1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
4 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
5 */
6
7 #ifndef __ARM_KVM_HOST_H__
8 #define __ARM_KVM_HOST_H__
9
10 #include <linux/errno.h>
11 #include <linux/types.h>
12 #include <linux/kvm_types.h>
13 #include <asm/cputype.h>
14 #include <asm/kvm.h>
15 #include <asm/kvm_asm.h>
16 #include <asm/kvm_mmio.h>
17 #include <asm/fpstate.h>
18 #include <kvm/arm_arch_timer.h>
19
20 #define __KVM_HAVE_ARCH_INTC_INITIALIZED
21
22 #define KVM_USER_MEM_SLOTS 32
23 #define KVM_HAVE_ONE_REG
24 #define KVM_HALT_POLL_NS_DEFAULT 500000
25
26 #define KVM_VCPU_MAX_FEATURES 2
27
28 #include <kvm/arm_vgic.h>
29
30
31 #ifdef CONFIG_ARM_GIC_V3
32 #define KVM_MAX_VCPUS VGIC_V3_MAX_CPUS
33 #else
34 #define KVM_MAX_VCPUS VGIC_V2_MAX_CPUS
35 #endif
36
37 #define KVM_REQ_SLEEP \
38 KVM_ARCH_REQ_FLAGS(0, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
39 #define KVM_REQ_IRQ_PENDING KVM_ARCH_REQ(1)
40 #define KVM_REQ_VCPU_RESET KVM_ARCH_REQ(2)
41
42 DECLARE_STATIC_KEY_FALSE(userspace_irqchip_in_use);
43
kvm_arm_init_sve(void)44 static inline int kvm_arm_init_sve(void) { return 0; }
45
46 u32 *kvm_vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num, u32 mode);
47 int __attribute_const__ kvm_target_cpu(void);
48 int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
49 void kvm_reset_coprocs(struct kvm_vcpu *vcpu);
50
51 struct kvm_vmid {
52 /* The VMID generation used for the virt. memory system */
53 u64 vmid_gen;
54 u32 vmid;
55 };
56
57 struct kvm_arch {
58 /* The last vcpu id that ran on each physical CPU */
59 int __percpu *last_vcpu_ran;
60
61 /*
62 * Anything that is not used directly from assembly code goes
63 * here.
64 */
65
66 /* The VMID generation used for the virt. memory system */
67 struct kvm_vmid vmid;
68
69 /* Stage-2 page table */
70 pgd_t *pgd;
71 phys_addr_t pgd_phys;
72
73 /* Interrupt controller */
74 struct vgic_dist vgic;
75 int max_vcpus;
76
77 /* Mandated version of PSCI */
78 u32 psci_version;
79 };
80
81 #define KVM_NR_MEM_OBJS 40
82
83 /*
84 * We don't want allocation failures within the mmu code, so we preallocate
85 * enough memory for a single page fault in a cache.
86 */
87 struct kvm_mmu_memory_cache {
88 int nobjs;
89 void *objects[KVM_NR_MEM_OBJS];
90 };
91
92 struct kvm_vcpu_fault_info {
93 u32 hsr; /* Hyp Syndrome Register */
94 u32 hxfar; /* Hyp Data/Inst. Fault Address Register */
95 u32 hpfar; /* Hyp IPA Fault Address Register */
96 };
97
98 /*
99 * 0 is reserved as an invalid value.
100 * Order should be kept in sync with the save/restore code.
