summaryrefslogtreecommitdiff
path: root/include/kvm/arm_vgic.h
blob: 8d22adcfe522cf061d26291386752442afb2d5a2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
/*
 * Copyright (C) 2015, 2016 ARM Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef __KVM_ARM_VGIC_H
#define __KVM_ARM_VGIC_H

#include <linux/kernel.h>
#include <linux/kvm.h>
#include <linux/irqreturn.h>
#include <linux/spinlock.h>
#include <linux/static_key.h>
#include <linux/types.h>
#include <kvm/iodev.h>
#include <linux/list.h>
#include <linux/jump_label.h>

#define VGIC_V3_MAX_CPUS	255
#define VGIC_V2_MAX_CPUS	8
#define VGIC_NR_IRQS_LEGACY     256
#define VGIC_NR_SGIS		16
#define VGIC_NR_PPIS		16
#define VGIC_NR_PRIVATE_IRQS	(VGIC_NR_SGIS + VGIC_NR_PPIS)
#define VGIC_MAX_PRIVATE	(VGIC_NR_PRIVATE_IRQS - 1)
#define VGIC_MAX_SPI		1019
#define VGIC_MAX_RESERVED	1023
#define VGIC_MIN_LPI		8192
#define KVM_IRQCHIP_NUM_PINS	(1020 - 32)

enum vgic_type {
	VGIC_V2,		/* Good ol' GICv2 */
	VGIC_V3,		/* New fancy GICv3 */
};

/* same for all guests, as depending only on the _host's_ GIC model */
struct vgic_global {
	/* type of the host GIC */
	enum vgic_type		type;

	/* Physical address of vgic virtual cpu interface */
	phys_addr_t		vcpu_base;

	/* GICV mapping */
	void __iomem		*vcpu_base_va;

	/* virtual control interface mapping */
	void __iomem		*vctrl_base;

	/* Number of implemented list registers */
	int			nr_lr;

	/* Maintenance IRQ number */
	unsigned int		maint_irq;

	/* maximum number of VCPUs allowed (GICv2 limits us to 8) */
	int			max_gic_vcpus;

	/* Only needed for the legacy KVM_CREATE_IRQCHIP */
	bool			can_emulate_gicv2;

	/* GIC system register CPU interface */
	struct static_key_false gicv3_cpuif;
};

extern struct vgic_global kvm_vgic_global_state;

#define VGIC_V2_MAX_LRS		(1 << 6)
#define VGIC_V3_MAX_LRS		16
#define VGIC_V3_LR_INDEX(lr)	(VGIC_V3_MAX_LRS - 1 - lr)

enum vgic_irq_config {
	VGIC_CONFIG_EDGE = 0,
	VGIC_CONFIG_LEVEL
};

struct vgic_irq {
	spinlock_t irq_lock;		/* Protects the content of the struct */
	struct list_head lpi_list;	/* Used to link all LPIs together */
	struct list_head ap_list;

	struct kvm_vcpu *vcpu;		/* SGIs and PPIs: The VCPU
					 * SPIs and LPIs: The VCPU whose ap_list
					 * this is queued on.
					 */

	struct kvm_vcpu *target_vcpu;	/* The VCPU that this interrupt should
					 * be sent to, as a result of the
					 * targets reg (v2) or the
					 * affinity reg (v3).
					 */

	u32 intid;			/* Guest visible INTID */
	bool pending;
	bool line_level;		/* Level only */
	bool soft_pending;		/* Level only */
	bool active;			/* not used for LPIs */
	bool enabled;
	bool hw;			/* Tied to HW IRQ */
	struct kref refcount;		/* Used for LPIs */
	u32 hwintid;			/* HW INTID number */
	union {
		u8 targets;			/* GICv2 target VCPUs mask */
		u32 mpidr;			/* GICv3 target VCPU */
	};
	u8 source;			/* GICv2 SGIs only */
	u8 priority;
	enum vgic_irq_config config;	/* Level or edge */
};

struct vgic_register_region;
struct vgic_its;

enum iodev_type {
	IODEV_CPUIF,
	IODEV_DIST,
	IODEV_REDIST,
	IODEV_ITS
};

struct vgic_io_device {
	gpa_t base_addr;
	union {
		struct kvm_vcpu *redist_vcpu;
		struct vgic_its *its;
	};
	const struct vgic_register_region *regions;
	enum iodev_type iodev_type;
	int nr_regions;
	struct kvm_io_device dev;
};

struct vgic_its {
	/* The base address of the ITS control register frame */
	gpa_t			vgic_its_base;

	bool			enabled;
	bool			initialized;
	struct vgic_io_device	iodev;
	struct kvm_device	*dev;

	/* These registers correspond to GITS_BASER{0,1} */
	u64			baser_device_table;
	u64			baser_coll_table;

	/* Protects the command queue */
	struct mutex		cmd_lock;
	u64			cbaser;
	u32			creadr;
	u32			cwriter;

	/* Protects the device and collection lists */
	struct mutex		its_lock;
	struct list_head	device_list;
	struct list_head	collection_list;
};

struct vgic_dist {
	bool			in_kernel;
	bool			ready;
	bool			initialized;

	/* vGIC model the kernel emulates for the guest (GICv2 or GICv3) */
	u32			vgic_model;

	/* Do injected MSIs require an additional device ID? */
	bool			msis_require_devid;

	int			nr_spis;

