LXR linux/arch/s390/include/asm/kvm

   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
  27static 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
  37static inline long kvm_hypercall0(unsigned long nr)
  38{
  39        diag_stat_inc(DIAG_STAT_X500);
  40        return __kvm_hypercall0(nr);
  41}
  42
  43static 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
  54static 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
  60static 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
  74static 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
  81static 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
  96static 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
 103static 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
 120static 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
 128static 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
 146static 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
 154static 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
 175static 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 */
 185static inline int kvm_para_available(void)
 186{
 187        return 1;
 188}
 189
 190/* No feature bits are currently assigned for kvm on s390 */
 191static inline unsigned int kvm_arch_para_features(void)
 192{
 193        return 0;
 194}
 195
 196static inline unsigned int kvm_arch_para_hints(void)
 197{
 198        return 0;
 199}
 200
 201static inline bool kvm_check_and_clear_guest_paused(void)
 202{
 203        return false;
 204}
 205
 206#endif /* __S390_KVM_PARA_H */
 207