arch/s390/include/asm/kvm_para.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * definition for paravirtual devices on s390
   4  *
   5  * Copyright IBM Corp. 2008
   6  *
   7  *    Author(s): Christian Borntraeger <borntraeger@de.ibm.com>
   8  */
   9 /*
  10  * Hypercalls for KVM on s390. The calling convention is similar to the
  11  * s390 ABI, so we use R2-R6 for parameters 1-5. In addition we use R1
  12  * as hypercall number and R7 as parameter 6. The return value is
  13  * written to R2. We use the diagnose instruction as hypercall. To avoid
  14  * conflicts with existing diagnoses for LPAR and z/VM, we do not use
  15  * the instruction encoded number, but specify the number in R1 and
  16  * use 0x500 as KVM hypercall
  17  *
  18  * Copyright IBM Corp. 2007,2008
  19  * Author(s): Christian Borntraeger <borntraeger@de.ibm.com>
  20  */
  21 #ifndef __S390_KVM_PARA_H
  22 #define __S390_KVM_PARA_H
  23
  24 #include <uapi/asm/kvm_para.h>
  25 #include <asm/diag.h>
  26
  27 static inline long __kvm_hypercall0(unsigned long nr)
  28 {
  29         register unsigned long __nr asm("1") = nr;
  30         register long __rc asm("2");
  31
  32         asm volatile ("diag 2,4,0x500\n"
  33                       : "=d" (__rc) : "d" (__nr): "memory", "cc");
  34         return __rc;
  35 }
  36
  37 static inline long kvm_hypercall0(unsigned long nr)
  38 {
  39         diag_stat_inc(DIAG_STAT_X500);
  40         return __kvm_hypercall0(nr);
  41 }
  42
  43 static inline long __kvm_hypercall1(unsigned long nr, unsigned long p1)
  44 {
  45         register unsigned long __nr asm("1") = nr;
  46         register unsigned long __p1 asm("2") = p1;
  47         register long __rc asm("2");
  48
  49         asm volatile ("diag 2,4,0x500\n"
  50                       : "=d" (__rc) : "d" (__nr), "0" (__p1) : "memory", "cc");
  51         return __rc;
  52 }
  53
  54 static inline long kvm_hypercall1(unsigned long nr, unsigned long p1)
  55 {
  56         diag_stat_inc(DIAG_STAT_X500);
  57         return __kvm_hypercall1(nr, p1);
  58 }
  59
  60 static inline long __kvm_hypercall2(unsigned long nr, unsigned long p1,
  61                                unsigned long p2)
  62 {
  63         register unsigned long __nr asm("1") = nr;
  64         register unsigned long __p1 asm("2") = p1;
  65         register unsigned long __p2 asm("3") = p2;
  66         register long __rc asm("2");
  67
  68         asm volatile ("diag 2,4,0x500\n"
  69                       : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2)
  70                       : "memory", "cc");
  71         return __rc;
  72 }
  73
  74 static inline long kvm_hypercall2(unsigned long nr, unsigned long p1,
  75                                unsigned long p2)
  76 {
  77         diag_stat_inc(DIAG_STAT_X500);
  78         return __kvm_hypercall2(nr, p1, p2);
  79 }
  80
  81 static inline long __kvm_hypercall3(unsigned long nr, unsigned long p1,
  82                                unsigned long p2, unsigned long p3)
  83 {
  84         register unsigned long __nr asm("1") = nr;
  85         register unsigned long __p1 asm("2") = p1;
  86         register unsigned long __p2 asm("3") = p2;
  87         register unsigned long __p3 asm("4") = p3;
  88         register long __rc asm("2");
  89
  90         asm volatile ("diag 2,4,0x500\n"
  91                       : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
  92                         "d" (__p3) : "memory", "cc");
  93         return __rc;
  94 }
  95
  96 static inline long kvm_hypercall3(unsigned long nr, unsigned long p1,
  97                                unsigned long p2, unsigned long p3)
  98 {
  99         diag_stat_inc(DIAG_STAT_X500);
 100         return __kvm_hypercall3(nr, p1, p2, p3);
 101 }
 102
 103 static inline long __kvm_hypercall4(unsigned long nr, unsigned long p1,
 104                                unsigned long p2, unsigned long p3,