101 */
102 enum vcpu_sysreg {
103 __INVALID_SYSREG__,
104 c0_MPIDR, /* MultiProcessor ID Register */
105 c0_CSSELR, /* Cache Size Selection Register */
106 c1_SCTLR, /* System Control Register */
107 c1_ACTLR, /* Auxiliary Control Register */
108 c1_CPACR, /* Coprocessor Access Control */
109 c2_TTBR0, /* Translation Table Base Register 0 */
110 c2_TTBR0_high, /* TTBR0 top 32 bits */
111 c2_TTBR1, /* Translation Table Base Register 1 */
112 c2_TTBR1_high, /* TTBR1 top 32 bits */
113 c2_TTBCR, /* Translation Table Base Control R. */
114 c3_DACR, /* Domain Access Control Register */
115 c5_DFSR, /* Data Fault Status Register */
116 c5_IFSR, /* Instruction Fault Status Register */
117 c5_ADFSR, /* Auxilary Data Fault Status R */
118 c5_AIFSR, /* Auxilary Instrunction Fault Status R */
119 c6_DFAR, /* Data Fault Address Register */
120 c6_IFAR, /* Instruction Fault Address Register */
121 c7_PAR, /* Physical Address Register */
122 c7_PAR_high, /* PAR top 32 bits */
123 c9_L2CTLR, /* Cortex A15/A7 L2 Control Register */
124 c10_PRRR, /* Primary Region Remap Register */
125 c10_NMRR, /* Normal Memory Remap Register */
126 c12_VBAR, /* Vector Base Address Register */
127 c13_CID, /* Context ID Register */
128 c13_TID_URW, /* Thread ID, User R/W */
129 c13_TID_URO, /* Thread ID, User R/O */
130 c13_TID_PRIV, /* Thread ID, Privileged */
131 c14_CNTKCTL, /* Timer Control Register (PL1) */
132 c10_AMAIR0, /* Auxilary Memory Attribute Indirection Reg0 */
133 c10_AMAIR1, /* Auxilary Memory Attribute Indirection Reg1 */
134 NR_CP15_REGS /* Number of regs (incl. invalid) */
135 };
136
137 struct kvm_cpu_context {
138 struct kvm_regs gp_regs;
139 struct vfp_hard_struct vfp;
140 u32 cp15[NR_CP15_REGS];
141 };
142
143 struct kvm_host_data {
144 struct kvm_cpu_context host_ctxt;
145 };
146
147 typedef struct kvm_host_data kvm_host_data_t;
148
kvm_init_host_cpu_context(struct kvm_cpu_context * cpu_ctxt)149 static inline void kvm_init_host_cpu_context(struct kvm_cpu_context *cpu_ctxt)
150 {
151 /* The host's MPIDR is immutable, so let's set it up at boot time */
152 cpu_ctxt->cp15[c0_MPIDR] = read_cpuid_mpidr();
153 }
154
155 struct vcpu_reset_state {
156 unsigned long pc;
157 unsigned long r0;
158 bool be;
159 bool reset;
160 };
161
162 struct kvm_vcpu_arch {
163 struct kvm_cpu_context ctxt;
164
165 int target; /* Processor target */
166 DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES);
167
168 /* The CPU type we expose to the VM */
169 u32 midr;
170
171 /* HYP trapping configuration */
172 u32 hcr;
173
174 /* Exception Information */
175 struct kvm_vcpu_fault_info fault;
176
177 /* Host FP context */
178 struct kvm_cpu_context *host_cpu_context;
179
180 /* VGIC state */
181 struct vgic_cpu vgic_cpu;
182 struct arch_timer_cpu timer_cpu;
183
184 /*
185 * Anything that is not used directly from assembly code goes
186 * here.
187 */
188
189 /* vcpu power-off state */
190 bool power_off;
191
192 /* Don't run the guest (internal implementation need) */
193 bool pause;
194
195 /* IO related fields */
196 struct kvm_decode mmio_decode;
197
198 /* Cache some mmu pages needed inside spinlock regions */
199 struct kvm_mmu_memory_cache mmu_page_cache;
200
201 struct vcpu_reset_state reset_state;
202
203 /* Detect first run of a vcpu */
204 bool has_run_once;
205 };
206
207 struct kvm_vm_stat {
208 ulong remote_tlb_flush;
209 };
210
211 struct kvm_vcpu_stat {
212 u64 halt_successful_poll;
213 u64 halt_attempted_poll;
214 u64 halt_poll_invalid;
215 u64 halt_wakeup;
216 u64 hvc_exit_stat;
217 u64 wfe_exit_stat;
218 u64 wfi_exit_stat;
219 u64 mmio_exit_user;
220 u64 mmio_exit_kernel;
221 u64 exits;
222 };
223
224 #define vcpu_cp15(v,r) (v)->arch.ctxt.cp15[r]
225
226 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init);
227 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
228 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
229 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
230 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
231
232 unsigned long __kvm_call_hyp(void *hypfn, ...);
233
234 /*
235 * The has_vhe() part doesn't get emitted, but is used for type-checking.
