summaryrefslogtreecommitdiffstats
path: root/arch/arm/include/asm/kvm_host.h
blob: 075e1921fdd909096715f6c23c2ab0eb185f0b1a (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
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
/*
 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
 *
 * 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, write to the Free Software
 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#ifndef __ARM_KVM_HOST_H__
#define __ARM_KVM_HOST_H__

#include <linux/errno.h>
#include <linux/types.h>
#include <linux/kvm_types.h>
#include <asm/cputype.h>
#include <asm/kvm.h>
#include <asm/kvm_asm.h>
#include <asm/kvm_mmio.h>
#include <asm/fpstate.h>
#include <asm/smp_plat.h>
#include <kvm/arm_arch_timer.h>

#define __KVM_HAVE_ARCH_INTC_INITIALIZED

#define KVM_USER_MEM_SLOTS 32
#define KVM_HAVE_ONE_REG
#define KVM_HALT_POLL_NS_DEFAULT 500000

#define KVM_VCPU_MAX_FEATURES 2

#include <kvm/arm_vgic.h>


#ifdef CONFIG_ARM_GIC_V3
#define KVM_MAX_VCPUS VGIC_V3_MAX_CPUS
#else
#define KVM_MAX_VCPUS VGIC_V2_MAX_CPUS
#endif

#define KVM_REQ_SLEEP \
	KVM_ARCH_REQ_FLAGS(0, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_IRQ_PENDING	KVM_ARCH_REQ(1)
#define KVM_REQ_VCPU_RESET	KVM_ARCH_REQ(2)

DECLARE_STATIC_KEY_FALSE(userspace_irqchip_in_use);

static inline int kvm_arm_init_sve(void) { return 0; }

u32 *kvm_vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num, u32 mode);
int __attribute_const__ kvm_target_cpu(void);
int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
void kvm_reset_coprocs(struct kvm_vcpu *vcpu);

struct kvm_vmid {
	/* The VMID generation used for the virt. memory system */
	u64    vmid_gen;
	u32    vmid;
};

struct kvm_arch {
	/* The last vcpu id that ran on each physical CPU */
	int __percpu *last_vcpu_ran;

	/*
	 * Anything that is not used directly from assembly code goes
	 * here.
	 */

	/* The VMID generation used for the virt. memory system */
	struct kvm_vmid vmid;

	/* Stage-2 page table */
	pgd_t *pgd;
	phys_addr_t pgd_phys;

	/* Interrupt controller */
	struct vgic_dist	vgic;
	int max_vcpus;

	/* Mandated version of PSCI */
	u32 psci_version;
};

#define KVM_NR_MEM_OBJS     40

/*
 * We don't want allocation failures within the mmu code, so we preallocate
 * enough memory for a single page fault in a cache.
 */
struct kvm_mmu_memory_cache {
	int nobjs;
	void *objects[KVM_NR_MEM_OBJS];
};

struct kvm_vcpu_fault_info {
	u32 hsr;		/* Hyp Syndrome Register */
	u32 hxfar;		/* Hyp Data/Inst. Fault Address Register */
	u32 hpfar;		/* Hyp IPA Fault Address Register */
};

/*
 * 0 is reserved as an invalid value.
 * Order should be kept in sync with the save/restore code.
 */
enum vcpu_sysreg {
	__INVALID_SYSREG__,
	c0_MPIDR,		/* MultiProcessor ID Register */
	c0_CSSELR,		/* Cache Size Selection Register */
	c1_SCTLR,		/* System Control Register */
	c1_ACTLR,		/* Auxiliary Control Register */
	c1_CPACR,		/* Coprocessor Access Control */
	c2_TTBR0,		/* Translation Table Base Register 0 */
	c2_TTBR0_high,		/* TTBR0 top 32 bits */
	c2_TTBR1,		/* Translation Table Base Register 1 */
	c2_TTBR1_high,		/* TTBR1 top 32 bits */
	c2_TTBCR,		/* Translation Table Base Control R. */
	c3_DACR,		/* Domain Access Control Register */
	c5_DFSR,		/* Data Fault Status Register */
	c5_IFSR,		/* Instruction Fault Status Register */
	c5_ADFSR,		/* Auxilary Data Fault Status R */
	c5_AIFSR,		/* Auxilary Instrunction Fault Status R */
	c6_DFAR,		/* Data Fault Address Register */
	c6_IFAR,		/* Instruction Fault Address Register */
	c7_PAR,			/* Physical Address Register */
	c7_PAR_high,		/* PAR top 32 bits */
	c9_L2CTLR,		/* Cortex A15/A7 L2 Control Register */
	c10_PRRR,		/* Primary Region Remap Register */
	c10_NMRR,		/* Normal Memory Remap Register */
	c12_VBAR,		/* Vector Base Address Register */
	c13_CID,		/* Context ID Register */
	c13_TID_URW,		/* Thread ID, User R/W */
	c13_TID_URO,		/* Thread ID, User R/O */
	c13_TID_PRIV,		/* Thread ID, Privileged */
	c14_CNTKCTL,		/* Timer Control Register (PL1) */
	c10_AMAIR0,		/* Auxilary Memory Attribute Indirection Reg0 */
	c10_AMAIR1,		/* Auxilary Memory Attribute Indirection Reg1 */
	NR_CP15_REGS		/* Number of regs (incl. invalid) */
};

