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Commit | Line | Data |
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669e846e SL |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * KVM/MIPS: MIPS specific KVM APIs | |
7 | * | |
8 | * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. | |
9 | * Authors: Sanjay Lal <sanjayl@kymasys.com> | |
d116e812 | 10 | */ |
669e846e | 11 | |
05108709 | 12 | #include <linux/bitops.h> |
669e846e SL |
13 | #include <linux/errno.h> |
14 | #include <linux/err.h> | |
98e91b84 | 15 | #include <linux/kdebug.h> |
669e846e | 16 | #include <linux/module.h> |
d852b5f3 | 17 | #include <linux/uaccess.h> |
669e846e | 18 | #include <linux/vmalloc.h> |
174cd4b1 | 19 | #include <linux/sched/signal.h> |
669e846e SL |
20 | #include <linux/fs.h> |
21 | #include <linux/bootmem.h> | |
174cd4b1 | 22 | |
f798217d | 23 | #include <asm/fpu.h> |
669e846e SL |
24 | #include <asm/page.h> |
25 | #include <asm/cacheflush.h> | |
26 | #include <asm/mmu_context.h> | |
06c158c9 | 27 | #include <asm/pgalloc.h> |
c4c6f2ca | 28 | #include <asm/pgtable.h> |
669e846e SL |
29 | |
30 | #include <linux/kvm_host.h> | |
31 | ||
d7d5b05f DZ |
32 | #include "interrupt.h" |
33 | #include "commpage.h" | |
669e846e SL |
34 | |
35 | #define CREATE_TRACE_POINTS | |
36 | #include "trace.h" | |
37 | ||
38 | #ifndef VECTORSPACING | |
39 | #define VECTORSPACING 0x100 /* for EI/VI mode */ | |
40 | #endif | |
41 | ||
d116e812 | 42 | #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x) |
669e846e | 43 | struct kvm_stats_debugfs_item debugfs_entries[] = { |
d116e812 DZ |
44 | { "wait", VCPU_STAT(wait_exits), KVM_STAT_VCPU }, |
45 | { "cache", VCPU_STAT(cache_exits), KVM_STAT_VCPU }, | |
46 | { "signal", VCPU_STAT(signal_exits), KVM_STAT_VCPU }, | |
47 | { "interrupt", VCPU_STAT(int_exits), KVM_STAT_VCPU }, | |
48 | { "cop_unsuable", VCPU_STAT(cop_unusable_exits), KVM_STAT_VCPU }, | |
49 | { "tlbmod", VCPU_STAT(tlbmod_exits), KVM_STAT_VCPU }, | |
50 | { "tlbmiss_ld", VCPU_STAT(tlbmiss_ld_exits), KVM_STAT_VCPU }, | |
51 | { "tlbmiss_st", VCPU_STAT(tlbmiss_st_exits), KVM_STAT_VCPU }, | |
52 | { "addrerr_st", VCPU_STAT(addrerr_st_exits), KVM_STAT_VCPU }, | |
53 | { "addrerr_ld", VCPU_STAT(addrerr_ld_exits), KVM_STAT_VCPU }, | |
54 | { "syscall", VCPU_STAT(syscall_exits), KVM_STAT_VCPU }, | |
55 | { "resvd_inst", VCPU_STAT(resvd_inst_exits), KVM_STAT_VCPU }, | |
56 | { "break_inst", VCPU_STAT(break_inst_exits), KVM_STAT_VCPU }, | |
0a560427 | 57 | { "trap_inst", VCPU_STAT(trap_inst_exits), KVM_STAT_VCPU }, |
c2537ed9 | 58 | { "msa_fpe", VCPU_STAT(msa_fpe_exits), KVM_STAT_VCPU }, |
1c0cd66a | 59 | { "fpe", VCPU_STAT(fpe_exits), KVM_STAT_VCPU }, |
c2537ed9 | 60 | { "msa_disabled", VCPU_STAT(msa_disabled_exits), KVM_STAT_VCPU }, |
d116e812 | 61 | { "flush_dcache", VCPU_STAT(flush_dcache_exits), KVM_STAT_VCPU }, |
a7244920 JH |
62 | #ifdef CONFIG_KVM_MIPS_VZ |
63 | { "vz_gpsi", VCPU_STAT(vz_gpsi_exits), KVM_STAT_VCPU }, | |
64 | { "vz_gsfc", VCPU_STAT(vz_gsfc_exits), KVM_STAT_VCPU }, | |
65 | { "vz_hc", VCPU_STAT(vz_hc_exits), KVM_STAT_VCPU }, | |
66 | { "vz_grr", VCPU_STAT(vz_grr_exits), KVM_STAT_VCPU }, | |
67 | { "vz_gva", VCPU_STAT(vz_gva_exits), KVM_STAT_VCPU }, | |
68 | { "vz_ghfc", VCPU_STAT(vz_ghfc_exits), KVM_STAT_VCPU }, | |
69 | { "vz_gpa", VCPU_STAT(vz_gpa_exits), KVM_STAT_VCPU }, | |
70 | { "vz_resvd", VCPU_STAT(vz_resvd_exits), KVM_STAT_VCPU }, | |
71 | #endif | |
f7819512 | 72 | { "halt_successful_poll", VCPU_STAT(halt_successful_poll), KVM_STAT_VCPU }, |
62bea5bf | 73 | { "halt_attempted_poll", VCPU_STAT(halt_attempted_poll), KVM_STAT_VCPU }, |
3491caf2 | 74 | { "halt_poll_invalid", VCPU_STAT(halt_poll_invalid), KVM_STAT_VCPU }, |
d116e812 | 75 | { "halt_wakeup", VCPU_STAT(halt_wakeup), KVM_STAT_VCPU }, |
669e846e SL |
76 | {NULL} |
77 | }; | |
78 | ||
edec9d7b JH |
79 | bool kvm_trace_guest_mode_change; |
80 | ||
81 | int kvm_guest_mode_change_trace_reg(void) | |
82 | { | |
83 | kvm_trace_guest_mode_change = 1; | |
84 | return 0; | |
85 | } | |
86 | ||
87 | void kvm_guest_mode_change_trace_unreg(void) | |
88 | { | |
89 | kvm_trace_guest_mode_change = 0; | |
90 | } | |
91 | ||
d116e812 DZ |
92 | /* |
93 | * XXXKYMA: We are simulatoring a processor that has the WII bit set in | |
94 | * Config7, so we are "runnable" if interrupts are pending | |
669e846e SL |
95 | */ |
96 | int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) | |
97 | { | |
98 | return !!(vcpu->arch.pending_exceptions); | |
99 | } | |
100 | ||
199b5763 LM |
101 | bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu) |
102 | { | |
103 | return false; | |
104 | } | |
105 | ||
669e846e SL |
106 | int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) |
107 | { | |
108 | return 1; | |
109 | } | |
110 | ||
13a34e06 | 111 | int kvm_arch_hardware_enable(void) |
669e846e | 112 | { |
edab4fe1 JH |
113 | return kvm_mips_callbacks->hardware_enable(); |
114 | } | |
115 | ||
116 | void kvm_arch_hardware_disable(void) | |
117 | { | |
118 | kvm_mips_callbacks->hardware_disable(); | |
669e846e SL |
119 | } |
120 | ||
669e846e SL |
121 | int kvm_arch_hardware_setup(void) |
122 | { | |
123 | return 0; | |
124 | } | |
125 | ||
669e846e SL |
126 | void kvm_arch_check_processor_compat(void *rtn) |
127 | { | |
d98403a5 | 128 | *(int *)rtn = 0; |
669e846e SL |
129 | } |
130 | ||
669e846e SL |
131 | int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) |
132 | { | |
a8a3c426 | 133 | switch (type) { |
c992a4f6 JH |
134 | #ifdef CONFIG_KVM_MIPS_VZ |
135 | case KVM_VM_MIPS_VZ: | |
136 | #else | |
a8a3c426 | 137 | case KVM_VM_MIPS_TE: |
c992a4f6 | 138 | #endif |
a8a3c426 JH |
139 | break; |
140 | default: | |
141 | /* Unsupported KVM type */ | |
142 | return -EINVAL; | |
143 | }; | |
144 | ||
06c158c9 JH |
145 | /* Allocate page table to map GPA -> RPA */ |
146 | kvm->arch.gpa_mm.pgd = kvm_pgd_alloc(); | |
147 | if (!kvm->arch.gpa_mm.pgd) | |
148 | return -ENOMEM; | |
149 | ||
669e846e SL |
150 | return 0; |
151 | } | |
152 | ||
235539b4 LC |
153 | bool kvm_arch_has_vcpu_debugfs(void) |
154 | { | |
155 | return false; | |
156 | } | |
157 | ||
158 | int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu) | |
159 | { | |
160 | return 0; | |
161 | } | |
162 | ||
669e846e SL |
163 | void kvm_mips_free_vcpus(struct kvm *kvm) |
164 | { | |
165 | unsigned int i; | |
166 | struct kvm_vcpu *vcpu; | |
167 | ||
669e846e SL |
168 | kvm_for_each_vcpu(i, vcpu, kvm) { |
169 | kvm_arch_vcpu_free(vcpu); | |
170 | } | |
171 | ||
172 | mutex_lock(&kvm->lock); | |
173 | ||
174 | for (i = 0; i < atomic_read(&kvm->online_vcpus); i++) | |
175 | kvm->vcpus[i] = NULL; | |
176 | ||
177 | atomic_set(&kvm->online_vcpus, 0); | |
178 | ||
179 | mutex_unlock(&kvm->lock); | |
180 | } | |
181 | ||
06c158c9 JH |
182 | static void kvm_mips_free_gpa_pt(struct kvm *kvm) |
183 | { | |
184 | /* It should always be safe to remove after flushing the whole range */ | |
185 | WARN_ON(!kvm_mips_flush_gpa_pt(kvm, 0, ~0)); | |
186 | pgd_free(NULL, kvm->arch.gpa_mm.pgd); | |
187 | } | |
188 | ||
669e846e SL |
189 | void kvm_arch_destroy_vm(struct kvm *kvm) |
190 | { | |
191 | kvm_mips_free_vcpus(kvm); | |
06c158c9 | 192 | kvm_mips_free_gpa_pt(kvm); |
669e846e SL |
193 | } |
194 | ||
d116e812 DZ |
195 | long kvm_arch_dev_ioctl(struct file *filp, unsigned int ioctl, |
196 | unsigned long arg) | |
669e846e | 197 | { |
ed829857 | 198 | return -ENOIOCTLCMD; |
669e846e SL |
199 | } |
200 | ||
5587027c AK |
201 | int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot, |
202 | unsigned long npages) | |
669e846e SL |
203 | { |
204 | return 0; | |
205 | } | |
206 | ||
b6209110 JH |
207 | void kvm_arch_flush_shadow_all(struct kvm *kvm) |
208 | { | |
209 | /* Flush whole GPA */ | |
210 | kvm_mips_flush_gpa_pt(kvm, 0, ~0); | |
211 | ||
212 | /* Let implementation do the rest */ | |
213 | kvm_mips_callbacks->flush_shadow_all(kvm); | |