236 */
237 #define kvm_call_hyp(f, ...) \
238 do { \
239 if (has_vhe()) { \
240 f(__VA_ARGS__); \
241 } else { \
242 __kvm_call_hyp(kvm_ksym_ref(f), ##__VA_ARGS__); \
243 } \
244 } while(0)
245
246 #define kvm_call_hyp_ret(f, ...) \
247 ({ \
248 typeof(f(__VA_ARGS__)) ret; \
249 \
250 if (has_vhe()) { \
251 ret = f(__VA_ARGS__); \
252 } else { \
253 ret = __kvm_call_hyp(kvm_ksym_ref(f), \
254 ##__VA_ARGS__); \
255 } \
256 \
257 ret; \
258 })
259
260 void force_vm_exit(const cpumask_t *mask);
261 int __kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
262 struct kvm_vcpu_events *events);
263
264 int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
265 struct kvm_vcpu_events *events);
266
267 #define KVM_ARCH_WANT_MMU_NOTIFIER
268 int kvm_unmap_hva_range(struct kvm *kvm,
269 unsigned long start, unsigned long end);
270 int kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
271
272 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
273 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
274 int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
275 int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
276
277 struct kvm_vcpu *kvm_arm_get_running_vcpu(void);
278 struct kvm_vcpu __percpu **kvm_get_running_vcpus(void);
279 void kvm_arm_halt_guest(struct kvm *kvm);
280 void kvm_arm_resume_guest(struct kvm *kvm);
281
282 int kvm_arm_copy_coproc_indices(struct kvm_vcpu *vcpu, u64 __user *uindices);
283 unsigned long kvm_arm_num_coproc_regs(struct kvm_vcpu *vcpu);
284 int kvm_arm_coproc_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
285 int kvm_arm_coproc_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
286
287 int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
288 int exception_index);
289
handle_exit_early(struct kvm_vcpu * vcpu,struct kvm_run * run,int exception_index)290 static inline void handle_exit_early(struct kvm_vcpu *vcpu, struct kvm_run *run,
291 int exception_index) {}
292
__cpu_init_hyp_mode(phys_addr_t pgd_ptr,unsigned long hyp_stack_ptr,unsigned long vector_ptr)293 static inline void __cpu_init_hyp_mode(phys_addr_t pgd_ptr,
294 unsigned long hyp_stack_ptr,
295 unsigned long vector_ptr)
296 {
297 /*
298 * Call initialization code, and switch to the full blown HYP
299 * code. The init code doesn't need to preserve these
300 * registers as r0-r3 are already callee saved according to
301 * the AAPCS.
302 * Note that we slightly misuse the prototype by casting the
303 * stack pointer to a void *.
304
305 * The PGDs are always passed as the third argument, in order
306 * to be passed into r2-r3 to the init code (yes, this is
307 * compliant with the PCS!).
308 */
309
310 __kvm_call_hyp((void*)hyp_stack_ptr, vector_ptr, pgd_ptr);
311 }
312
__cpu_init_stage2(void)313 static inline void __cpu_init_stage2(void)
314 {
315 kvm_call_hyp(__init_stage2_translation);
316 }
317
kvm_arch_vm_ioctl_check_extension(struct kvm * kvm,long ext)318 static inline int kvm_arch_vm_ioctl_check_extension(struct kvm *kvm, long ext)
319 {
320 return 0;
321 }
322
323 int kvm_perf_init(void);
324 int kvm_perf_teardown(void);
325
326 void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot);
327
328 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr);
329
kvm_arch_requires_vhe(void)330 static inline bool kvm_arch_requires_vhe(void) { return false; }
kvm_arch_hardware_unsetup(void)331 static inline void kvm_arch_hardware_unsetup(void) {}
kvm_arch_sync_events(struct kvm * kvm)332 static inline void kvm_arch_sync_events(struct kvm *kvm) {}
kvm_arch_vcpu_uninit(struct kvm_vcpu * vcpu)333 static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
kvm_arch_sched_in(struct kvm_vcpu * vcpu,int cpu)334 static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
