1 /* 2 * This program is free software; you can redistribute it and/or modify 3 * it under the terms of the GNU General Public License, version 2, as 4 * published by the Free Software Foundation. 5 * 6 * This program is distributed in the hope that it will be useful, 7 * but WITHOUT ANY WARRANTY; without even the implied warranty of 8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 9 * GNU General Public License for more details. 10 * 11 * You should have received a copy of the GNU General Public License 12 * along with this program; if not, write to the Free Software 13 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 14 * 15 * Copyright IBM Corp. 2008 16 * 17 * Authors: Hollis Blanchard <hollisb@us.ibm.com> 18 */ 19 20 #ifndef __POWERPC_KVM_PARA_H__ 21 #define __POWERPC_KVM_PARA_H__ 22 23 #include <linux/types.h> 24 25 struct kvm_vcpu_arch_shared { 26 __u64 scratch1; 27 __u64 scratch2; 28 __u64 scratch3; 29 __u64 critical; /* Guest may not get interrupts if == r1 */ 30 __u64 sprg0; 31 __u64 sprg1; 32 __u64 sprg2; 33 __u64 sprg3; 34 __u64 srr0; 35 __u64 srr1; 36 __u64 dar; 37 __u64 msr; 38 __u32 dsisr; 39 __u32 int_pending; /* Tells the guest if we have an interrupt */ 40 __u32 sr[16]; 41 }; 42 43 #define KVM_SC_MAGIC_R0 0x4b564d21 /* "KVM!" */ 44 #define HC_VENDOR_KVM (42 << 16) 45 #define HC_EV_SUCCESS 0 46 #define HC_EV_UNIMPLEMENTED 12 47 48 #define KVM_FEATURE_MAGIC_PAGE 1 49 50 #define KVM_MAGIC_FEAT_SR (1 << 0) 51 52 #ifdef __KERNEL__ 53 54 #ifdef CONFIG_KVM_GUEST 55 56 #include <linux/of.h> 57 58 static inline int kvm_para_available(void) 59 { 60 struct device_node *hyper_node; 61 62 hyper_node = of_find_node_by_path("/hypervisor"); 63 if (!hyper_node) 64 return 0; 65 66 if (!of_device_is_compatible(hyper_node, "linux,kvm")) 67 return 0; 68 69 return 1; 70 } 71 72 extern unsigned long kvm_hypercall(unsigned long *in, 73 unsigned long *out, 74 unsigned long nr); 75 76 #else 77 78 static inline int kvm_para_available(void) 79 { 80 return 0; 81 } 82 83 static unsigned long kvm_hypercall(unsigned long *in, 84 unsigned long *out, 85 unsigned long nr) 86 { 87 return HC_EV_UNIMPLEMENTED; 88 } 89 90 #endif 91 92 static inline long kvm_hypercall0_1(unsigned int nr, unsigned long *r2) 93 { 94 unsigned long in[8]; 95 unsigned long out[8]; 96 unsigned long r; 97 98 r = kvm_hypercall(in, out, nr | HC_VENDOR_KVM); 99 *r2 = out[0]; 100 101 return r; 102 } 103 104 static inline long kvm_hypercall0(unsigned int nr) 105 { 106 unsigned long in[8]; 107 unsigned long out[8]; 108 109 return kvm_hypercall(in, out, nr | HC_VENDOR_KVM); 110 } 111 112 static inline long kvm_hypercall1(unsigned int nr, unsigned long p1) 113 { 114 unsigned long in[8]; 115 unsigned long out[8]; 116 117 in[0] = p1; 118 return kvm_hypercall(in, out, nr | HC_VENDOR_KVM); 119 } 120 121 static inline long kvm_hypercall2(unsigned int nr, unsigned long p1, 122 unsigned long p2) 123 { 124 unsigned long in[8]; 125 unsigned long out[8]; 126 127 in[0] = p1; 128 in[1] = p2; 129 return kvm_hypercall(in, out, nr | HC_VENDOR_KVM); 130 } 131 132 static inline long kvm_hypercall3(unsigned int nr, unsigned long p1, 133 unsigned long p2, unsigned long p3) 134 { 135 unsigned long in[8]; 136 unsigned long out[8]; 137 138 in[0] = p1; 139 in[1] = p2; 140 in[2] = p3; 141 return kvm_hypercall(in, out, nr | HC_VENDOR_KVM); 142 } 143 144 static inline long kvm_hypercall4(unsigned int nr, unsigned long p1, 145 unsigned long p2, unsigned long p3, 146 unsigned long p4) 147 { 148 unsigned long in[8]; 149 unsigned long out[8]; 150 151 in[0] = p1; 152 in[1] = p2; 153 in[2] = p3; 154 in[3] = p4; 155 return kvm_hypercall(in, out, nr | HC_VENDOR_KVM); 156 } 157 158 159 static inline unsigned int kvm_arch_para_features(void) 160 { 161 unsigned long r; 162 163 if (!kvm_para_available()) 164 return 0; 165 166 if(kvm_hypercall0_1(KVM_HC_FEATURES, &r)) 167 return 0; 168 169 return r; 170 } 171 172 #endif /* __KERNEL__ */ 173 174 #endif /* __POWERPC_KVM_PARA_H__ */ 175