[deliverable/linux.git] / arch / s390 / include / asm / kvm_para.h

/*
 * definition for paravirtual devices on s390
 *
 * Copyright IBM Corp. 2008
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License (version 2 only)
 * as published by the Free Software Foundation.
 *
 *    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>
 *
 * This work is licensed under the terms of the GNU GPL, version 2.
 */
#ifndef __S390_KVM_PARA_H
#define __S390_KVM_PARA_H

#include <uapi/asm/kvm_para.h>


static inline long kvm_hypercall0(unsigned long nr)
{
	register unsigned long __nr asm("1") = nr;
	register long __rc asm("2");

	asm volatile ("diag 2,4,0x500\n"
		      : "=d" (__rc) : "d" (__nr): "memory", "cc");
	return __rc;
}

static inline long kvm_hypercall1(unsigned long nr, unsigned long p1)
{
	register unsigned long __nr asm("1") = nr;
	register unsigned long __p1 asm("2") = p1;
	register long __rc asm("2");

	asm volatile ("diag 2,4,0x500\n"
		      : "=d" (__rc) : "d" (__nr), "0" (__p1) : "memory", "cc");
	return __rc;
}

static inline long kvm_hypercall2(unsigned long nr, unsigned long p1,
			       unsigned long p2)
{
	register unsigned long __nr asm("1") = nr;
	register unsigned long __p1 asm("2") = p1;
	register unsigned long __p2 asm("3") = p2;
	register long __rc asm("2");

	asm volatile ("diag 2,4,0x500\n"
		      : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2)
		      : "memory", "cc");
	return __rc;
}

static inline long kvm_hypercall3(unsigned long nr, unsigned long p1,
			       unsigned long p2, unsigned long p3)
{
	register unsigned long __nr asm("1") = nr;
	register unsigned long __p1 asm("2") = p1;
	register unsigned long __p2 asm("3") = p2;
	register unsigned long __p3 asm("4") = p3;
	register long __rc asm("2");

	asm volatile ("diag 2,4,0x500\n"
		      : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
			"d" (__p3) : "memory", "cc");
	return __rc;
}


static inline long kvm_hypercall4(unsigned long nr, unsigned long p1,
			       unsigned long p2, unsigned long p3,
			       unsigned long p4)
{
	register unsigned long __nr asm("1") = nr;
	register unsigned long __p1 asm("2") = p1;
	register unsigned long __p2 asm("3") = p2;
	register unsigned long __p3 asm("4") = p3;
	register unsigned long __p4 asm("5") = p4;
	register long __rc asm("2");

	asm volatile ("diag 2,4,0x500\n"
		      : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
			"d" (__p3), "d" (__p4) : "memory", "cc");
	return __rc;
}

static inline long kvm_hypercall5(unsigned long nr, unsigned long p1,
			       unsigned long p2, unsigned long p3,
			       unsigned long p4, unsigned long p5)
{
	register unsigned long __nr asm("1") = nr;
	register unsigned long __p1 asm("2") = p1;
	register unsigned long __p2 asm("3") = p2;
	register unsigned long __p3 asm("4") = p3;
	register unsigned long __p4 asm("5") = p4;
	register unsigned long __p5 asm("6") = p5;
	register long __rc asm("2");

	asm volatile ("diag 2,4,0x500\n"
		      : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
			"d" (__p3), "d" (__p4), "d" (__p5)  : "memory", "cc");
	return __rc;
}

static inline long kvm_hypercall6(unsigned long nr, unsigned long p1,
			       unsigned long p2, unsigned long p3,
			       unsigned long p4, unsigned long p5,
			       unsigned long p6)
{
	register unsigned long __nr asm("1") = nr;
	register unsigned long __p1 asm("2") = p1;
	register unsigned long __p2 asm("3") = p2;
	register unsigned long __p3 asm("4") = p3;
	register unsigned long __p4 asm("5") = p4;
	register unsigned long __p5 asm("6") = p5;
	register unsigned long __p6 asm("7") = p6;
	register long __rc asm("2");

	asm volatile ("diag 2,4,0x500\n"
		      : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
			"d" (__p3), "d" (__p4), "d" (__p5), "d" (__p6)
		      : "memory", "cc");
	return __rc;
}

/* 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 bool kvm_check_and_clear_guest_paused(void)
{
	return false;
}