kvm_arch_vcpu_block_finish(struct kvm_vcpu * vcpu)335 static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}
336
kvm_arm_init_debug(void)337 static inline void kvm_arm_init_debug(void) {}
kvm_arm_setup_debug(struct kvm_vcpu * vcpu)338 static inline void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) {}
kvm_arm_clear_debug(struct kvm_vcpu * vcpu)339 static inline void kvm_arm_clear_debug(struct kvm_vcpu *vcpu) {}
kvm_arm_reset_debug_ptr(struct kvm_vcpu * vcpu)340 static inline void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu) {}
341
342 int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu,
343 struct kvm_device_attr *attr);
344 int kvm_arm_vcpu_arch_get_attr(struct kvm_vcpu *vcpu,
345 struct kvm_device_attr *attr);
346 int kvm_arm_vcpu_arch_has_attr(struct kvm_vcpu *vcpu,
347 struct kvm_device_attr *attr);
348
349 /*
350 * VFP/NEON switching is all done by the hyp switch code, so no need to
351 * coordinate with host context handling for this state:
352 */
kvm_arch_vcpu_load_fp(struct kvm_vcpu * vcpu)353 static inline void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu) {}
kvm_arch_vcpu_ctxsync_fp(struct kvm_vcpu * vcpu)354 static inline void kvm_arch_vcpu_ctxsync_fp(struct kvm_vcpu *vcpu) {}
kvm_arch_vcpu_put_fp(struct kvm_vcpu * vcpu)355 static inline void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu) {}
356
kvm_vcpu_pmu_restore_guest(struct kvm_vcpu * vcpu)357 static inline void kvm_vcpu_pmu_restore_guest(struct kvm_vcpu *vcpu) {}
kvm_vcpu_pmu_restore_host(struct kvm_vcpu * vcpu)358 static inline void kvm_vcpu_pmu_restore_host(struct kvm_vcpu *vcpu) {}
359
kvm_arm_vhe_guest_enter(void)360 static inline void kvm_arm_vhe_guest_enter(void) {}
kvm_arm_vhe_guest_exit(void)361 static inline void kvm_arm_vhe_guest_exit(void) {}
362
363 #define KVM_BP_HARDEN_UNKNOWN -1
364 #define KVM_BP_HARDEN_WA_NEEDED 0
365 #define KVM_BP_HARDEN_NOT_REQUIRED 1
366
kvm_arm_harden_branch_predictor(void)367 static inline int kvm_arm_harden_branch_predictor(void)
368 {
369 switch(read_cpuid_part()) {
370 #ifdef CONFIG_HARDEN_BRANCH_PREDICTOR
371 case ARM_CPU_PART_BRAHMA_B15:
372 case ARM_CPU_PART_CORTEX_A12:
373 case ARM_CPU_PART_CORTEX_A15:
374 case ARM_CPU_PART_CORTEX_A17:
375 return KVM_BP_HARDEN_WA_NEEDED;
376 #endif
377 case ARM_CPU_PART_CORTEX_A7:
378 return KVM_BP_HARDEN_NOT_REQUIRED;
379 default:
380 return KVM_BP_HARDEN_UNKNOWN;
381 }
382 }
383
384 #define KVM_SSBD_UNKNOWN -1
385 #define KVM_SSBD_FORCE_DISABLE 0
386 #define KVM_SSBD_KERNEL 1
387 #define KVM_SSBD_FORCE_ENABLE 2
388 #define KVM_SSBD_MITIGATED 3
389
kvm_arm_have_ssbd(void)390 static inline int kvm_arm_have_ssbd(void)
391 {
392 /* No way to detect it yet, pretend it is not there. */
393 return KVM_SSBD_UNKNOWN;
394 }
395
kvm_vcpu_load_sysregs(struct kvm_vcpu * vcpu)396 static inline void kvm_vcpu_load_sysregs(struct kvm_vcpu *vcpu) {}
kvm_vcpu_put_sysregs(struct kvm_vcpu * vcpu)397 static inline void kvm_vcpu_put_sysregs(struct kvm_vcpu *vcpu) {}
398
399 #define __KVM_HAVE_ARCH_VM_ALLOC
400 struct kvm *kvm_arch_alloc_vm(void);
401 void kvm_arch_free_vm(struct kvm *kvm);
402
kvm_arm_setup_stage2(struct kvm * kvm,unsigned long type)403 static inline int kvm_arm_setup_stage2(struct kvm *kvm, unsigned long type)
404 {
405 /*
406 * On 32bit ARM, VMs get a static 40bit IPA stage2 setup,
407 * so any non-zero value used as type is illegal.
408 */
409 if (type)
410 return -EINVAL;
411 return 0;
412 }
413
kvm_arm_vcpu_finalize(struct kvm_vcpu * vcpu,int feature)414 static inline int kvm_arm_vcpu_finalize(struct kvm_vcpu *vcpu, int feature)
415 {
416 return -EINVAL;
417 }
418
kvm_arm_vcpu_is_finalized(struct kvm_vcpu * vcpu)419 static inline bool kvm_arm_vcpu_is_finalized(struct kvm_vcpu *vcpu)
420 {
421 return true;
422 }
423
424 #endif /* __ARM_KVM_HOST_H__ */
425
