arch/s390/include/asm/kvm_para.h

   1 /*
   2  * 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  * Hypercalls for KVM on s390. The calling convention is similar to the
  14  * s390 ABI, so we use R2-R6 for parameters 1-5. In addition we use R1
  15  * as hypercall number and R7 as parameter 6. The return value is
  16  * written to R2. We use the diagnose instruction as hypercall. To avoid
  17  * conflicts with existing diagnoses for LPAR and z/VM, we do not use
  18  * the instruction encoded number, but specify the number in R1 and
  19  * use 0x500 as KVM hypercall
  20  *
  21  * Copyright IBM Corp. 2007,2008
  22  * Author(s): Christian Borntraeger <borntraeger@de.ibm.com>
  23  *
  24  * This work is licensed under the terms of the GNU GPL, version 2.
  25  */
  26 #ifndef __S390_KVM_PARA_H
  27 #define __S390_KVM_PARA_H
  28
  29 #include <uapi/asm/kvm_para.h>
  30 #include <asm/diag.h>
  31
  32 static inline long __kvm_hypercall0(unsigned long nr)
  33 {
  34         register unsigned long __nr asm("1") = nr;
  35         register long __rc asm("2");
  36
  37         asm volatile ("diag 2,4,0x500\n"
  38                       : "=d" (__rc) : "d" (__nr): "memory", "cc");
  39         return __rc;
  40 }
  41
  42 static inline long kvm_hypercall0(unsigned long nr)
  43 {
  44         diag_stat_inc(DIAG_STAT_X500);
  45         return __kvm_hypercall0(nr);
  46 }
  47
  48 static inline long __kvm_hypercall1(unsigned long nr, unsigned long p1)
  49 {
  50         register unsigned long __nr asm("1") = nr;
  51         register unsigned long __p1 asm("2") = p1;
  52         register long __rc asm("2");
  53
  54         asm volatile ("diag 2,4,0x500\n"
  55                       : "=d" (__rc) : "d" (__nr), "0" (__p1) : "memory", "cc");
  56         return __rc;
  57 }
  58
  59 static inline long kvm_hypercall1(unsigned long nr, unsigned long p1)
  60 {
  61         diag_stat_inc(DIAG_STAT_X500);
  62         return __kvm_hypercall1(nr, p1);
  63 }
  64
  65 static inline long __kvm_hypercall2(unsigned long nr, unsigned long p1,
  66                                unsigned long p2)
  67 {
  68         register unsigned long __nr asm("1") = nr;
  69         register unsigned long __p1 asm("2") = p1;
  70         register unsigned long __p2 asm("3") = p2;
  71         register long __rc asm("2");
  72
  73         asm volatile ("diag 2,4,0x500\n"
  74                       : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2)
  75                       : "memory", "cc");
  76         return __rc;
  77 }
  78
  79 static inline long kvm_hypercall2(unsigned long nr, unsigned long p1,
  80                                unsigned long p2)
  81 {
  82         diag_stat_inc(DIAG_STAT_X500);
  83         return __kvm_hypercall2(nr, p1, p2);
  84 }
  85
  86 static inline long __kvm_hypercall3(unsigned long nr, unsigned long p1,
  87                                unsigned long p2, unsigned long p3)
  88 {
  89         register unsigned long __nr asm("1") = nr;
  90         register unsigned long __p1 asm("2") = p1;
  91         register unsigned long __p2 asm("3") = p2;
  92         register unsigned long __p3 asm("4") = p3;
  93         register long __rc asm("2");
  94
  95         asm volatile ("diag 2,4,0x500\n"
  96                       : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
  97                         "d" (__p3) : "memory", "cc");
  98         return __rc;
  99 }
 100
 101 static inline long kvm_hypercall3(unsigned long nr, unsigned long p1,
 102                                unsigned long p2, unsigned long p3)
 103 {
 104         diag_stat_inc(DIAG_STAT_X500);
 105         return __kvm_hypercall3(nr, p1, p2, p3);
 106 }
 107
 108 static inline long __kvm_hypercall4(unsigned long nr, unsigned long p1,
 109                                unsigned long p2, unsigned long p3,
 110                                unsigned long p4)
 111 {