214 | } | |
215 | ||
216 | void kvm_arch_flush_shadow_memslot(struct kvm *kvm, | |
217 | struct kvm_memory_slot *slot) | |
218 | { | |
219 | /* | |
220 | * The slot has been made invalid (ready for moving or deletion), so we | |
221 | * need to ensure that it can no longer be accessed by any guest VCPUs. | |
222 | */ | |
223 | ||
224 | spin_lock(&kvm->mmu_lock); | |
225 | /* Flush slot from GPA */ | |
226 | kvm_mips_flush_gpa_pt(kvm, slot->base_gfn, | |
227 | slot->base_gfn + slot->npages - 1); | |
228 | /* Let implementation do the rest */ | |
229 | kvm_mips_callbacks->flush_shadow_memslot(kvm, slot); | |
230 | spin_unlock(&kvm->mmu_lock); | |
231 | } | |
232 | ||
669e846e | 233 | int kvm_arch_prepare_memory_region(struct kvm *kvm, |
d116e812 | 234 | struct kvm_memory_slot *memslot, |
09170a49 | 235 | const struct kvm_userspace_memory_region *mem, |
d116e812 | 236 | enum kvm_mr_change change) |
669e846e SL |
237 | { |
238 | return 0; | |
239 | } | |
240 | ||
241 | void kvm_arch_commit_memory_region(struct kvm *kvm, | |
09170a49 | 242 | const struct kvm_userspace_memory_region *mem, |
d116e812 | 243 | const struct kvm_memory_slot *old, |
f36f3f28 | 244 | const struct kvm_memory_slot *new, |
d116e812 | 245 | enum kvm_mr_change change) |
669e846e | 246 | { |
a1ac9e17 JH |
247 | int needs_flush; |
248 | ||
669e846e SL |
249 | kvm_debug("%s: kvm: %p slot: %d, GPA: %llx, size: %llx, QVA: %llx\n", |
250 | __func__, kvm, mem->slot, mem->guest_phys_addr, | |
251 | mem->memory_size, mem->userspace_addr); | |
a1ac9e17 JH |
252 | |
253 | /* | |
254 | * If dirty page logging is enabled, write protect all pages in the slot | |
255 | * ready for dirty logging. | |
256 | * | |
257 | * There is no need to do this in any of the following cases: | |
258 | * CREATE: No dirty mappings will already exist. | |
259 | * MOVE/DELETE: The old mappings will already have been cleaned up by | |
260 | * kvm_arch_flush_shadow_memslot() | |
261 | */ | |
262 | if (change == KVM_MR_FLAGS_ONLY && | |
263 | (!(old->flags & KVM_MEM_LOG_DIRTY_PAGES) && | |
264 | new->flags & KVM_MEM_LOG_DIRTY_PAGES)) { | |
265 | spin_lock(&kvm->mmu_lock); | |
266 | /* Write protect GPA page table entries */ | |
267 | needs_flush = kvm_mips_mkclean_gpa_pt(kvm, new->base_gfn, | |
268 | new->base_gfn + new->npages - 1); | |
269 | /* Let implementation do the rest */ | |
270 | if (needs_flush) | |
271 | kvm_mips_callbacks->flush_shadow_memslot(kvm, new); | |
272 | spin_unlock(&kvm->mmu_lock); | |
273 | } | |
669e846e SL |
274 | } |
275 | ||
d7b8f890 JH |
276 | static inline void dump_handler(const char *symbol, void *start, void *end) |
277 | { | |
278 | u32 *p; | |
279 | ||
280 | pr_debug("LEAF(%s)\n", symbol); | |
281 | ||
282 | pr_debug("\t.set push\n"); | |
283 | pr_debug("\t.set noreorder\n"); | |
284 | ||
285 | for (p = start; p < (u32 *)end; ++p) | |
286 | pr_debug("\t.word\t0x%08x\t\t# %p\n", *p, p); | |
287 | ||
288 | pr_debug("\t.set\tpop\n"); | |
289 | ||
290 | pr_debug("\tEND(%s)\n", symbol); | |
291 | } | |
292 | ||
669e846e SL |
293 | struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) |
294 | { | |
90e9311a | 295 | int err, size; |
a7cfa7ac | 296 | void *gebase, *p, *handler, *refill_start, *refill_end; |
669e846e SL |
297 | int i; |
298 | ||
299 | struct kvm_vcpu *vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL); | |
300 | ||
301 | if (!vcpu) { | |
302 | err = -ENOMEM; | |
303 | goto out; | |
304 | } | |
305 | ||
306 | err = kvm_vcpu_init(vcpu, kvm, id); | |
307 | ||
308 | if (err) | |
309 | goto out_free_cpu; | |
310 | ||
6e95bfd2 | 311 | kvm_debug("kvm @ %p: create cpu %d at %p\n", kvm, id, vcpu); |
669e846e | 312 | |
d116e812 DZ |
313 | /* |
314 | * Allocate space for host mode exception handlers that handle | |
669e846e SL |
315 | * guest mode exits |
316 | */ | |
d116e812 | 317 | if (cpu_has_veic || cpu_has_vint) |
669e846e | 318 | size = 0x200 + VECTORSPACING * 64; |
d116e812 | 319 | else |
7006e2df | 320 | size = 0x4000; |
669e846e | 321 | |
669e846e SL |
322 | gebase = kzalloc(ALIGN(size, PAGE_SIZE), GFP_KERNEL); |
323 | ||
324 | if (!gebase) { | |
325 | err = -ENOMEM; | |
585bb8f9 | 326 | goto out_uninit_cpu; |
669e846e | 327 | } |
6e95bfd2 JH |
328 | kvm_debug("Allocated %d bytes for KVM Exception Handlers @ %p\n", |
329 | ALIGN(size, PAGE_SIZE), gebase); | |
669e846e | 330 | |
2a06dab8 JH |
331 | /* |
332 | * Check new ebase actually fits in CP0_EBase. The lack of a write gate | |
333 | * limits us to the low 512MB of physical address space. If the memory | |
334 | * we allocate is out of range, just give up now. | |
335 | */ | |
336 | if (!cpu_has_ebase_wg && virt_to_phys(gebase) >= 0x20000000) { | |
337 | kvm_err("CP0_EBase.WG required for guest exception base %pK\n", | |
338 | gebase); | |
339 | err = -ENOMEM; | |
340 | goto out_free_gebase; | |
341 | } | |
342 | ||
669e846e SL |
343 | /* Save new ebase */ |
344 | vcpu->arch.guest_ebase = gebase; | |
345 | ||
90e9311a | 346 | /* Build guest exception vectors dynamically in unmapped memory */ |
1f9ca62c | 347 | handler = gebase + 0x2000; |
669e846e | 348 | |
1934a3ad | 349 | /* TLB refill (or XTLB refill on 64-bit VZ where KX=1) */ |
a7cfa7ac | 350 | refill_start = gebase; |
1934a3ad JH |
351 | if (IS_ENABLED(CONFIG_KVM_MIPS_VZ) && IS_ENABLED(CONFIG_64BIT)) |
352 | refill_start += 0x080; | |
a7cfa7ac | 353 | refill_end = kvm_mips_build_tlb_refill_exception(refill_start, handler); |
669e846e SL |
354 | |
355 | /* General Exception Entry point */ | |
1f9ca62c | 356 | kvm_mips_build_exception(gebase + 0x180, handler); |
669e846e SL |
357 | |
358 | /* For vectored interrupts poke the exception code @ all offsets 0-7 */ | |
359 | for (i = 0; i < 8; i++) { | |
360 | kvm_debug("L1 Vectored handler @ %p\n", | |
361 | gebase + 0x200 + (i * VECTORSPACING)); | |
1f9ca62c JH |
362 | kvm_mips_build_exception(gebase + 0x200 + i * VECTORSPACING, |
363 | handler); | |
669e846e SL |
364 | } |
365 | ||
90e9311a | 366 | /* General exit handler */ |
1f9ca62c | 367 | p = handler; |
90e9311a JH |
368 | p = kvm_mips_build_exit(p); |
369 | ||
370 | /* Guest entry routine */ | |
371 | vcpu->arch.vcpu_run = p; | |
372 | p = kvm_mips_build_vcpu_run(p); | |
797179bc | 373 | |
d7b8f890 JH |
374 | /* Dump the generated code */ |
375 | pr_debug("#include <asm/asm.h>\n"); | |
376 | pr_debug("#include <asm/regdef.h>\n"); | |
377 | pr_debug("\n"); | |
378 | dump_handler("kvm_vcpu_run", vcpu->arch.vcpu_run, p); | |
a7cfa7ac | 379 | dump_handler("kvm_tlb_refill", refill_start, refill_end); |
d7b8f890 JH |
380 | dump_handler("kvm_gen_exc", gebase + 0x180, gebase + 0x200); |
381 | dump_handler("kvm_exit", gebase + 0x2000, vcpu->arch.vcpu_run); | |
382 | ||
669e846e | 383 | /* Invalidate the icache for these ranges */ |
32eb12a6 JH |
384 | flush_icache_range((unsigned long)gebase, |
385 | (unsigned long)gebase + ALIGN(size, PAGE_SIZE)); | |
669e846e | 386 | |
d116e812 DZ |
387 | /* |
388 | * Allocate comm page for guest kernel, a TLB will be reserved for | |
389 | * mapping GVA @ 0xFFFF8000 to this page | |
390 | */ | |
669e846e SL |
391 | vcpu->arch.kseg0_commpage = kzalloc(PAGE_SIZE << 1, GFP_KERNEL); |
392 | ||
393 | if (!vcpu->arch.kseg0_commpage) { | |
394 | err = -ENOMEM; | |
395 | goto out_free_gebase; | |
396 | } | |
397 | ||
6e95bfd2 | 398 | kvm_debug("Allocated COMM page @ %p\n", vcpu->arch.kseg0_commpage); |
669e846e SL |
399 | kvm_mips_commpage_init(vcpu); |
400 | ||
401 | /* Init */ | |
402 | vcpu->arch.last_sched_cpu = -1; | |
c992a4f6 | 403 | vcpu->arch.last_exec_cpu = -1; |
669e846e | 404 | |
669e846e SL |
405 | return vcpu; |
406 | ||
407 | out_free_gebase: | |
408 | kfree(gebase); | |
409 | ||
585bb8f9 JH |
410 | out_uninit_cpu: |
411 | kvm_vcpu_uninit(vcpu); | |
412 | ||
669e846e SL |
413 | out_free_cpu: |
414 | kfree(vcpu); | |
415 | ||
416 | out: | |
417 | return ERR_PTR(err); | |
418 | } | |
419 | ||
