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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 SL |
448 | sigset_t sigsaved; |
449 | ||
450 | if (vcpu->sigset_active) | |
451 | sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); | |
452 | ||
453 | if (vcpu->mmio_needed) { | |
454 | if (!vcpu->mmio_is_write) | |
455 | kvm_mips_complete_mmio_load(vcpu, run); | |
456 | vcpu->mmio_needed = 0; | |
457 | } | |
458 | ||
460df4c1 PB |
459 | if (run->immediate_exit) |
460 | goto out; | |
461 | ||
f798217d JH |
462 | lose_fpu(1); |
463 | ||
044f0f03 | 464 | local_irq_disable(); |
6edaa530 | 465 | guest_enter_irqoff(); |
93258604 | 466 | trace_kvm_enter(vcpu); |
25b08c7f | 467 | |
4841e0dd JH |
468 | /* |
469 | * Make sure the read of VCPU requests in vcpu_run() callback is not | |
470 | * reordered ahead of the write to vcpu->mode, or we could miss a TLB | |
471 | * flush request while the requester sees the VCPU as outside of guest | |
472 | * mode and not needing an IPI. | |
473 | */ | |
474 | smp_store_mb(vcpu->mode, IN_GUEST_MODE); | |
475 | ||
a2c046e4 | 476 | r = kvm_mips_callbacks->vcpu_run(run, vcpu); |
25b08c7f | 477 | |
93258604 | 478 | trace_kvm_out(vcpu); |
6edaa530 | 479 | guest_exit_irqoff(); |
669e846e SL |
480 | local_irq_enable(); |
481 | ||
460df4c1 | 482 | out: |
669e846e SL |
483 | if (vcpu->sigset_active) |
484 | sigprocmask(SIG_SETMASK, &sigsaved, NULL); | |
485 | ||
486 | return r; | |
487 | } | |
488 | ||
d116e812 DZ |
489 | int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, |
490 | struct kvm_mips_interrupt *irq) | |
669e846e SL |
491 | { |
492 | int intr = (int)irq->irq; | |
493 | struct kvm_vcpu *dvcpu = NULL; | |
494 | ||
495 | if (intr == 3 || intr == -3 || intr == 4 || intr == -4) | |
496 | kvm_debug("%s: CPU: %d, INTR: %d\n", __func__, irq->cpu, | |
497 | (int)intr); | |
498 | ||
499 | if (irq->cpu == -1) | |
500 | dvcpu = vcpu; | |
501 | else | |
502 | dvcpu = vcpu->kvm->vcpus[irq->cpu]; | |
503 | ||
504 | if (intr == 2 || intr == 3 || intr == 4) { | |
505 | kvm_mips_callbacks->queue_io_int(dvcpu, irq); | |
506 | ||
507 | } else if (intr == -2 || intr == -3 || intr == -4) { | |
508 | kvm_mips_callbacks->dequeue_io_int(dvcpu, irq); | |
509 | } else { | |
510 | kvm_err("%s: invalid interrupt ioctl (%d:%d)\n", __func__, | |
511 | irq->cpu, irq->irq); | |
512 | return -EINVAL; | |
513 | } | |
514 | ||
515 | dvcpu->arch.wait = 0; | |
516 | ||
4c0b4bc6 | 517 | if (swq_has_sleeper(&dvcpu->wq)) |
8577370f | 518 | swake_up(&dvcpu->wq); |
669e846e SL |
519 | |
520 | return 0; | |
521 | } | |
522 | ||
d116e812 DZ |
523 | int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, |
524 | struct kvm_mp_state *mp_state) | |
669e846e | 525 | { |
ed829857 | 526 | return -ENOIOCTLCMD; |
669e846e SL |
527 | } |
528 | ||
d116e812 DZ |
529 | int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, |
530 | struct kvm_mp_state *mp_state) | |
669e846e | 531 | { |
ed829857 | 532 | return -ENOIOCTLCMD; |
669e846e SL |
533 | } |
534 | ||
4c73fb2b DD |
535 | static u64 kvm_mips_get_one_regs[] = { |
536 | KVM_REG_MIPS_R0, | |
537 | KVM_REG_MIPS_R1, | |
538 | KVM_REG_MIPS_R2, | |
539 | KVM_REG_MIPS_R3, | |
540 | KVM_REG_MIPS_R4, | |
541 | KVM_REG_MIPS_R5, | |
542 | KVM_REG_MIPS_R6, | |
543 | KVM_REG_MIPS_R7, | |
544 | KVM_REG_MIPS_R8, | |
545 | KVM_REG_MIPS_R9, | |
546 | KVM_REG_MIPS_R10, | |
547 | KVM_REG_MIPS_R11, | |
548 | KVM_REG_MIPS_R12, | |
549 | KVM_REG_MIPS_R13, | |
550 | KVM_REG_MIPS_R14, | |
551 | KVM_REG_MIPS_R15, | |
552 | KVM_REG_MIPS_R16, | |
553 | KVM_REG_MIPS_R17, | |
554 | KVM_REG_MIPS_R18, | |
555 | KVM_REG_MIPS_R19, | |
556 | KVM_REG_MIPS_R20, | |
557 | KVM_REG_MIPS_R21, | |
558 | KVM_REG_MIPS_R22, | |
559 | KVM_REG_MIPS_R23, | |
560 | KVM_REG_MIPS_R24, | |
561 | KVM_REG_MIPS_R25, | |
562 | KVM_REG_MIPS_R26, | |
563 | KVM_REG_MIPS_R27, | |
564 | KVM_REG_MIPS_R28, | |
565 | KVM_REG_MIPS_R29, | |
566 | KVM_REG_MIPS_R30, | |
567 | KVM_REG_MIPS_R31, | |
568 | ||
70e92c7e | 569 | #ifndef CONFIG_CPU_MIPSR6 |
4c73fb2b DD |
570 | KVM_REG_MIPS_HI, |
571 | KVM_REG_MIPS_LO, | |
70e92c7e | 572 | #endif |
4c73fb2b | 573 | KVM_REG_MIPS_PC, |
4c73fb2b DD |
574 | }; |
575 | ||
e5775930 JH |
576 | static u64 kvm_mips_get_one_regs_fpu[] = { |
577 | KVM_REG_MIPS_FCR_IR, | |
578 | KVM_REG_MIPS_FCR_CSR, | |
579 | }; | |
580 | ||
581 | static u64 kvm_mips_get_one_regs_msa[] = { | |
582 | KVM_REG_MIPS_MSA_IR, | |
583 | KVM_REG_MIPS_MSA_CSR, | |
584 | }; | |
585 | ||
f5c43bd4 JH |
586 | static unsigned long kvm_mips_num_regs(struct kvm_vcpu *vcpu) |
587 | { | |
588 | unsigned long ret; | |
589 | ||
590 | ret = ARRAY_SIZE(kvm_mips_get_one_regs); | |
e5775930 JH |
591 | if (kvm_mips_guest_can_have_fpu(&vcpu->arch)) { |
592 | ret += ARRAY_SIZE(kvm_mips_get_one_regs_fpu) + 48; | |
593 | /* odd doubles */ | |
594 | if (boot_cpu_data.fpu_id & MIPS_FPIR_F64) | |
595 | ret += 16; | |
596 | } | |
597 | if (kvm_mips_guest_can_have_msa(&vcpu->arch)) | |
598 | ret += ARRAY_SIZE(kvm_mips_get_one_regs_msa) + 32; | |
f5c43bd4 JH |
599 | ret += kvm_mips_callbacks->num_regs(vcpu); |
600 | ||
601 | return ret; | |
602 | } | |
603 | ||
604 | static int kvm_mips_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices) | |
605 | { | |
e5775930 JH |
606 | u64 index; |
607 | unsigned int i; | |
608 | ||
f5c43bd4 JH |
609 | if (copy_to_user(indices, kvm_mips_get_one_regs, |
610 | sizeof(kvm_mips_get_one_regs))) | |
611 | return -EFAULT; | |
612 | indices += ARRAY_SIZE(kvm_mips_get_one_regs); | |
613 | ||
e5775930 JH |
614 | if (kvm_mips_guest_can_have_fpu(&vcpu->arch)) { |
615 | if (copy_to_user(indices, kvm_mips_get_one_regs_fpu, | |
616 | sizeof(kvm_mips_get_one_regs_fpu))) | |
617 | return -EFAULT; | |
618 | indices += ARRAY_SIZE(kvm_mips_get_one_regs_fpu); | |
619 | ||
620 | for (i = 0; i < 32; ++i) { | |
621 | index = KVM_REG_MIPS_FPR_32(i); | |
