrieb address@hidden:
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> Today's Topics:
>
>     1. qemu-kvm and qemu-system-x86_64 (Deneau, Tom)
>     2. Re: qemu-kvm and qemu-system-x86_64 (Jakob Bohm)
>     3. Re: How do -icount flags work in QEMU TCG (Arnabjyoti Kalita)
>     4. Antw:  qemu-kvm and qemu-system-x86_64 (Steffen Wei?gerber)
>     5. Re: How do -icount flags work in QEMU TCG (Peter Maydell)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 22 Mar 2018 17:29:15 +0000
> From: "Deneau, Tom" <address@hidden>
> To: "address@hidden" <address@hidden>
> Subject: [Qemu-discuss] qemu-kvm and qemu-system-x86_64
> Message-ID:
>         <address@hidden>
>
> Content-Type: text/plain; charset="us-ascii"
>
> 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>
Yes, you can do it.
> 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?
qemu-kvm is hashed (/usr/bin/qemu-kvm)

more /usr/bin/qemu-kvm
#!/bin/sh

exec /usr/bin/qemu-system-x86_64 -machine accel=kvm "$@"
> -- Tom Deneau
>
>
>
>
> ------------------------------
>
> Message: 2
> Date: Thu, 22 Mar 2018 21:39:02 +0100
> From: Jakob Bohm <address@hidden>
> To: address@hidden
> Subject: Re: [Qemu-discuss] qemu-kvm and qemu-system-x86_64
> Message-ID: <address@hidden>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> 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


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