Re: [PATCH 1/5] KVM: vmx: fix ept reserved bits for 1-GByte page

From: Xiao Guangrong
Date: Mon Aug 18 2014 - 06:52:20 EST


On 08/18/2014 05:50 PM, Wanpeng Li wrote:
> 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.

That mask is only set in the lowest pte for 4K page, i think it
is not a problem, no?

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