622 | if (copy_to_user(indices, &index, sizeof(index))) | |
623 | return -EFAULT; | |
624 | ++indices; | |
625 | ||
626 | /* skip odd doubles if no F64 */ | |
627 | if (i & 1 && !(boot_cpu_data.fpu_id & MIPS_FPIR_F64)) | |
628 | continue; | |
629 | ||
630 | index = KVM_REG_MIPS_FPR_64(i); | |
631 | if (copy_to_user(indices, &index, sizeof(index))) | |
632 | return -EFAULT; | |
633 | ++indices; | |
634 | } | |
635 | } | |
636 | ||
637 | if (kvm_mips_guest_can_have_msa(&vcpu->arch)) { | |
638 | if (copy_to_user(indices, kvm_mips_get_one_regs_msa, | |
639 | sizeof(kvm_mips_get_one_regs_msa))) | |
640 | return -EFAULT; | |
641 | indices += ARRAY_SIZE(kvm_mips_get_one_regs_msa); | |
642 | ||
643 | for (i = 0; i < 32; ++i) { | |
644 | index = KVM_REG_MIPS_VEC_128(i); | |
645 | if (copy_to_user(indices, &index, sizeof(index))) | |
646 | return -EFAULT; | |
647 | ++indices; | |
648 | } | |
649 | } | |
650 | ||
f5c43bd4 JH |
651 | return kvm_mips_callbacks->copy_reg_indices(vcpu, indices); |
652 | } | |
653 | ||
4c73fb2b DD |
654 | static int kvm_mips_get_reg(struct kvm_vcpu *vcpu, |
655 | const struct kvm_one_reg *reg) | |
656 | { | |
4c73fb2b | 657 | struct mips_coproc *cop0 = vcpu->arch.cop0; |
379245cd | 658 | struct mips_fpu_struct *fpu = &vcpu->arch.fpu; |
f8be02da | 659 | int ret; |
4c73fb2b | 660 | s64 v; |
ab86bd60 | 661 | s64 vs[2]; |
379245cd | 662 | unsigned int idx; |
4c73fb2b DD |
663 | |
664 | switch (reg->id) { | |
379245cd | 665 | /* General purpose registers */ |
4c73fb2b DD |
666 | case KVM_REG_MIPS_R0 ... KVM_REG_MIPS_R31: |
667 | v = (long)vcpu->arch.gprs[reg->id - KVM_REG_MIPS_R0]; | |
668 | break; | |
70e92c7e | 669 | #ifndef CONFIG_CPU_MIPSR6 |
4c73fb2b DD |
670 | case KVM_REG_MIPS_HI: |
671 | v = (long)vcpu->arch.hi; | |
672 | break; | |
673 | case KVM_REG_MIPS_LO: | |
674 | v = (long)vcpu->arch.lo; | |
675 | break; | |
70e92c7e | 676 | #endif |
4c73fb2b DD |
677 | case KVM_REG_MIPS_PC: |
678 | v = (long)vcpu->arch.pc; | |
679 | break; | |
680 | ||
379245cd JH |
681 | /* Floating point registers */ |
682 | case KVM_REG_MIPS_FPR_32(0) ... KVM_REG_MIPS_FPR_32(31): | |
683 | if (!kvm_mips_guest_has_fpu(&vcpu->arch)) | |
684 | return -EINVAL; | |
685 | idx = reg->id - KVM_REG_MIPS_FPR_32(0); | |
686 | /* Odd singles in top of even double when FR=0 */ | |
687 | if (kvm_read_c0_guest_status(cop0) & ST0_FR) | |
688 | v = get_fpr32(&fpu->fpr[idx], 0); | |
689 | else | |
690 | v = get_fpr32(&fpu->fpr[idx & ~1], idx & 1); | |
691 | break; | |
692 | case KVM_REG_MIPS_FPR_64(0) ... KVM_REG_MIPS_FPR_64(31): | |
693 | if (!kvm_mips_guest_has_fpu(&vcpu->arch)) | |
694 | return -EINVAL; | |
695 | idx = reg->id - KVM_REG_MIPS_FPR_64(0); | |
696 | /* Can't access odd doubles in FR=0 mode */ | |
697 | if (idx & 1 && !(kvm_read_c0_guest_status(cop0) & ST0_FR)) | |
698 | return -EINVAL; | |
699 | v = get_fpr64(&fpu->fpr[idx], 0); | |
700 | break; | |
701 | case KVM_REG_MIPS_FCR_IR: | |
702 | if (!kvm_mips_guest_has_fpu(&vcpu->arch)) | |
703 | return -EINVAL; | |
704 | v = boot_cpu_data.fpu_id; | |
705 | break; | |
706 | case KVM_REG_MIPS_FCR_CSR: | |
707 | if (!kvm_mips_guest_has_fpu(&vcpu->arch)) | |
708 | return -EINVAL; | |
709 | v = fpu->fcr31; | |
710 | break; | |
711 | ||
ab86bd60 JH |
712 | /* MIPS SIMD Architecture (MSA) registers */ |
713 | case KVM_REG_MIPS_VEC_128(0) ... KVM_REG_MIPS_VEC_128(31): | |
714 | if (!kvm_mips_guest_has_msa(&vcpu->arch)) | |
715 | return -EINVAL; | |
716 | /* Can't access MSA registers in FR=0 mode */ | |
717 | if (!(kvm_read_c0_guest_status(cop0) & ST0_FR)) | |
718 | return -EINVAL; | |
719 | idx = reg->id - KVM_REG_MIPS_VEC_128(0); | |
720 | #ifdef CONFIG_CPU_LITTLE_ENDIAN | |
721 | /* least significant byte first */ | |
722 | vs[0] = get_fpr64(&fpu->fpr[idx], 0); | |
723 | vs[1] = get_fpr64(&fpu->fpr[idx], 1); | |
724 | #else | |
725 | /* most significant byte first */ | |
726 | vs[0] = get_fpr64(&fpu->fpr[idx], 1); | |
727 | vs[1] = get_fpr64(&fpu->fpr[idx], 0); | |
728 | #endif | |
729 | break; | |
730 | case KVM_REG_MIPS_MSA_IR: | |
731 | if (!kvm_mips_guest_has_msa(&vcpu->arch)) | |
732 | return -EINVAL; | |
733 | v = boot_cpu_data.msa_id; | |
734 | break; | |
735 | case KVM_REG_MIPS_MSA_CSR: | |
736 | if (!kvm_mips_guest_has_msa(&vcpu->arch)) | |
737 | return -EINVAL; | |
738 | v = fpu->msacsr; | |
739 | break; | |
740 | ||
f8be02da | 741 | /* registers to be handled specially */ |
cc68d22f | 742 | default: |
f8be02da JH |
743 | ret = kvm_mips_callbacks->get_one_reg(vcpu, reg, &v); |
744 | if (ret) | |
745 | return ret; | |
746 | break; | |
4c73fb2b | 747 | } |
681865d4 DD |
748 | if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) { |
749 | u64 __user *uaddr64 = (u64 __user *)(long)reg->addr; | |
d116e812 | 750 | |
681865d4 DD |
751 | return put_user(v, uaddr64); |
752 | } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) { | |
753 | u32 __user *uaddr32 = (u32 __user *)(long)reg->addr; | |
754 | u32 v32 = (u32)v; | |
d116e812 | 755 | |
681865d4 | 756 | return put_user(v32, uaddr32); |
ab86bd60 JH |
757 | } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U128) { |
758 | void __user *uaddr = (void __user *)(long)reg->addr; | |
759 | ||
0178fd7d | 760 | return copy_to_user(uaddr, vs, 16) ? -EFAULT : 0; |
681865d4 DD |
761 | } else { |
762 | return -EINVAL; | |
763 | } | |
4c73fb2b DD |
764 | } |
765 | ||
766 | static int kvm_mips_set_reg(struct kvm_vcpu *vcpu, | |
767 | const struct kvm_one_reg *reg) | |
768 | { | |
4c73fb2b | 769 | struct mips_coproc *cop0 = vcpu->arch.cop0; |
379245cd JH |
770 | struct mips_fpu_struct *fpu = &vcpu->arch.fpu; |
771 | s64 v; | |
ab86bd60 | 772 | s64 vs[2]; |
379245cd | 773 | unsigned int idx; |
4c73fb2b | 774 | |
681865d4 DD |
775 | if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) { |
776 | u64 __user *uaddr64 = (u64 __user *)(long)reg->addr; | |
