From: Shane Wang <shane.wang@intel.com>
Date: Wed, 17 Nov 2010 03:40:17 +0000 (+0800)
Subject: KVM: VMX: Inform user about INTEL_TXT dependency
X-Git-Tag: v2.6.38-rc1~244^2~81
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f9335afea5d649693aee1ec8af2cc8ccf376f5a9;p=profile%2Fivi%2Fkernel-adaptation-intel-automotive.git

KVM: VMX: Inform user about INTEL_TXT dependency

Inform user to either disable TXT in the BIOS or do TXT launch
with tboot before enabling KVM since some BIOSes do not set
FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX bit when TXT is enabled.

Signed-off-by: Shane Wang <shane.wang@intel.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
---

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 8087c4d..92612fb 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -1305,8 +1305,11 @@ static __init int vmx_disabled_by_bios(void)
 			&& tboot_enabled())
 			return 1;
 		if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX)
-			&& !tboot_enabled())
+			&& !tboot_enabled()) {
+			printk(KERN_WARNING "kvm: disable TXT in the BIOS or "
+				" activate TXT before enabling KVM\n");
 			return 1;
+		}
 	}
 
 	return 0;