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-ia64-devel

RE: [Xen-devel] [BUNDLE] Testing a simpler inter-domain transport

To: "Yang, Fred" <fred.yang@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] [BUNDLE] Testing a simpler inter-domain transport
From: "Magenheimer, Dan (HP Labs Fort Collins)" <dan.magenheimer@xxxxxx>
Date: Mon, 6 Feb 2006 13:38:36 -0800
Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>, xen-ia64-devel <xen-ia64-devel@xxxxxxxxxxxxxxxxxxx>
Delivery-date: Mon, 06 Feb 2006 21:49:26 +0000
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index: AcYrACLAC44DyOH2SMyhzX4zn+iQvQAVcqRQAAFpVvAAAlMqcA==
Thread-topic: [Xen-devel] [BUNDLE] Testing a simpler inter-domain transport
Hi Fred --

My recollection is that we agreed (with the IBM PPC guys also)
that dom0 should use virtual-physical (VP), except for DMA
which would be forced to use a software IOMMU.

Note that Rusty's idt code replaces the existing VBD/VNIF
and grant table mechanism, so it would be nice to ensure
it is more portable before it becomes part of the Xen core.

Dan

> -----Original Message-----
> From: Yang, Fred [mailto:fred.yang@xxxxxxxxx] 
> Sent: Monday, February 06, 2006 1:48 PM
> To: Magenheimer, Dan (HP Labs Fort Collins); 
> xen-devel@xxxxxxxxxxxxxxxxxxx
> Cc: Rusty Russell; xen-ia64-devel
> Subject: RE: [Xen-devel] [BUNDLE] Testing a simpler 
> inter-domain transport
> 
> Dan,
> 
> From Xen summit, isn't it to be more P2M liked approach due to
> consideration on driver domain and domain0 needs to get P2M for
> VBD/VNIF?   
> 
> Don't remember there is decision on taking Hypercall only approach and
> dropped P2M table lookup.  Any justification here?
> 
> -Fred
> 
> Magenheimer, Dan (HP Labs Fort Collins) wrote:
> > (I'm sure you meant PPC *and* ia64 ;*)
> > 
> > On just a quick skim, one thing to note:
> > 
> > IIRC from the summit, domain0 and driver domains for
> > neither PPC nor ia64 will have a p2m lookup table so
> > a p2m translation will require a hypercall. So
> > while virt_to_machine is cheap for domains on x86,
> > it is not on PPC and ia64.  If HYPERVISOR_share can
> > take physical addresses instead of machine addresses
> > (with Xen doing the phys_to_machine part of the
> > translation), I think the code would work better
> > for PPC and ia64, as well as better hide the
> > virtual->physical->machine memory abstraction.
> > 
> > Dan
> > 
> > 
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel
> 
> 

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

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