Re: [Xen-devel] xl mem-set for domain 0 regression

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Tue, Oct 10, 2017 at 04:03:32PM +0100, James Dingwall wrote:
> 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.

There should be a stub configuration file generated for Dom0.

Check if there is /var/lib/xen/userdata-d.0.0000-*000.libxl-json ?

If not, check if xen-init-dom0 service is run?

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