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0d6d75d2a2
Generate kvm hypercall functions with a macro instead of duplicating the more or less identical code seven times. This also reduces number of lines of code. However the main purpose is to get rid of as many as possible open coded error prone register asm constructs in s390 architecture code. For the only user of kvm_hypercall identical code is created before/after this patch (drivers/s390/virtio/virtio_ccw.c). Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Link: https://lore.kernel.org/r/20210713145713.2815167-1-hca@linux.ibm.com Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
123 lines
3.7 KiB
C
123 lines
3.7 KiB
C
/* 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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