Re: [Xen-ia64-devel][PATCH] optimization for windows - Jürgen Groß - com.xensource.lists.xen-ia64-devel

16 messages in com.xensource.lists.xen-ia64-develRe: [Xen-ia64-devel][PATCH] optimizat...

From	Sent On	Attachments
Xu, Anthony	27 Apr 2007 02:04	.patch
Jürgen Groß	27 Apr 2007 02:27
Xu, Anthony	27 Apr 2007 02:35
Alex Williamson	27 Apr 2007 06:07
Jürgen Groß	27 Apr 2007 06:19
Yang, Fred	27 Apr 2007 11:03
Yang, Fred	27 Apr 2007 11:40
Xu, Anthony	27 Apr 2007 19:10
Tristan Gingold	28 Apr 2007 06:36
Tristan Gingold	28 Apr 2007 06:39
Tristan Gingold	28 Apr 2007 06:41
Xu, Anthony	28 Apr 2007 19:21
Xu, Anthony	28 Apr 2007 19:28
Xu, Anthony	28 Apr 2007 19:31
Alex Williamson	06 May 2007 07:02
Xu, Anthony	07 May 2007 19:54

Subject:	Re: [Xen-ia64-devel][PATCH] optimization for windows
From:	Jürgen Groß (juer...@fujitsu-siemens.com)
Date:	04/27/2007 06:19:44 AM
List:	com.xensource.lists.xen-ia64-devel

Alex Williamson wrote:

On Fri, 2007-04-27 at 17:36 +0800, Xu, Anthony wrote:

Wouldn't it be better to have some generic features like "region x identity mapping with attributes y" which can be set via DomU configuration file?

It is not convenient for user. And user can't know this information, if we provide this interface to user. User may be confused, and if user uses this configuration incorrectly, it will break guest.

I think we need to be careful not to hide too many assumptions about the guest in Xen as well. We can't be certain another OS won't use region 7 like this at some point. I agree that a requiring a user to know certain memory layout attributes is way too low level, but what about a simple flag like "guest = windows". Yes, it's not automatic like the code is now, but it feels more supportable. Thanks,

I agree. Further I would like to suggest to build up a "feature vector" dependant on the simple flag. So instead of testing "guest is windows" you would test for a feature which is set at boot time of the guest. This is a benefit as soon as more than one guest type is treated in a special way by Xen.

Juergen