struct kvm_cpu_context {
	struct kvm_regs	gp_regs;
	struct vfp_hard_struct vfp;
	u32 cp15[NR_CP15_REGS];
};

struct kvm_host_data {
	struct kvm_cpu_context host_ctxt;
};

typedef struct kvm_host_data kvm_host_data_t;

static inline void kvm_init_host_cpu_context(struct kvm_cpu_context *cpu_ctxt,
					     int cpu)
{
	/* The host's MPIDR is immutable, so let's set it up at boot time */
	cpu_ctxt->cp15[c0_MPIDR] = cpu_logical_map(cpu);
}

struct vcpu_reset_state {
	unsigned long	pc;
	unsigned long	r0;
	bool		be;
	bool		reset;
};

struct kvm_vcpu_arch {
	struct kvm_cpu_context ctxt;

	int target; /* Processor target */
	DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES);

	/* The CPU type we expose to the VM */
	u32 midr;

	/* HYP trapping configuration */
	u32 hcr;

	/* Exception Information */
	struct kvm_vcpu_fault_info fault;

	/* Host FP context */
	struct kvm_cpu_context *host_cpu_context;

	/* VGIC state */
	struct vgic_cpu vgic_cpu;
	struct arch_timer_cpu timer_cpu;

	/*
	 * Anything that is not used directly from assembly code goes
	 * here.
	 */

	/* vcpu power-off state */
	bool power_off;

	 /* Don't run the guest (internal implementation need) */
	bool pause;

	/* IO related fields */
	struct kvm_decode mmio_decode;

	/* Cache some mmu pages needed inside spinlock regions */
	struct kvm_mmu_memory_cache mmu_page_cache;

	struct vcpu_reset_state reset_state;

	/* Detect first run of a vcpu */
	bool has_run_once;
};

struct kvm_vm_stat {
	ulong remote_tlb_flush;
};

struct kvm_vcpu_stat {
	u64 halt_successful_poll;
	u64 halt_attempted_poll;
	u64 halt_poll_invalid;
	u64 halt_wakeup;
	u64 hvc_exit_stat;
	u64 wfe_exit_stat;
	u64 wfi_exit_stat;
	u64 mmio_exit_user;
	u64 mmio_exit_kernel;
	u64 exits;
};

#define vcpu_cp15(v,r)	(v)->arch.ctxt.cp15[r]

int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init);
unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);

unsigned long __kvm_call_hyp(void *hypfn, ...);

/*
 * The has_vhe() part doesn't get emitted, but is used for type-checking.
 */
#define kvm_call_hyp(f, ...)						\
	do {								\
		if (has_vhe()) {					\
			f(__VA_ARGS__);					\
		} else {						\
			__kvm_call_hyp(kvm_ksym_ref(f), ##__VA_ARGS__); \
		}							\
	} while(0)

#define kvm_call_hyp_ret(f, ...)					\
	({								\
		typeof(f(__VA_ARGS__)) ret;				\
									\
		if (has_vhe()) {					\
			ret = f(__VA_ARGS__);				\
		} else {						\
			ret = __kvm_call_hyp(kvm_ksym_ref(f),		\
					     ##__VA_ARGS__);		\
		}							\
									\
		ret;							\
	})

void force_vm_exit(const cpumask_t *mask);
int __kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
			      struct kvm_vcpu_events *events);

int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
			      struct kvm_vcpu_events *events);

