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123 lines
3.7 KiB
123 lines
3.7 KiB
/* 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 <[email protected]> |
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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 <[email protected]> |
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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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