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_PV 32 &x86_hyper_xen_pv, 33 #endif 34 #ifdef CONFIG_XEN_PVHVM 35 &x86_hyper_xen_hvm, 36 #endif 37 &x86_hyper_vmware, 38 &x86_hyper_ms_hyperv, 39 #ifdef CONFIG_KVM_GUEST 40 &x86_hyper_kvm, 41 #endif 42 #ifdef CONFIG_JAILHOUSE_GUEST 43 &x86_hyper_jailhouse, 44 #endif 45 #ifdef CONFIG_ACRN_GUEST 46 &x86_hyper_acrn, 47 #endif 48 }; 49 50 enum x86_hypervisor_type x86_hyper_type; 51 EXPORT_SYMBOL(x86_hyper_type); 52 53 bool __initdata nopv; 54 static __init int parse_nopv(char *arg) 55 { 56 nopv = true; 57 return 0; 58 } 59 early_param("nopv", parse_nopv); 60 61 static inline const struct hypervisor_x86 * __init 62 detect_hypervisor_vendor(void) 63 { 64 const struct hypervisor_x86 *h = NULL, * const *p; 65 uint32_t pri, max_pri = 0; 66 67 for (p = hypervisors; p < hypervisors + ARRAY_SIZE(hypervisors); p++) { 68 if (unlikely(nopv) && !(*p)->ignore_nopv) 69 continue; 70 71 pri = (*p)->detect(); 72 if (pri > max_pri) { 73 max_pri = pri; 74 h = *p; 75 } 76 } 77 78 if (h) 79 pr_info("Hypervisor detected: %s\n", h->name); 80 81 return h; 82 } 83 84 static void __init copy_array(const void *src, void *target, unsigned int size) 85 { 86 unsigned int i, n = size / sizeof(void *); 87 const void * const *from = (const void * const *)src; 88 const void **to = (const void **)target; 89 90 for (i = 0; i < n; i++) 91 if (from[i]) 92 to[i] = from[i]; 93 } 94 95 void __init init_hypervisor_platform(void) 96 { 97 const struct hypervisor_x86 *h; 98 99 h = detect_hypervisor_vendor(); 100 101 if (!h) 102 return; 103 104 copy_array(&h->init, &x86_init.hyper, sizeof(h->init)); 105 copy_array(&h->runtime, &x86_platform.hyper, sizeof(h->runtime)); 106 107 x86_hyper_type = h->type; 108 x86_init.hyper.init_platform(); 109 } 110