#endif /* __S390_KVM_PARA_H */
Commit	Line	Data
b0c632db	1	/*
a53c8fab	2	* definition for paravirtual devices on s390
b0c632db HC	3	*
	4	* Copyright IBM Corp. 2008
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License (version 2 only)
	8	* as published by the Free Software Foundation.
	9	*
	10	* Author(s): Christian Borntraeger <borntraeger@de.ibm.com>
	11	*/
b0c632db	12	/*
e976a2b9 CB	13	* Hypercalls for KVM on s390. The calling convention is similar to the
	14	* s390 ABI, so we use R2-R6 for parameters 1-5. In addition we use R1
	15	* as hypercall number and R7 as parameter 6. The return value is
	16	* written to R2. We use the diagnose instruction as hypercall. To avoid
	17	* conflicts with existing diagnoses for LPAR and z/VM, we do not use
	18	* the instruction encoded number, but specify the number in R1 and
	19	* use 0x500 as KVM hypercall
	20	*
	21	* Copyright IBM Corp. 2007,2008
	22	* Author(s): Christian Borntraeger <borntraeger@de.ibm.com>
	23	*
	24	* This work is licensed under the terms of the GNU GPL, version 2.
b0c632db	25	*/
9807f759 DH	26	#ifndef __S390_KVM_PARA_H
	27	#define __S390_KVM_PARA_H
	28
	29	#include <uapi/asm/kvm_para.h>
	30
	31
b0c632db	32
e976a2b9 CB	33	static inline long kvm_hypercall0(unsigned long nr)
	34	{
	35	register unsigned long __nr asm("1") = nr;
	36	register long __rc asm("2");
	37
	38	asm volatile ("diag 2,4,0x500\n"
	39	: "=d" (__rc) : "d" (__nr): "memory", "cc");
	40	return __rc;
	41	}
	42
	43	static 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
	54	static inline long kvm_hypercall2(unsigned long nr, unsigned long p1,
	55	unsigned long p2)
	56	{
	57	register unsigned long __nr asm("1") = nr;
	58	register unsigned long __p1 asm("2") = p1;
	59	register unsigned long __p2 asm("3") = p2;
	60	register long __rc asm("2");
	61
	62	asm volatile ("diag 2,4,0x500\n"
	63	: "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2)
	64	: "memory", "cc");
	65	return __rc;
	66	}
	67
	68	static inline long kvm_hypercall3(unsigned long nr, unsigned long p1,
	69	unsigned long p2, unsigned long p3)
	70	{
	71	register unsigned long __nr asm("1") = nr;
	72	register unsigned long __p1 asm("2") = p1;
	73	register unsigned long __p2 asm("3") = p2;
	74	register unsigned long __p3 asm("4") = p3;
	75	register long __rc asm("2");
	76
	77	asm volatile ("diag 2,4,0x500\n"
	78	: "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
	79	"d" (__p3) : "memory", "cc");
	80	return __rc;
	81	}
	82
	83
	84	static inline long kvm_hypercall4(unsigned long nr, unsigned long p1,
	85	unsigned long p2, unsigned long p3,
	86	unsigned long p4)
	87	{
	88	register unsigned long __nr asm("1") = nr;
	89	register unsigned long __p1 asm("2") = p1;
	90	register unsigned long __p2 asm("3") = p2;
	91	register unsigned long __p3 asm("4") = p3;
	92	register unsigned long __p4 asm("5") = p4;
	93	register long __rc asm("2");
	94
	95	asm volatile ("diag 2,4,0x500\n"
	96	: "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
97	"d" (__p3), "d" (__p4) : "memory", "cc");
98	return __rc;
99	}
100
101	static inline long kvm_hypercall5(unsigned long nr, unsigned long p1,
102	unsigned long p2, unsigned long p3,
103	unsigned long p4, unsigned long p5)
104	{
105	register unsigned long __nr asm("1") = nr;
106	register unsigned long __p1 asm("2") = p1;
107	register unsigned long __p2 asm("3") = p2;
108	register unsigned long __p3 asm("4") = p3;
109	register unsigned long __p4 asm("5") = p4;
110	register unsigned long __p5 asm("6") = p5;
111	register long __rc asm("2");
112
113	asm volatile ("diag 2,4,0x500\n"
114	: "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
115	"d" (__p3), "d" (__p4), "d" (__p5) : "memory", "cc");
116	return __rc;
117	}
118
119	static inline long kvm_hypercall6(unsigned long nr, unsigned long p1,
120	unsigned long p2, unsigned long p3,
121	unsigned long p4, unsigned long p5,
122	unsigned long p6)
123	{
124	register unsigned long __nr asm("1") = nr;
125	register unsigned long __p1 asm("2") = p1;
126	register unsigned long __p2 asm("3") = p2;
127	register unsigned long __p3 asm("4") = p3;
128	register unsigned long __p4 asm("5") = p4;
129	register unsigned long __p5 asm("6") = p5;
130	register unsigned long __p6 asm("7") = p6;
131	register long __rc asm("2");
132
133	asm volatile ("diag 2,4,0x500\n"
134	: "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
135	"d" (__p3), "d" (__p4), "d" (__p5), "d" (__p6)
136	: "memory", "cc");
137	return __rc;
138	}
139
140	/* kvm on s390 is always paravirtualization enabled */
b0c632db HC	141	static inline int kvm_para_available(void)
b0c632db HC	142	{
e976a2b9	143	return 1;
b0c632db HC	144	}
b0c632db HC	145
e976a2b9	146	/* No feature bits are currently assigned for kvm on s390 */
b0c632db HC	147	static inline unsigned int kvm_arch_para_features(void)
	148	{
	149	return 0;
	150	}
	151
3b5d56b9 EM	152	static inline bool kvm_check_and_clear_guest_paused(void)
	153	{
	154	return false;
	155	}
	156
b0c632db	157	#endif /* __S390_KVM_PARA_H */