[Xen-devel] boot message "xen:manage: Unable to read sysrq code in control/sysrq" ?

[PGNet Dev <pgnet.dev@xxxxxxxxx>]

Working with Xen 4.9.0 host on kernel 4.11.3

        dmesg | egrep -i "linux version|xen version"
                [    0.000000] Linux version 4.11.3-2.g7262353-default 
(geeko@buildhost) (gcc version 7.1.1 20170517 [gcc-7-branch revision 248152] 
(SUSE Linux) ) #1 SMP PREEMPT Thu May 25 17:55:04 UTC 2017 (7262353)
                [    0.000000] Xen version: 4.9.0_07-503 (preserve-AD)

I currently see in host boot

        dmesg | grep sysrq
                [   20.905146] xen:manage: Unable to read sysrq code in 
control/sysrq

That seems to originate at

        https://lkml.org/lkml/2016/11/8/134
                ...
        +       if (xenbus_scanf(xbt, "control", "sysrq", "%c", &sysrq_key) < 
0) {
                        pr_err("Unable to read sysrq code in control/sysrq\n");
                        xenbus_transaction_end(xbt, 1);
                        return;
                ...

Is this a config issue -- wrong or missing -- on my end?  Or a problem that 
needs some more diagnostic info here?

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