1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * definition for paravirtual devices on s390
4 *
5 * Copyright IBM Corp. 2008
6 *
7 *    Author(s): Christian Borntraeger <borntraeger@de.ibm.com>
8 */
9/*
10 * Hypercalls for KVM on s390. The calling convention is similar to the
11 * s390 ABI, so we use R2-R6 for parameters 1-5. In addition we use R1
12 * as hypercall number and R7 as parameter 6. The return value is
13 * written to R2. We use the diagnose instruction as hypercall. To avoid
14 * conflicts with existing diagnoses for LPAR and z/VM, we do not use
15 * the instruction encoded number, but specify the number in R1 and
16 * use 0x500 as KVM hypercall
17 *
18 * Copyright IBM Corp. 2007,2008
19 * Author(s): Christian Borntraeger <borntraeger@de.ibm.com>
20 */
21#ifndef __S390_KVM_PARA_H
22#define __S390_KVM_PARA_H
23
24#include <uapi/asm/kvm_para.h>
25#include <asm/diag.h>
26
27static inline long __kvm_hypercall0(unsigned long nr)
28{
29	register unsigned long __nr asm("1") = nr;
30	register long __rc asm("2");
31
32	asm volatile ("diag 2,4,0x500\n"
33		      : "=d" (__rc) : "d" (__nr): "memory", "cc");
34	return __rc;
35}
36
37static inline long kvm_hypercall0(unsigned long nr)
38{
39	diag_stat_inc(DIAG_STAT_X500);
40	return __kvm_hypercall0(nr);
41}
42
43static inline long __kvm_hypercall1(unsigned long nr, unsigned long p1)
44{
45	register unsigned long __nr asm("1") = nr;
46	register unsigned long __p1 asm("2") = p1;
47	register long __rc asm("2");
48
49	asm volatile ("diag 2,4,0x500\n"
50		      : "=d" (__rc) : "d" (__nr), "0" (__p1) : "memory", "cc");
51	return __rc;
52}
53
54static inline long kvm_hypercall1(unsigned long nr, unsigned long p1)
55{
56	diag_stat_inc(DIAG_STAT_X500);
57	return __kvm_hypercall1(nr, p1);
58}
59
60static inline long __kvm_hypercall2(unsigned long nr, unsigned long p1,
61			       unsigned long p2)
62{
63	register unsigned long __nr asm("1") = nr;
64	register unsigned long __p1 asm("2") = p1;
65	register unsigned long __p2 asm("3") = p2;
66	register long __rc asm("2");
67
68	asm volatile ("diag 2,4,0x500\n"
69		      : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2)
70		      : "memory", "cc");
71	return __rc;
72}
73
74static inline long kvm_hypercall2(unsigned long nr, unsigned long p1,
75			       unsigned long p2)
76{
77	diag_stat_inc(DIAG_STAT_X500);
78	return __kvm_hypercall2(nr, p1, p2);
79}
80
81static inline long __kvm_hypercall3(unsigned long nr, unsigned long p1,
82			       unsigned long p2, unsigned long p3)
83{
84	register unsigned long __nr asm("1") = nr;
85	register unsigned long __p1 asm("2") = p1;
86	register unsigned long __p2 asm("3") = p2;
87	register unsigned long __p3 asm("4") = p3;
88	register long __rc asm("2");
89
90	asm volatile ("diag 2,4,0x500\n"
91		      : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
92			"d" (__p3) : "memory", "cc");
93	return __rc;
94}
95
96static inline long kvm_hypercall3(unsigned long nr, unsigned long p1,
97			       unsigned long p2, unsigned long p3)
98{
99	diag_stat_inc(DIAG_STAT_X500);
100	return __kvm_hypercall3(nr, p1, p2, p3);
101}
102
103static inline long __kvm_hypercall4(unsigned long nr, unsigned long p1,
104			       unsigned long p2, unsigned long p3,
105			       unsigned long p4)
106{
107	register unsigned long __nr asm("1") = nr;
108	register unsigned long __p1 asm("2") = p1;
109	register unsigned long __p2 asm("3") = p2;
110	register unsigned long __p3 asm("4") = p3;
111	register unsigned long __p4 asm("5") = p4;
112	register long __rc asm("2");
113
114	asm volatile ("diag 2,4,0x500\n"
115		      : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
116			"d" (__p3), "d" (__p4) : "memory", "cc");
117	return __rc;
118}
119
120static inline long kvm_hypercall4(unsigned long nr, unsigned long p1,
121			       unsigned long p2, unsigned long p3,
122			       unsigned long p4)
123{
124	diag_stat_inc(DIAG_STAT_X500);
125	return __kvm_hypercall4(nr, p1, p2, p3, p4);
126}
127
128static inline long __kvm_hypercall5(unsigned long nr, unsigned long p1,
129			       unsigned long p2, unsigned long p3,
130			       unsigned long p4, unsigned long p5)
131{
132	register unsigned long __nr asm("1") = nr;
133	register unsigned long __p1 asm("2") = p1;
134	register unsigned long __p2 asm("3") = p2;
135	register unsigned long __p3 asm("4") = p3;
136	register unsigned long __p4 asm("5") = p4;
137	register unsigned long __p5 asm("6") = p5;
138	register long __rc asm("2");
139
140	asm volatile ("diag 2,4,0x500\n"
141		      : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
142			"d" (__p3), "d" (__p4), "d" (__p5)  : "memory", "cc");
143	return __rc;
144}
145
146static inline long kvm_hypercall5(unsigned long nr, unsigned long p1,
147			       unsigned long p2, unsigned long p3,
148			       unsigned long p4, unsigned long p5)
149{
150	diag_stat_inc(DIAG_STAT_X500);
151	return __kvm_hypercall5(nr, p1, p2, p3, p4, p5);
152}
153
154static inline long __kvm_hypercall6(unsigned long nr, unsigned long p1,
155			       unsigned long p2, unsigned long p3,
156			       unsigned long p4, unsigned long p5,
157			       unsigned long p6)
158{
159	register unsigned long __nr asm("1") = nr;
160	register unsigned long __p1 asm("2") = p1;
161	register unsigned long __p2 asm("3") = p2;
162	register unsigned long __p3 asm("4") = p3;
163	register unsigned long __p4 asm("5") = p4;
164	register unsigned long __p5 asm("6") = p5;
165	register unsigned long __p6 asm("7") = p6;
166	register long __rc asm("2");
167
168	asm volatile ("diag 2,4,0x500\n"
169		      : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
170			"d" (__p3), "d" (__p4), "d" (__p5), "d" (__p6)
171		      : "memory", "cc");
172	return __rc;
173}
174
175static inline long kvm_hypercall6(unsigned long nr, unsigned long p1,
176			       unsigned long p2, unsigned long p3,
177			       unsigned long p4, unsigned long p5,
178			       unsigned long p6)
179{
180	diag_stat_inc(DIAG_STAT_X500);
181	return __kvm_hypercall6(nr, p1, p2, p3, p4, p5, p6);
182}
183
184/* kvm on s390 is always paravirtualization enabled */
185static inline int kvm_para_available(void)
186{
187	return 1;
188}
189
190/* No feature bits are currently assigned for kvm on s390 */
191static inline unsigned int kvm_arch_para_features(void)
192{
193	return 0;
194}
195
196static inline unsigned int kvm_arch_para_hints(void)
197{
198	return 0;
199}
200
201static inline bool kvm_check_and_clear_guest_paused(void)
202{
203	return false;
204}
205
206#endif /* __S390_KVM_PARA_H */
207