777 | ||
778 | if (get_user(v, uaddr64) != 0) | |
779 | return -EFAULT; | |
780 | } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) { | |
781 | u32 __user *uaddr32 = (u32 __user *)(long)reg->addr; | |
782 | s32 v32; | |
783 | ||
784 | if (get_user(v32, uaddr32) != 0) | |
785 | return -EFAULT; | |
786 | v = (s64)v32; | |
ab86bd60 JH |
787 | } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U128) { |
788 | void __user *uaddr = (void __user *)(long)reg->addr; | |
789 | ||
0178fd7d | 790 | return copy_from_user(vs, uaddr, 16) ? -EFAULT : 0; |
681865d4 DD |
791 | } else { |
792 | return -EINVAL; | |
793 | } | |
4c73fb2b DD |
794 | |
795 | switch (reg->id) { | |
379245cd | 796 | /* General purpose registers */ |
4c73fb2b DD |
797 | case KVM_REG_MIPS_R0: |
798 | /* Silently ignore requests to set $0 */ | |
799 | break; | |
800 | case KVM_REG_MIPS_R1 ... KVM_REG_MIPS_R31: | |
801 | vcpu->arch.gprs[reg->id - KVM_REG_MIPS_R0] = v; | |
802 | break; | |
70e92c7e | 803 | #ifndef CONFIG_CPU_MIPSR6 |
4c73fb2b DD |
804 | case KVM_REG_MIPS_HI: |
805 | vcpu->arch.hi = v; | |
806 | break; | |
807 | case KVM_REG_MIPS_LO: | |
808 | vcpu->arch.lo = v; | |
809 | break; | |
70e92c7e | 810 | #endif |
4c73fb2b DD |
811 | case KVM_REG_MIPS_PC: |
812 | vcpu->arch.pc = v; | |
813 | break; | |
814 | ||
379245cd JH |
815 | /* Floating point registers */ |
816 | case KVM_REG_MIPS_FPR_32(0) ... KVM_REG_MIPS_FPR_32(31): | |
817 | if (!kvm_mips_guest_has_fpu(&vcpu->arch)) | |
818 | return -EINVAL; | |
819 | idx = reg->id - KVM_REG_MIPS_FPR_32(0); | |
820 | /* Odd singles in top of even double when FR=0 */ | |
821 | if (kvm_read_c0_guest_status(cop0) & ST0_FR) | |
822 | set_fpr32(&fpu->fpr[idx], 0, v); | |
823 | else | |
824 | set_fpr32(&fpu->fpr[idx & ~1], idx & 1, v); | |
825 | break; | |
826 | case KVM_REG_MIPS_FPR_64(0) ... KVM_REG_MIPS_FPR_64(31): | |
827 | if (!kvm_mips_guest_has_fpu(&vcpu->arch)) | |
828 | return -EINVAL; | |
829 | idx = reg->id - KVM_REG_MIPS_FPR_64(0); | |
830 | /* Can't access odd doubles in FR=0 mode */ | |
831 | if (idx & 1 && !(kvm_read_c0_guest_status(cop0) & ST0_FR)) | |
832 | return -EINVAL; | |
833 | set_fpr64(&fpu->fpr[idx], 0, v); | |
834 | break; | |
835 | case KVM_REG_MIPS_FCR_IR: | |
836 | if (!kvm_mips_guest_has_fpu(&vcpu->arch)) | |
837 | return -EINVAL; | |
838 | /* Read-only */ | |
839 | break; | |
840 | case KVM_REG_MIPS_FCR_CSR: | |
841 | if (!kvm_mips_guest_has_fpu(&vcpu->arch)) | |
842 | return -EINVAL; | |
843 | fpu->fcr31 = v; | |
844 | break; | |
845 | ||
ab86bd60 JH |
846 | /* MIPS SIMD Architecture (MSA) registers */ |
847 | case KVM_REG_MIPS_VEC_128(0) ... KVM_REG_MIPS_VEC_128(31): | |
848 | if (!kvm_mips_guest_has_msa(&vcpu->arch)) | |
849 | return -EINVAL; | |
850 | idx = reg->id - KVM_REG_MIPS_VEC_128(0); | |
851 | #ifdef CONFIG_CPU_LITTLE_ENDIAN | |
852 | /* least significant byte first */ | |
853 | set_fpr64(&fpu->fpr[idx], 0, vs[0]); | |
854 | set_fpr64(&fpu->fpr[idx], 1, vs[1]); | |
855 | #else | |
856 | /* most significant byte first */ | |
857 | set_fpr64(&fpu->fpr[idx], 1, vs[0]); | |
858 | set_fpr64(&fpu->fpr[idx], 0, vs[1]); | |
859 | #endif | |
860 | break; | |
861 | case KVM_REG_MIPS_MSA_IR: | |
862 | if (!kvm_mips_guest_has_msa(&vcpu->arch)) | |
863 | return -EINVAL; | |
864 | /* Read-only */ | |
865 | break; | |
866 | case KVM_REG_MIPS_MSA_CSR: | |
867 | if (!kvm_mips_guest_has_msa(&vcpu->arch)) | |
868 | return -EINVAL; | |
869 | fpu->msacsr = v; | |
870 | break; | |
871 | ||
f8be02da | 872 | /* registers to be handled specially */ |
4c73fb2b | 873 | default: |
cc68d22f | 874 | return kvm_mips_callbacks->set_one_reg(vcpu, reg, v); |
4c73fb2b DD |
875 | } |
876 | return 0; | |
877 | } | |
878 | ||
5fafd874 JH |
879 | static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu, |
880 | struct kvm_enable_cap *cap) | |
881 | { | |
882 | int r = 0; | |
883 | ||
884 | if (!kvm_vm_ioctl_check_extension(vcpu->kvm, cap->cap)) | |
885 | return -EINVAL; | |
886 | if (cap->flags) | |
887 | return -EINVAL; | |
888 | if (cap->args[0]) | |
889 | return -EINVAL; | |
890 | ||
891 | switch (cap->cap) { | |
892 | case KVM_CAP_MIPS_FPU: | |
893 | vcpu->arch.fpu_enabled = true; | |
894 | break; | |
d952bd07 JH |
895 | case KVM_CAP_MIPS_MSA: |
896 | vcpu->arch.msa_enabled = true; | |
897 | break; | |
5fafd874 JH |
898 | default: |
899 | r = -EINVAL; | |
900 | break; | |
901 | } | |
902 | ||
903 | return r; | |
904 | } | |
905 | ||
d116e812 DZ |
906 | long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl, |
907 | unsigned long arg) | |
669e846e SL |
908 | { |
909 | struct kvm_vcpu *vcpu = filp->private_data; | |
910 | void __user *argp = (void __user *)arg; | |
911 | long r; | |
669e846e SL |
912 | |
913 | switch (ioctl) { | |
4c73fb2b DD |
914 | case KVM_SET_ONE_REG: |
915 | case KVM_GET_ONE_REG: { | |
916 | struct kvm_one_reg reg; | |
d116e812 | 917 | |
4c73fb2b DD |
918 | if (copy_from_user(®, argp, sizeof(reg))) |
919 | return -EFAULT; | |
920 | if (ioctl == KVM_SET_ONE_REG) | |
921 | return kvm_mips_set_reg(vcpu, ®); | |
922 | else | |
923 | return kvm_mips_get_reg(vcpu, ®); | |
924 | } | |
925 | case KVM_GET_REG_LIST: { | |
926 | struct kvm_reg_list __user *user_list = argp; | |
4c73fb2b DD |
927 | struct kvm_reg_list reg_list; |
928 | unsigned n; | |
929 | ||
930 | if (copy_from_user(®_list, user_list, sizeof(reg_list))) | |
931 | return -EFAULT; | |
932 | n = reg_list.n; | |
f5c43bd4 | 933 | reg_list.n = kvm_mips_num_regs(vcpu); |
4c73fb2b DD |
934 | if (copy_to_user(user_list, ®_list, sizeof(reg_list))) |
935 | return -EFAULT; | |
936 | if (n < reg_list.n) | |
937 | return -E2BIG; | |
f5c43bd4 | 938 | return kvm_mips_copy_reg_indices(vcpu, user_list->reg); |
4c73fb2b | 939 | } |
669e846e SL |
940 | case KVM_INTERRUPT: |
941 | { | |
942 | struct kvm_mips_interrupt irq; | |
