From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:35828 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753176AbdGSJoD (ORCPT ); Wed, 19 Jul 2017 05:44:03 -0400 Subject: Patch "kvm: vmx: allow host to access guest MSR_IA32_BNDCFGS" has been added to the 4.11-stable tree To: haozhong.zhang@intel.com, gregkh@linuxfoundation.org, pbonzini@redhat.com Cc: , From: Date: Wed, 19 Jul 2017 11:43:51 +0200 Message-ID: <15004574314881@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled kvm: vmx: allow host to access guest MSR_IA32_BNDCFGS to the 4.11-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: kvm-vmx-allow-host-to-access-guest-msr_ia32_bndcfgs.patch and it can be found in the queue-4.11 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From 691bd4340bef49cf7e5855d06cf24444b5bf2d85 Mon Sep 17 00:00:00 2001 From: Haozhong Zhang Date: Tue, 4 Jul 2017 10:27:41 +0800 Subject: kvm: vmx: allow host to access guest MSR_IA32_BNDCFGS From: Haozhong Zhang commit 691bd4340bef49cf7e5855d06cf24444b5bf2d85 upstream. It's easier for host applications, such as QEMU, if they can always access guest MSR_IA32_BNDCFGS in VMCS, even though MPX is disabled in guest cpuid. Signed-off-by: Haozhong Zhang Signed-off-by: Paolo Bonzini Signed-off-by: Greg Kroah-Hartman --- arch/x86/kvm/vmx.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -3200,7 +3200,8 @@ static int vmx_get_msr(struct kvm_vcpu * msr_info->data = vmcs_readl(GUEST_SYSENTER_ESP); break; case MSR_IA32_BNDCFGS: - if (!kvm_mpx_supported() || !guest_cpuid_has_mpx(vcpu)) + if (!kvm_mpx_supported() || + (!msr_info->host_initiated && !guest_cpuid_has_mpx(vcpu))) return 1; msr_info->data = vmcs_read64(GUEST_BNDCFGS); break; @@ -3282,7 +3283,8 @@ static int vmx_set_msr(struct kvm_vcpu * vmcs_writel(GUEST_SYSENTER_ESP, data); break; case MSR_IA32_BNDCFGS: - if (!kvm_mpx_supported() || !guest_cpuid_has_mpx(vcpu)) + if (!kvm_mpx_supported() || + (!msr_info->host_initiated && !guest_cpuid_has_mpx(vcpu))) return 1; if (is_noncanonical_address(data & PAGE_MASK) || (data & MSR_IA32_BNDCFGS_RSVD)) Patches currently in stable-queue which might be from haozhong.zhang@intel.com are queue-4.11/kvm-vmx-allow-host-to-access-guest-msr_ia32_bndcfgs.patch