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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 | /* SPDX-License-Identifier: GPL-2.0 */ /* * definition for paravirtual devices on s390 * * Copyright IBM Corp. 2008 * * Author(s): Christian Borntraeger <borntraeger@de.ibm.com> */ /* * Hypercalls for KVM on s390. The calling convention is similar to the * s390 ABI, so we use R2-R6 for parameters 1-5. In addition we use R1 * as hypercall number and R7 as parameter 6. The return value is * written to R2. We use the diagnose instruction as hypercall. To avoid * conflicts with existing diagnoses for LPAR and z/VM, we do not use * the instruction encoded number, but specify the number in R1 and * use 0x500 as KVM hypercall * * Copyright IBM Corp. 2007,2008 * Author(s): Christian Borntraeger <borntraeger@de.ibm.com> */ #ifndef __S390_KVM_PARA_H #define __S390_KVM_PARA_H #include <uapi/asm/kvm_para.h> #include <asm/diag.h> #define HYPERCALL_FMT_0 #define HYPERCALL_FMT_1 , "0" (r2) #define HYPERCALL_FMT_2 , "d" (r3) HYPERCALL_FMT_1 #define HYPERCALL_FMT_3 , "d" (r4) HYPERCALL_FMT_2 #define HYPERCALL_FMT_4 , "d" (r5) HYPERCALL_FMT_3 #define HYPERCALL_FMT_5 , "d" (r6) HYPERCALL_FMT_4 #define HYPERCALL_FMT_6 , "d" (r7) HYPERCALL_FMT_5 #define HYPERCALL_PARM_0 #define HYPERCALL_PARM_1 , unsigned long arg1 #define HYPERCALL_PARM_2 HYPERCALL_PARM_1, unsigned long arg2 #define HYPERCALL_PARM_3 HYPERCALL_PARM_2, unsigned long arg3 #define HYPERCALL_PARM_4 HYPERCALL_PARM_3, unsigned long arg4 #define HYPERCALL_PARM_5 HYPERCALL_PARM_4, unsigned long arg5 #define HYPERCALL_PARM_6 HYPERCALL_PARM_5, unsigned long arg6 #define HYPERCALL_REGS_0 #define HYPERCALL_REGS_1 \ register unsigned long r2 asm("2") = arg1 #define HYPERCALL_REGS_2 \ HYPERCALL_REGS_1; \ register unsigned long r3 asm("3") = arg2 #define HYPERCALL_REGS_3 \ HYPERCALL_REGS_2; \ register unsigned long r4 asm("4") = arg3 #define HYPERCALL_REGS_4 \ HYPERCALL_REGS_3; \ register unsigned long r5 asm("5") = arg4 #define HYPERCALL_REGS_5 \ HYPERCALL_REGS_4; \ register unsigned long r6 asm("6") = arg5 #define HYPERCALL_REGS_6 \ HYPERCALL_REGS_5; \ register unsigned long r7 asm("7") = arg6 #define HYPERCALL_ARGS_0 #define HYPERCALL_ARGS_1 , arg1 #define HYPERCALL_ARGS_2 HYPERCALL_ARGS_1, arg2 #define HYPERCALL_ARGS_3 HYPERCALL_ARGS_2, arg3 #define HYPERCALL_ARGS_4 HYPERCALL_ARGS_3, arg4 #define HYPERCALL_ARGS_5 HYPERCALL_ARGS_4, arg5 #define HYPERCALL_ARGS_6 HYPERCALL_ARGS_5, arg6 #define GENERATE_KVM_HYPERCALL_FUNC(args) \ static inline \ long __kvm_hypercall##args(unsigned long nr HYPERCALL_PARM_##args) \ { \ register unsigned long __nr asm("1") = nr; \ register long __rc asm("2"); \ HYPERCALL_REGS_##args; \ \ asm volatile ( \ " diag 2,4,0x500\n" \ : "=d" (__rc) \ : "d" (__nr) HYPERCALL_FMT_##args \ : "memory", "cc"); \ return __rc; \ } \ \ static inline \ long kvm_hypercall##args(unsigned long nr HYPERCALL_PARM_##args) \ { \ diag_stat_inc(DIAG_STAT_X500); \ return __kvm_hypercall##args(nr HYPERCALL_ARGS_##args); \ } GENERATE_KVM_HYPERCALL_FUNC(0) GENERATE_KVM_HYPERCALL_FUNC(1) GENERATE_KVM_HYPERCALL_FUNC(2) GENERATE_KVM_HYPERCALL_FUNC(3) GENERATE_KVM_HYPERCALL_FUNC(4) GENERATE_KVM_HYPERCALL_FUNC(5) GENERATE_KVM_HYPERCALL_FUNC(6) /* kvm on s390 is always paravirtualization enabled */ static inline int kvm_para_available(void) { return 1; } /* No feature bits are currently assigned for kvm on s390 */ static inline unsigned int kvm_arch_para_features(void) { return 0; } static inline unsigned int kvm_arch_para_hints(void) { return 0; } static inline bool kvm_check_and_clear_guest_paused(void) { return false; } #endif /* __S390_KVM_PARA_H */ |