d116e812 | 943 | |
669e846e | 944 | if (copy_from_user(&irq, argp, sizeof(irq))) |
5a6da5f7 | 945 | return -EFAULT; |
669e846e SL |
946 | kvm_debug("[%d] %s: irq: %d\n", vcpu->vcpu_id, __func__, |
947 | irq.irq); | |
948 | ||
949 | r = kvm_vcpu_ioctl_interrupt(vcpu, &irq); | |
950 | break; | |
951 | } | |
5fafd874 JH |
952 | case KVM_ENABLE_CAP: { |
953 | struct kvm_enable_cap cap; | |
954 | ||
5fafd874 | 955 | if (copy_from_user(&cap, argp, sizeof(cap))) |
5a6da5f7 | 956 | return -EFAULT; |
5fafd874 JH |
957 | r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap); |
958 | break; | |
959 | } | |
669e846e | 960 | default: |
4c73fb2b | 961 | r = -ENOIOCTLCMD; |
669e846e | 962 | } |
669e846e SL |
963 | return r; |
964 | } | |
965 | ||
e88643ba JH |
966 | /** |
967 | * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot | |
968 | * @kvm: kvm instance | |
969 | * @log: slot id and address to which we copy the log | |
970 | * | |
971 | * Steps 1-4 below provide general overview of dirty page logging. See | |
972 | * kvm_get_dirty_log_protect() function description for additional details. | |
973 | * | |
974 | * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we | |
975 | * always flush the TLB (step 4) even if previous step failed and the dirty | |
976 | * bitmap may be corrupt. Regardless of previous outcome the KVM logging API | |
977 | * does not preclude user space subsequent dirty log read. Flushing TLB ensures | |
978 | * writes will be marked dirty for next log read. | |
979 | * | |
980 | * 1. Take a snapshot of the bit and clear it if needed. | |
981 | * 2. Write protect the corresponding page. | |
982 | * 3. Copy the snapshot to the userspace. | |
983 | * 4. Flush TLB's if needed. | |
984 | */ | |
669e846e SL |
985 | int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) |
986 | { | |
9f6b8029 | 987 | struct kvm_memslots *slots; |
669e846e | 988 | struct kvm_memory_slot *memslot; |
e88643ba | 989 | bool is_dirty = false; |
669e846e | 990 | int r; |
669e846e SL |
991 | |
992 | mutex_lock(&kvm->slots_lock); | |
993 | ||
e88643ba | 994 | r = kvm_get_dirty_log_protect(kvm, log, &is_dirty); |
669e846e | 995 | |
669e846e | 996 | if (is_dirty) { |
9f6b8029 PB |
997 | slots = kvm_memslots(kvm); |
998 | memslot = id_to_memslot(slots, log->slot); | |
669e846e | 999 | |
e88643ba JH |
1000 | /* Let implementation handle TLB/GVA invalidation */ |
1001 | kvm_mips_callbacks->flush_shadow_memslot(kvm, memslot); | |
669e846e SL |
1002 | } |
1003 | ||
669e846e SL |
1004 | mutex_unlock(&kvm->slots_lock); |
1005 | return r; | |
669e846e SL |
1006 | } |
1007 | ||
1008 | long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) | |
1009 | { | |
1010 | long r; | |
1011 | ||
1012 | switch (ioctl) { | |
1013 | default: | |
ed829857 | 1014 | r = -ENOIOCTLCMD; |
669e846e SL |
1015 | } |
1016 | ||
1017 | return r; | |
1018 | } | |
1019 | ||
1020 | int kvm_arch_init(void *opaque) | |
1021 | { | |
669e846e SL |
1022 | if (kvm_mips_callbacks) { |
1023 | kvm_err("kvm: module already exists\n"); | |
1024 | return -EEXIST; | |
1025 | } | |
1026 | ||
d98403a5 | 1027 | return kvm_mips_emulation_init(&kvm_mips_callbacks); |
669e846e SL |
1028 | } |
1029 | ||
1030 | void kvm_arch_exit(void) | |
1031 | { | |
1032 | kvm_mips_callbacks = NULL; | |
1033 | } | |
1034 | ||
d116e812 DZ |
1035 | int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, |
1036 | struct kvm_sregs *sregs) | |
669e846e | 1037 | { |
ed829857 | 1038 | return -ENOIOCTLCMD; |
669e846e SL |
1039 | } |
1040 | ||
d116e812 DZ |
1041 | int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, |
1042 | struct kvm_sregs *sregs) | |
669e846e | 1043 | { |
ed829857 | 1044 | return -ENOIOCTLCMD; |
669e846e SL |
1045 | } |
1046 | ||
31928aa5 | 1047 | void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) |
669e846e | 1048 | { |
669e846e SL |
1049 | } |
1050 | ||
1051 | int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) | |
1052 | { | |
ed829857 | 1053 | return -ENOIOCTLCMD; |
669e846e SL |
1054 | } |
1055 | ||
1056 | int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) | |
1057 | { | |
ed829857 | 1058 | return -ENOIOCTLCMD; |
669e846e SL |
1059 | } |
1060 | ||
1061 | int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) | |
1062 | { | |
1063 | return VM_FAULT_SIGBUS; | |
1064 | } | |
1065 | ||
784aa3d7 | 1066 | int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) |
669e846e SL |
1067 | { |
1068 | int r; | |
1069 | ||
1070 | switch (ext) { | |
4c73fb2b | 1071 | case KVM_CAP_ONE_REG: |
5fafd874 | 1072 | case KVM_CAP_ENABLE_CAP: |
230c5724 | 1073 | case KVM_CAP_READONLY_MEM: |
411740f5 | 1074 | case KVM_CAP_SYNC_MMU: |
460df4c1 | 1075 | case KVM_CAP_IMMEDIATE_EXIT: |
4c73fb2b DD |
1076 | r = 1; |
1077 | break; | |
12ed1fae JH |
1078 | case KVM_CAP_NR_VCPUS: |
1079 | r = num_online_cpus(); | |
1080 | break; | |
1081 | case KVM_CAP_MAX_VCPUS: | |
1082 | r = KVM_MAX_VCPUS; | |
1083 | break; | |
5fafd874 | 1084 | case KVM_CAP_MIPS_FPU: |
556f2a52 JH |
1085 | /* We don't handle systems with inconsistent cpu_has_fpu */ |
1086 | r = !!raw_cpu_has_fpu; | |
5fafd874 | 1087 | break; |
d952bd07 JH |
1088 | case KVM_CAP_MIPS_MSA: |
1089 | /* | |
1090 | * We don't support MSA vector partitioning yet: | |
1091 | * 1) It would require explicit support which can't be tested | |
1092 | * yet due to lack of support in current hardware. | |
1093 | * 2) It extends the state that would need to be saved/restored | |
1094 | * by e.g. QEMU for migration. | |
1095 | * | |
1096 | * When vector partitioning hardware becomes available, support | |
1097 | * could be added by requiring a flag when enabling | |
1098 | * KVM_CAP_MIPS_MSA capability to indicate that userland knows | |
1099 | * to save/restore the appropriate extra state. | |
1100 | */ | |
1101 | r = cpu_has_msa && !(boot_cpu_data.msa_id & MSA_IR_WRPF); | |