 112         register unsigned long __nr asm("1") = nr;
 113         register unsigned long __p1 asm("2") = p1;
 114         register unsigned long __p2 asm("3") = p2;
 115         register unsigned long __p3 asm("4") = p3;
 116         register unsigned long __p4 asm("5") = p4;
 117         register long __rc asm("2");
 118
 119         asm volatile ("diag 2,4,0x500\n"
 120                       : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
 121                         "d" (__p3), "d" (__p4) : "memory", "cc");
 122         return __rc;
 123 }
 124
 125 static inline long kvm_hypercall4(unsigned long nr, unsigned long p1,
 126                                unsigned long p2, unsigned long p3,
 127                                unsigned long p4)
 128 {
 129         diag_stat_inc(DIAG_STAT_X500);
 130         return __kvm_hypercall4(nr, p1, p2, p3, p4);
 131 }
 132
 133 static inline long __kvm_hypercall5(unsigned long nr, unsigned long p1,
 134                                unsigned long p2, unsigned long p3,
 135                                unsigned long p4, unsigned long p5)
 136 {
 137         register unsigned long __nr asm("1") = nr;
 138         register unsigned long __p1 asm("2") = p1;
 139         register unsigned long __p2 asm("3") = p2;
 140         register unsigned long __p3 asm("4") = p3;
 141         register unsigned long __p4 asm("5") = p4;
 142         register unsigned long __p5 asm("6") = p5;
 143         register long __rc asm("2");
 144
 145         asm volatile ("diag 2,4,0x500\n"
 146                       : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
 147                         "d" (__p3), "d" (__p4), "d" (__p5)  : "memory", "cc");
 148         return __rc;
 149 }
 150
 151 static inline long kvm_hypercall5(unsigned long nr, unsigned long p1,
 152                                unsigned long p2, unsigned long p3,
 153                                unsigned long p4, unsigned long p5)
 154 {
 155         diag_stat_inc(DIAG_STAT_X500);
 156         return __kvm_hypercall5(nr, p1, p2, p3, p4, p5);
 157 }
 158
 159 static inline long __kvm_hypercall6(unsigned long nr, unsigned long p1,
 160                                unsigned long p2, unsigned long p3,
 161                                unsigned long p4, unsigned long p5,
 162                                unsigned long p6)
 163 {
 164         register unsigned long __nr asm("1") = nr;
 165         register unsigned long __p1 asm("2") = p1;
 166         register unsigned long __p2 asm("3") = p2;
 167         register unsigned long __p3 asm("4") = p3;
 168         register unsigned long __p4 asm("5") = p4;
 169         register unsigned long __p5 asm("6") = p5;
 170         register unsigned long __p6 asm("7") = p6;
 171         register long __rc asm("2");
 172
 173         asm volatile ("diag 2,4,0x500\n"
 174                       : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
 175                         "d" (__p3), "d" (__p4), "d" (__p5), "d" (__p6)
 176                       : "memory", "cc");
 177         return __rc;
 178 }
 179
 180 static inline long kvm_hypercall6(unsigned long nr, unsigned long p1,
 181                                unsigned long p2, unsigned long p3,
 182                                unsigned long p4, unsigned long p5,
 183                                unsigned long p6)
 184 {
 185         diag_stat_inc(DIAG_STAT_X500);
 186         return __kvm_hypercall6(nr, p1, p2, p3, p4, p5, p6);
 187 }
 188
 189 /* kvm on s390 is always paravirtualization enabled */
 190 static inline int kvm_para_available(void)
 191 {
 192         return 1;
 193 }
 194
 195 /* No feature bits are currently assigned for kvm on s390 */
 196 static inline unsigned int kvm_arch_para_features(void)
 197 {
 198         return 0;
 199 }
 200
 201 static inline bool kvm_check_and_clear_guest_paused(void)
 202 {
 203         return false;
 204 }
 205
 206 #endif /* __S390_KVM_PARA_H */