This is a note to let you know that I've just added the patch titled
KVM: nVMX: Fix EPT switching advertising
to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: kvm-nvmx-fix-ept-switching-advertising.patch and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From foo@baz Mon Dec 18 13:28:59 CET 2017
From: Wanpeng Li wanpeng.li@hotmail.com Date: Thu, 19 Oct 2017 07:00:34 +0800 Subject: KVM: nVMX: Fix EPT switching advertising
From: Wanpeng Li wanpeng.li@hotmail.com
[ Upstream commit 575b3a2cb439b03fd603ea77c73c76f3ed237596 ]
I can use vmxcap tool to observe "EPTP Switching yes" even if EPT is not exposed to L1.
EPT switching is advertised unconditionally since it is emulated, however, it can be treated as an extended feature for EPT and it should not be advertised if EPT itself is not exposed. This patch fixes it.
Reviewed-by: David Hildenbrand david@redhat.com Cc: Paolo Bonzini pbonzini@redhat.com Cc: Radim Krčmář rkrcmar@redhat.com Cc: Jim Mattson jmattson@google.com Signed-off-by: Wanpeng Li wanpeng.li@hotmail.com Signed-off-by: Radim Krčmář rkrcmar@redhat.com Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/kvm/vmx.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
--- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -2845,8 +2845,9 @@ static void nested_vmx_setup_ctls_msrs(s * Advertise EPTP switching unconditionally * since we emulate it */ - vmx->nested.nested_vmx_vmfunc_controls = - VMX_VMFUNC_EPTP_SWITCHING; + if (enable_ept) + vmx->nested.nested_vmx_vmfunc_controls = + VMX_VMFUNC_EPTP_SWITCHING; }
/*
Patches currently in stable-queue which might be from wanpeng.li@hotmail.com are
queue-4.14/kvm-nvmx-fix-ept-switching-advertising.patch