1102 | break; | |
669e846e | 1103 | default: |
607ef2fd | 1104 | r = kvm_mips_callbacks->check_extension(kvm, ext); |
669e846e SL |
1105 | break; |
1106 | } | |
1107 | return r; | |
669e846e SL |
1108 | } |
1109 | ||
1110 | int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) | |
1111 | { | |
f4474d50 JH |
1112 | return kvm_mips_pending_timer(vcpu) || |
1113 | kvm_read_c0_guest_cause(vcpu->arch.cop0) & C_TI; | |
669e846e SL |
1114 | } |
1115 | ||
1116 | int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu) | |
1117 | { | |
1118 | int i; | |
1119 | struct mips_coproc *cop0; | |
1120 | ||
1121 | if (!vcpu) | |
1122 | return -1; | |
1123 | ||
6ad78a5c DZ |
1124 | kvm_debug("VCPU Register Dump:\n"); |
1125 | kvm_debug("\tpc = 0x%08lx\n", vcpu->arch.pc); | |
1126 | kvm_debug("\texceptions: %08lx\n", vcpu->arch.pending_exceptions); | |
669e846e SL |
1127 | |
1128 | for (i = 0; i < 32; i += 4) { | |
6ad78a5c | 1129 | kvm_debug("\tgpr%02d: %08lx %08lx %08lx %08lx\n", i, |
669e846e SL |
1130 | vcpu->arch.gprs[i], |
1131 | vcpu->arch.gprs[i + 1], | |
1132 | vcpu->arch.gprs[i + 2], vcpu->arch.gprs[i + 3]); | |
1133 | } | |
6ad78a5c DZ |
1134 | kvm_debug("\thi: 0x%08lx\n", vcpu->arch.hi); |
1135 | kvm_debug("\tlo: 0x%08lx\n", vcpu->arch.lo); | |
669e846e SL |
1136 | |
1137 | cop0 = vcpu->arch.cop0; | |
a27660f3 | 1138 | kvm_debug("\tStatus: 0x%08x, Cause: 0x%08x\n", |
6ad78a5c DZ |
1139 | kvm_read_c0_guest_status(cop0), |
1140 | kvm_read_c0_guest_cause(cop0)); | |
669e846e | 1141 | |
6ad78a5c | 1142 | kvm_debug("\tEPC: 0x%08lx\n", kvm_read_c0_guest_epc(cop0)); |
669e846e SL |
1143 | |
1144 | return 0; | |
1145 | } | |
1146 | ||
1147 | int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) | |
1148 | { | |
1149 | int i; | |
1150 | ||
8d17dd04 | 1151 | for (i = 1; i < ARRAY_SIZE(vcpu->arch.gprs); i++) |
bf32ebf6 | 1152 | vcpu->arch.gprs[i] = regs->gpr[i]; |
8d17dd04 | 1153 | vcpu->arch.gprs[0] = 0; /* zero is special, and cannot be set. */ |
669e846e SL |
1154 | vcpu->arch.hi = regs->hi; |
1155 | vcpu->arch.lo = regs->lo; | |
1156 | vcpu->arch.pc = regs->pc; | |
1157 | ||
4c73fb2b | 1158 | return 0; |
669e846e SL |
1159 | } |
1160 | ||
1161 | int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) | |
1162 | { | |
1163 | int i; | |
1164 | ||
8d17dd04 | 1165 | for (i = 0; i < ARRAY_SIZE(vcpu->arch.gprs); i++) |
bf32ebf6 | 1166 | regs->gpr[i] = vcpu->arch.gprs[i]; |
669e846e SL |
1167 | |
1168 | regs->hi = vcpu->arch.hi; | |
1169 | regs->lo = vcpu->arch.lo; | |
1170 | regs->pc = vcpu->arch.pc; | |
1171 | ||
4c73fb2b | 1172 | return 0; |
669e846e SL |
1173 | } |
1174 | ||
0fae34f4 | 1175 | static void kvm_mips_comparecount_func(unsigned long data) |
669e846e SL |
1176 | { |
1177 | struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data; | |
1178 | ||
1179 | kvm_mips_callbacks->queue_timer_int(vcpu); | |
1180 | ||
1181 | vcpu->arch.wait = 0; | |
4c0b4bc6 | 1182 | if (swq_has_sleeper(&vcpu->wq)) |
8577370f | 1183 | swake_up(&vcpu->wq); |
669e846e SL |
1184 | } |
1185 | ||
d116e812 | 1186 | /* low level hrtimer wake routine */ |
0fae34f4 | 1187 | static enum hrtimer_restart kvm_mips_comparecount_wakeup(struct hrtimer *timer) |
669e846e SL |
1188 | { |
1189 | struct kvm_vcpu *vcpu; | |
1190 | ||
1191 | vcpu = container_of(timer, struct kvm_vcpu, arch.comparecount_timer); | |
1192 | kvm_mips_comparecount_func((unsigned long) vcpu); | |
e30492bb | 1193 | return kvm_mips_count_timeout(vcpu); |
669e846e SL |
1194 | } |
1195 | ||
1196 | int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) | |
1197 | { | |
f7f1427d JH |
1198 | int err; |
1199 | ||
1200 | err = kvm_mips_callbacks->vcpu_init(vcpu); | |
1201 | if (err) | |
1202 | return err; | |
1203 | ||
669e846e SL |
1204 | hrtimer_init(&vcpu->arch.comparecount_timer, CLOCK_MONOTONIC, |
1205 | HRTIMER_MODE_REL); | |
1206 | vcpu->arch.comparecount_timer.function = kvm_mips_comparecount_wakeup; | |
669e846e SL |
1207 | return 0; |
1208 | } | |
1209 | ||
630766b3 JH |
1210 | void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) |
1211 | { | |
1212 | kvm_mips_callbacks->vcpu_uninit(vcpu); | |
1213 | } | |
1214 | ||
d116e812 DZ |
1215 | int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, |
1216 | struct kvm_translation *tr) | |
669e846e SL |
1217 | { |
1218 | return 0; | |
1219 | } | |
1220 | ||
1221 | /* Initial guest state */ | |
1222 | int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) | |
1223 | { | |
1224 | return kvm_mips_callbacks->vcpu_setup(vcpu); | |
1225 | } | |
1226 | ||
d116e812 | 1227 | static void kvm_mips_set_c0_status(void) |
669e846e | 1228 | { |
8cffd197 | 1229 | u32 status = read_c0_status(); |
669e846e | 1230 | |
669e846e SL |
1231 | if (cpu_has_dsp) |
1232 | status |= (ST0_MX); | |
1233 | ||
1234 | write_c0_status(status); | |
1235 | ehb(); | |
1236 | } | |
1237 | ||
1238 | /* | |
1239 | * Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV) | |
1240 | */ | |
1241 | int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu) | |
1242 | { | |
8cffd197 JH |
1243 | u32 cause = vcpu->arch.host_cp0_cause; |
1244 | u32 exccode = (cause >> CAUSEB_EXCCODE) & 0x1f; | |
1245 | u32 __user *opc = (u32 __user *) vcpu->arch.pc; | |
669e846e SL |
1246 | unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr; |
1247 | enum emulation_result er = EMULATE_DONE; | |
122e51d4 | 1248 | u32 inst; |
669e846e SL |
1249 | int ret = RESUME_GUEST; |
1250 | ||
4841e0dd JH |
1251 | vcpu->mode = OUTSIDE_GUEST_MODE; |
1252 | ||
c4c6f2ca | 1253 | /* re-enable HTW before enabling interrupts */ |
ea1bdbf6 JH |
1254 | if (!IS_ENABLED(CONFIG_KVM_MIPS_VZ)) |
1255 | htw_start(); | |
c4c6f2ca | 1256 | |
669e846e SL |
1257 | /* Set a default exit reason */ |
1258 | run->exit_reason = KVM_EXIT_UNKNOWN; | |
1259 | run->ready_for_interrupt_injection = 1; | |
