From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: [PATCH 0/5] Fix EFER.NX=0 with EPT Date: Wed, 28 Apr 2010 16:47:14 +0300 Message-ID: <1272462439-30881-1-git-send-email-avi@redhat.com> Cc: kvm@vger.kernel.org To: Marcelo Tosatti Return-path: Received: from mx1.redhat.com ([209.132.183.28]:50635 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752247Ab0D1NrV (ORCPT ); Wed, 28 Apr 2010 09:47:21 -0400 Received: from int-mx08.intmail.prod.int.phx2.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.21]) by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id o3SDlKdY027443 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Wed, 28 Apr 2010 09:47:20 -0400 Received: from cleopatra.tlv.redhat.com (cleopatra.tlv.redhat.com [10.35.255.11]) by int-mx08.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id o3SDlJtD002685 for ; Wed, 28 Apr 2010 09:47:20 -0400 Sender: kvm-owner@vger.kernel.org List-ID: Currently we run with EFER.NX=1 on the guest even if the guest value is 0. This is fine with shadow, since we check bit 63 when instantiating a page table, and fault if bit 63 is set while EFER.NX is clear. This doesn't work with EPT, since we no longer get the change to check guest ptes. So we need to run with EFER.NX=0. This is complicated by the fact that if we switch EFER.NX on the host, we'll trap immediately, since some host pages are mapped with the NX bit set. As a result, we need to switch the MSR atomically during guest entry and exit. This patchset implements the complications described above. Avi Kivity (5): KVM: Let vcpu structure alignment be determined at runtime KVM: VMX: Add definition for msr autoload entry KVM: VMX: Add definitions for guest and host EFER autoswitch vmcs entries KVM: VMX: Add facility to atomically switch MSRs on guest entry/exit KVM: VMX: Atomically switch efer if EPT && !EFER.NX arch/ia64/kvm/vmm.c | 2 +- arch/powerpc/kvm/44x.c | 2 +- arch/powerpc/kvm/book3s.c | 3 +- arch/powerpc/kvm/e500.c | 2 +- arch/s390/kvm/kvm-s390.c | 2 +- arch/x86/include/asm/vmx.h | 12 +++++++- arch/x86/kvm/svm.c | 2 +- arch/x86/kvm/vmx.c | 63 +++++++++++++++++++++++++++++++++++++++++++- include/linux/kvm_host.h | 2 +- virt/kvm/kvm_main.c | 7 +++-- 10 files changed, 85 insertions(+), 12 deletions(-)