 Home |
About Xen.org |
Xen |
Xen Summit |
Wiki |
Mailing List |
Bug Tracker |
Xen Downloads |
xen-devel
[Xen-devel] [PATCH 3/4] Enable VirtualPC 2007 run on top of XEN: REPS pr
| To: | <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] [PATCH 3/4] Enable VirtualPC 2007 run on top of XEN: REPS prefix emulation |
| From: | "Su, Disheng" <disheng.su@xxxxxxxxx> |
| Date: | Fri, 1 Feb 2008 14:24:24 +0800 |
| Delivery-date: | Thu, 31 Jan 2008 22:28:38 -0800 |
| Envelope-to: | www-data@xxxxxxxxxxxxxxxxxx |
| 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: | AchkmxcHQwHey2ZwTRS1yh1TOAqD+g== |
| Thread-topic: | [PATCH 3/4] Enable VirtualPC 2007 run on top of XEN: REPS prefix emulation |
REPS prefix emulation for INS and OUTS is already in xen. Can we enable REPS for "stos" and "movs" in paging mode? Although it doesn't benefit a lot for normal hvm guest, in virtualpc case, I have to do that. VirtualPC will call "reps stos"(ecx=0x400, eax=0) a lot, about 1000 times per second. It seems to clear a L1 page table page, it can't be fast unshadowed in check_for_early_unshadow and it's even ReadOnly in guest page table(CR0.wp = 0). So we get 0x400 * 1000 times page faults per second, so CPU cycle is almost wasted on it. Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx> Signed-off-by: Disheng Su <disheng.su.com>
_______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
| <Prev in Thread] | Current Thread | [Next in Thread> |
|---|---|---|
| ||
| Previous by Date: | [Xen-devel] [PATCH 2/4] Enable VirtualPC 2007 run on top of XEN: fxsave emulation, Su, Disheng |
|---|---|
| Next by Date: | [Xen-devel] [PATCH 4/4] Enable VirtualPC 2007 run on top of XEN: add_write_for_data_pages, Su, Disheng |
| Previous by Thread: | [Xen-devel] [PATCH 2/4] Enable VirtualPC 2007 run on top of XEN: fxsave emulation, Su, Disheng |
| Next by Thread: | [Xen-devel] [PATCH 4/4] Enable VirtualPC 2007 run on top of XEN: add_write_for_data_pages, Su, Disheng |
| Indexes: | [Date] [Thread] [Top] [All Lists] |
xen.org, 