Currently we silently fail if VMX 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.
Cc: Joerg Roedel <joerg.roe...@amd.com>
Cc: Avi Kivity <a...@redhat.com>
Cc: Marcelo Tosatti <mtosa...@redhat.com>
Cc: kvm@vger.kernel.org
Signed-off-by: Sasha Levin <levinsasha...@gmail.com>
---
arch/x86/kvm/vmx.c | 5 ++++-
1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 4ceced2..0ef59ed 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2300,8 +2300,11 @@ static int hardware_enable(void *garbage)
u64 phys_addr = __pa(per_cpu(vmxarea, cpu));
u64 old, test_bits;
- if (read_cr4() & X86_CR4_VMXE)
+ if (read_cr4() & X86_CR4_VMXE) {
+ printk(KERN_ERR "hardware_enable: VMX already in use on CPU%d. "
+ "Are you already another hypervisor?\n", cpu);
return -EBUSY;
+ }
INIT_LIST_HEAD(&per_cpu(loaded_vmcss_on_cpu, cpu));
rdmsrl(MSR_IA32_FEATURE_CONTROL, old);
--
1.7.8.rc4
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