From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ben Guthro Subject: Re: Xen inside Xen with VMX? Date: Thu, 31 Jan 2008 07:07:58 -0500 Message-ID: <47A1BA1E.3000305@virtualiron.com> References: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1368136973==" Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Mime-version: 1.0 Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Morten Hansen Cc: xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org This is a multi-part message in MIME format. --===============1368136973== Content-Type: multipart/alternative; boundary="------------000909050007000607060400" This is a multi-part message in MIME format. --------------000909050007000607060400 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Current VT implementations do not have this ability, AFAIK. Morten Hansen wrote: > Hello, > > out of curiosity, I was wondering if it is possible to support > recursive emulation in Xen, i.e. if it is possible to have Xen as a > guest in Xen (possibly with other guests inside those Xen's)? I'm > particularly curious if this is possible when running Xen using > Intel's VT extensions (or AMD's Pacifica), i.e. do these enhancements > provide the hypervisor with enough control that it can virtualize the > virtualization enhancements themselves (without a prohibitive loss in > performance)? > If it's not possible I guess VT etc. doesn't really offer true > emulation since the guest would be able to detect the emulation by > noticing that it wasn't itself able to become a hypervisor. > > Thank you in advance! > > Best regards, > > MH > > ------------------------------------------------------------------------ > Express yourself instantly with MSN Messenger! MSN Messenger > > ------------------------------------------------------------------------ > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel > --------------000909050007000607060400 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Current VT implementations do not have this ability, AFAIK.

Morten Hansen wrote:
Hello,

out of curiosity, I was wondering if it is possible to support recursive emulation in Xen, i.e. if it is possible to have Xen as a guest in Xen (possibly with other guests inside those Xen's)? I'm particularly curious if this is possible when running Xen using Intel's VT extensions (or AMD's Pacifica), i.e. do these enhancements provide the hypervisor with enough control that it can virtualize the virtualization enhancements themselves (without a prohibitive loss in performance)?
If it's not possible I guess VT etc. doesn't really offer true emulation since the guest would be able to detect the emulation by noticing that it wasn't itself able to become a hypervisor.

Thank you in advance!

Best regards,

MH

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