[PATCH] KVM: VMX: Inform user about INTEL_TXT dependency

[Jan Kiszka]

From: Jan Kiszka <jan.kis...@siemens.com>

Without CONFIG_INTEL_TXT, the user must not enable this feature in the
BIOS. Otherwise, KVM will not work. Explain this dependency via a kernel
log message.

Signed-off-by: Jan Kiszka <jan.kis...@siemens.com>
---
 arch/x86/kvm/vmx.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 9367abc..ebafd57 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -1306,8 +1306,13 @@ static __init int vmx_disabled_by_bios(void)
                        && tboot_enabled())
                        return 1;
                if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX)
-                       && !tboot_enabled())
+                       && !tboot_enabled()) {
+#ifndef CONFIG_INTEL_TXT
+                       printk(KERN_INFO "kvm: if TXT is enabled in the bios, "
+                                        "kvm depends on CONFIG_INTEL_TXT\n");
+#endif
                        return 1;
+               }
        }
 
        return 0;
-- 
1.7.1
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