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 <asm/processor.h>
15 #include <asm/hypervisor.h>
16 #include <asm/hyperv.h>
17 #include <asm/mshyperv.h>
19 struct ms_hyperv_info ms_hyperv;
21 static bool __init ms_hyperv_platform(void)
26 if (!boot_cpu_has(X86_FEATURE_HYPERVISOR))
29 cpuid(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS,
30 &eax, &hyp_signature[0], &hyp_signature[1], &hyp_signature[2]);
32 return eax >= HYPERV_CPUID_MIN &&
33 eax <= HYPERV_CPUID_MAX &&
34 !memcmp("Microsoft Hv", hyp_signature, 12);
37 static void __init ms_hyperv_init_platform(void)
40 * Extract the features and hints
42 ms_hyperv.features = cpuid_eax(HYPERV_CPUID_FEATURES);
43 ms_hyperv.hints = cpuid_eax(HYPERV_CPUID_ENLIGHTMENT_INFO);
45 printk(KERN_INFO "HyperV: features 0x%x, hints 0x%x\n",
46 ms_hyperv.features, ms_hyperv.hints);
49 const __refconst struct hypervisor_x86 x86_hyper_ms_hyperv = {
50 .name = "Microsoft HyperV",
51 .detect = ms_hyperv_platform,
52 .init_platform = ms_hyperv_init_platform,
54 EXPORT_SYMBOL(x86_hyper_ms_hyperv);