KVM: SVM: Allow setting the SVME bit

Normally setting the SVME bit in EFER is not allowed, as we did
not support SVM. Not since we do, we should also allow enabling
SVM mode.

v2 comes as last patch, so we don't enable half-ready code
v4 introduces a module option to enable SVM
v6 warns that nesting is enabled

Acked-by: Joerg Roedel <joro@8bytes.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index df5b41192661a46b652a9bfcb65972bc5301ae0b..0fbbde54ecae5be8f73455a38412b28bf3c65bbe 100644 (file)
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -69,6 +69,9 @@ static int npt = 1;
 
 module_param(npt, int, S_IRUGO);
 
+static int nested = 0;
+module_param(nested, int, S_IRUGO);
+
 static void kvm_reput_irq(struct vcpu_svm *svm);
 static void svm_flush_tlb(struct kvm_vcpu *vcpu);
 
@@ -443,6 +446,11 @@ static __init int svm_hardware_setup(void)
        if (boot_cpu_has(X86_FEATURE_NX))
                kvm_enable_efer_bits(EFER_NX);
 
+       if (nested) {
+               printk(KERN_INFO "kvm: Nested Virtualization enabled\n");
+               kvm_enable_efer_bits(EFER_SVME);
+       }
+
        for_each_online_cpu(cpu) {
                r = svm_cpu_init(cpu);
                if (r)