From d3cffe0f8d8954bc7872164dce008af0e6ba5597 Mon Sep 17 00:00:00 2001
From: Martin Lucina <martin@lucina.net>
Date: Mon, 12 Oct 2015 12:01:11 +0200
Subject: [PATCH] Don't test hypervisor magic if HV base leaf is not supported

---
 platform/hw/arch/x86/hypervisor.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/platform/hw/arch/x86/hypervisor.c b/platform/hw/arch/x86/hypervisor.c
index 1dcaa7a..00ccbf6 100644
--- a/platform/hw/arch/x86/hypervisor.c
+++ b/platform/hw/arch/x86/hypervisor.c
@@ -49,6 +49,8 @@ int hypervisor_detect(void)
 	 * Source: https://lkml.org/lkml/2008/10/1/246
 	 */
 	x86_cpuid(0x40000000, &eax, &ebx, &ecx, &edx);
+	if (!(eax >= 0x40000000))
+		return 0;
 	/* Xen: "XenVMMXenVMM" */
 	if (ebx == 0x566e6558 && ecx == 0x65584d4d && edx == 0x4d4d566e)
 		return HYPERVISOR_XEN;
-- 
2.39.5