124 lines
3.7 KiB
C
124 lines
3.7 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* definition for paravirtual devices on s390
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*
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* Copyright IBM Corp. 2008
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*
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* Author(s): Christian Borntraeger <borntraeger@de.ibm.com>
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*/
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/*
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* Hypercalls for KVM on s390. The calling convention is similar to the
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* s390 ABI, so we use R2-R6 for parameters 1-5. In addition we use R1
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* as hypercall number and R7 as parameter 6. The return value is
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* written to R2. We use the diagnose instruction as hypercall. To avoid
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* conflicts with existing diagnoses for LPAR and z/VM, we do not use
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* the instruction encoded number, but specify the number in R1 and
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* use 0x500 as KVM hypercall
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*
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* Copyright IBM Corp. 2007,2008
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* Author(s): Christian Borntraeger <borntraeger@de.ibm.com>
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*/
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#ifndef __S390_KVM_PARA_H
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#define __S390_KVM_PARA_H
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#include <uapi/asm/kvm_para.h>
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#include <asm/diag.h>
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#define HYPERCALL_FMT_0
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#define HYPERCALL_FMT_1 , "0" (r2)
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#define HYPERCALL_FMT_2 , "d" (r3) HYPERCALL_FMT_1
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#define HYPERCALL_FMT_3 , "d" (r4) HYPERCALL_FMT_2
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#define HYPERCALL_FMT_4 , "d" (r5) HYPERCALL_FMT_3
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#define HYPERCALL_FMT_5 , "d" (r6) HYPERCALL_FMT_4
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#define HYPERCALL_FMT_6 , "d" (r7) HYPERCALL_FMT_5
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#define HYPERCALL_PARM_0
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#define HYPERCALL_PARM_1 , unsigned long arg1
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#define HYPERCALL_PARM_2 HYPERCALL_PARM_1, unsigned long arg2
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#define HYPERCALL_PARM_3 HYPERCALL_PARM_2, unsigned long arg3
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#define HYPERCALL_PARM_4 HYPERCALL_PARM_3, unsigned long arg4
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#define HYPERCALL_PARM_5 HYPERCALL_PARM_4, unsigned long arg5
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#define HYPERCALL_PARM_6 HYPERCALL_PARM_5, unsigned long arg6
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#define HYPERCALL_REGS_0
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#define HYPERCALL_REGS_1 \
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register unsigned long r2 asm("2") = arg1
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#define HYPERCALL_REGS_2 \
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HYPERCALL_REGS_1; \
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register unsigned long r3 asm("3") = arg2
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#define HYPERCALL_REGS_3 \
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HYPERCALL_REGS_2; \
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register unsigned long r4 asm("4") = arg3
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#define HYPERCALL_REGS_4 \
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HYPERCALL_REGS_3; \
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register unsigned long r5 asm("5") = arg4
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#define HYPERCALL_REGS_5 \
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HYPERCALL_REGS_4; \
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register unsigned long r6 asm("6") = arg5
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#define HYPERCALL_REGS_6 \
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HYPERCALL_REGS_5; \
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register unsigned long r7 asm("7") = arg6
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#define HYPERCALL_ARGS_0
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#define HYPERCALL_ARGS_1 , arg1
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#define HYPERCALL_ARGS_2 HYPERCALL_ARGS_1, arg2
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#define HYPERCALL_ARGS_3 HYPERCALL_ARGS_2, arg3
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#define HYPERCALL_ARGS_4 HYPERCALL_ARGS_3, arg4
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#define HYPERCALL_ARGS_5 HYPERCALL_ARGS_4, arg5
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#define HYPERCALL_ARGS_6 HYPERCALL_ARGS_5, arg6
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#define GENERATE_KVM_HYPERCALL_FUNC(args) \
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static inline \
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long __kvm_hypercall##args(unsigned long nr HYPERCALL_PARM_##args) \
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{ \
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register unsigned long __nr asm("1") = nr; \
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register long __rc asm("2"); \
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HYPERCALL_REGS_##args; \
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\
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asm volatile ( \
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" diag 2,4,0x500\n" \
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: "=d" (__rc) \
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: "d" (__nr) HYPERCALL_FMT_##args \
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: "memory", "cc"); \
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return __rc; \
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} \
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\
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static inline \
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long kvm_hypercall##args(unsigned long nr HYPERCALL_PARM_##args) \
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{ \
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diag_stat_inc(DIAG_STAT_X500); \
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return __kvm_hypercall##args(nr HYPERCALL_ARGS_##args); \
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}
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GENERATE_KVM_HYPERCALL_FUNC(0)
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GENERATE_KVM_HYPERCALL_FUNC(1)
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GENERATE_KVM_HYPERCALL_FUNC(2)
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GENERATE_KVM_HYPERCALL_FUNC(3)
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GENERATE_KVM_HYPERCALL_FUNC(4)
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GENERATE_KVM_HYPERCALL_FUNC(5)
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GENERATE_KVM_HYPERCALL_FUNC(6)
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/* kvm on s390 is always paravirtualization enabled */
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static inline int kvm_para_available(void)
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{
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return 1;
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}
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/* No feature bits are currently assigned for kvm on s390 */
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static inline unsigned int kvm_arch_para_features(void)
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{
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return 0;
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}
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static inline unsigned int kvm_arch_para_hints(void)
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{
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return 0;
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}
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static inline bool kvm_check_and_clear_guest_paused(void)
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{
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return false;
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}
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#endif /* __S390_KVM_PARA_H */
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