[Fedora-xen] Enable Xen in f20 qemu? [Was: Xen 4.4 RC2 [TestDay]]

[Cole Robinson]

On 11/12/2014 12:19 PM, Bill McGonigle wrote:
> On 01/21/14 03:15, Dario Faggioli wrote:
>> While investigating, we also spotted this:
>> http://pkgs.fedoraproject.org/cgit/qemu.git/tree/qemu.spec?h=f20
>>
>> Which contains the following:
>>
>> dobuild() {
>>      ./configure \
>>          --prefix=%{_prefix} \
>>          --libdir=%{_libdir} \
>>          --sysconfdir=%{_sysconfdir} \
>>          --interp-prefix=%{_prefix}/qemu-%%M \
>>          --audio-drv-list=pa,sdl,alsa,oss \
>>          --localstatedir=%{_localstatedir} \
>>          --libexecdir=%{_libexecdir} \
>>          --disable-strip \
>>          --extra-ldflags="$extraldflags -pie -Wl,-z,relro -Wl,-z,now" \
>>          --extra-cflags="%{optflags} -fPIE -DPIE" \
>>          --enable-mixemu \
>>          --enable-trace-backend=dtrace \
>>          --disable-werror \
>>          --disable-xen \
>>          --enable-kvm \
>> ...
>>
>> which seems to suggest that xen support is disabled in Fedora's qemu
>> package. Should we ask why they do that, and investigate whether that
>> can change (and, of course, whether that is enough for us) ?
>
> This still seems to be true - I guess I've been building my own for a
> long time or using virt-preview and just now had the opportunity to
> notice that the stock f20 qemu still fails with virt-install.
>
> # virt-install --name=testvm --ram=2048 --vcpus=2 --cpuset=2-11
> --location=http://librescu/cobbler/ks_mirror/centos6-x86_64
> --os-type=linux --os-variant=rhel6 --disk
> path=/dev/zvol/storage/testvm/boot --disk
> path=/dev/zvol/storage/testvm/root --network
> bridge=br0,mac=02:00:0a:0a:0a:19 --graphics=vnc --paravirt --arch=x86_64
> --virt-type=xen
>
> yields:
>
> # tail -100 /var/log/libvirt/libxl/testvm.log  | grep
> libxl__spawn_local_dm | grep -v Spawning | cut -f 6 -d ' '| xargs echo
> /usr/bin/qemu-system-i386 -xen-domid 13 -chardev
> socket,id=libxl-cmd,path=/var/run/xen/qmp-libxl-13,server,nowait -mon
> chardev=libxl-cmd,mode=control -nodefaults -xen-attach -name testvm -vnc
> 127.0.0.1:0 -k en-us -machine xenpv -m 2049
>
> which gives:
>
>    Option xen-domid not supported for this target
>
> etc.  I see the f21 version (I built the matching version from
> virt-preview on f20) works fine and I've been using the above pattern
> for a couple years on f[1?-20].  Is it time to just enable xen for f20
> since it works and f20 will be supported for a while yet?  It was a
> little tricky (aka time-consuming) for me to track this down and I have
> a slight clue how the parts work - failing for historical reasons seems
> to be incorrect and will unnecessarily confuse a large part of the user
> base.
>

Should be fine, please file an f20 bug against qemu and I'll turn on xen in 
the next build

- Cole