WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-users

RE: [Xen-users] Possible problem with PAE?

To: "Mike Levenhagen" <mjleven@xxxxxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-users] Possible problem with PAE?
From: "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
Date: Wed, 4 Jan 2006 16:59:36 -0000
Cc: Ronald Brightwell <rbbrigh@xxxxxxxxxx>, ian.pratt@xxxxxxxxxxxx
Delivery-date: Wed, 04 Jan 2006 17:05:02 +0000
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index: AcYRT2ybr/wOcuvNRxumCi6aI5j0WQAAC+sA
Thread-topic: [Xen-users] Possible problem with PAE?
 > I'm porting an OS to XEN 3.0 that uses PAE mode.
> It maps both virtual address space 0x00000000 and 0xC0000000 
> to the same physical address space, hence pgd slot 0 and pgd 
> slot 3 point to the same middle page directory. It appears 
> that XEN does not support this situation. The XEN error 
> message I get when I try to pin the pgd is
> 
> (XEN) DOM154: (file=mm.c, line=905) Failure in alloc_l3_table: entry 3
> (XEN) DOM154: (file=mm.c, line=1550) Error while validating 
> mfn d2a9 (pfn 10) for type 67ff0000: caf=80000003 taf=67ff0001
> (XEN) DOM154: (file=mm.c, line=1780) Error while pinning mfn d2a9
> 
> If I set pgd slot 0 to 0 the pin succeeds.
> 
> Does XEN support this "duplicate" mapping?

No. I imagine this is just in some start of day code in the OS that can
easily be re-jigged?

We have thought about supporting it as a slow-path operation, but it
would lead to greater complexity in the type checking code, so probably
not worth the effort.

> Is this the right place to ask this question?

xen-devel would be better.

BTW: what's the OS?

Best,
Ian

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users

<Prev in Thread] Current Thread [Next in Thread>