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Message-ID: <53F1E10D.7060007@redhat.com> Date: Mon, 18 Aug 2014 13:18:37 +0200 From: Paolo Bonzini <pbonzini@...hat.com> To: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>, Wanpeng Li <wanpeng.li@...ux.intel.com> CC: Gleb Natapov <gleb@...nel.org>, hpa@...or.com, x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 1/5] KVM: vmx: fix ept reserved bits for 1-GByte page Il 18/08/2014 12:52, Xiao Guangrong 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. > That mask is only set in the lowest pte for 4K page, i think it > is not a problem, no? It will cause KVM to WARN. The EPT memory type will also be ignored for gigabyte pages. Paolo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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