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 20struct ms_hyperv_info ms_hyperv; 21EXPORT_SYMBOL_GPL(ms_hyperv); 22 23static bool __init ms_hyperv_platform(void) 24{ 25 u32 eax; 26 u32 hyp_signature[3]; 27 28 if (!boot_cpu_has(X86_FEATURE_HYPERVISOR)) 29 return false; 30 31 cpuid(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS, 32 &eax, &hyp_signature[0], &hyp_signature[1], &hyp_signature[2]); 33 34 return eax >= HYPERV_CPUID_MIN && 35 eax <= HYPERV_CPUID_MAX && 36 !memcmp("Microsoft Hv", hyp_signature, 12); 37} 38 39static void __init ms_hyperv_init_platform(void) 40{ 41 /* 42 * Extract the features and hints 43 */ 44 ms_hyperv.features = cpuid_eax(HYPERV_CPUID_FEATURES); 45 ms_hyperv.hints = cpuid_eax(HYPERV_CPUID_ENLIGHTMENT_INFO); 46 47 printk(KERN_INFO "HyperV: features 0x%x, hints 0x%x\n", 48 ms_hyperv.features, ms_hyperv.hints); 49} 50 51const __refconst struct hypervisor_x86 x86_hyper_ms_hyperv = { 52 .name = "Microsoft HyperV", 53 .detect = ms_hyperv_platform, 54 .init_platform = ms_hyperv_init_platform, 55}; 56EXPORT_SYMBOL(x86_hyper_ms_hyperv); 57