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[Xen-devel] [PATCH 3/5] svm: implement instruction fetch part of DecodeA
| To: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] [PATCH 3/5] svm: implement instruction fetch part of DecodeAssist |
| From: | Andre Przywara <andre.przywara@xxxxxxx> |
| Date: | Fri, 15 Apr 2011 14:22:33 +0200 |
| Cc: | xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Fri, 15 Apr 2011 05:28:01 -0700 |
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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. Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
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