420 | void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu) | |
421 | { | |
422 | hrtimer_cancel(&vcpu->arch.comparecount_timer); | |
423 | ||
424 | kvm_vcpu_uninit(vcpu); | |
425 | ||
426 | kvm_mips_dump_stats(vcpu); | |
427 | ||
aba85929 | 428 | kvm_mmu_free_memory_caches(vcpu); |
c6c0a663 JH |
429 | kfree(vcpu->arch.guest_ebase); |
430 | kfree(vcpu->arch.kseg0_commpage); | |
8c9eb041 | 431 | kfree(vcpu); |
669e846e SL |
432 | } |
433 | ||
434 | void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) | |
435 | { | |
436 | kvm_arch_vcpu_free(vcpu); | |
437 | } | |
438 | ||
d116e812 DZ |
439 | int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, |
440 | struct kvm_guest_debug *dbg) | |
669e846e | 441 | { |
ed829857 | 442 | return -ENOIOCTLCMD; |
669e846e SL |
443 | } |
444 | ||
445 | int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
446 | { | |
460df4c1 | 447 | int r = -EINTR; |
669e846e | 448 | |
20b7035c | 449 | kvm_sigset_activate(vcpu); |
669e846e SL |
450 | |
451 | if (vcpu->mmio_needed) { | |
452 | if (!vcpu->mmio_is_write) | |
453 | kvm_mips_complete_mmio_load(vcpu, run); | |
454 | vcpu->mmio_needed = 0; | |
455 | } | |
456 | ||
460df4c1 PB |
457 | if (run->immediate_exit) |
458 | goto out; | |
459 | ||
f798217d JH |
460 | lose_fpu(1); |
461 | ||
044f0f03 | 462 | local_irq_disable(); |
6edaa530 | 463 | guest_enter_irqoff(); |
93258604 | 464 | trace_kvm_enter(vcpu); |
25b08c7f | 465 | |
4841e0dd JH |
466 | /* |
467 | * Make sure the read of VCPU requests in vcpu_run() callback is not | |
468 | * reordered ahead of the write to vcpu->mode, or we could miss a TLB | |
469 | * flush request while the requester sees the VCPU as outside of guest | |
470 | * mode and not needing an IPI. | |
471 | */ | |
472 | smp_store_mb(vcpu->mode, IN_GUEST_MODE); | |
473 | ||
a2c046e4 | 474 | r = kvm_mips_callbacks->vcpu_run(run, vcpu); |
25b08c7f | 475 | |
93258604 | 476 | trace_kvm_out(vcpu); |
6edaa530 | 477 | guest_exit_irqoff(); |
669e846e SL |
478 | local_irq_enable(); |
479 | ||
460df4c1 | 480 | out: |
20b7035c | 481 | kvm_sigset_deactivate(vcpu); |
669e846e SL |
482 | |
483 | return r; | |
484 | } | |
485 | ||
d116e812 DZ |
486 | int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, |
487 | struct kvm_mips_interrupt *irq) | |
669e846e SL |
488 | { |
489 | int intr = (int)irq->irq; | |
490 | struct kvm_vcpu *dvcpu = NULL; | |
491 | ||
492 | if (intr == 3 || intr == -3 || intr == 4 || intr == -4) | |
493 | kvm_debug("%s: CPU: %d, INTR: %d\n", __func__, irq->cpu, | |
494 | (int)intr); | |
495 | ||
496 | if (irq->cpu == -1) | |
497 | dvcpu = vcpu; | |
498 | else | |
499 | dvcpu = vcpu->kvm->vcpus[irq->cpu]; | |
500 | ||
501 | if (intr == 2 || intr == 3 || intr == 4) { | |
502 | kvm_mips_callbacks->queue_io_int(dvcpu, irq); | |
503 | ||
504 | } else if (intr == -2 || intr == -3 || intr == -4) { | |
505 | kvm_mips_callbacks->dequeue_io_int(dvcpu, irq); | |
506 | } else { | |
507 | kvm_err("%s: invalid interrupt ioctl (%d:%d)\n", __func__, | |
508 | irq->cpu, irq->irq); | |
509 | return -EINVAL; | |
510 | } | |
511 | ||
512 | dvcpu->arch.wait = 0; | |
513 | ||
4c0b4bc6 | 514 | if (swq_has_sleeper(&dvcpu->wq)) |
8577370f | 515 | swake_up(&dvcpu->wq); |
669e846e SL |
516 | |
517 | return 0; | |
518 | } | |
519 | ||
d116e812 DZ |
520 | int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, |
521 | struct kvm_mp_state *mp_state) | |
669e846e | 522 | { |
ed829857 | 523 | return -ENOIOCTLCMD; |
669e846e SL |
524 | } |
525 | ||
d116e812 DZ |
526 | int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, |
527 | struct kvm_mp_state *mp_state) | |
669e846e | 528 | { |
ed829857 | 529 | return -ENOIOCTLCMD; |
669e846e SL |
530 | } |
531 | ||
4c73fb2b DD |
532 | static u64 kvm_mips_get_one_regs[] = { |
533 | KVM_REG_MIPS_R0, | |
534 | KVM_REG_MIPS_R1, | |
535 | KVM_REG_MIPS_R2, | |
536 | KVM_REG_MIPS_R3, | |
537 | KVM_REG_MIPS_R4, | |
538 | KVM_REG_MIPS_R5, | |
539 | KVM_REG_MIPS_R6, | |
540 | KVM_REG_MIPS_R7, | |
541 | KVM_REG_MIPS_R8, | |
542 | KVM_REG_MIPS_R9, | |
543 | KVM_REG_MIPS_R10, | |
544 | KVM_REG_MIPS_R11, | |
545 | KVM_REG_MIPS_R12, | |
546 | KVM_REG_MIPS_R13, | |
547 | KVM_REG_MIPS_R14, | |
548 | KVM_REG_MIPS_R15, | |
549 | KVM_REG_MIPS_R16, | |
550 | KVM_REG_MIPS_R17, | |
551 | KVM_REG_MIPS_R18, | |
552 | KVM_REG_MIPS_R19, | |
553 | KVM_REG_MIPS_R20, | |
554 | KVM_REG_MIPS_R21, | |
555 | KVM_REG_MIPS_R22, | |
556 | KVM_REG_MIPS_R23, | |
557 | KVM_REG_MIPS_R24, | |
558 | KVM_REG_MIPS_R25, | |
559 | KVM_REG_MIPS_R26, | |
560 | KVM_REG_MIPS_R27, | |
561 | KVM_REG_MIPS_R28, | |
562 | KVM_REG_MIPS_R29, | |
563 | KVM_REG_MIPS_R30, | |
564 | KVM_REG_MIPS_R31, | |
565 | ||
70e92c7e | 566 | #ifndef CONFIG_CPU_MIPSR6 |
4c73fb2b DD |
567 | KVM_REG_MIPS_HI, |
568 | KVM_REG_MIPS_LO, | |
70e92c7e | 569 | #endif |
4c73fb2b | 570 | KVM_REG_MIPS_PC, |
4c73fb2b DD |
571 | }; |
572 | ||
e5775930 JH |
573 | static u64 kvm_mips_get_one_regs_fpu[] = { |
574 | KVM_REG_MIPS_FCR_IR, | |
575 | KVM_REG_MIPS_FCR_CSR, | |
576 | }; | |
577 | ||
578 | static u64 kvm_mips_get_one_regs_msa[] = { | |
579 | KVM_REG_MIPS_MSA_IR, | |
580 | KVM_REG_MIPS_MSA_CSR, | |
581 | }; | |
582 | ||
f5c43bd4 JH |
583 | static unsigned long kvm_mips_num_regs(struct kvm_vcpu *vcpu) |
584 | { | |
585 | unsigned long ret; | |
586 | ||
587 | ret = ARRAY_SIZE(kvm_mips_get_one_regs); | |
e5775930 JH |
588 | if (kvm_mips_guest_can_have_fpu(&vcpu->arch)) { |
589 | ret += ARRAY_SIZE(kvm_mips_get_one_regs_fpu) + 48; | |
590 | /* odd doubles */ | |
591 | if (boot_cpu_data.fpu_id & MIPS_FPIR_F64) | |
592 | ret += 16; | |
593 | } | |
594 | if (kvm_mips_guest_can_have_msa(&vcpu->arch)) | |
595 | ret += ARRAY_SIZE(kvm_mips_get_one_regs_msa) + 32; | |
f5c43bd4 JH |
596 | ret += kvm_mips_callbacks->num_regs(vcpu); |
597 | ||
598 | return ret; | |
599 | } | |
600 | ||
601 | static int kvm_mips_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices) | |
602 | { | |
e5775930 JH |
603 | u64 index; |
604 | unsigned int i; | |
605 | ||
f5c43bd4 JH |
606 | if (copy_to_user(indices, kvm_mips_get_one_regs, |
607 | sizeof(kvm_mips_get_one_regs))) | |
608 | return -EFAULT; | |
609 | indices += ARRAY_SIZE(kvm_mips_get_one_regs); | |
610 | ||
e5775930 JH |
611 | if (kvm_mips_guest_can_have_fpu(&vcpu->arch)) { |
612 | if (copy_to_user(indices, kvm_mips_get_one_regs_fpu, | |
613 | sizeof(kvm_mips_get_one_regs_fpu))) | |
614 | return -EFAULT; | |
615 | indices += ARRAY_SIZE(kvm_mips_get_one_regs_fpu); | |
616 | ||
617 | for (i = 0; i < 32; ++i) { | |
618 | index = KVM_REG_MIPS_FPR_32(i); | |
619 | if (copy_to_user(indices, &index, sizeof(index))) | |
620 | return -EFAULT; | |
621 | ++indices; | |
622 | ||
623 | /* skip odd doubles if no F64 */ | |
624 | if (i & 1 && !(boot_cpu_data.fpu_id & MIPS_FPIR_F64)) | |
625 | continue; | |
626 | ||
627 | index = KVM_REG_MIPS_FPR_64(i); | |
628 | if (copy_to_user(indices, &index, sizeof(index))) | |
629 | return -EFAULT; | |
630 | ++indices; | |
631 | } | |
632 | } | |
633 | ||
634 | if (kvm_mips_guest_can_have_msa(&vcpu->arch)) { | |
635 | if (copy_to_user(indices, kvm_mips_get_one_regs_msa, | |
636 | sizeof(kvm_mips_get_one_regs_msa))) | |
637 | return -EFAULT; | |
638 | indices += ARRAY_SIZE(kvm_mips_get_one_regs_msa); | |
639 | ||
640 | for (i = 0; i < 32; ++i) { | |
641 | index = KVM_REG_MIPS_VEC_128(i); | |
642 | if (copy_to_user(indices, &index, sizeof(index))) | |
643 | return -EFAULT; | |
644 | ++indices; | |
645 | } | |
646 | } | |
647 | ||
f5c43bd4 JH |
648 | return kvm_mips_callbacks->copy_reg_indices(vcpu, indices); |
649 | } | |
650 | ||
4c73fb2b DD |
651 | static int kvm_mips_get_reg(struct kvm_vcpu *vcpu, |
652 | const struct kvm_one_reg *reg) | |
653 | { | |
4c73fb2b | 654 | struct mips_coproc *cop0 = vcpu->arch.cop0; |
379245cd | 655 | struct mips_fpu_struct *fpu = &vcpu->arch.fpu; |
f8be02da | 656 | int ret; |
4c73fb2b | 657 | s64 v; |
ab86bd60 | 658 | s64 vs[2]; |