	/* TODO: Consider moving to global state */
	/* Virtual control interface mapping */
	void __iomem		*vctrl_base;

	/* base addresses in guest physical address space: */
	gpa_t			vgic_dist_base;		/* distributor */
	union {
		/* either a GICv2 CPU interface */
		gpa_t			vgic_cpu_base;
		/* or a number of GICv3 redistributor regions */
		gpa_t			vgic_redist_base;
	};

	/* distributor enabled */
	bool			enabled;

	struct vgic_irq		*spis;

	struct vgic_io_device	dist_iodev;

	bool			has_its;

	/*
	 * Contains the attributes and gpa of the LPI configuration table.
	 * Since we report GICR_TYPER.CommonLPIAff as 0b00, we can share
	 * one address across all redistributors.
	 * GICv3 spec: 6.1.2 "LPI Configuration tables"
	 */
	u64			propbaser;

	/* Protects the lpi_list and the count value below. */
	spinlock_t		lpi_list_lock;
	struct list_head	lpi_list_head;
	int			lpi_list_count;
};

struct vgic_v2_cpu_if {
	u32		vgic_hcr;
	u32		vgic_vmcr;
	u32		vgic_misr;	/* Saved only */
	u64		vgic_eisr;	/* Saved only */
	u64		vgic_elrsr;	/* Saved only */
	u32		vgic_apr;
	u32		vgic_lr[VGIC_V2_MAX_LRS];
};

struct vgic_v3_cpu_if {
#ifdef CONFIG_KVM_ARM_VGIC_V3
	u32		vgic_hcr;
	u32		vgic_vmcr;
	u32		vgic_sre;	/* Restored only, change ignored */
	u32		vgic_misr;	/* Saved only */
	u32		vgic_eisr;	/* Saved only */
	u32		vgic_elrsr;	/* Saved only */
	u32		vgic_ap0r[4];
	u32		vgic_ap1r[4];
	u64		vgic_lr[VGIC_V3_MAX_LRS];
#endif
};

struct vgic_cpu {
	/* CPU vif control registers for world switch */
	union {
		struct vgic_v2_cpu_if	vgic_v2;
		struct vgic_v3_cpu_if	vgic_v3;
	};

	unsigned int used_lrs;
	struct vgic_irq private_irqs[VGIC_NR_PRIVATE_IRQS];

	spinlock_t ap_list_lock;	/* Protects the ap_list */

	/*
	 * List of IRQs that this VCPU should consider because they are either
	 * Active or Pending (hence the name; AP list), or because they recently
	 * were one of the two and need to be migrated off this list to another
	 * VCPU.
	 */
	struct list_head ap_list_head;

	u64 live_lrs;

	/*
	 * Members below are used with GICv3 emulation only and represent
	 * parts of the redistributor.
	 */
	struct vgic_io_device	rd_iodev;
	struct vgic_io_device	sgi_iodev;

	/* Contains the attributes and gpa of the LPI pending tables. */
	u64 pendbaser;

	bool lpis_enabled;
};

extern struct static_key_false vgic_v2_cpuif_trap;

int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write);
void kvm_vgic_early_init(struct kvm *kvm);
int kvm_vgic_create(struct kvm *kvm, u32 type);
void kvm_vgic_destroy(struct kvm *kvm);
void kvm_vgic_vcpu_early_init(struct kvm_vcpu *vcpu);
void kvm_vgic_vcpu_destroy(struct kvm_vcpu *vcpu);
int kvm_vgic_map_resources(struct kvm *kvm);
int kvm_vgic_hyp_init(void);

int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int intid,
			bool level);
int kvm_vgic_inject_mapped_irq(struct kvm *kvm, int cpuid, unsigned int intid,
			       bool level);
int kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu, u32 virt_irq, u32 phys_irq);
int kvm_vgic_unmap_phys_irq(struct kvm_vcpu *vcpu, unsigned int virt_irq);
bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, unsigned int virt_irq);

int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu);

#define irqchip_in_kernel(k)	(!!((k)->arch.vgic.in_kernel))
#define vgic_initialized(k)	((k)->arch.vgic.initialized)
#define vgic_ready(k)		((k)->arch.vgic.ready)
#define vgic_valid_spi(k, i)	(((i) >= VGIC_NR_PRIVATE_IRQS) && \
			((i) < (k)->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS))

bool kvm_vcpu_has_pending_irqs(struct kvm_vcpu *vcpu);
void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu);
void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu);

#ifdef CONFIG_KVM_ARM_VGIC_V3
void vgic_v3_dispatch_sgi(struct kvm_vcpu *vcpu, u64 reg);
#else
static inline void vgic_v3_dispatch_sgi(struct kvm_vcpu *vcpu, u64 reg)
{
}
#endif

/**
 * kvm_vgic_get_max_vcpus - Get the maximum number of VCPUs allowed by HW
 *
 * The host's GIC naturally limits the maximum amount of VCPUs a guest
 * can use.
 */
static inline int kvm_vgic_get_max_vcpus(void)
{
	return kvm_vgic_global_state.max_gic_vcpus;
}

int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi);

/**
 * kvm_vgic_setup_default_irq_routing:
 * Setup a default flat gsi routing table mapping all SPIs
 */
int kvm_vgic_setup_default_irq_routing(struct kvm *kvm);

#endif /* __KVM_ARM_VGIC_H */