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

   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#ifdef __KERNEL__
  17
  18/*
  19 * Hypercalls for KVM on s390. The calling convention is similar to the
  20 * s390 ABI, so we use R2-R6 for parameters 1-5. In addition we use R1
  21 * as hypercall number and R7 as parameter 6. The return value is
  22 * written to R2. We use the diagnose instruction as hypercall. To avoid
  23 * conflicts with existing diagnoses for LPAR and z/VM, we do not use
  24 * the instruction encoded number, but specify the number in R1 and
  25 * use 0x500 as KVM hypercall
  26 *
  27 * Copyright IBM Corp. 2007,2008
  28 * Author(s): Christian Borntraeger <borntraeger@de.ibm.com>
  29 *
  30 * This work is licensed under the terms of the GNU GPL, version 2.
  31 */
  32
  33static inline long kvm_hypercall0(unsigned long nr)
  34{
  35        register unsigned long __nr asm("1") = nr;
  36        register long __rc asm("2");
  37
  38        asm volatile ("diag 2,4,0x500\n"
  39                      : "=d" (__rc) : "d" (__nr): "memory", "cc");
  40        return __rc;
  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_hypercall2(unsigned long nr, unsigned long p1,
  55                               unsigned long p2)
  56{
  57        register unsigned long __nr asm("1") = nr;
  58        register unsigned long __p1 asm("2") = p1;
  59        register unsigned long __p2 asm("3") = p2;
  60        register long __rc asm("2");
  61
  62        asm volatile ("diag 2,4,0x500\n"
  63                      : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2)
  64                      : "memory", "cc");
  65        return __rc;
  66}
  67
  68static inline long kvm_hypercall3(unsigned long nr, unsigned long p1,
  69                               unsigned long p2, unsigned long p3)
  70{
  71        register unsigned long __nr asm("1") = nr;
  72        register unsigned long __p1 asm("2") = p1;
  73        register unsigned long __p2 asm("3") = p2;
  74        register unsigned long __p3 asm("4") = p3;
  75        register long __rc asm("2");
  76
  77        asm volatile ("diag 2,4,0x500\n"
  78                      : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
  79                        "d" (__p3) : "memory", "cc");
  80        return __rc;
  81}
  82
  83
  84static inline long kvm_hypercall4(unsigned long nr, unsigned long p1,
  85                               unsigned long p2, unsigned long p3,
  86                               unsigned long p4)
  87{
  88        register unsigned long __nr asm("1") = nr;
  89        register unsigned long __p1 asm("2") = p1;
  90        register unsigned long __p2 asm("3") = p2;
  91        register unsigned long __p3 asm("4") = p3;
  92        register unsigned long __p4 asm("5") = p4;
  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), "d" (__p4) : "memory", "cc");
  98        return __rc;
  99}
 100
 101static inline long kvm_hypercall5(unsigned long nr, unsigned long p1,
 102                               unsigned long p2, unsigned long p3,
 103                               unsigned long p4, unsigned long p5)
 104{
 105        register unsigned long __nr asm("1") = nr;
 106        register unsigned long __p1 asm("2") = p1;
 107        register unsigned long __p2 asm("3") = p2;
 108        register unsigned long __p3 asm("4") = p3;
 109        register unsigned long __p4 asm("5") = p4;
 110        register unsigned long __p5 asm("6") = p5;
 111        register long __rc asm("2");
 112
 113        asm volatile ("diag 2,4,0x500\n"
 114                      : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
 115                        "d" (__p3), "d" (__p4), "d" (__p5)  : "memory", "cc");
 116        return __rc;
 117}
 118
 119static inline long kvm_hypercall6(unsigned long nr, unsigned long p1,
 120                               unsigned long p2, unsigned long p3,
 121                               unsigned long p4, unsigned long p5,
 122                               unsigned long p6)
 123{
 124        register unsigned long __nr asm("1") = nr;
 125        register unsigned long __p1 asm("2") = p1;
 126        register unsigned long __p2 asm("3") = p2;
 127        register unsigned long __p3 asm("4") = p3;
 128        register unsigned long __p4 asm("5") = p4;
 129        register unsigned long __p5 asm("6") = p5;
 130        register unsigned long __p6 asm("7") = p6;
 131        register long __rc asm("2");
 132
 133        asm volatile ("diag 2,4,0x500\n"
 134                      : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
 135                        "d" (__p3), "d" (__p4), "d" (__p5), "d" (__p6)
 136                      : "memory", "cc");
 137        return __rc;
 138}
 139
 140/* kvm on s390 is always paravirtualization enabled */
 141static inline int kvm_para_available(void)
 142{
 143        return 1;
 144}
 145
 146/* No feature bits are currently assigned for kvm on s390 */
 147static inline unsigned int kvm_arch_para_features(void)
 148{
 149        return 0;
 150}
 151
 152#endif
 153
 154#endif /* __S390_KVM_PARA_H */
 155