Re: [Xen-devel] drjones@xxxxxxxxxx, vkuznets@xxxxxxxxxx, leiwang@xxxxxxxxxx, wshi@xxxxxxxxxx

[Lingfei Kong <lkong@xxxxxxxxxx>]

On 04/23/2014 06:58 PM, George Dunlap wrote:
> On 04/23/2014 01:56 AM, Lingfei Kong wrote:
>> On 04/22/2014 06:59 PM, George Dunlap wrote:
>>> On Fri, Apr 18, 2014 at 2:40 AM, Lingfei Kong <lkong@xxxxxxxxxx> wrote:
>>>> Hello,
>>>> When i create a guest with option 'cpus="0-3"' on the command line,
>>>> xl can not parse the config. But it works well when i specify
>>>> 'cpus=1' on the command line. I read the man page xl.cfg, learned
>>>> that xl support the following format:
>>>> "0-3,5,^1"
>>>> so  it would be very nice if xl can support this format on the
>>>> command line too.
>>>>
>>>> Also i have file a bug on bugzilla: Bug 1886 - option `cpus="0-3"`
>>>> works well when you specify it in a configure file, but it give a
>>>> error feadback when you add it to the command line
>>>>
>>>>
>>>>
>>>> The following are the  details:
>>>>
>>>> Description of problem:
>>>> option `cpus="0-3"` works well when you specify it in a configure
>>>> file, but it give a error feadback when you add it to the command line.
>>>>
>>>> Version-Release number of selected component (if applicable):
>>>>
>>>> How reproducible:
>>>> 100%
>>>>
>>>> Steps to Reproduce:
>>>> 1. Install a host with xen4
>>>> 2. Create a guest, add option 'cpus="0-3"' on the command line
>>>> # xl -v create hvm-7.0-64-1.cfg cpus="0-3"
>>>> Parsing config from hvm-7.0-64-1.cfg
>>>> hvm-7.0-64-1.cfg:28: config parsing error near `-3': lexical error
>>>> warning: Config file looks like it contains Python code.
>>>> warning:  Arbitrary Python is no longer supported.
>>>> warning:  See http://wiki.xen.org/wiki/PythonInXlConfig
>>>> Failed to parse config: Invalid argument
>>> The problem here is that your shell is discarding the quotes; so what
>>> xl sees is 'cpus=0-3', not 'cpus="0-3"'.  Try the following:
>>>
>>> # xl -v create hvm-7.0-64-1.cfg cpus=\"0-3\"
>>>
>>> -George
>>>
>> Hi George,
>> Thanks for your hlep. It works with cpus=\"0-3\".
> 
> Actually, a better way would be to enclose the whole thing in single
> quotes, and separate variables with a ; like so:
> 
> # xl -v create hvm.cfg 'cpus="0-3"; memory=2048'
> 
> This should at very least be documented better -- I'll send a patch to
> update the xl man page.
> 
>  -George

Thanks for your explanation.
Maybe another solution is to change the xl command to adapt this. On
RHEL5 xen hypervisor, I can create a guest with `xm create hvm.cfg
cpus="0-3"`. As a user I prefer this method, because this will be
consistent with it's config file and it is strange to use ' to enclose
the parameters.


Best Regards
Lingfei Kong

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