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/arch/powerpc/include/asm/kvm_para.h

https://github.com/aicjofs/android_kernel_lge_v500_20d_f2fs
C Header | 211 lines | 131 code | 40 blank | 40 comment | 4 complexity | dda7aa49630006699bf0f4a65abcbe1d MD5 | raw file
  1/*
  2 * This program is free software; you can redistribute it and/or modify
  3 * it under the terms of the GNU General Public License, version 2, as
  4 * published by the Free Software Foundation.
  5 *
  6 * This program is distributed in the hope that it will be useful,
  7 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  9 * GNU General Public License for more details.
 10 *
 11 * You should have received a copy of the GNU General Public License
 12 * along with this program; if not, write to the Free Software
 13 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 14 *
 15 * Copyright IBM Corp. 2008
 16 *
 17 * Authors: Hollis Blanchard <hollisb@us.ibm.com>
 18 */
 19
 20#ifndef __POWERPC_KVM_PARA_H__
 21#define __POWERPC_KVM_PARA_H__
 22
 23#include <linux/types.h>
 24
 25/*
 26 * Additions to this struct must only occur at the end, and should be
 27 * accompanied by a KVM_MAGIC_FEAT flag to advertise that they are present
 28 * (albeit not necessarily relevant to the current target hardware platform).
 29 *
 30 * Struct fields are always 32 or 64 bit aligned, depending on them being 32
 31 * or 64 bit wide respectively.
 32 *
 33 * See Documentation/virtual/kvm/ppc-pv.txt
 34 */
 35struct kvm_vcpu_arch_shared {
 36	__u64 scratch1;
 37	__u64 scratch2;
 38	__u64 scratch3;
 39	__u64 critical;		/* Guest may not get interrupts if == r1 */
 40	__u64 sprg0;
 41	__u64 sprg1;
 42	__u64 sprg2;
 43	__u64 sprg3;
 44	__u64 srr0;
 45	__u64 srr1;
 46	__u64 dar;		/* dear on BookE */
 47	__u64 msr;
 48	__u32 dsisr;
 49	__u32 int_pending;	/* Tells the guest if we have an interrupt */
 50	__u32 sr[16];
 51	__u32 mas0;
 52	__u32 mas1;
 53	__u64 mas7_3;
 54	__u64 mas2;
 55	__u32 mas4;
 56	__u32 mas6;
 57	__u32 esr;
 58	__u32 pir;
 59
 60	/*
 61	 * SPRG4-7 are user-readable, so we can only keep these consistent
 62	 * between the shared area and the real registers when there's an
 63	 * intervening exit to KVM.  This also applies to SPRG3 on some
 64	 * chips.
 65	 *
 66	 * This suffices for access by guest userspace, since in PR-mode
 67	 * KVM, an exit must occur when changing the guest's MSR[PR].
 68	 * If the guest kernel writes to SPRG3-7 via the shared area, it
 69	 * must also use the shared area for reading while in kernel space.
 70	 */
 71	__u64 sprg4;
 72	__u64 sprg5;
 73	__u64 sprg6;
 74	__u64 sprg7;
 75};
 76
 77#define KVM_SC_MAGIC_R0		0x4b564d21 /* "KVM!" */
 78#define HC_VENDOR_KVM		(42 << 16)
 79#define HC_EV_SUCCESS		0
 80#define HC_EV_UNIMPLEMENTED	12
 81
 82#define KVM_FEATURE_MAGIC_PAGE	1
 83
 84#define KVM_MAGIC_FEAT_SR		(1 << 0)
 85
 86/* MASn, ESR, PIR, and high SPRGs */
 87#define KVM_MAGIC_FEAT_MAS0_TO_SPRG7	(1 << 1)
 88
 89#ifdef __KERNEL__
 90
 91#ifdef CONFIG_KVM_GUEST
 92
 93#include <linux/of.h>
 94
 95static inline int kvm_para_available(void)
 96{
 97	struct device_node *hyper_node;
 98
 99	hyper_node = of_find_node_by_path("/hypervisor");
100	if (!hyper_node)
101		return 0;
102
103	if (!of_device_is_compatible(hyper_node, "linux,kvm"))
104		return 0;
105
106	return 1;
107}
108
109extern unsigned long kvm_hypercall(unsigned long *in,
110				   unsigned long *out,
111				   unsigned long nr);
112
113#else
114
115static inline int kvm_para_available(void)
116{
117	return 0;
118}
119
120static unsigned long kvm_hypercall(unsigned long *in,
121				   unsigned long *out,
122				   unsigned long nr)
123{
124	return HC_EV_UNIMPLEMENTED;
125}
126
127#endif
128
129static inline long kvm_hypercall0_1(unsigned int nr, unsigned long *r2)
130{
131	unsigned long in[8];
132	unsigned long out[8];
133	unsigned long r;
134
135	r = kvm_hypercall(in, out, nr | HC_VENDOR_KVM);
136	*r2 = out[0];
137
138	return r;
139}
140
141static inline long kvm_hypercall0(unsigned int nr)
142{
143	unsigned long in[8];
144	unsigned long out[8];
145
146	return kvm_hypercall(in, out, nr | HC_VENDOR_KVM);
147}
148
149static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
150{
151	unsigned long in[8];
152	unsigned long out[8];
153
154	in[0] = p1;
155	return kvm_hypercall(in, out, nr | HC_VENDOR_KVM);
156}
157
158static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
159				  unsigned long p2)
160{
161	unsigned long in[8];
162	unsigned long out[8];
163
164	in[0] = p1;
165	in[1] = p2;
166	return kvm_hypercall(in, out, nr | HC_VENDOR_KVM);
167}
168
169static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
170				  unsigned long p2, unsigned long p3)
171{
172	unsigned long in[8];
173	unsigned long out[8];
174
175	in[0] = p1;
176	in[1] = p2;
177	in[2] = p3;
178	return kvm_hypercall(in, out, nr | HC_VENDOR_KVM);
179}
180
181static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
182				  unsigned long p2, unsigned long p3,
183				  unsigned long p4)
184{
185	unsigned long in[8];
186	unsigned long out[8];
187
188	in[0] = p1;
189	in[1] = p2;
190	in[2] = p3;
191	in[3] = p4;
192	return kvm_hypercall(in, out, nr | HC_VENDOR_KVM);
193}
194
195
196static inline unsigned int kvm_arch_para_features(void)
197{
198	unsigned long r;
199
200	if (!kvm_para_available())
201		return 0;
202
203	if(kvm_hypercall0_1(KVM_HC_FEATURES, &r))
204		return 0;
205
206	return r;
207}
208
209#endif /* __KERNEL__ */
210
211#endif /* __POWERPC_KVM_PARA_H__ */