1 /* 2 * HyperV Detection code. 3 * 4 * Copyright (C) 2010, Novell, Inc. 5 * Author : K. Y. Srinivasan <ksrinivasan@novell.com> 6 * 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. 10 * 11 */ 12 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> 19 20 struct ms_hyperv_info ms_hyperv; 21 22 static bool __init ms_hyperv_platform(void) 23 { 24 u32 eax; 25 u32 hyp_signature[3]; 26 27 if (!boot_cpu_has(X86_FEATURE_HYPERVISOR)) 28 return false; 29 30 cpuid(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS, 31 &eax, &hyp_signature[0], &hyp_signature[1], &hyp_signature[2]); 32 33 return eax >= HYPERV_CPUID_MIN && 34 eax <= HYPERV_CPUID_MAX && 35 !memcmp("Microsoft Hv", hyp_signature, 12); 36 } 37 38 static void __init ms_hyperv_init_platform(void) 39 { 40 /* 41 * Extract the features and hints 42 */ 43 ms_hyperv.features = cpuid_eax(HYPERV_CPUID_FEATURES); 44 ms_hyperv.hints = cpuid_eax(HYPERV_CPUID_ENLIGHTMENT_INFO); 45 46 printk(KERN_INFO "HyperV: features 0x%x, hints 0x%x\n", 47 ms_hyperv.features, ms_hyperv.hints); 48 } 49 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, 54 }; 55 EXPORT_SYMBOL(x86_hyper_ms_hyperv); 56