Yes, I thought it is console=ttyS0. Actually, that should be to dom0 kernel. 
Thanks.



jones
 
From: Konrad Rzeszutek Wilk
Date: 2015-12-11 03:06
To: quizyjones
CC: xen-devel@lists.xen.org
Subject: Re: [Xen-devel] how can I debug nested xen?
On Thu, Dec 10, 2015 at 02:15:32PM +0000, quizyjones wrote:
> I can debug xen using console connections. However, HVM nested xen seems to 
> not support 'xl console'. Even though I set the console according to 
> http://www.dedoimedo.com/computers/xen-console.html, it still cannot output 
> xen related infomation. Any suggestions?      
 
Nonsense - it works.
 
Did you set on Xen's (the nested one) com1=115200 console=com1?
 
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