 105                                unsigned long p4)
 106 {
 107         register unsigned long __nr asm("1") = nr;
 108         register unsigned long __p1 asm("2") = p1;
 109         register unsigned long __p2 asm("3") = p2;
 110         register unsigned long __p3 asm("4") = p3;
 111         register unsigned long __p4 asm("5") = p4;
 112         register long __rc asm("2");
 113
 114         asm volatile ("diag 2,4,0x500\n"
 115                       : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
 116                         "d" (__p3), "d" (__p4) : "memory", "cc");
 117         return __rc;
 118 }
 119
 120 static inline long kvm_hypercall4(unsigned long nr, unsigned long p1,
 121                                unsigned long p2, unsigned long p3,
 122                                unsigned long p4)
 123 {
 124         diag_stat_inc(DIAG_STAT_X500);
 125         return __kvm_hypercall4(nr, p1, p2, p3, p4);
 126 }
 127
 128 static inline long __kvm_hypercall5(unsigned long nr, unsigned long p1,
 129                                unsigned long p2, unsigned long p3,
 130                                unsigned long p4, unsigned long p5)
 131 {
 132         register unsigned long __nr asm("1") = nr;
 133         register unsigned long __p1 asm("2") = p1;
 134         register unsigned long __p2 asm("3") = p2;
 135         register unsigned long __p3 asm("4") = p3;
 136         register unsigned long __p4 asm("5") = p4;
 137         register unsigned long __p5 asm("6") = p5;
 138         register long __rc asm("2");
 139
 140         asm volatile ("diag 2,4,0x500\n"
 141                       : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
 142                         "d" (__p3), "d" (__p4), "d" (__p5)  : "memory", "cc");
 143         return __rc;
 144 }
 145
 146 static inline long kvm_hypercall5(unsigned long nr, unsigned long p1,
 147                                unsigned long p2, unsigned long p3,
 148                                unsigned long p4, unsigned long p5)
 149 {
 150         diag_stat_inc(DIAG_STAT_X500);
 151         return __kvm_hypercall5(nr, p1, p2, p3, p4, p5);
 152 }
 153
 154 static inline long __kvm_hypercall6(unsigned long nr, unsigned long p1,
 155                                unsigned long p2, unsigned long p3,
 156                                unsigned long p4, unsigned long p5,
 157                                unsigned long p6)
 158 {
 159         register unsigned long __nr asm("1") = nr;
 160         register unsigned long __p1 asm("2") = p1;
 161         register unsigned long __p2 asm("3") = p2;
 162         register unsigned long __p3 asm("4") = p3;
 163         register unsigned long __p4 asm("5") = p4;
 164         register unsigned long __p5 asm("6") = p5;
 165         register unsigned long __p6 asm("7") = p6;
 166         register long __rc asm("2");
 167
 168         asm volatile ("diag 2,4,0x500\n"
 169                       : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
 170                         "d" (__p3), "d" (__p4), "d" (__p5), "d" (__p6)
 171                       : "memory", "cc");
 172         return __rc;
 173 }
 174
 175 static inline long kvm_hypercall6(unsigned long nr, unsigned long p1,
 176                                unsigned long p2, unsigned long p3,
 177                                unsigned long p4, unsigned long p5,
 178                                unsigned long p6)
 179 {
 180         diag_stat_inc(DIAG_STAT_X500);
 181         return __kvm_hypercall6(nr, p1, p2, p3, p4, p5, p6);
 182 }
 183
 184 /* kvm on s390 is always paravirtualization enabled */
 185 static inline int kvm_para_available(void)
 186 {
 187         return 1;
 188 }
 189
 190 /* No feature bits are currently assigned for kvm on s390 */
 191 static inline unsigned int kvm_arch_para_features(void)
 192 {
 193         return 0;
 194 }
 195
 196 static inline unsigned int kvm_arch_para_hints(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 */