KVM: nVMX: Disable unrestricted mode if ept=0

commit 78051e3b7e35722ad3f31dd611f1b34770bddab8 upstream.

If L0 has disabled EPT, don't advertise unrestricted
mode at all since it depends on EPT to run real mode code.

Fixes: 92fbc7b195b824e201d9f06f2b93105f72384d65
Reviewed-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Bandan Das <bsd@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 0c90f4b3f835b62d539ba663f1b2ca01c09339aa..de426887b3599215467bc43d15b24a5f0c3650bd 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2320,12 +2320,12 @@ static __init void nested_vmx_setup_ctls_msrs(void)
        nested_vmx_secondary_ctls_low = 0;
        nested_vmx_secondary_ctls_high &=
                SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |
-               SECONDARY_EXEC_UNRESTRICTED_GUEST |
                SECONDARY_EXEC_WBINVD_EXITING;
 
        if (enable_ept) {
                /* nested EPT: emulate EPT also to L1 */
-               nested_vmx_secondary_ctls_high |= SECONDARY_EXEC_ENABLE_EPT;
+               nested_vmx_secondary_ctls_high |= SECONDARY_EXEC_ENABLE_EPT |
+                       SECONDARY_EXEC_UNRESTRICTED_GUEST;
                nested_vmx_ept_caps = VMX_EPT_PAGE_WALK_4_BIT |
                         VMX_EPTP_WB_BIT | VMX_EPT_2MB_PAGE_BIT |
                         VMX_EPT_INVEPT_BIT;