2 * HyperV Detection code.
4 * Copyright (C) 2010, Novell, Inc.
5 * Author : K. Y. Srinivasan <ksrinivasan@novell.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; version 2 of the License.
13 #include <linux/types.h>
14 #include <linux/module.h>
15 #include <asm/processor.h>
16 #include <asm/hypervisor.h>
17 #include <asm/hyperv.h>
18 #include <asm/mshyperv.h>
20 struct ms_hyperv_info ms_hyperv
;
22 static bool __init
ms_hyperv_platform(void)
27 if (!boot_cpu_has(X86_FEATURE_HYPERVISOR
))
30 cpuid(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS
,
31 &eax
, &hyp_signature
[0], &hyp_signature
[1], &hyp_signature
[2]);
33 return eax
>= HYPERV_CPUID_MIN
&&
34 eax
<= HYPERV_CPUID_MAX
&&
35 !memcmp("Microsoft Hv", hyp_signature
, 12);
38 static void __init
ms_hyperv_init_platform(void)
41 * Extract the features and hints
43 ms_hyperv
.features
= cpuid_eax(HYPERV_CPUID_FEATURES
);
44 ms_hyperv
.hints
= cpuid_eax(HYPERV_CPUID_ENLIGHTMENT_INFO
);
46 printk(KERN_INFO
"HyperV: features 0x%x, hints 0x%x\n",
47 ms_hyperv
.features
, ms_hyperv
.hints
);
50 const __refconst
struct hypervisor_x86 x86_hyper_ms_hyperv
= {
51 .name
= "Microsoft HyperV",
52 .detect
= ms_hyperv_platform
,
53 .init_platform
= ms_hyperv_init_platform
,
55 EXPORT_SYMBOL(x86_hyper_ms_hyperv
);