I've not gotten any bites from my posting on the xen-devel mailing list. Here is the only one to-date:
https://lists.xen.org/archives/html/xen-devel/2017-04/msg01069.html

From that email, there needs to be some hypervisor messages.

Does anyone know how to produce the hypervisor messages? I've already removed the rhgb and quiet options from the boot.

Thanks
PJ

On Thu, Apr 6, 2017 at 11:21 PM, Sarah Newman <srn@prgmr.com> wrote:
On 03/28/2017 02:55 PM, PJ Welsh wrote:
> The mystery gets more interesting... I now have a CentOS 7.3 Dell R710
> server doing the exact same thing of rebooting immediately after the Xen
> kernel load. Just to note this is a second system and not just the first
> system with an update. I hope I'm not introducing something odd. They only
> "interesting" thing I have done for historical reasons is to change the
> following /etc/sysconfig/grub line:
> GRUB_CMDLINE_XEN_DEFAULT="dom0_mem=6G,max:8G cpuinfo com1=115200,8n1
> console=com1,tty loglvl=all guest_loglvl=all"
> But I've done that on other servers without issue. In fact I have a Dell
> R710 that DOES work with CentOS 7 and the new kernel... so confused.

I am having no similar issues with several Dell Proliant DL160p's and CentOS 6.
They are either G5 or G6, I don't recall which.

--Sarah

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