xl mem-set for domain 0 regression

[James Dingwall <james-xen@dingwall.me.uk>]

Hi,

We are migrating from xen 4.4 to xen 4.8.  At the moment we boot our 
system with a xen command line that includes 
"dom0_mem=8192m,min:1728m,max:8192m".  We have autoballoon of dom0 
disabled in xl.conf and instead call xl mem-set 0 <memory_size> to 
change the dom0 memory allocation.  (We shrink before starting guest 
domains and then increase it when all are stopped.)

In xen 4.8.2 the xl mem-set command fails with this error:

# xl mem-set 0 3990
libxl: error: libxl.c:4196:libxl_set_memory_target: unable to retrieve 
domain configuration: No such file or directory
cannot set domid 0 dynamic max memory to : 3990

I think it was the following commit that made it necessary to access the 
configuration file but perhaps for the case domid == 0 this should be 
skipped?  If it is that simple I could try a patch which includes that 
test.

commit 38cd0664a6bf1c3b887992ea029d2bb516f52c59
Author: Shannon Zhao <shannon.zhao@linaro.org>
Date:   Wed Sep 28 18:19:02 2016 -0700

     libxl/arm: Add the size of ACPI tables to maxmem

     Here it adds the ACPI tables size to set the target maxmem to avoid
     providing less available memory for guest.


Thanks,
James

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