Don't test hypervisor magic if HV base leaf is not supported

diff --git a/platform/hw/arch/x86/hypervisor.c b/platform/hw/arch/x86/hypervisor.c
index 1dcaa7a08cba76edd9342652d4f41022e7bc757f..00ccbf6cfbbe06fd84000aac5bd1e7c8254b20f8 100644 (file)
--- 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;