xen-devel

[Top] [All Lists]

RE: [Xen-devel] A question about guest_walk_tables

from [Tian, Kevin]

[Permanent Link][Original]

To:	"Tim Deegan" <Tim.Deegan@xxxxxxxxxx>
Subject:	RE: [Xen-devel] A question about guest_walk_tables
From:	"Tian, Kevin" <kevin.tian@xxxxxxxxx>
Date:	Thu, 6 Dec 2007 09:41:28 +0800
Cc:	xen-devel@xxxxxxxxxxxxxxxxxxx
Delivery-date:	Wed, 05 Dec 2007 17:42:28 -0800
Envelope-to:	www-data@xxxxxxxxxxxxxxxxxx
In-reply-to:	<20071205103444.GB7121@xxxxxxxxxxxxxxxxxxxxx>
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>
References:	<D470B4E54465E3469E2ABBC5AFAC390F024D8CEA@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> <20071205103444.GB7121@xxxxxxxxxxxxxxxxxxxxx>
Sender:	xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index:	Acg3KoVNc3owlGDvTVS3+0T+4OFw6QAfk4sQ
Thread-topic:	[Xen-devel] A question about guest_walk_tables

>From: Tim Deegan [mailto:Tim.Deegan@xxxxxxxxxx] 
>Sent: 2007年12月5日 18:35
>
>At 18:22 +0800 on 05 Dec (1196878922), Tian, Kevin wrote:
>> Hi, Tim,
>>      Just a curious question. Any reason why sh_page_fault can't
>> benefit vtlb_lookup to skip heavy-weight guest_walk_tables, 
>like other
>> places like sh_gva_to_gfn?
>
>For cases when we go on to make the shadow pagetables, we need the full
>walk available so we know which MFNs to shadow.
>
>I don't know whether it would be worth adding a vtlb lookup for the
>real-fault case; the fast-path code for not-present and MMIO catches a
>lot of genuine faults already.  We should definitely add the 
>walk result
>to the vTLB in any case.
>
>Thanks,
>
>Tim.
>

Understand. fast-path should be enough without vtlb help. 

Thanks,
Kevin

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

[More with this subject...]

<Prev in Thread]	Current Thread	[Next in Thread>
[Xen-devel] A question about guest_walk_tables, Tian, Kevin Re: [Xen-devel] A question about guest_walk_tables, Tim Deegan RE: [Xen-devel] A question about guest_walk_tables, Tian, Kevin <= RE: [Xen-devel] A question about guest_walk_tables, Tian, Kevin

Previous by Date:	Re: [Xen-devel] Page tables in Xen, tgh
Next by Date:	[Xen-devel] [Q] guest system call doesn't do do_iret() ?, Min Lee
Previous by Thread:	Re: [Xen-devel] A question about guest_walk_tables, Tim Deegan
Next by Thread:	RE: [Xen-devel] A question about guest_walk_tables, Tian, Kevin
Indexes:	[Date] [Thread] [Top] [All Lists]