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Re: [Xen-devel] [PATCH 3/5] svm: implement instruction fetch part of Dec
| To: | Andre Przywara <andre.przywara@xxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH 3/5] svm: implement instruction fetch part of DecodeAssist |
| From: | Keir Fraser <keir@xxxxxxx> |
| Date: | Mon, 18 Apr 2011 10:10:46 +0100 |
| Cc: | xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Mon, 18 Apr 2011 02:11:48 -0700 |
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| Thread-topic: | [Xen-devel] [PATCH 3/5] svm: implement instruction fetch part of DecodeAssist |
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On 15/04/2011 13:22, "Andre Przywara" <andre.przywara@xxxxxxx> wrote: > Newer SVM implementations (Bulldozer) copy up to 15 bytes from the > instruction stream into the VMCB when a #PF or #NPF exception is > intercepted. This patch makes use of this information if available. > This saves us from a) traversing the guest's page tables, b) mapping > the guest's memory and c) copy the instructions from there into the > hypervisor's address space. > This speeds up #NPF intercepts quite a lot and avoids cache and TLB > trashing. This is a bit skanky. I'll have a think about a neater way of doing it. -- Keir > Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx> > > _______________________________________________ > 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 |
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