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From: Wei Liu <wei.liu2@citrix.com>
To: James Dingwall <james-xen@dingwall.me.uk>
Cc: Wei Liu <wei.liu2@citrix.com>,
	Shannon Zhao <shannon.zhao@linaro.org>,
	xen-devel@lists.xen.org
Subject: Re: xl mem-set for domain 0 regression
Date: Wed, 11 Oct 2017 17:00:45 +0100	[thread overview]
Message-ID: <20171011160045.kjndpldgl3xfqlz3@citrix.com> (raw)
In-Reply-To: <c77e0ce29558df3459573ae0550de821@dingwall.me.uk>

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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  reply	other threads:[~2017-10-11 16:00 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-10-10 15:03 xl mem-set for domain 0 regression James Dingwall
2017-10-11 16:00 ` Wei Liu [this message]
2017-10-12  9:06   ` James Dingwall

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