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
Signed-off-by: Alexander Graf <[EMAIL PROTECTED]>
---
arch/x86/kvm/svm.c | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index de1ece5..0cb0b5e 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -67,6 +67,9 @@ 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);
@@ -456,6 +459,11 @@ 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)
--
1.5.6
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