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/init.h> 25 #include <linux/export.h> 26 #include <asm/processor.h> 27 #include <asm/hypervisor.h> 28 29 static const __initconst struct hypervisor_x86 * const hypervisors[] = 30 { 31 #ifdef CONFIG_XEN 32 &x86_hyper_xen, 33 #endif 34 &x86_hyper_vmware, 35 &x86_hyper_ms_hyperv, 36 #ifdef CONFIG_KVM_GUEST 37 &x86_hyper_kvm, 38 #endif 39 }; 40 41 const struct hypervisor_x86 *x86_hyper; 42 EXPORT_SYMBOL(x86_hyper); 43 44 static inline void __init 45 detect_hypervisor_vendor(void) 46 { 47 const struct hypervisor_x86 *h, * const *p; 48 uint32_t pri, max_pri = 0; 49 50 for (p = hypervisors; p < hypervisors + ARRAY_SIZE(hypervisors); p++) { 51 h = *p; 52 pri = h->detect(); 53 if (pri != 0 && pri > max_pri) { 54 max_pri = pri; 55 x86_hyper = h; 56 } 57 } 58 59 if (max_pri) 60 pr_info("Hypervisor detected: %s\n", x86_hyper->name); 61 } 62 63 void init_hypervisor(struct cpuinfo_x86 *c) 64 { 65 if (x86_hyper && x86_hyper->set_cpu_features) 66 x86_hyper->set_cpu_features(c); 67 } 68 69 void __init init_hypervisor_platform(void) 70 { 71 72 detect_hypervisor_vendor(); 73 74 if (!x86_hyper) 75 return; 76 77 init_hypervisor(&boot_cpu_data); 78 79 if (x86_hyper->init_platform) 80 x86_hyper->init_platform(); 81 } 82 83 bool __init hypervisor_x2apic_available(void) 84 { 85 return x86_hyper && 86 x86_hyper->x2apic_available && 87 x86_hyper->x2apic_available(); 88 } 89