From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keir Fraser <keir@xen.org>
Subject: Re: [PATCH 3/5] svm: implement instruction fetch part of
	DecodeAssist
Date: Mon, 18 Apr 2011 13:37:21 +0100
Message-ID: <C9D1EF11.2CBA1%keir@xen.org>
References: <4DA83889.5060306@amd.com>
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To: Andre Przywara <andre.przywara@amd.com>
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On 15/04/2011 13:22, "Andre Przywara" <andre.przywara@amd.com> 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.

Rewritten quite a bit and applied as c/s 23238. You probably should check it
still works and with the performance improvement you expect. :-)

 -- Keir

> Signed-off-by: Andre Przywara <andre.przywara@amd.com>
> 
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