Re: [PATCH 11/11] nEPT: Provide the correct exit qualification upon EPT

[Jan Kiszka <jan.kiszka@web.de>]

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On 2013-04-27 08:42, Xu, Xinhao wrote:
> From 2df72c1e8e3b167a6008ab11e2a68d734c68e425 Mon Sep 17 00:00:00 2001
> From: Xinhao Xu <xinhao.xu@intel.com>
> Date: Sat, 27 Apr 2013 05:45:49 +0800
> Subject: [PATCH] nEPT: Check EPT misconfiguration while walking addr & move pte
>  check code to vmx.c

Please fix up the subject when posting a patch in reply to another one.

> 
> I add code to detect EPT misconfiguration and inject it to L1.
> Now L1 can correctly go to ept_misconfig handler(instead of
> wrongly going to fast_page_fault), it will try to handle mmio
> page fault, if failed, it is a real ept misconfiguration.
> 
> For scalability, Xiantao suggests me moving vendor specific
> code out from common code. In order to do this, I add new ops
> in kvm_mmu struct, check_tdp_pte, to provide an interface to
> check fault while walking address. The better way is to do
> fault detecting at here, but so far I just have checked ept
> misconfiguration. More patches will be added in future.

Seems there are some issues remaining. I can boot Linux as L2 when I
remove this patch. When it's applied, L2 becomes pretty slow and
eventually resets during kernel boot of L2. L1 remains stable.

Jan



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