1 /* 2 * Common hypervisor code 3 * 4 * Copyright (C) 2008, VMware, Inc. 5 * Author : Alok N Kataria <akataria@vmware.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; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, but 13 * WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or 15 * NON INFRINGEMENT. See the GNU General Public License for more 16 * details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 21 * 22 */ 23 24 #include <linux/module.h> 25 #include <asm/processor.h> 26 #include <asm/hypervisor.h> 27 28 static const __initconst struct hypervisor_x86 * const hypervisors[] = 29 { 30 #ifdef CONFIG_XEN 31 &x86_hyper_xen, 32 #endif 33 &x86_hyper_vmware, 34 &x86_hyper_ms_hyperv, 35 #ifdef CONFIG_KVM_GUEST 36 &x86_hyper_kvm, 37 #endif 38 }; 39 40 const struct hypervisor_x86 *x86_hyper; 41 EXPORT_SYMBOL(x86_hyper); 42 43 static inline void __init 44 detect_hypervisor_vendor(void) 45 { 46 const struct hypervisor_x86 *h, * const *p; 47 uint32_t pri, max_pri = 0; 48 49 for (p = hypervisors; p < hypervisors + ARRAY_SIZE(hypervisors); p++) { 50 h = *p; 51 pri = h->detect(); 52 if (pri != 0 && pri > max_pri) { 53 max_pri = pri; 54 x86_hyper = h; 55 } 56 } 57 58 if (max_pri) 59 printk(KERN_INFO "Hypervisor detected: %s\n", x86_hyper->name); 60 } 61 62 void init_hypervisor(struct cpuinfo_x86 *c) 63 { 64 if (x86_hyper && x86_hyper->set_cpu_features) 65 x86_hyper->set_cpu_features(c); 66 } 67 68 void __init init_hypervisor_platform(void) 69 { 70 71 detect_hypervisor_vendor(); 72 73 if (!x86_hyper) 74 return; 75 76 init_hypervisor(&boot_cpu_data); 77 78 if (x86_hyper->init_platform) 79 x86_hyper->init_platform(); 80 } 81 82 bool __init hypervisor_x2apic_available(void) 83 { 84 return x86_hyper && 85 x86_hyper->x2apic_available && 86 x86_hyper->x2apic_available(); 87 } 88