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[Xen-devel] [PATCH 3/4] Enable VirtualPC 2007 run on top of XEN: REPS pr
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| 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 |
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| 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>
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