From: Joseph Cihula Date: Tue, 8 Feb 2011 19:45:56 +0000 (-0800) Subject: KVM: VMX: fix detection of BIOS disabling VMX X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=23f3e99132aa5c5f887648c50597d8f2b5800417;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git KVM: VMX: fix detection of BIOS disabling VMX This patch fixes the logic used to detect whether BIOS has disabled VMX, for the case where VMX is enabled only under SMX, but tboot is not active. Signed-off-by: Joseph Cihula Signed-off-by: Avi Kivity --- diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index ae4f02d47091..f76137ce71c6 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -1333,19 +1333,25 @@ static __init int vmx_disabled_by_bios(void) rdmsrl(MSR_IA32_FEATURE_CONTROL, msr); if (msr & FEATURE_CONTROL_LOCKED) { + /* launched w/ TXT and VMX disabled */ if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX) && tboot_enabled()) return 1; + /* launched w/o TXT and VMX only enabled w/ TXT */ if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX) + && (msr & FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX) && !tboot_enabled()) { printk(KERN_WARNING "kvm: disable TXT in the BIOS or " - " activate TXT before enabling KVM\n"); + "activate TXT before enabling KVM\n"); return 1; } + /* launched w/o TXT and VMX disabled */ + if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX) + && !tboot_enabled()) + return 1; } return 0; - /* locked but not enabled */ } static void kvm_cpu_vmxon(u64 addr)