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Diffstat (limited to 'arch/s390/include/asm/kvm_para.h')
| -rw-r--r-- | arch/s390/include/asm/kvm_para.h | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/arch/s390/include/asm/kvm_para.h b/arch/s390/include/asm/kvm_para.h new file mode 100644 index 000000000..df73a0527 --- /dev/null +++ b/arch/s390/include/asm/kvm_para.h @@ -0,0 +1,123 @@ +/* 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 */ |