Currently we silently fail if SVM is already in use by a different
virtualization technology.
This is bad since it's non-obvious for the user, and its not too uncommon
for users to have several of these installed on same host.
This patch adds a message to notify the user of the problem.
Signed-off-by: Sasha Levin <levinsasha928@xxxxxxxxx>
---
arch/x86/kvm/svm.c | 5 ++++-
1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index e32243e..8d1a066 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -587,8 +587,11 @@ static int svm_hardware_enable(void *garbage)
int me = raw_smp_processor_id();
rdmsrl(MSR_EFER, efer);
- if (efer & EFER_SVME)
+ if (efer & EFER_SVME) {
+ printk_once(KERN_ERR "svm_hardware_enable: SVM already in use on CPU%d. "
+ "Are you already another hypervisor?\n", me);
return -EBUSY;
+ }
if (!has_svm()) {
printk(KERN_ERR "svm_hardware_enable: err EOPNOTSUPP on %d\n",
--
1.7.8
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