379245cd | 659 | unsigned int idx; |
4c73fb2b DD |
660 | |
661 | switch (reg->id) { | |
379245cd | 662 | /* General purpose registers */ |
4c73fb2b DD |
663 | case KVM_REG_MIPS_R0 ... KVM_REG_MIPS_R31: |
664 | v = (long)vcpu->arch.gprs[reg->id - KVM_REG_MIPS_R0]; | |
665 | break; | |
70e92c7e | 666 | #ifndef CONFIG_CPU_MIPSR6 |
4c73fb2b DD |
667 | case KVM_REG_MIPS_HI: |
668 | v = (long)vcpu->arch.hi; | |
669 | break; | |
670 | case KVM_REG_MIPS_LO: | |
671 | v = (long)vcpu->arch.lo; | |
672 | break; | |
70e92c7e | 673 | #endif |
4c73fb2b DD |
674 | case KVM_REG_MIPS_PC: |
675 | v = (long)vcpu->arch.pc; | |
676 | break; | |
677 | ||
379245cd JH |
678 | /* Floating point registers */ |
679 | case KVM_REG_MIPS_FPR_32(0) ... KVM_REG_MIPS_FPR_32(31): | |
680 | if (!kvm_mips_guest_has_fpu(&vcpu->arch)) | |
681 | return -EINVAL; | |
682 | idx = reg->id - KVM_REG_MIPS_FPR_32(0); | |
683 | /* Odd singles in top of even double when FR=0 */ | |
684 | if (kvm_read_c0_guest_status(cop0) & ST0_FR) | |
685 | v = get_fpr32(&fpu->fpr[idx], 0); | |
686 | else | |
687 | v = get_fpr32(&fpu->fpr[idx & ~1], idx & 1); | |
688 | break; | |
689 | case KVM_REG_MIPS_FPR_64(0) ... KVM_REG_MIPS_FPR_64(31): | |
690 | if (!kvm_mips_guest_has_fpu(&vcpu->arch)) | |
691 | return -EINVAL; | |
692 | idx = reg->id - KVM_REG_MIPS_FPR_64(0); | |
693 | /* Can't access odd doubles in FR=0 mode */ | |
694 | if (idx & 1 && !(kvm_read_c0_guest_status(cop0) & ST0_FR)) | |
695 | return -EINVAL; | |
696 | v = get_fpr64(&fpu->fpr[idx], 0); | |
697 | break; | |
698 | case KVM_REG_MIPS_FCR_IR: | |
699 | if (!kvm_mips_guest_has_fpu(&vcpu->arch)) | |
700 | return -EINVAL; | |
701 | v = boot_cpu_data.fpu_id; | |
702 | break; | |
703 | case KVM_REG_MIPS_FCR_CSR: | |
704 | if (!kvm_mips_guest_has_fpu(&vcpu->arch)) | |
705 | return -EINVAL; | |
706 | v = fpu->fcr31; | |
707 | break; | |
708 | ||
ab86bd60 JH |
709 | /* MIPS SIMD Architecture (MSA) registers */ |
710 | case KVM_REG_MIPS_VEC_128(0) ... KVM_REG_MIPS_VEC_128(31): | |
711 | if (!kvm_mips_guest_has_msa(&vcpu->arch)) | |
712 | return -EINVAL; | |
713 | /* Can't access MSA registers in FR=0 mode */ | |
714 | if (!(kvm_read_c0_guest_status(cop0) & ST0_FR)) | |
715 | return -EINVAL; | |
716 | idx = reg->id - KVM_REG_MIPS_VEC_128(0); | |
717 | #ifdef CONFIG_CPU_LITTLE_ENDIAN | |
718 | /* least significant byte first */ | |
719 | vs[0] = get_fpr64(&fpu->fpr[idx], 0); | |
720 | vs[1] = get_fpr64(&fpu->fpr[idx], 1); | |
721 | #else | |
722 | /* most significant byte first */ | |
723 | vs[0] = get_fpr64(&fpu->fpr[idx], 1); | |
724 | vs[1] = get_fpr64(&fpu->fpr[idx], 0); | |
725 | #endif | |
726 | break; | |
727 | case KVM_REG_MIPS_MSA_IR: | |
728 | if (!kvm_mips_guest_has_msa(&vcpu->arch)) | |
729 | return -EINVAL; | |
730 | v = boot_cpu_data.msa_id; | |
731 | break; | |
732 | case KVM_REG_MIPS_MSA_CSR: | |
733 | if (!kvm_mips_guest_has_msa(&vcpu->arch)) | |
734 | return -EINVAL; | |
735 | v = fpu->msacsr; | |
736 | break; | |
737 | ||
f8be02da | 738 | /* registers to be handled specially */ |
cc68d22f | 739 | default: |
f8be02da JH |
740 | ret = kvm_mips_callbacks->get_one_reg(vcpu, reg, &v); |
741 | if (ret) | |
742 | return ret; | |
743 | break; | |
4c73fb2b | 744 | } |
681865d4 DD |
745 | if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) { |
746 | u64 __user *uaddr64 = (u64 __user *)(long)reg->addr; | |
d116e812 | 747 | |
681865d4 DD |
748 | return put_user(v, uaddr64); |
749 | } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) { | |
750 | u32 __user *uaddr32 = (u32 __user *)(long)reg->addr; | |
751 | u32 v32 = (u32)v; | |
d116e812 | 752 | |
681865d4 | 753 | return put_user(v32, uaddr32); |
ab86bd60 JH |
754 | } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U128) { |
755 | void __user *uaddr = (void __user *)(long)reg->addr; | |
756 | ||
0178fd7d | 757 | return copy_to_user(uaddr, vs, 16) ? -EFAULT : 0; |
681865d4 DD |
758 | } else { |
759 | return -EINVAL; | |
760 | } | |
4c73fb2b DD |
761 | } |
762 | ||
763 | static int kvm_mips_set_reg(struct kvm_vcpu *vcpu, | |
764 | const struct kvm_one_reg *reg) | |
765 | { | |
4c73fb2b | 766 | struct mips_coproc *cop0 = vcpu->arch.cop0; |
379245cd JH |
767 | struct mips_fpu_struct *fpu = &vcpu->arch.fpu; |
768 | s64 v; | |
ab86bd60 | 769 | s64 vs[2]; |
379245cd | 770 | unsigned int idx; |
4c73fb2b | 771 | |
681865d4 DD |
772 | if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) { |
773 | u64 __user *uaddr64 = (u64 __user *)(long)reg->addr; | |
774 | ||
775 | if (get_user(v, uaddr64) != 0) | |
776 | return -EFAULT; | |
777 | } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) { | |
778 | u32 __user *uaddr32 = (u32 __user *)(long)reg->addr; | |
779 | s32 v32; | |
780 | ||
781 | if (get_user(v32, uaddr32) != 0) | |
782 | return -EFAULT; | |
783 | v = (s64)v32; | |
ab86bd60 JH |
784 | } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U128) { |
785 | void __user *uaddr = (void __user *)(long)reg->addr; | |
786 | ||
0178fd7d | 787 | return copy_from_user(vs, uaddr, 16) ? -EFAULT : 0; |
681865d4 DD |
788 | } else { |
789 | return -EINVAL; | |
790 | } | |
4c73fb2b DD |
791 | |
792 | switch (reg->id) { | |
379245cd | 793 | /* General purpose registers */ |
4c73fb2b DD |
794 | case KVM_REG_MIPS_R0: |
795 | /* Silently ignore requests to set $0 */ | |
796 | break; | |
797 | case KVM_REG_MIPS_R1 ... KVM_REG_MIPS_R31: | |
798 | vcpu->arch.gprs[reg->id - KVM_REG_MIPS_R0] = v; | |
799 | break; | |
70e92c7e | 800 | #ifndef CONFIG_CPU_MIPSR6 |
4c73fb2b DD |
801 | case KVM_REG_MIPS_HI: |
802 | vcpu->arch.hi = v; | |
803 | break; | |
804 | case KVM_REG_MIPS_LO: | |
805 | vcpu->arch.lo = v; | |
806 | break; | |
70e92c7e | 807 | #endif |
4c73fb2b DD |
808 | case KVM_REG_MIPS_PC: |
809 | vcpu->arch.pc = v; | |
810 | break; | |
811 | ||
379245cd JH |
812 | /* Floating point registers */ |
813 | case KVM_REG_MIPS_FPR_32(0) ... KVM_REG_MIPS_FPR_32(31): | |
814 | if (!kvm_mips_guest_has_fpu(&vcpu->arch)) | |
815 | return -EINVAL; | |
816 | idx = reg->id - KVM_REG_MIPS_FPR_32(0); | |
817 | /* Odd singles in top of even double when FR=0 */ | |
818 | if (kvm_read_c0_guest_status(cop0) & ST0_FR) | |
819 | set_fpr32(&fpu->fpr[idx], 0, v); | |
820 | else | |
821 | set_fpr32(&fpu->fpr[idx & ~1], idx & 1, v); | |
822 | break; | |
823 | case KVM_REG_MIPS_FPR_64(0) ... KVM_REG_MIPS_FPR_64(31): | |
824 | if (!kvm_mips_guest_has_fpu(&vcpu->arch)) | |
825 | return -EINVAL; | |
826 | idx = reg->id - KVM_REG_MIPS_FPR_64(0); | |
827 | /* Can't access odd doubles in FR=0 mode */ | |
828 | if (idx & 1 && !(kvm_read_c0_guest_status(cop0) & ST0_FR)) | |
829 | return -EINVAL; | |
830 | set_fpr64(&fpu->fpr[idx], 0, v); | |
831 | break; | |
832 | case KVM_REG_MIPS_FCR_IR: | |
833 | if (!kvm_mips_guest_has_fpu(&vcpu->arch)) | |
834 | return -EINVAL; | |
835 | /* Read-only */ | |
836 | break; | |
837 | case KVM_REG_MIPS_FCR_CSR: | |
838 | if (!kvm_mips_guest_has_fpu(&vcpu->arch)) | |
839 | return -EINVAL; | |
840 | fpu->fcr31 = v; | |
841 | break; | |
842 | ||
ab86bd60 JH |
843 | /* MIPS SIMD Architecture (MSA) registers */ |
844 | case KVM_REG_MIPS_VEC_128(0) ... KVM_REG_MIPS_VEC_128(31): | |
845 | if (!kvm_mips_guest_has_msa(&vcpu->arch)) | |
846 | return -EINVAL; | |
847 | idx = reg->id - KVM_REG_MIPS_VEC_128(0); | |
848 | #ifdef CONFIG_CPU_LITTLE_ENDIAN | |
849 | /* least significant byte first */ | |
850 | set_fpr64(&fpu->fpr[idx], 0, vs[0]); | |
851 | set_fpr64(&fpu->fpr[idx], 1, vs[1]); | |
852 | #else | |
853 | /* most significant byte first */ | |
854 | set_fpr64(&fpu->fpr[idx], 1, vs[0]); | |
855 | set_fpr64(&fpu->fpr[idx], 0, vs[1]); | |
856 | #endif | |
857 | break; | |
858 | case KVM_REG_MIPS_MSA_IR: | |
859 | if (!kvm_mips_guest_has_msa(&vcpu->arch)) | |
860 | return -EINVAL; | |
861 | /* Read-only */ | |
862 | break; | |
863 | case KVM_REG_MIPS_MSA_CSR: | |
864 | if (!kvm_mips_guest_has_msa(&vcpu->arch)) | |