1260 | ||
d116e812 DZ |
1261 | /* |
1262 | * Set the appropriate status bits based on host CPU features, | |
1263 | * before we hit the scheduler | |
1264 | */ | |
669e846e SL |
1265 | kvm_mips_set_c0_status(); |
1266 | ||
1267 | local_irq_enable(); | |
1268 | ||
1269 | kvm_debug("kvm_mips_handle_exit: cause: %#x, PC: %p, kvm_run: %p, kvm_vcpu: %p\n", | |
1270 | cause, opc, run, vcpu); | |
1e09e86a | 1271 | trace_kvm_exit(vcpu, exccode); |
669e846e | 1272 | |
ea1bdbf6 JH |
1273 | if (!IS_ENABLED(CONFIG_KVM_MIPS_VZ)) { |
1274 | /* | |
1275 | * Do a privilege check, if in UM most of these exit conditions | |
1276 | * end up causing an exception to be delivered to the Guest | |
1277 | * Kernel | |
1278 | */ | |
1279 | er = kvm_mips_check_privilege(cause, opc, run, vcpu); | |
1280 | if (er == EMULATE_PRIV_FAIL) { | |
1281 | goto skip_emul; | |
1282 | } else if (er == EMULATE_FAIL) { | |
1283 | run->exit_reason = KVM_EXIT_INTERNAL_ERROR; | |
1284 | ret = RESUME_HOST; | |
1285 | goto skip_emul; | |
1286 | } | |
669e846e SL |
1287 | } |
1288 | ||
1289 | switch (exccode) { | |
16d100db JH |
1290 | case EXCCODE_INT: |
1291 | kvm_debug("[%d]EXCCODE_INT @ %p\n", vcpu->vcpu_id, opc); | |
669e846e SL |
1292 | |
1293 | ++vcpu->stat.int_exits; | |
669e846e | 1294 | |
d116e812 | 1295 | if (need_resched()) |
669e846e | 1296 | cond_resched(); |
669e846e SL |
1297 | |
1298 | ret = RESUME_GUEST; | |
1299 | break; | |
1300 | ||
16d100db JH |
1301 | case EXCCODE_CPU: |
1302 | kvm_debug("EXCCODE_CPU: @ PC: %p\n", opc); | |
669e846e SL |
1303 | |
1304 | ++vcpu->stat.cop_unusable_exits; | |
669e846e SL |
1305 | ret = kvm_mips_callbacks->handle_cop_unusable(vcpu); |
1306 | /* XXXKYMA: Might need to return to user space */ | |
d116e812 | 1307 | if (run->exit_reason == KVM_EXIT_IRQ_WINDOW_OPEN) |
669e846e | 1308 | ret = RESUME_HOST; |
669e846e SL |
1309 | break; |
1310 | ||
16d100db | 1311 | case EXCCODE_MOD: |
669e846e | 1312 | ++vcpu->stat.tlbmod_exits; |
669e846e SL |
1313 | ret = kvm_mips_callbacks->handle_tlb_mod(vcpu); |
1314 | break; | |
1315 | ||
16d100db | 1316 | case EXCCODE_TLBS: |
a27660f3 | 1317 | kvm_debug("TLB ST fault: cause %#x, status %#x, PC: %p, BadVaddr: %#lx\n", |
d116e812 DZ |
1318 | cause, kvm_read_c0_guest_status(vcpu->arch.cop0), opc, |
1319 | badvaddr); | |
669e846e SL |
1320 | |
1321 | ++vcpu->stat.tlbmiss_st_exits; | |
669e846e SL |
1322 | ret = kvm_mips_callbacks->handle_tlb_st_miss(vcpu); |
1323 | break; | |
1324 | ||
16d100db | 1325 | case EXCCODE_TLBL: |
669e846e SL |
1326 | kvm_debug("TLB LD fault: cause %#x, PC: %p, BadVaddr: %#lx\n", |
1327 | cause, opc, badvaddr); | |
1328 | ||
1329 | ++vcpu->stat.tlbmiss_ld_exits; | |
669e846e SL |
1330 | ret = kvm_mips_callbacks->handle_tlb_ld_miss(vcpu); |
1331 | break; | |
1332 | ||
16d100db | 1333 | case EXCCODE_ADES: |
669e846e | 1334 | ++vcpu->stat.addrerr_st_exits; |
669e846e SL |
1335 | ret = kvm_mips_callbacks->handle_addr_err_st(vcpu); |
1336 | break; | |
1337 | ||
16d100db | 1338 | case EXCCODE_ADEL: |
669e846e | 1339 | ++vcpu->stat.addrerr_ld_exits; |
669e846e SL |
1340 | ret = kvm_mips_callbacks->handle_addr_err_ld(vcpu); |
1341 | break; | |
1342 | ||
16d100db | 1343 | case EXCCODE_SYS: |
669e846e | 1344 | ++vcpu->stat.syscall_exits; |
669e846e SL |
1345 | ret = kvm_mips_callbacks->handle_syscall(vcpu); |
1346 | break; | |
1347 | ||
16d100db | 1348 | case EXCCODE_RI: |
669e846e | 1349 | ++vcpu->stat.resvd_inst_exits; |
669e846e SL |
1350 | ret = kvm_mips_callbacks->handle_res_inst(vcpu); |
1351 | break; | |
1352 | ||
16d100db | 1353 | case EXCCODE_BP: |
669e846e | 1354 | ++vcpu->stat.break_inst_exits; |
669e846e SL |
1355 | ret = kvm_mips_callbacks->handle_break(vcpu); |
1356 | break; | |
1357 | ||
16d100db | 1358 | case EXCCODE_TR: |
0a560427 | 1359 | ++vcpu->stat.trap_inst_exits; |
0a560427 JH |
1360 | ret = kvm_mips_callbacks->handle_trap(vcpu); |
1361 | break; | |
1362 | ||
16d100db | 1363 | case EXCCODE_MSAFPE: |
c2537ed9 | 1364 | ++vcpu->stat.msa_fpe_exits; |
c2537ed9 JH |
1365 | ret = kvm_mips_callbacks->handle_msa_fpe(vcpu); |
1366 | break; | |
1367 | ||
16d100db | 1368 | case EXCCODE_FPE: |
1c0cd66a | 1369 | ++vcpu->stat.fpe_exits; |
1c0cd66a JH |
1370 | ret = kvm_mips_callbacks->handle_fpe(vcpu); |
1371 | break; | |
1372 | ||
16d100db | 1373 | case EXCCODE_MSADIS: |
c2537ed9 | 1374 | ++vcpu->stat.msa_disabled_exits; |
98119ad5 JH |
1375 | ret = kvm_mips_callbacks->handle_msa_disabled(vcpu); |
1376 | break; | |
1377 | ||
28c1e762 JH |
1378 | case EXCCODE_GE: |
1379 | /* defer exit accounting to handler */ | |
1380 | ret = kvm_mips_callbacks->handle_guest_exit(vcpu); | |
1381 | break; | |
1382 | ||
669e846e | 1383 | default: |
122e51d4 JH |
1384 | if (cause & CAUSEF_BD) |
1385 | opc += 1; | |
1386 | inst = 0; | |
6a97c775 | 1387 | kvm_get_badinstr(opc, vcpu, &inst); |
a27660f3 | 1388 | kvm_err("Exception Code: %d, not yet handled, @ PC: %p, inst: 0x%08x BadVaddr: %#lx Status: %#x\n", |
122e51d4 | 1389 | exccode, opc, inst, badvaddr, |
d116e812 | 1390 | kvm_read_c0_guest_status(vcpu->arch.cop0)); |
669e846e SL |
1391 | kvm_arch_vcpu_dump_regs(vcpu); |
1392 | run->exit_reason = KVM_EXIT_INTERNAL_ERROR; | |
1393 | ret = RESUME_HOST; | |
1394 | break; | |
1395 | ||
1396 | } | |
1397 | ||
1398 | skip_emul: | |
1399 | local_irq_disable(); | |
1400 | ||
f4474d50 JH |
1401 | if (ret == RESUME_GUEST) |
1402 | kvm_vz_acquire_htimer(vcpu); | |
1403 | ||
669e846e SL |
1404 | if (er == EMULATE_DONE && !(ret & RESUME_HOST)) |
1405 | kvm_mips_deliver_interrupts(vcpu, cause); | |
1406 | ||
1407 | if (!(ret & RESUME_HOST)) { | |
d116e812 | 1408 | /* Only check for signals if not already exiting to userspace */ |
669e846e SL |
1409 | if (signal_pending(current)) { |
1410 | run->exit_reason = KVM_EXIT_INTR; | |
1411 | ret = (-EINTR << 2) | RESUME_HOST; | |
