 Home |
Products |
Support |
Community |
News |
xen-devel
Re: [Xen-devel] [PATCH] support protected mode mmio with non-zero CS bas
| To: | Jan Beulich <jbeulich@xxxxxxxxxx>, Mats Petersson <Mats.Petersson@xxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] support protected mode mmio with non-zero CS base |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Wed, 22 Nov 2006 07:51:56 +0000 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Tue, 21 Nov 2006 23:52:12 -0800 |
| Envelope-to: | www-data@xxxxxxxxxxxxxxxxxx |
| In-reply-to: | <45640C04.76E4.0078.0@xxxxxxxxxx> |
| 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: | AccOCxTQUy/Hann+Edut4AANk04WTA== |
| Thread-topic: | [Xen-devel] [PATCH] support protected mode mmio with non-zero CS base |
| User-agent: | Microsoft-Entourage/11.2.5.060620 |
On 22/11/06 7:36 am, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote: >> Remove the "if ( realmode ) " and just use the segment base address. The >> base-address in the register should be correct even in realmod, or the >> processor is broken. [I don't think this code is being executed from >> vmxassist - if it is, then that's a different special case!]. > > I intentionally didn't, as at least on VMX the read operation could > be significantly slower than a shift (and due to the indirect call it will > be slower even on SVM). We'll be using the segment base info everywhere in future, otherwise big real mode does not work. Also, realmode is going to be the uncommon case by far here (and we don't care that much for its performance as long as it doesn't noticeably suck too badly). -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
| <Prev in Thread] | Current Thread | [Next in Thread> |
|---|---|---|
| ||
| Previous by Date: | RE: [Xen-devel][RFC]degradation on IPF due to hypercall set irq, Xu, Anthony |
|---|---|
| Next by Date: | Re: [Xen-devel][RFC]degradation on IPF due to hypercall set irq, Keir Fraser |
| Previous by Thread: | RE: [Xen-devel] [PATCH] support protected mode mmio with non-zero CS base, Jan Beulich |
| Next by Thread: | RE: [Xen-devel] [PATCH] support protected mode mmio with non-zero CS base, Petersson, Mats |
| Indexes: | [Date] [Thread] [Top] [All Lists] |