865 | return -EINVAL; | |
866 | fpu->msacsr = v; | |
867 | break; | |
868 | ||
f8be02da | 869 | /* registers to be handled specially */ |
4c73fb2b | 870 | default: |
cc68d22f | 871 | return kvm_mips_callbacks->set_one_reg(vcpu, reg, v); |
4c73fb2b DD |
872 | } |
873 | return 0; | |
874 | } | |
875 | ||
5fafd874 JH |
876 | static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu, |
877 | struct kvm_enable_cap *cap) | |
878 | { | |
879 | int r = 0; | |
880 | ||
881 | if (!kvm_vm_ioctl_check_extension(vcpu->kvm, cap->cap)) | |
882 | return -EINVAL; | |
883 | if (cap->flags) | |
884 | return -EINVAL; | |
885 | if (cap->args[0]) | |
886 | return -EINVAL; | |
887 | ||
888 | switch (cap->cap) { | |
889 | case KVM_CAP_MIPS_FPU: | |
890 | vcpu->arch.fpu_enabled = true; | |
891 | break; | |
d952bd07 JH |
892 | case KVM_CAP_MIPS_MSA: |
893 | vcpu->arch.msa_enabled = true; | |
894 | break; | |
5fafd874 JH |
895 | default: |
896 | r = -EINVAL; | |
897 | break; | |
898 | } | |
899 | ||
900 | return r; | |
901 | } | |
902 | ||
d116e812 DZ |
903 | long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl, |
904 | unsigned long arg) | |
669e846e SL |
905 | { |
906 | struct kvm_vcpu *vcpu = filp->private_data; | |
907 | void __user *argp = (void __user *)arg; | |
908 | long r; | |
669e846e SL |
909 | |
910 | switch (ioctl) { | |
4c73fb2b DD |
911 | case KVM_SET_ONE_REG: |
912 | case KVM_GET_ONE_REG: { | |
913 | struct kvm_one_reg reg; | |
d116e812 | 914 | |
4c73fb2b DD |
915 | if (copy_from_user(®, argp, sizeof(reg))) |
916 | return -EFAULT; | |
917 | if (ioctl == KVM_SET_ONE_REG) | |
918 | return kvm_mips_set_reg(vcpu, ®); | |
919 | else | |
920 | return kvm_mips_get_reg(vcpu, ®); | |
921 | } | |
922 | case KVM_GET_REG_LIST: { | |
923 | struct kvm_reg_list __user *user_list = argp; | |
4c73fb2b DD |
924 | struct kvm_reg_list reg_list; |
925 | unsigned n; | |
926 | ||
927 | if (copy_from_user(®_list, user_list, sizeof(reg_list))) | |
928 | return -EFAULT; | |
929 | n = reg_list.n; | |
f5c43bd4 | 930 | reg_list.n = kvm_mips_num_regs(vcpu); |
4c73fb2b DD |
931 | if (copy_to_user(user_list, ®_list, sizeof(reg_list))) |
932 | return -EFAULT; | |
933 | if (n < reg_list.n) | |
934 | return -E2BIG; | |
f5c43bd4 | 935 | return kvm_mips_copy_reg_indices(vcpu, user_list->reg); |
4c73fb2b | 936 | } |
669e846e SL |
937 | case KVM_INTERRUPT: |
938 | { | |
939 | struct kvm_mips_interrupt irq; | |
d116e812 | 940 | |
669e846e | 941 | if (copy_from_user(&irq, argp, sizeof(irq))) |
5a6da5f7 | 942 | return -EFAULT; |
669e846e SL |
943 | kvm_debug("[%d] %s: irq: %d\n", vcpu->vcpu_id, __func__, |
944 | irq.irq); | |
945 | ||
946 | r = kvm_vcpu_ioctl_interrupt(vcpu, &irq); | |
947 | break; | |
948 | } | |
5fafd874 JH |
949 | case KVM_ENABLE_CAP: { |
950 | struct kvm_enable_cap cap; | |
951 | ||
5fafd874 | 952 | if (copy_from_user(&cap, argp, sizeof(cap))) |
5a6da5f7 | 953 | return -EFAULT; |
5fafd874 JH |
954 | r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap); |
955 | break; | |
956 | } | |
669e846e | 957 | default: |
4c73fb2b | 958 | r = -ENOIOCTLCMD; |
669e846e | 959 | } |
669e846e SL |
960 | return r; |
961 | } | |
962 | ||
e88643ba JH |
963 | /** |
964 | * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot | |
965 | * @kvm: kvm instance | |
966 | * @log: slot id and address to which we copy the log | |
967 | * | |
968 | * Steps 1-4 below provide general overview of dirty page logging. See | |
969 | * kvm_get_dirty_log_protect() function description for additional details. | |
970 | * | |
971 | * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we | |
972 | * always flush the TLB (step 4) even if previous step failed and the dirty | |
973 | * bitmap may be corrupt. Regardless of previous outcome the KVM logging API | |
974 | * does not preclude user space subsequent dirty log read. Flushing TLB ensures | |
975 | * writes will be marked dirty for next log read. | |
976 | * | |
977 | * 1. Take a snapshot of the bit and clear it if needed. | |
978 | * 2. Write protect the corresponding page. | |
979 | * 3. Copy the snapshot to the userspace. | |
980 | * 4. Flush TLB's if needed. | |
981 | */ | |
669e846e SL |
982 | int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) |
983 | { | |
9f6b8029 | 984 | struct kvm_memslots *slots; |
669e846e | 985 | struct kvm_memory_slot *memslot; |
e88643ba | 986 | bool is_dirty = false; |
669e846e | 987 | int r; |
669e846e SL |
988 | |
989 | mutex_lock(&kvm->slots_lock); | |
990 | ||
e88643ba | 991 | r = kvm_get_dirty_log_protect(kvm, log, &is_dirty); |
669e846e | 992 | |
669e846e | 993 | if (is_dirty) { |
9f6b8029 PB |
994 | slots = kvm_memslots(kvm); |
995 | memslot = id_to_memslot(slots, log->slot); | |
669e846e | 996 | |
e88643ba JH |
997 | /* Let implementation handle TLB/GVA invalidation */ |
998 | kvm_mips_callbacks->flush_shadow_memslot(kvm, memslot); | |
669e846e SL |
999 | } |
1000 | ||
669e846e SL |
1001 | mutex_unlock(&kvm->slots_lock); |
1002 | return r; | |
669e846e SL |
1003 | } |
1004 | ||
1005 | long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) | |
1006 | { | |
1007 | long r; | |
1008 | ||
1009 | switch (ioctl) { | |
1010 | default: | |
ed829857 | 1011 | r = -ENOIOCTLCMD; |
669e846e SL |
1012 | } |
1013 | ||
1014 | return r; | |
1015 | } | |
1016 | ||
1017 | int kvm_arch_init(void *opaque) | |
1018 | { | |
669e846e SL |
1019 | if (kvm_mips_callbacks) { |
1020 | kvm_err("kvm: module already exists\n"); | |
1021 | return -EEXIST; | |
1022 | } | |
1023 | ||
d98403a5 | 1024 | return kvm_mips_emulation_init(&kvm_mips_callbacks); |
669e846e SL |
1025 | } |
1026 | ||
1027 | void kvm_arch_exit(void) | |
1028 | { | |
1029 | kvm_mips_callbacks = NULL; | |
1030 | } | |
1031 | ||
d116e812 DZ |
1032 | int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, |
1033 | struct kvm_sregs *sregs) | |
669e846e | 1034 | { |
ed829857 | 1035 | return -ENOIOCTLCMD; |
669e846e SL |
1036 | } |
1037 | ||
d116e812 DZ |
1038 | int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, |
1039 | struct kvm_sregs *sregs) | |
669e846e | 1040 | { |
ed829857 | 1041 | return -ENOIOCTLCMD; |
669e846e SL |
1042 | } |
1043 | ||
31928aa5 | 1044 | void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) |
669e846e | 1045 | { |
669e846e SL |
1046 | } |
1047 | ||
1048 | int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) | |
1049 | { | |
ed829857 | 1050 | return -ENOIOCTLCMD; |
669e846e SL |
1051 | } |
1052 | ||
1053 | int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) | |
1054 | { | |
ed829857 | 1055 | return -ENOIOCTLCMD; |
669e846e SL |
1056 | } |
1057 | ||
1058 | int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) | |
1059 | { | |
1060 | return VM_FAULT_SIGBUS; | |
1061 | } | |
1062 | ||
784aa3d7 | 1063 | int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) |
669e846e SL |
1064 | { |
1065 | int r; | |
1066 | ||
1067 | switch (ext) { | |
4c73fb2b | 1068 | case KVM_CAP_ONE_REG: |
5fafd874 | 1069 | case KVM_CAP_ENABLE_CAP: |
230c5724 | 1070 | case KVM_CAP_READONLY_MEM: |
411740f5 | 1071 | case KVM_CAP_SYNC_MMU: |
460df4c1 | 1072 | case KVM_CAP_IMMEDIATE_EXIT: |
4c73fb2b DD |
1073 | r = 1; |
1074 | break; | |
12ed1fae JH |
1075 | case KVM_CAP_NR_VCPUS: |
1076 | r = num_online_cpus(); | |
1077 | break; | |
1078 | case KVM_CAP_MAX_VCPUS: | |
1079 | r = KVM_MAX_VCPUS; | |
1080 | break; | |
5fafd874 | 1081 | case KVM_CAP_MIPS_FPU: |
556f2a52 JH |
1082 | /* We don't handle systems with inconsistent cpu_has_fpu */ |
1083 | r = !!raw_cpu_has_fpu; | |
5fafd874 | 1084 | break; |
d952bd07 JH |
1085 | case KVM_CAP_MIPS_MSA: |
1086 | /* | |
1087 | * We don't support MSA vector partitioning yet: | |
1088 | * 1) It would require explicit support which can't be tested | |
1089 | * yet due to lack of support in current hardware. | |
1090 | * 2) It extends the state that would need to be saved/restored | |
1091 | * by e.g. QEMU for migration. | |
