linux-kernel - Re: [PATCH v4] KVM: vmx: fix ept reserved bits for 1-GByte page

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Message-ID: <53F45893.6050305@redhat.com>
Date:	Wed, 20 Aug 2014 10:13:07 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Wanpeng Li <wanpeng.li@...ux.intel.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	Gleb Natapov <gleb@...nel.org>,
	Zhang Yang <yang.z.zhang@...el.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] KVM: vmx: fix ept reserved bits for 1-GByte page

Il 20/08/2014 09:31, Wanpeng Li ha scritto:
> EPT misconfig handler in kvm will check which reason lead to EPT
> misconfiguration after vmexit. One of the reasons is that an EPT
> paging-structure entry is configured with settings reserved for
> future functionality. However, the handler can't identify if
> paging-structure entry of reserved bits for 1-GByte page are
> configured, since PDPTE which point to 1-GByte page will reserve
> bits 29:12 instead of bits 7:3 which are reserved for PDPTE that
> references an EPT Page Directory. This patch fix it by reserve
> bits 29:12 for 1-GByte page.

Thanks, the patch looks good.

Can you describe how you detected the problem and how you're testing for it?

Paolo
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