1 /* 2 * asm-s390/kvm_para.h - definition for paravirtual devices on s390 3 * 4 * Copyright IBM Corp. 2008 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License (version 2 only) 8 * as published by the Free Software Foundation. 9 * 10 * Author(s): Christian Borntraeger <borntraeger@de.ibm.com> 11 */ 12 13 #ifndef __S390_KVM_PARA_H 14 #define __S390_KVM_PARA_H 15 16 /* 17 * Hypercalls for KVM on s390. The calling convention is similar to the 18 * s390 ABI, so we use R2-R6 for parameters 1-5. In addition we use R1 19 * as hypercall number and R7 as parameter 6. The return value is 20 * written to R2. We use the diagnose instruction as hypercall. To avoid 21 * conflicts with existing diagnoses for LPAR and z/VM, we do not use 22 * the instruction encoded number, but specify the number in R1 and 23 * use 0x500 as KVM hypercall 24 * 25 * Copyright IBM Corp. 2007,2008 26 * Author(s): Christian Borntraeger <borntraeger@de.ibm.com> 27 * 28 * This work is licensed under the terms of the GNU GPL, version 2. 29 */ 30 31 static inline long kvm_hypercall0(unsigned long nr) 32 { 33 register unsigned long __nr asm("1") = nr; 34 register long __rc asm("2"); 35 36 asm volatile ("diag 2,4,0x500\n" 37 : "=d" (__rc) : "d" (__nr): "memory", "cc"); 38 return __rc; 39 } 40 41 static inline long kvm_hypercall1(unsigned long nr, unsigned long p1) 42 { 43 register unsigned long __nr asm("1") = nr; 44 register unsigned long __p1 asm("2") = p1; 45 register long __rc asm("2"); 46 47 asm volatile ("diag 2,4,0x500\n" 48 : "=d" (__rc) : "d" (__nr), "0" (__p1) : "memory", "cc"); 49 return __rc; 50 } 51 52 static inline long kvm_hypercall2(unsigned long nr, unsigned long p1, 53 unsigned long p2) 54 { 55 register unsigned long __nr asm("1") = nr; 56 register unsigned long __p1 asm("2") = p1; 57 register unsigned long __p2 asm("3") = p2; 58 register long __rc asm("2"); 59 60 asm volatile ("diag 2,4,0x500\n" 61 : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2) 62 : "memory", "cc"); 63 return __rc; 64 } 65 66 static inline long kvm_hypercall3(unsigned long nr, unsigned long p1, 67 unsigned long p2, unsigned long p3) 68 { 69 register unsigned long __nr asm("1") = nr; 70 register unsigned long __p1 asm("2") = p1; 71 register unsigned long __p2 asm("3") = p2; 72 register unsigned long __p3 asm("4") = p3; 73 register long __rc asm("2"); 74 75 asm volatile ("diag 2,4,0x500\n" 76 : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2), 77 "d" (__p3) : "memory", "cc"); 78 return __rc; 79 } 80 81 82 static inline long kvm_hypercall4(unsigned long nr, unsigned long p1, 83 unsigned long p2, unsigned long p3, 84 unsigned long p4) 85 { 86 register unsigned long __nr asm("1") = nr; 87 register unsigned long __p1 asm("2") = p1; 88 register unsigned long __p2 asm("3") = p2; 89 register unsigned long __p3 asm("4") = p3; 90 register unsigned long __p4 asm("5") = p4; 91 register long __rc asm("2"); 92 93 asm volatile ("diag 2,4,0x500\n" 94 : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2), 95 "d" (__p3), "d" (__p4) : "memory", "cc"); 96 return __rc; 97 } 98 99 static inline long kvm_hypercall5(unsigned long nr, unsigned long p1, 100 unsigned long p2, unsigned long p3, 101 unsigned long p4, unsigned long p5) 102 { 103 register unsigned long __nr asm("1") = nr; 104 register unsigned long __p1 asm("2") = p1; 105 register unsigned long __p2 asm("3") = p2; 106 register unsigned long __p3 asm("4") = p3; 107 register unsigned long __p4 asm("5") = p4; 108 register unsigned long __p5 asm("6") = p5; 109 register long __rc asm("2"); 110 111 asm volatile ("diag 2,4,0x500\n" 112 : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2), 113 "d" (__p3), "d" (__p4), "d" (__p5) : "memory", "cc"); 114 return __rc; 115 } 116 117 static inline long kvm_hypercall6(unsigned long nr, unsigned long p1, 118 unsigned long p2, unsigned long p3, 119 unsigned long p4, unsigned long p5, 120 unsigned long p6) 121 { 122 register unsigned long __nr asm("1") = nr; 123 register unsigned long __p1 asm("2") = p1; 124 register unsigned long __p2 asm("3") = p2; 125 register unsigned long __p3 asm("4") = p3; 126 register unsigned long __p4 asm("5") = p4; 127 register unsigned long __p5 asm("6") = p5; 128 register unsigned long __p6 asm("7") = p6; 129 register long __rc asm("2"); 130 131 asm volatile ("diag 2,4,0x500\n" 132 : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2), 133 "d" (__p3), "d" (__p4), "d" (__p5), "d" (__p6) 134 : "memory", "cc"); 135 return __rc; 136 } 137 138 /* kvm on s390 is always paravirtualization enabled */ 139 static inline int kvm_para_available(void) 140 { 141 return 1; 142 } 143 144 /* No feature bits are currently assigned for kvm on s390 */ 145 static inline unsigned int kvm_arch_para_features(void) 146 { 147 return 0; 148 } 149 150 #endif /* __S390_KVM_PARA_H */ 151