1092 | * | |
1093 | * When vector partitioning hardware becomes available, support | |
1094 | * could be added by requiring a flag when enabling | |
1095 | * KVM_CAP_MIPS_MSA capability to indicate that userland knows | |
1096 | * to save/restore the appropriate extra state. | |
1097 | */ | |
1098 | r = cpu_has_msa && !(boot_cpu_data.msa_id & MSA_IR_WRPF); | |
1099 | break; | |
669e846e | 1100 | default: |
607ef2fd | 1101 | r = kvm_mips_callbacks->check_extension(kvm, ext); |
669e846e SL |
1102 | break; |
1103 | } | |
1104 | return r; | |
669e846e SL |
1105 | } |
1106 | ||
1107 | int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) | |
1108 | { | |
f4474d50 JH |
1109 | return kvm_mips_pending_timer(vcpu) || |
1110 | kvm_read_c0_guest_cause(vcpu->arch.cop0) & C_TI; | |
669e846e SL |
1111 | } |
1112 | ||
1113 | int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu) | |
1114 | { | |
1115 | int i; | |
1116 | struct mips_coproc *cop0; | |
1117 | ||
1118 | if (!vcpu) | |
1119 | return -1; | |
1120 | ||
6ad78a5c DZ |
1121 | kvm_debug("VCPU Register Dump:\n"); |
1122 | kvm_debug("\tpc = 0x%08lx\n", vcpu->arch.pc); | |
1123 | kvm_debug("\texceptions: %08lx\n", vcpu->arch.pending_exceptions); | |
669e846e SL |
1124 | |
1125 | for (i = 0; i < 32; i += 4) { | |
6ad78a5c | 1126 | kvm_debug("\tgpr%02d: %08lx %08lx %08lx %08lx\n", i, |
669e846e SL |
1127 | vcpu->arch.gprs[i], |
1128 | vcpu->arch.gprs[i + 1], | |
1129 | vcpu->arch.gprs[i + 2], vcpu->arch.gprs[i + 3]); | |
1130 | } | |
6ad78a5c DZ |
1131 | kvm_debug("\thi: 0x%08lx\n", vcpu->arch.hi); |
1132 | kvm_debug("\tlo: 0x%08lx\n", vcpu->arch.lo); | |
669e846e SL |
1133 | |
1134 | cop0 = vcpu->arch.cop0; | |
a27660f3 | 1135 | kvm_debug("\tStatus: 0x%08x, Cause: 0x%08x\n", |
6ad78a5c DZ |
1136 | kvm_read_c0_guest_status(cop0), |
1137 | kvm_read_c0_guest_cause(cop0)); | |
669e846e | 1138 | |
6ad78a5c | 1139 | kvm_debug("\tEPC: 0x%08lx\n", kvm_read_c0_guest_epc(cop0)); |
669e846e SL |
1140 | |
1141 | return 0; | |
1142 | } | |
1143 | ||
1144 | int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) | |
1145 | { | |
1146 | int i; | |
1147 | ||
8d17dd04 | 1148 | for (i = 1; i < ARRAY_SIZE(vcpu->arch.gprs); i++) |
bf32ebf6 | 1149 | vcpu->arch.gprs[i] = regs->gpr[i]; |
8d17dd04 | 1150 | vcpu->arch.gprs[0] = 0; /* zero is special, and cannot be set. */ |
669e846e SL |
1151 | vcpu->arch.hi = regs->hi; |
1152 | vcpu->arch.lo = regs->lo; | |
1153 | vcpu->arch.pc = regs->pc; | |
1154 | ||
4c73fb2b | 1155 | return 0; |
669e846e SL |
1156 | } |
1157 | ||
1158 | int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) | |
1159 | { | |
1160 | int i; | |
1161 | ||
8d17dd04 | 1162 | for (i = 0; i < ARRAY_SIZE(vcpu->arch.gprs); i++) |
bf32ebf6 | 1163 | regs->gpr[i] = vcpu->arch.gprs[i]; |
669e846e SL |
1164 | |
1165 | regs->hi = vcpu->arch.hi; | |
1166 | regs->lo = vcpu->arch.lo; | |
1167 | regs->pc = vcpu->arch.pc; | |
1168 | ||
4c73fb2b | 1169 | return 0; |
669e846e SL |
1170 | } |
1171 | ||
0fae34f4 | 1172 | static void kvm_mips_comparecount_func(unsigned long data) |
669e846e SL |
1173 | { |
1174 | struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data; | |
1175 | ||
1176 | kvm_mips_callbacks->queue_timer_int(vcpu); | |
1177 | ||
1178 | vcpu->arch.wait = 0; | |
4c0b4bc6 | 1179 | if (swq_has_sleeper(&vcpu->wq)) |
8577370f | 1180 | swake_up(&vcpu->wq); |
669e846e SL |
1181 | } |
1182 | ||
d116e812 | 1183 | /* low level hrtimer wake routine */ |
0fae34f4 | 1184 | static enum hrtimer_restart kvm_mips_comparecount_wakeup(struct hrtimer *timer) |
669e846e SL |
1185 | { |
1186 | struct kvm_vcpu *vcpu; | |
1187 | ||
1188 | vcpu = container_of(timer, struct kvm_vcpu, arch.comparecount_timer); | |
1189 | kvm_mips_comparecount_func((unsigned long) vcpu); | |
e30492bb | 1190 | return kvm_mips_count_timeout(vcpu); |
669e846e SL |
1191 | } |
1192 | ||
1193 | int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) | |
1194 | { | |
f7f1427d JH |
1195 | int err; |
1196 | ||
1197 | err = kvm_mips_callbacks->vcpu_init(vcpu); | |
1198 | if (err) | |
1199 | return err; | |
1200 | ||
669e846e SL |
1201 | hrtimer_init(&vcpu->arch.comparecount_timer, CLOCK_MONOTONIC, |
1202 | HRTIMER_MODE_REL); | |
1203 | vcpu->arch.comparecount_timer.function = kvm_mips_comparecount_wakeup; | |
669e846e SL |
1204 | return 0; |
1205 | } | |
1206 | ||
630766b3 JH |
1207 | void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) |
1208 | { | |
1209 | kvm_mips_callbacks->vcpu_uninit(vcpu); | |
1210 | } | |
1211 | ||
d116e812 DZ |
1212 | int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, |
1213 | struct kvm_translation *tr) | |
669e846e SL |
1214 | { |
1215 | return 0; | |
1216 | } | |
1217 | ||
1218 | /* Initial guest state */ | |
1219 | int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) | |
1220 | { | |
1221 | return kvm_mips_callbacks->vcpu_setup(vcpu); | |
1222 | } | |
1223 | ||
d116e812 | 1224 | static void kvm_mips_set_c0_status(void) |
669e846e | 1225 | { |
8cffd197 | 1226 | u32 status = read_c0_status(); |
669e846e | 1227 | |
669e846e SL |
1228 | if (cpu_has_dsp) |
1229 | status |= (ST0_MX); | |
1230 | ||
1231 | write_c0_status(status); | |
1232 | ehb(); | |
1233 | } | |
1234 | ||
1235 | /* | |
1236 | * Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV) | |
1237 | */ | |
1238 | int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu) | |
1239 | { | |
8cffd197 JH |
1240 | u32 cause = vcpu->arch.host_cp0_cause; |
1241 | u32 exccode = (cause >> CAUSEB_EXCCODE) & 0x1f; | |
1242 | u32 __user *opc = (u32 __user *) vcpu->arch.pc; | |
669e846e SL |
1243 | unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr; |
1244 | enum emulation_result er = EMULATE_DONE; | |
122e51d4 | 1245 | u32 inst; |
669e846e SL |
1246 | int ret = RESUME_GUEST; |
1247 | ||
4841e0dd JH |
1248 | vcpu->mode = OUTSIDE_GUEST_MODE; |
1249 | ||
c4c6f2ca | 1250 | /* re-enable HTW before enabling interrupts */ |
ea1bdbf6 JH |
1251 | if (!IS_ENABLED(CONFIG_KVM_MIPS_VZ)) |
1252 | htw_start(); | |
c4c6f2ca | 1253 | |
669e846e SL |
1254 | /* Set a default exit reason */ |
1255 | run->exit_reason = KVM_EXIT_UNKNOWN; | |
1256 | run->ready_for_interrupt_injection = 1; | |
1257 | ||
d116e812 DZ |
1258 | /* |
1259 | * Set the appropriate status bits based on host CPU features, | |
1260 | * before we hit the scheduler | |
1261 | */ | |
669e846e SL |
1262 | kvm_mips_set_c0_status(); |
1263 | ||
1264 | local_irq_enable(); | |
1265 | ||
1266 | kvm_debug("kvm_mips_handle_exit: cause: %#x, PC: %p, kvm_run: %p, kvm_vcpu: %p\n", | |
1267 | cause, opc, run, vcpu); | |
1e09e86a | 1268 | trace_kvm_exit(vcpu, exccode); |
669e846e | 1269 | |
ea1bdbf6 JH |
1270 | if (!IS_ENABLED(CONFIG_KVM_MIPS_VZ)) { |
1271 | /* | |
1272 | * Do a privilege check, if in UM most of these exit conditions | |
1273 | * end up causing an exception to be delivered to the Guest | |
1274 | * Kernel | |
1275 | */ | |
1276 | er = kvm_mips_check_privilege(cause, opc, run, vcpu); | |
1277 | if (er == EMULATE_PRIV_FAIL) { | |
1278 | goto skip_emul; | |
1279 | } else if (er == EMULATE_FAIL) { | |
1280 | run->exit_reason = KVM_EXIT_INTERNAL_ERROR; | |
1281 | ret = RESUME_HOST; | |
1282 | goto skip_emul; | |
1283 | } | |
669e846e SL |
1284 | } |
1285 | ||
1286 | switch (exccode) { | |
16d100db JH |
1287 | case EXCCODE_INT: |
1288 | kvm_debug("[%d]EXCCODE_INT @ %p\n", vcpu->vcpu_id, opc); | |
669e846e SL |
1289 | |
1290 | ++vcpu->stat.int_exits; | |
669e846e | 1291 | |
d116e812 | 1292 | if (need_resched()) |
669e846e | 1293 | cond_resched(); |
669e846e SL |
1294 | |
1295 | ret = RESUME_GUEST; | |
1296 | break; | |
1297 | ||
16d100db JH |
1298 | case EXCCODE_CPU: |
1299 | kvm_debug("EXCCODE_CPU: @ PC: %p\n", opc); | |
669e846e SL |
1300 | |
1301 | ++vcpu->stat.cop_unusable_exits; | |
669e846e SL |
1302 | ret = kvm_mips_callbacks->handle_cop_unusable(vcpu); |
1303 | /* XXXKYMA: Might need to return to user space */ | |