1412 | ++vcpu->stat.signal_exits; | |
1e09e86a | 1413 | trace_kvm_exit(vcpu, KVM_TRACE_EXIT_SIGNAL); |
669e846e SL |
1414 | } |
1415 | } | |
1416 | ||
98e91b84 | 1417 | if (ret == RESUME_GUEST) { |
93258604 JH |
1418 | trace_kvm_reenter(vcpu); |
1419 | ||
4841e0dd JH |
1420 | /* |
1421 | * Make sure the read of VCPU requests in vcpu_reenter() | |
1422 | * callback is not reordered ahead of the write to vcpu->mode, | |
1423 | * or we could miss a TLB flush request while the requester sees | |
1424 | * the VCPU as outside of guest mode and not needing an IPI. | |
1425 | */ | |
1426 | smp_store_mb(vcpu->mode, IN_GUEST_MODE); | |
1427 | ||
a2c046e4 | 1428 | kvm_mips_callbacks->vcpu_reenter(run, vcpu); |
25b08c7f | 1429 | |
98e91b84 | 1430 | /* |
539cb89f JH |
1431 | * If FPU / MSA are enabled (i.e. the guest's FPU / MSA context |
1432 | * is live), restore FCR31 / MSACSR. | |
98e91b84 JH |
1433 | * |
1434 | * This should be before returning to the guest exception | |
539cb89f JH |
1435 | * vector, as it may well cause an [MSA] FP exception if there |
1436 | * are pending exception bits unmasked. (see | |
98e91b84 JH |
1437 | * kvm_mips_csr_die_notifier() for how that is handled). |
1438 | */ | |
1439 | if (kvm_mips_guest_has_fpu(&vcpu->arch) && | |
1440 | read_c0_status() & ST0_CU1) | |
1441 | __kvm_restore_fcsr(&vcpu->arch); | |
539cb89f JH |
1442 | |
1443 | if (kvm_mips_guest_has_msa(&vcpu->arch) && | |
1444 | read_c0_config5() & MIPS_CONF5_MSAEN) | |
1445 | __kvm_restore_msacsr(&vcpu->arch); | |
98e91b84 JH |
1446 | } |
1447 | ||
c4c6f2ca | 1448 | /* Disable HTW before returning to guest or host */ |
ea1bdbf6 JH |
1449 | if (!IS_ENABLED(CONFIG_KVM_MIPS_VZ)) |
1450 | htw_stop(); | |
c4c6f2ca | 1451 | |
669e846e SL |
1452 | return ret; |
1453 | } | |
1454 | ||
98e91b84 JH |
1455 | /* Enable FPU for guest and restore context */ |
1456 | void kvm_own_fpu(struct kvm_vcpu *vcpu) | |
1457 | { | |
1458 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
1459 | unsigned int sr, cfg5; | |
1460 | ||
1461 | preempt_disable(); | |
1462 | ||
539cb89f JH |
1463 | sr = kvm_read_c0_guest_status(cop0); |
1464 | ||
1465 | /* | |
1466 | * If MSA state is already live, it is undefined how it interacts with | |
1467 | * FR=0 FPU state, and we don't want to hit reserved instruction | |
1468 | * exceptions trying to save the MSA state later when CU=1 && FR=1, so | |
1469 | * play it safe and save it first. | |
1470 | * | |
1471 | * In theory we shouldn't ever hit this case since kvm_lose_fpu() should | |
1472 | * get called when guest CU1 is set, however we can't trust the guest | |
1473 | * not to clobber the status register directly via the commpage. | |
1474 | */ | |
1475 | if (cpu_has_msa && sr & ST0_CU1 && !(sr & ST0_FR) && | |
f943176a | 1476 | vcpu->arch.aux_inuse & KVM_MIPS_AUX_MSA) |
539cb89f JH |
1477 | kvm_lose_fpu(vcpu); |
1478 | ||
98e91b84 JH |
1479 | /* |
1480 | * Enable FPU for guest | |
1481 | * We set FR and FRE according to guest context | |
1482 | */ | |
98e91b84 JH |
1483 | change_c0_status(ST0_CU1 | ST0_FR, sr); |
1484 | if (cpu_has_fre) { | |
1485 | cfg5 = kvm_read_c0_guest_config5(cop0); | |
1486 | change_c0_config5(MIPS_CONF5_FRE, cfg5); | |
1487 | } | |
1488 | enable_fpu_hazard(); | |
1489 | ||
1490 | /* If guest FPU state not active, restore it now */ | |
f943176a | 1491 | if (!(vcpu->arch.aux_inuse & KVM_MIPS_AUX_FPU)) { |
98e91b84 | 1492 | __kvm_restore_fpu(&vcpu->arch); |
f943176a | 1493 | vcpu->arch.aux_inuse |= KVM_MIPS_AUX_FPU; |
04ebebf4 JH |
1494 | trace_kvm_aux(vcpu, KVM_TRACE_AUX_RESTORE, KVM_TRACE_AUX_FPU); |
1495 | } else { | |
1496 | trace_kvm_aux(vcpu, KVM_TRACE_AUX_ENABLE, KVM_TRACE_AUX_FPU); | |
98e91b84 JH |
1497 | } |
1498 | ||
1499 | preempt_enable(); | |
1500 | } | |
1501 | ||
539cb89f JH |
1502 | #ifdef CONFIG_CPU_HAS_MSA |
1503 | /* Enable MSA for guest and restore context */ | |
1504 | void kvm_own_msa(struct kvm_vcpu *vcpu) | |
1505 | { | |
1506 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
1507 | unsigned int sr, cfg5; | |
1508 | ||
1509 | preempt_disable(); | |
1510 | ||
1511 | /* | |
1512 | * Enable FPU if enabled in guest, since we're restoring FPU context | |
1513 | * anyway. We set FR and FRE according to guest context. | |
1514 | */ | |
1515 | if (kvm_mips_guest_has_fpu(&vcpu->arch)) { | |
1516 | sr = kvm_read_c0_guest_status(cop0); | |
1517 | ||
1518 | /* | |
1519 | * If FR=0 FPU state is already live, it is undefined how it | |
1520 | * interacts with MSA state, so play it safe and save it first. | |
1521 | */ | |
1522 | if (!(sr & ST0_FR) && | |
f943176a JH |
1523 | (vcpu->arch.aux_inuse & (KVM_MIPS_AUX_FPU | |
1524 | KVM_MIPS_AUX_MSA)) == KVM_MIPS_AUX_FPU) | |
539cb89f JH |
1525 | kvm_lose_fpu(vcpu); |
1526 | ||
1527 | change_c0_status(ST0_CU1 | ST0_FR, sr); | |
1528 | if (sr & ST0_CU1 && cpu_has_fre) { | |
1529 | cfg5 = kvm_read_c0_guest_config5(cop0); | |
1530 | change_c0_config5(MIPS_CONF5_FRE, cfg5); | |
1531 | } | |
1532 | } | |
1533 | ||
1534 | /* Enable MSA for guest */ | |
1535 | set_c0_config5(MIPS_CONF5_MSAEN); | |
1536 | enable_fpu_hazard(); | |
1537 | ||
f943176a JH |
1538 | switch (vcpu->arch.aux_inuse & (KVM_MIPS_AUX_FPU | KVM_MIPS_AUX_MSA)) { |
1539 | case KVM_MIPS_AUX_FPU: | |
539cb89f JH |
1540 | /* |
1541 | * Guest FPU state already loaded, only restore upper MSA state | |
1542 | */ | |
1543 | __kvm_restore_msa_upper(&vcpu->arch); | |
f943176a | 1544 | vcpu->arch.aux_inuse |= KVM_MIPS_AUX_MSA; |
04ebebf4 | 1545 | trace_kvm_aux(vcpu, KVM_TRACE_AUX_RESTORE, KVM_TRACE_AUX_MSA); |
539cb89f JH |
1546 | break; |
1547 | case 0: | |
1548 | /* Neither FPU or MSA already active, restore full MSA state */ | |
1549 | __kvm_restore_msa(&vcpu->arch); | |
f943176a | 1550 | vcpu->arch.aux_inuse |= KVM_MIPS_AUX_MSA; |
539cb89f | 1551 | if (kvm_mips_guest_has_fpu(&vcpu->arch)) |
