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/* SPDX-License-Identifier: GPL-2.0 */
/*
* definition for paravirtual devices on s390
*
* Copyright IBM Corp. 2008
*
* Author(s): Christian Borntraeger <[email protected]>
*/
/*
* 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 <[email protected]>
*/
#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 */
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