d116e812 | 1304 | if (run->exit_reason == KVM_EXIT_IRQ_WINDOW_OPEN) |
669e846e | 1305 | ret = RESUME_HOST; |
669e846e SL |
1306 | break; |
1307 | ||
16d100db | 1308 | case EXCCODE_MOD: |
669e846e | 1309 | ++vcpu->stat.tlbmod_exits; |
669e846e SL |
1310 | ret = kvm_mips_callbacks->handle_tlb_mod(vcpu); |
1311 | break; | |
1312 | ||
16d100db | 1313 | case EXCCODE_TLBS: |
a27660f3 | 1314 | kvm_debug("TLB ST fault: cause %#x, status %#x, PC: %p, BadVaddr: %#lx\n", |
d116e812 DZ |
1315 | cause, kvm_read_c0_guest_status(vcpu->arch.cop0), opc, |
1316 | badvaddr); | |
669e846e SL |
1317 | |
1318 | ++vcpu->stat.tlbmiss_st_exits; | |
669e846e SL |
1319 | ret = kvm_mips_callbacks->handle_tlb_st_miss(vcpu); |
1320 | break; | |
1321 | ||
16d100db | 1322 | case EXCCODE_TLBL: |
669e846e SL |
1323 | kvm_debug("TLB LD fault: cause %#x, PC: %p, BadVaddr: %#lx\n", |
1324 | cause, opc, badvaddr); | |
1325 | ||
1326 | ++vcpu->stat.tlbmiss_ld_exits; | |
669e846e SL |
1327 | ret = kvm_mips_callbacks->handle_tlb_ld_miss(vcpu); |
1328 | break; | |
1329 | ||
16d100db | 1330 | case EXCCODE_ADES: |
669e846e | 1331 | ++vcpu->stat.addrerr_st_exits; |
669e846e SL |
1332 | ret = kvm_mips_callbacks->handle_addr_err_st(vcpu); |
1333 | break; | |
1334 | ||
16d100db | 1335 | case EXCCODE_ADEL: |
669e846e | 1336 | ++vcpu->stat.addrerr_ld_exits; |
669e846e SL |
1337 | ret = kvm_mips_callbacks->handle_addr_err_ld(vcpu); |
1338 | break; | |
1339 | ||
16d100db | 1340 | case EXCCODE_SYS: |
669e846e | 1341 | ++vcpu->stat.syscall_exits; |
669e846e SL |
1342 | ret = kvm_mips_callbacks->handle_syscall(vcpu); |
1343 | break; | |
1344 | ||
16d100db | 1345 | case EXCCODE_RI: |
669e846e | 1346 | ++vcpu->stat.resvd_inst_exits; |
669e846e SL |
1347 | ret = kvm_mips_callbacks->handle_res_inst(vcpu); |
1348 | break; | |
1349 | ||
16d100db | 1350 | case EXCCODE_BP: |
669e846e | 1351 | ++vcpu->stat.break_inst_exits; |
669e846e SL |
1352 | ret = kvm_mips_callbacks->handle_break(vcpu); |
1353 | break; | |
1354 | ||
16d100db | 1355 | case EXCCODE_TR: |
0a560427 | 1356 | ++vcpu->stat.trap_inst_exits; |
0a560427 JH |
1357 | ret = kvm_mips_callbacks->handle_trap(vcpu); |
1358 | break; | |
1359 | ||
16d100db | 1360 | case EXCCODE_MSAFPE: |
c2537ed9 | 1361 | ++vcpu->stat.msa_fpe_exits; |
c2537ed9 JH |
1362 | ret = kvm_mips_callbacks->handle_msa_fpe(vcpu); |
1363 | break; | |
1364 | ||
16d100db | 1365 | case EXCCODE_FPE: |
1c0cd66a | 1366 | ++vcpu->stat.fpe_exits; |
1c0cd66a JH |
1367 | ret = kvm_mips_callbacks->handle_fpe(vcpu); |
1368 | break; | |
1369 | ||
16d100db | 1370 | case EXCCODE_MSADIS: |
c2537ed9 | 1371 | ++vcpu->stat.msa_disabled_exits; |
98119ad5 JH |
1372 | ret = kvm_mips_callbacks->handle_msa_disabled(vcpu); |
1373 | break; | |
1374 | ||
28c1e762 JH |
1375 | case EXCCODE_GE: |
1376 | /* defer exit accounting to handler */ | |
1377 | ret = kvm_mips_callbacks->handle_guest_exit(vcpu); | |
1378 | break; | |
1379 | ||
669e846e | 1380 | default: |
122e51d4 JH |
1381 | if (cause & CAUSEF_BD) |
1382 | opc += 1; | |
1383 | inst = 0; | |
6a97c775 | 1384 | kvm_get_badinstr(opc, vcpu, &inst); |
a27660f3 | 1385 | kvm_err("Exception Code: %d, not yet handled, @ PC: %p, inst: 0x%08x BadVaddr: %#lx Status: %#x\n", |
122e51d4 | 1386 | exccode, opc, inst, badvaddr, |
d116e812 | 1387 | kvm_read_c0_guest_status(vcpu->arch.cop0)); |
669e846e SL |
1388 | kvm_arch_vcpu_dump_regs(vcpu); |
1389 | run->exit_reason = KVM_EXIT_INTERNAL_ERROR; | |
1390 | ret = RESUME_HOST; | |
1391 | break; | |
1392 | ||
1393 | } | |
1394 | ||
1395 | skip_emul: | |
1396 | local_irq_disable(); | |
1397 | ||
f4474d50 JH |
1398 | if (ret == RESUME_GUEST) |
1399 | kvm_vz_acquire_htimer(vcpu); | |
1400 | ||
669e846e SL |
1401 | if (er == EMULATE_DONE && !(ret & RESUME_HOST)) |
1402 | kvm_mips_deliver_interrupts(vcpu, cause); | |
1403 | ||
1404 | if (!(ret & RESUME_HOST)) { | |
d116e812 | 1405 | /* Only check for signals if not already exiting to userspace */ |
669e846e SL |
1406 | if (signal_pending(current)) { |
1407 | run->exit_reason = KVM_EXIT_INTR; | |
1408 | ret = (-EINTR << 2) | RESUME_HOST; | |
1409 | ++vcpu->stat.signal_exits; | |
1e09e86a | 1410 | trace_kvm_exit(vcpu, KVM_TRACE_EXIT_SIGNAL); |
669e846e SL |
1411 | } |
1412 | } | |
1413 | ||
98e91b84 | 1414 | if (ret == RESUME_GUEST) { |
93258604 JH |
1415 | trace_kvm_reenter(vcpu); |
1416 | ||
4841e0dd JH |
1417 | /* |
1418 | * Make sure the read of VCPU requests in vcpu_reenter() | |
1419 | * callback is not reordered ahead of the write to vcpu->mode, | |
1420 | * or we could miss a TLB flush request while the requester sees | |
1421 | * the VCPU as outside of guest mode and not needing an IPI. | |
1422 | */ | |
1423 | smp_store_mb(vcpu->mode, IN_GUEST_MODE); | |
1424 | ||
a2c046e4 | 1425 | kvm_mips_callbacks->vcpu_reenter(run, vcpu); |
25b08c7f | 1426 | |
98e91b84 | 1427 | /* |
539cb89f JH |
1428 | * If FPU / MSA are enabled (i.e. the guest's FPU / MSA context |
1429 | * is live), restore FCR31 / MSACSR. | |
98e91b84 JH |
1430 | * |
1431 | * This should be before returning to the guest exception | |
539cb89f JH |
1432 | * vector, as it may well cause an [MSA] FP exception if there |
1433 | * are pending exception bits unmasked. (see | |
98e91b84 JH |
1434 | * kvm_mips_csr_die_notifier() for how that is handled). |
1435 | */ | |
1436 | if (kvm_mips_guest_has_fpu(&vcpu->arch) && | |
1437 | read_c0_status() & ST0_CU1) | |
1438 | __kvm_restore_fcsr(&vcpu->arch); | |
539cb89f JH |
1439 | |
1440 | if (kvm_mips_guest_has_msa(&vcpu->arch) && | |
1441 | read_c0_config5() & MIPS_CONF5_MSAEN) | |
1442 | __kvm_restore_msacsr(&vcpu->arch); | |
98e91b84 JH |
1443 | } |
1444 | ||
c4c6f2ca | 1445 | /* Disable HTW before returning to guest or host */ |
ea1bdbf6 JH |
1446 | if (!IS_ENABLED(CONFIG_KVM_MIPS_VZ)) |
1447 | htw_stop(); | |
c4c6f2ca | 1448 | |
669e846e SL |
1449 | return ret; |
1450 | } | |
1451 | ||
98e91b84 JH |
1452 | /* Enable FPU for guest and restore context */ |
1453 | void kvm_own_fpu(struct kvm_vcpu *vcpu) | |
1454 | { | |
1455 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
1456 | unsigned int sr, cfg5; | |
1457 | ||
1458 | preempt_disable(); | |
1459 | ||
539cb89f JH |
1460 | sr = kvm_read_c0_guest_status(cop0); |
1461 | ||
1462 | /* | |
1463 | * If MSA state is already live, it is undefined how it interacts with | |
1464 | * FR=0 FPU state, and we don't want to hit reserved instruction | |
1465 | * exceptions trying to save the MSA state later when CU=1 && FR=1, so | |
1466 | * play it safe and save it first. | |
1467 | * | |
1468 | * In theory we shouldn't ever hit this case since kvm_lose_fpu() should | |
1469 | * get called when guest CU1 is set, however we can't trust the guest | |
1470 | * not to clobber the status register directly via the commpage. | |
1471 | */ | |
1472 | if (cpu_has_msa && sr & ST0_CU1 && !(sr & ST0_FR) && | |
f943176a | 1473 | vcpu->arch.aux_inuse & KVM_MIPS_AUX_MSA) |
539cb89f JH |
1474 | kvm_lose_fpu(vcpu); |
1475 | ||
98e91b84 JH |
1476 | /* |
1477 | * Enable FPU for guest | |
1478 | * We set FR and FRE according to guest context | |
1479 | */ | |
98e91b84 JH |
1480 | change_c0_status(ST0_CU1 | ST0_FR, sr); |
1481 | if (cpu_has_fre) { | |
1482 | cfg5 = kvm_read_c0_guest_config5(cop0); | |
1483 | change_c0_config5(MIPS_CONF5_FRE, cfg5); | |
1484 | } | |
1485 | enable_fpu_hazard(); | |
1486 | ||
1487 | /* If guest FPU state not active, restore it now */ | |
f943176a | 1488 | if (!(vcpu->arch.aux_inuse & KVM_MIPS_AUX_FPU)) { |
98e91b84 | 1489 | __kvm_restore_fpu(&vcpu->arch); |
f943176a | 1490 | vcpu->arch.aux_inuse |= KVM_MIPS_AUX_FPU; |
04ebebf4 JH |
1491 | trace_kvm_aux(vcpu, KVM_TRACE_AUX_RESTORE, KVM_TRACE_AUX_FPU); |
1492 | } else { | |
1493 | trace_kvm_aux(vcpu, KVM_TRACE_AUX_ENABLE, KVM_TRACE_AUX_FPU); | |
98e91b84 JH |
1494 | } |
1495 | ||
1496 | preempt_enable(); | |
1497 | } | |
1498 | ||
539cb89f JH |
