Date: Tue, 03 Mar 2015 17:03:08 -0700 From: Scott Furry <scott.wl.furry@gmail.com> To: freebsd-ports@freebsd.org Subject: qemu-devel usage Message-ID: <54F64BBC.4060502@gmail.com>
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Yeah! I was able to setup qemu-devel(ver 2.20) to use existing qcow2
images from linux. Sort of...
The biggest pain I had was getting networking to play along. No matter
what settings, modules or otherwise I tried, I could not get the VM
image to use an existing tap interface accepting DHCP from my server.
Turns out the problem was rather undocumented and buried in installed files.
The files "/usr/local/etc/qemu-if[up|down]" are two lines each. One is
the sh-bang, the other is a line saying "exec true". And this is the
default installed to the system by the port files. The
qemu-ifXXXX.sample files are not much help either as they contain the
exact same content. Link(1)(see refs below) makes no mention of the
default ifup|down script files. Would it be prudent to setup an
/etc/qemu folder so users can place their local networking scripts
there? Is this the correct location?
FWIW, my solution was to "edit" the scripts. I replaced the "exec true"
in qemu-ifup with "/sbin/ifconfig bridge0 addm ${1} up" to add a tap to
the existing bridge. In the qemu-ifdown, "exec true" was replaced with
"/sbin/ifconfig ${1} destroy". End result - still need root access to
start VM because of networking.
I didn't have to go to this extreme when I setup qemu networking on a
linux box. However, new OS. :)
From my original setup files for qemu, I had used the -enable-kvm and
-cpu host flags (see 2 below). Qemu on BSD just didn't want to accept
"host" as a cpu option. The reference did point out how the flag worked,
something I didn't realize. However, it would be really good to have the
"host" flag to pass along the cpu accelerators to the VM without having
to call them individually. Is anyone working on this?
And on the topic of cpu's, when I get a listing of the supported cpu's (
qemu -cpu help ), it seems the listing is abbreviated. There is no
mention of later cpu types (either intel or AMD). Am I missing something?
Ref (3) talks about using kqemu-kmod. A kqemu-kmod-devel exists in the
ports tree. However, I saw a reference on the KVM page (which I can't
find again :< ) talking about how kvm aspects including kqemu were being
absorbed into qemu mainline. Can someone clarify, please. Are there any
kernel modules required for normal usage? Documentation seems a little
sparse for FreeBSD/qemu hosts. Is the -enable-kvm flag mentioned earlier
still required here?
Appreciated!!!
(1) https://wiki.freebsd.org/qemu
(2) http://www.linux-kvm.org/page/Tuning_KVM
(3) http://www.linux-kvm.org/page/BSD
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