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 4.4-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-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 691bd4340bef49cf7e5855d06cf24444b5bf2d85 Mon Sep 17 00:00:00 2001
From: Haozhong Zhang <haozhong.zhang@xxxxxxxxx>
Date: Tue, 4 Jul 2017 10:27:41 +0800
Subject: kvm: vmx: allow host to access guest MSR_IA32_BNDCFGS
From: Haozhong Zhang <haozhong.zhang@xxxxxxxxx>
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 <haozhong.zhang@xxxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -2813,7 +2813,8 @@ static int vmx_get_msr(struct kvm_vcpu *
msr_info->data = vmcs_readl(GUEST_SYSENTER_ESP);
break;
case MSR_IA32_BNDCFGS:
- if (!vmx_mpx_supported() || !guest_cpuid_has_mpx(vcpu))
+ if (!vmx_mpx_supported() ||
+ (!msr_info->host_initiated && !guest_cpuid_has_mpx(vcpu)))
return 1;
msr_info->data = vmcs_read64(GUEST_BNDCFGS);
break;
@@ -2890,7 +2891,8 @@ static int vmx_set_msr(struct kvm_vcpu *
vmcs_writel(GUEST_SYSENTER_ESP, data);
break;
case MSR_IA32_BNDCFGS:
- if (!vmx_mpx_supported() || !guest_cpuid_has_mpx(vcpu))
+ if (!vmx_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@xxxxxxxxx are
queue-4.4/kvm-vmx-allow-host-to-access-guest-msr_ia32_bndcfgs.patch