#define KVM_ARCH_WANT_MMU_NOTIFIER
int kvm_unmap_hva_range(struct kvm *kvm,
			unsigned long start, unsigned long end);
int kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);

unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);

struct kvm_vcpu *kvm_arm_get_running_vcpu(void);
struct kvm_vcpu __percpu **kvm_get_running_vcpus(void);
void kvm_arm_halt_guest(struct kvm *kvm);
void kvm_arm_resume_guest(struct kvm *kvm);

int kvm_arm_copy_coproc_indices(struct kvm_vcpu *vcpu, u64 __user *uindices);
unsigned long kvm_arm_num_coproc_regs(struct kvm_vcpu *vcpu);
int kvm_arm_coproc_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
int kvm_arm_coproc_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);

int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
		int exception_index);

static inline void handle_exit_early(struct kvm_vcpu *vcpu, struct kvm_run *run,
				     int exception_index) {}

static inline void __cpu_init_hyp_mode(phys_addr_t pgd_ptr,
				       unsigned long hyp_stack_ptr,
				       unsigned long vector_ptr)
{
	/*
	 * Call initialization code, and switch to the full blown HYP
	 * code. The init code doesn't need to preserve these
	 * registers as r0-r3 are already callee saved according to
	 * the AAPCS.
	 * Note that we slightly misuse the prototype by casting the
	 * stack pointer to a void *.

	 * The PGDs are always passed as the third argument, in order
	 * to be passed into r2-r3 to the init code (yes, this is
	 * compliant with the PCS!).
	 */

	__kvm_call_hyp((void*)hyp_stack_ptr, vector_ptr, pgd_ptr);
}

static inline void __cpu_init_stage2(void)
{
	kvm_call_hyp(__init_stage2_translation);
}

static inline int kvm_arch_vm_ioctl_check_extension(struct kvm *kvm, long ext)
{
	return 0;
}

int kvm_perf_init(void);
int kvm_perf_teardown(void);

void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot);

struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr);

static inline bool kvm_arch_requires_vhe(void) { return false; }
static inline void kvm_arch_hardware_unsetup(void) {}
static inline void kvm_arch_sync_events(struct kvm *kvm) {}
static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}

static inline void kvm_arm_init_debug(void) {}
static inline void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) {}
static inline void kvm_arm_clear_debug(struct kvm_vcpu *vcpu) {}
static inline void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu) {}

int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu,
			       struct kvm_device_attr *attr);
int kvm_arm_vcpu_arch_get_attr(struct kvm_vcpu *vcpu,
			       struct kvm_device_attr *attr);
int kvm_arm_vcpu_arch_has_attr(struct kvm_vcpu *vcpu,
			       struct kvm_device_attr *attr);

/*
 * VFP/NEON switching is all done by the hyp switch code, so no need to
 * coordinate with host context handling for this state:
 */
static inline void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu) {}
static inline void kvm_arch_vcpu_ctxsync_fp(struct kvm_vcpu *vcpu) {}
static inline void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu) {}

static inline void kvm_vcpu_pmu_restore_guest(struct kvm_vcpu *vcpu) {}
static inline void kvm_vcpu_pmu_restore_host(struct kvm_vcpu *vcpu) {}

static inline void kvm_arm_vhe_guest_enter(void) {}
static inline void kvm_arm_vhe_guest_exit(void) {}

static inline bool kvm_arm_harden_branch_predictor(void)
{
	switch(read_cpuid_part()) {
#ifdef CONFIG_HARDEN_BRANCH_PREDICTOR
	case ARM_CPU_PART_BRAHMA_B15:
	case ARM_CPU_PART_CORTEX_A12:
	case ARM_CPU_PART_CORTEX_A15:
	case ARM_CPU_PART_CORTEX_A17:
		return true;
#endif
	default:
		return false;
	}
}

#define KVM_SSBD_UNKNOWN		-1
#define KVM_SSBD_FORCE_DISABLE		0
#define KVM_SSBD_KERNEL		1
#define KVM_SSBD_FORCE_ENABLE		2
#define KVM_SSBD_MITIGATED		3

static inline int kvm_arm_have_ssbd(void)
{
	/* No way to detect it yet, pretend it is not there. */
	return KVM_SSBD_UNKNOWN;
}

static inline void kvm_vcpu_load_sysregs(struct kvm_vcpu *vcpu) {}
static inline void kvm_vcpu_put_sysregs(struct kvm_vcpu *vcpu) {}

#define __KVM_HAVE_ARCH_VM_ALLOC
struct kvm *kvm_arch_alloc_vm(void);
void kvm_arch_free_vm(struct kvm *kvm);

static inline int kvm_arm_setup_stage2(struct kvm *kvm, unsigned long type)
{
	/*
	 * On 32bit ARM, VMs get a static 40bit IPA stage2 setup,
	 * so any non-zero value used as type is illegal.
	 */
	if (type)
		return -EINVAL;
	return 0;
}

static inline int kvm_arm_vcpu_finalize(struct kvm_vcpu *vcpu, int feature)
{
	return -EINVAL;
}

static inline bool kvm_arm_vcpu_is_finalized(struct kvm_vcpu *vcpu)
{
	return true;
}

#endif /* __ARM_KVM_HOST_H__ */