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 }; 43 44 const struct hypervisor_x86 *x86_hyper; 45 EXPORT_SYMBOL(x86_hyper); 46 47 static inline void __init 48 detect_hypervisor_vendor(void) 49 { 50 const struct hypervisor_x86 *h, * const *p; 51 uint32_t pri, max_pri = 0; 52 53 for (p = hypervisors; p < hypervisors + ARRAY_SIZE(hypervisors); p++) { 54 h = *p; 55 pri = h->detect(); 56 if (pri != 0 && pri > max_pri) { 57 max_pri = pri; 58 x86_hyper = h; 59 } 60 } 61 62 if (max_pri) 63 pr_info("Hypervisor detected: %s\n", x86_hyper->name); 64 } 65 66 void __init init_hypervisor_platform(void) 67 { 68 69 detect_hypervisor_vendor(); 70 71 if (!x86_hyper) 72 return; 73 74 if (x86_hyper->init_platform) 75 x86_hyper->init_platform(); 76 } 77 78 bool __init hypervisor_x2apic_available(void) 79 { 80 return x86_hyper && 81 x86_hyper->x2apic_available && 82 x86_hyper->x2apic_available(); 83 } 84 85 void hypervisor_pin_vcpu(int cpu) 86 { 87 if (!x86_hyper) 88 return; 89 90 if (x86_hyper->pin_vcpu) 91 x86_hyper->pin_vcpu(cpu); 92 else 93 WARN_ONCE(1, "vcpu pinning requested but not supported!\n"); 94 } 95