[CentOS-virt] Building Xen 4.4 rpms for centos7

[Johnny Hughes]

On 01/20/2015 08:10 AM, Pasi Kärkkäinen wrote:
> Hello,
> 
> Now that the Xen 4.4.1 rpms + libvirt 1.2.10 rpms for CentOS 6 seem to be in good shape
> it would be a good time to start experimenting with el7 builds aswell.
> 
> I think it's best to start with the same set of packages we have for el6,
> and just do the minimum required changes to get them working on centos7.
> 
> That probably means fixing some dependencies in the spec file, and some changes for systemd support. 
> 
> Note that all those changes are already done in Fedora 21 Xen rpms, for example:
> ftp://ftp.funet.fi/pub/mirrors/fedora.redhat.com/pub/fedora/linux/updates/21/SRPMS/x/xen-4.4.1-12.fc21.src.rpm
> 
> A few months ago I also saw a Xen 4.4 el7 rpms port, so we could find those src.rpms aswell.
> 

Agreed on this too .. let's use as much the same as we can, and we can
use %if statements in the SPEC to differentiate el6 and el7 things, if
necessary.  systemd versus init and maybe some version number changes
for buildrequires should be the changes we need to be concerned about.

> 
> And then there's the dom0 kernel.. Stock rhel7/centos7 is based on Linux 3.10 kernel,
> so we probably can use the exact same 3.10.63 kernel we have today for CentOS 6 Xen.

I agree that we can likely use the current centos-6 kernel.  We do need
to decide when we want to shift the kernel to 3.14 .. the support for
3.10 as a LTS kernel ends in September 2015 (so 9 months).

https://www.kernel.org/category/releases.html

We can try to take the RH 3.10 el7 kernel, mod it for xen, and use it ..
or we can shift to 3.14.x and that buys us at least one more year .. or
wait until they name the next LTS kernel and go for that.  Likely the
next LTS kernel will be the easiest option (the RH modified kernel will
not support xen and rolling in stuff externally will be hard because of
the backports RH does to the kernel (things that go into a standard
kernel will not apply cleanly to the RH kernel).

But, I agree lets try to use the el6 kernel for xen el7 too .. and we
can switch both kernels as required later.

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