f943176a | 1552 | vcpu->arch.aux_inuse |= KVM_MIPS_AUX_FPU; |
04ebebf4 JH |
1553 | trace_kvm_aux(vcpu, KVM_TRACE_AUX_RESTORE, |
1554 | KVM_TRACE_AUX_FPU_MSA); | |
539cb89f JH |
1555 | break; |
1556 | default: | |
04ebebf4 | 1557 | trace_kvm_aux(vcpu, KVM_TRACE_AUX_ENABLE, KVM_TRACE_AUX_MSA); |
539cb89f JH |
1558 | break; |
1559 | } | |
1560 | ||
1561 | preempt_enable(); | |
1562 | } | |
1563 | #endif | |
1564 | ||
1565 | /* Drop FPU & MSA without saving it */ | |
98e91b84 JH |
1566 | void kvm_drop_fpu(struct kvm_vcpu *vcpu) |
1567 | { | |
1568 | preempt_disable(); | |
f943176a | 1569 | if (cpu_has_msa && vcpu->arch.aux_inuse & KVM_MIPS_AUX_MSA) { |
539cb89f | 1570 | disable_msa(); |
04ebebf4 | 1571 | trace_kvm_aux(vcpu, KVM_TRACE_AUX_DISCARD, KVM_TRACE_AUX_MSA); |
f943176a | 1572 | vcpu->arch.aux_inuse &= ~KVM_MIPS_AUX_MSA; |
539cb89f | 1573 | } |
f943176a | 1574 | if (vcpu->arch.aux_inuse & KVM_MIPS_AUX_FPU) { |
98e91b84 | 1575 | clear_c0_status(ST0_CU1 | ST0_FR); |
04ebebf4 | 1576 | trace_kvm_aux(vcpu, KVM_TRACE_AUX_DISCARD, KVM_TRACE_AUX_FPU); |
f943176a | 1577 | vcpu->arch.aux_inuse &= ~KVM_MIPS_AUX_FPU; |
98e91b84 JH |
1578 | } |
1579 | preempt_enable(); | |
1580 | } | |
1581 | ||
539cb89f | 1582 | /* Save and disable FPU & MSA */ |
98e91b84 JH |
1583 | void kvm_lose_fpu(struct kvm_vcpu *vcpu) |
1584 | { | |
1585 | /* | |
c58cf741 JH |
1586 | * With T&E, FPU & MSA get disabled in root context (hardware) when it |
1587 | * is disabled in guest context (software), but the register state in | |
1588 | * the hardware may still be in use. | |
1589 | * This is why we explicitly re-enable the hardware before saving. | |
98e91b84 JH |
1590 | */ |
1591 | ||
1592 | preempt_disable(); | |
f943176a | 1593 | if (cpu_has_msa && vcpu->arch.aux_inuse & KVM_MIPS_AUX_MSA) { |
c58cf741 JH |
1594 | if (!IS_ENABLED(CONFIG_KVM_MIPS_VZ)) { |
1595 | set_c0_config5(MIPS_CONF5_MSAEN); | |
1596 | enable_fpu_hazard(); | |
1597 | } | |
539cb89f JH |
1598 | |
1599 | __kvm_save_msa(&vcpu->arch); | |
04ebebf4 | 1600 | trace_kvm_aux(vcpu, KVM_TRACE_AUX_SAVE, KVM_TRACE_AUX_FPU_MSA); |
539cb89f JH |
1601 | |
1602 | /* Disable MSA & FPU */ | |
1603 | disable_msa(); | |
f943176a | 1604 | if (vcpu->arch.aux_inuse & KVM_MIPS_AUX_FPU) { |
539cb89f | 1605 | clear_c0_status(ST0_CU1 | ST0_FR); |
4ac33429 JH |
1606 | disable_fpu_hazard(); |
1607 | } | |
f943176a JH |
1608 | vcpu->arch.aux_inuse &= ~(KVM_MIPS_AUX_FPU | KVM_MIPS_AUX_MSA); |
1609 | } else if (vcpu->arch.aux_inuse & KVM_MIPS_AUX_FPU) { | |
c58cf741 JH |
1610 | if (!IS_ENABLED(CONFIG_KVM_MIPS_VZ)) { |
1611 | set_c0_status(ST0_CU1); | |
1612 | enable_fpu_hazard(); | |
1613 | } | |
98e91b84 JH |
1614 | |
1615 | __kvm_save_fpu(&vcpu->arch); | |
f943176a | 1616 | vcpu->arch.aux_inuse &= ~KVM_MIPS_AUX_FPU; |
04ebebf4 | 1617 | trace_kvm_aux(vcpu, KVM_TRACE_AUX_SAVE, KVM_TRACE_AUX_FPU); |
98e91b84 JH |
1618 | |
1619 | /* Disable FPU */ | |
1620 | clear_c0_status(ST0_CU1 | ST0_FR); | |
4ac33429 | 1621 | disable_fpu_hazard(); |
98e91b84 JH |
1622 | } |
1623 | preempt_enable(); | |
1624 | } | |
1625 | ||
1626 | /* | |
539cb89f JH |
1627 | * Step over a specific ctc1 to FCSR and a specific ctcmsa to MSACSR which are |
1628 | * used to restore guest FCSR/MSACSR state and may trigger a "harmless" FP/MSAFP | |
1629 | * exception if cause bits are set in the value being written. | |
98e91b84 JH |
1630 | */ |
1631 | static int kvm_mips_csr_die_notify(struct notifier_block *self, | |
1632 | unsigned long cmd, void *ptr) | |
1633 | { | |
1634 | struct die_args *args = (struct die_args *)ptr; | |
1635 | struct pt_regs *regs = args->regs; | |
1636 | unsigned long pc; | |
1637 | ||
539cb89f JH |
1638 | /* Only interested in FPE and MSAFPE */ |
1639 | if (cmd != DIE_FP && cmd != DIE_MSAFP) | |
98e91b84 JH |
1640 | return NOTIFY_DONE; |
1641 | ||
1642 | /* Return immediately if guest context isn't active */ | |
1643 | if (!(current->flags & PF_VCPU)) | |
1644 | return NOTIFY_DONE; | |
1645 | ||
1646 | /* Should never get here from user mode */ | |
1647 | BUG_ON(user_mode(regs)); | |
1648 | ||
1649 | pc = instruction_pointer(regs); | |
1650 | switch (cmd) { | |
1651 | case DIE_FP: | |
1652 | /* match 2nd instruction in __kvm_restore_fcsr */ | |
1653 | if (pc != (unsigned long)&__kvm_restore_fcsr + 4) | |
1654 | return NOTIFY_DONE; | |
1655 | break; | |
539cb89f JH |
1656 | case DIE_MSAFP: |
1657 | /* match 2nd/3rd instruction in __kvm_restore_msacsr */ | |
1658 | if (!cpu_has_msa || | |
1659 | pc < (unsigned long)&__kvm_restore_msacsr + 4 || | |
1660 | pc > (unsigned long)&__kvm_restore_msacsr + 8) | |
1661 | return NOTIFY_DONE; | |
1662 | break; | |
98e91b84 JH |
1663 | } |
1664 | ||
1665 | /* Move PC forward a little and continue executing */ | |
1666 | instruction_pointer(regs) += 4; | |
1667 | ||
1668 | return NOTIFY_STOP; | |
1669 | } | |
1670 | ||
1671 | static struct notifier_block kvm_mips_csr_die_notifier = { | |
1672 | .notifier_call = kvm_mips_csr_die_notify, | |
1673 | }; | |
1674 | ||
2db9d233 | 1675 | static int __init kvm_mips_init(void) |
669e846e SL |
1676 | { |
1677 | int ret; | |
1678 | ||
1e5217f5 JH |
1679 | ret = kvm_mips_entry_setup(); |
1680 | if (ret) | |
1681 | return ret; | |
1682 | ||
669e846e SL |
1683 | ret = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE); |
1684 | ||
1685 | if (ret) | |
1686 | return ret; | |
1687 | ||
98e91b84 JH |
1688 | register_die_notifier(&kvm_mips_csr_die_notifier); |
1689 | ||
669e846e SL |
1690 | return 0; |
1691 | } | |
1692 | ||
2db9d233 | 1693 | static void __exit kvm_mips_exit(void) |
669e846e SL |
1694 | { |
1695 | kvm_exit(); | |
1696 | ||
98e91b84 | 1697 | unregister_die_notifier(&kvm_mips_csr_die_notifier); |
669e846e SL |
1698 | } |
1699 | ||
1700 | module_init(kvm_mips_init); | |
1701 | module_exit(kvm_mips_exit); | |
1702 | ||
1703 | EXPORT_TRACEPOINT_SYMBOL(kvm_exit); |