1499 | #ifdef CONFIG_CPU_HAS_MSA |
1500 | /* Enable MSA for guest and restore context */ | |
1501 | void kvm_own_msa(struct kvm_vcpu *vcpu) | |
1502 | { | |
1503 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
1504 | unsigned int sr, cfg5; | |
1505 | ||
1506 | preempt_disable(); | |
1507 | ||
1508 | /* | |
1509 | * Enable FPU if enabled in guest, since we're restoring FPU context | |
1510 | * anyway. We set FR and FRE according to guest context. | |
1511 | */ | |
1512 | if (kvm_mips_guest_has_fpu(&vcpu->arch)) { | |
1513 | sr = kvm_read_c0_guest_status(cop0); | |
1514 | ||
1515 | /* | |
1516 | * If FR=0 FPU state is already live, it is undefined how it | |
1517 | * interacts with MSA state, so play it safe and save it first. | |
1518 | */ | |
1519 | if (!(sr & ST0_FR) && | |
f943176a JH |
1520 | (vcpu->arch.aux_inuse & (KVM_MIPS_AUX_FPU | |
1521 | KVM_MIPS_AUX_MSA)) == KVM_MIPS_AUX_FPU) | |
539cb89f JH |
1522 | kvm_lose_fpu(vcpu); |
1523 | ||
1524 | change_c0_status(ST0_CU1 | ST0_FR, sr); | |
1525 | if (sr & ST0_CU1 && cpu_has_fre) { | |
1526 | cfg5 = kvm_read_c0_guest_config5(cop0); | |
1527 | change_c0_config5(MIPS_CONF5_FRE, cfg5); | |
1528 | } | |
1529 | } | |
1530 | ||
1531 | /* Enable MSA for guest */ | |
1532 | set_c0_config5(MIPS_CONF5_MSAEN); | |
1533 | enable_fpu_hazard(); | |
1534 | ||
f943176a JH |
1535 | switch (vcpu->arch.aux_inuse & (KVM_MIPS_AUX_FPU | KVM_MIPS_AUX_MSA)) { |
1536 | case KVM_MIPS_AUX_FPU: | |
539cb89f JH |
1537 | /* |
1538 | * Guest FPU state already loaded, only restore upper MSA state | |
1539 | */ | |
1540 | __kvm_restore_msa_upper(&vcpu->arch); | |
f943176a | 1541 | vcpu->arch.aux_inuse |= KVM_MIPS_AUX_MSA; |
04ebebf4 | 1542 | trace_kvm_aux(vcpu, KVM_TRACE_AUX_RESTORE, KVM_TRACE_AUX_MSA); |
539cb89f JH |
1543 | break; |
1544 | case 0: | |
1545 | /* Neither FPU or MSA already active, restore full MSA state */ | |
1546 | __kvm_restore_msa(&vcpu->arch); | |
f943176a | 1547 | vcpu->arch.aux_inuse |= KVM_MIPS_AUX_MSA; |
539cb89f | 1548 | if (kvm_mips_guest_has_fpu(&vcpu->arch)) |
f943176a | 1549 | vcpu->arch.aux_inuse |= KVM_MIPS_AUX_FPU; |
04ebebf4 JH |
1550 | trace_kvm_aux(vcpu, KVM_TRACE_AUX_RESTORE, |
1551 | KVM_TRACE_AUX_FPU_MSA); | |
539cb89f JH |
1552 | break; |
1553 | default: | |
04ebebf4 | 1554 | trace_kvm_aux(vcpu, KVM_TRACE_AUX_ENABLE, KVM_TRACE_AUX_MSA); |
539cb89f JH |
1555 | break; |
1556 | } | |
1557 | ||
1558 | preempt_enable(); | |
1559 | } | |
1560 | #endif | |
1561 | ||
1562 | /* Drop FPU & MSA without saving it */ | |
98e91b84 JH |
1563 | void kvm_drop_fpu(struct kvm_vcpu *vcpu) |
1564 | { | |
1565 | preempt_disable(); | |
f943176a | 1566 | if (cpu_has_msa && vcpu->arch.aux_inuse & KVM_MIPS_AUX_MSA) { |
539cb89f | 1567 | disable_msa(); |
04ebebf4 | 1568 | trace_kvm_aux(vcpu, KVM_TRACE_AUX_DISCARD, KVM_TRACE_AUX_MSA); |
f943176a | 1569 | vcpu->arch.aux_inuse &= ~KVM_MIPS_AUX_MSA; |
539cb89f | 1570 | } |
f943176a | 1571 | if (vcpu->arch.aux_inuse & KVM_MIPS_AUX_FPU) { |
98e91b84 | 1572 | clear_c0_status(ST0_CU1 | ST0_FR); |
04ebebf4 | 1573 | trace_kvm_aux(vcpu, KVM_TRACE_AUX_DISCARD, KVM_TRACE_AUX_FPU); |
f943176a | 1574 | vcpu->arch.aux_inuse &= ~KVM_MIPS_AUX_FPU; |
98e91b84 JH |
1575 | } |
1576 | preempt_enable(); | |
1577 | } | |
1578 | ||
539cb89f | 1579 | /* Save and disable FPU & MSA */ |
98e91b84 JH |
1580 | void kvm_lose_fpu(struct kvm_vcpu *vcpu) |
1581 | { | |
1582 | /* | |
c58cf741 JH |
1583 | * With T&E, FPU & MSA get disabled in root context (hardware) when it |
1584 | * is disabled in guest context (software), but the register state in | |
1585 | * the hardware may still be in use. | |
1586 | * This is why we explicitly re-enable the hardware before saving. | |
98e91b84 JH |
1587 | */ |
1588 | ||
1589 | preempt_disable(); | |
f943176a | 1590 | if (cpu_has_msa && vcpu->arch.aux_inuse & KVM_MIPS_AUX_MSA) { |
c58cf741 JH |
1591 | if (!IS_ENABLED(CONFIG_KVM_MIPS_VZ)) { |
1592 | set_c0_config5(MIPS_CONF5_MSAEN); | |
1593 | enable_fpu_hazard(); | |
1594 | } | |
539cb89f JH |
1595 | |
1596 | __kvm_save_msa(&vcpu->arch); | |
04ebebf4 | 1597 | trace_kvm_aux(vcpu, KVM_TRACE_AUX_SAVE, KVM_TRACE_AUX_FPU_MSA); |
539cb89f JH |
1598 | |
1599 | /* Disable MSA & FPU */ | |
1600 | disable_msa(); | |
f943176a | 1601 | if (vcpu->arch.aux_inuse & KVM_MIPS_AUX_FPU) { |
539cb89f | 1602 | clear_c0_status(ST0_CU1 | ST0_FR); |
4ac33429 JH |
1603 | disable_fpu_hazard(); |
1604 | } | |
f943176a JH |
1605 | vcpu->arch.aux_inuse &= ~(KVM_MIPS_AUX_FPU | KVM_MIPS_AUX_MSA); |
1606 | } else if (vcpu->arch.aux_inuse & KVM_MIPS_AUX_FPU) { | |
c58cf741 JH |
1607 | if (!IS_ENABLED(CONFIG_KVM_MIPS_VZ)) { |
1608 | set_c0_status(ST0_CU1); | |
1609 | enable_fpu_hazard(); | |
1610 | } | |
98e91b84 JH |
1611 | |
1612 | __kvm_save_fpu(&vcpu->arch); | |
f943176a | 1613 | vcpu->arch.aux_inuse &= ~KVM_MIPS_AUX_FPU; |
04ebebf4 | 1614 | trace_kvm_aux(vcpu, KVM_TRACE_AUX_SAVE, KVM_TRACE_AUX_FPU); |
98e91b84 JH |
1615 | |
1616 | /* Disable FPU */ | |
1617 | clear_c0_status(ST0_CU1 | ST0_FR); | |
4ac33429 | 1618 | disable_fpu_hazard(); |
98e91b84 JH |
1619 | } |
1620 | preempt_enable(); | |
1621 | } | |
1622 | ||
1623 | /* | |
539cb89f JH |
1624 | * Step over a specific ctc1 to FCSR and a specific ctcmsa to MSACSR which are |
1625 | * used to restore guest FCSR/MSACSR state and may trigger a "harmless" FP/MSAFP | |
1626 | * exception if cause bits are set in the value being written. | |
98e91b84 JH |
1627 | */ |
1628 | static int kvm_mips_csr_die_notify(struct notifier_block *self, | |
1629 | unsigned long cmd, void *ptr) | |
1630 | { | |
1631 | struct die_args *args = (struct die_args *)ptr; | |
1632 | struct pt_regs *regs = args->regs; | |
1633 | unsigned long pc; | |
1634 | ||
539cb89f JH |
1635 | /* Only interested in FPE and MSAFPE */ |
1636 | if (cmd != DIE_FP && cmd != DIE_MSAFP) | |
98e91b84 JH |
1637 | return NOTIFY_DONE; |
1638 | ||
1639 | /* Return immediately if guest context isn't active */ | |
1640 | if (!(current->flags & PF_VCPU)) | |
1641 | return NOTIFY_DONE; | |
1642 | ||
1643 | /* Should never get here from user mode */ | |
1644 | BUG_ON(user_mode(regs)); | |
1645 | ||
1646 | pc = instruction_pointer(regs); | |
1647 | switch (cmd) { | |
1648 | case DIE_FP: | |
1649 | /* match 2nd instruction in __kvm_restore_fcsr */ | |
1650 | if (pc != (unsigned long)&__kvm_restore_fcsr + 4) | |
1651 | return NOTIFY_DONE; | |
1652 | break; | |
539cb89f JH |
1653 | case DIE_MSAFP: |
1654 | /* match 2nd/3rd instruction in __kvm_restore_msacsr */ | |
1655 | if (!cpu_has_msa || | |
1656 | pc < (unsigned long)&__kvm_restore_msacsr + 4 || | |
1657 | pc > (unsigned long)&__kvm_restore_msacsr + 8) | |
1658 | return NOTIFY_DONE; | |
1659 | break; | |
98e91b84 JH |
1660 | } |
1661 | ||
1662 | /* Move PC forward a little and continue executing */ | |
1663 | instruction_pointer(regs) += 4; | |
1664 | ||
1665 | return NOTIFY_STOP; | |
1666 | } | |
1667 | ||
1668 | static struct notifier_block kvm_mips_csr_die_notifier = { | |
1669 | .notifier_call = kvm_mips_csr_die_notify, | |
1670 | }; | |
1671 | ||
2db9d233 | 1672 | static int __init kvm_mips_init(void) |
669e846e SL |
1673 | { |
1674 | int ret; | |
1675 | ||
1e5217f5 JH |
1676 | ret = kvm_mips_entry_setup(); |
1677 | if (ret) | |
1678 | return ret; | |
1679 | ||
669e846e SL |
1680 | ret = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE); |
1681 | ||
1682 | if (ret) | |
1683 | return ret; | |
1684 | ||
98e91b84 JH |
1685 | register_die_notifier(&kvm_mips_csr_die_notifier); |
1686 | ||
669e846e SL |
1687 | return 0; |
1688 | } | |
1689 | ||
2db9d233 | 1690 | static void __exit kvm_mips_exit(void) |
669e846e SL |
1691 | { |
1692 | kvm_exit(); | |
1693 | ||
98e91b84 | 1694 | unregister_die_notifier(&kvm_mips_csr_die_notifier); |
669e846e SL |
1695 | } |
1696 | ||
1697 | module_init(kvm_mips_init); | |
1698 | module_exit(kvm_mips_exit); | |
1699 | ||
1700 | EXPORT_TRACEPOINT_SYMBOL(kvm_exit); |