arch/powerpc/kvm/book3s

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This source file includes following definitions.
ics_deliver_irq
ics_check_resend
write_xive
kvmppc_xics_set_xive
kvmppc_xics_get_xive
kvmppc_xics_int_on
kvmppc_xics_int_off
icp_try_update
icp_check_resend
icp_try_to_deliver
icp_deliver_irq
icp_down_cppr
kvmppc_h_xirr
kvmppc_h_ipi
kvmppc_h_ipoll
kvmppc_h_cppr
ics_eoi
kvmppc_h_eoi
kvmppc_xics_rm_complete
kvmppc_xics_hcall
xics_debugfs_irqmap
xics_debug_show
xics_debugfs_init
kvmppc_xics_create_ics
kvmppc_xics_create_icp
kvmppc_xics_get_icp
kvmppc_xics_set_icp
xics_get_source
xics_set_source
kvmppc_xics_set_irq
xics_set_attr
xics_get_attr
xics_has_attr
kvmppc_xics_free
kvmppc_xics_create
kvmppc_xics_init
kvmppc_xics_connect_vcpu
kvmppc_xics_free_icp
kvmppc_xics_set_mapped
kvmppc_xics_clr_mapped
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2012 Michael Ellerman, IBM Corporation.
   4  * Copyright 2012 Benjamin Herrenschmidt, IBM Corporation.
   5  */
   6 
   7 #include <linux/kernel.h>
   8 #include <linux/kvm_host.h>
   9 #include <linux/err.h>
  10 #include <linux/gfp.h>
  11 #include <linux/anon_inodes.h>
  12 #include <linux/spinlock.h>
  13 
  14 #include <linux/uaccess.h>
  15 #include <asm/kvm_book3s.h>
  16 #include <asm/kvm_ppc.h>
  17 #include <asm/hvcall.h>
  18 #include <asm/xics.h>
  19 #include <asm/debugfs.h>
  20 #include <asm/time.h>
  21 
  22 #include <linux/seq_file.h>
  23 
  24 #include "book3s_xics.h"
  25 
  26 #if 1
  27 #define XICS_DBG(fmt...) do { } while (0)
  28 #else
  29 #define XICS_DBG(fmt...) trace_printk(fmt)
  30 #endif
  31 
  32 #define ENABLE_REALMODE true
  33 #define DEBUG_REALMODE  false
  34 
  35 /*
  36  * LOCKING
  37  * =======
  38  *
  39  * Each ICS has a spin lock protecting the information about the IRQ
  40  * sources and avoiding simultaneous deliveries of the same interrupt.
  41  *
  42  * ICP operations are done via a single compare & swap transaction
  43  * (most ICP state fits in the union kvmppc_icp_state)
  44  */
  45 
  46 /*
  47  * TODO
  48  * ====
  49  *
  50  * - To speed up resends, keep a bitmap of "resend" set bits in the
  51  *   ICS
  52  *
  53  * - Speed up server# -> ICP lookup (array ? hash table ?)
  54  *
  55  * - Make ICS lockless as well, or at least a per-interrupt lock or hashed
  56  *   locks array to improve scalability
  57  */
  58 
  59 /* -- ICS routines -- */
  60 
  61 static void icp_deliver_irq(struct kvmppc_xics *xics, struct kvmppc_icp *icp,
  62                             u32 new_irq, bool check_resend);
  63 
  64 /*
  65  * Return value ideally indicates how the interrupt was handled, but no
  66  * callers look at it (given that we don't implement KVM_IRQ_LINE_STATUS),
  67  * so just return 0.
  68  */
  69 static int ics_deliver_irq(struct kvmppc_xics *xics, u32 irq, u32 level)
  70 {
  71         struct ics_irq_state *state;
  72         struct kvmppc_ics *ics;
  73         u16 src;
  74         u32 pq_old, pq_new;
  75 
  76         XICS_DBG("ics deliver %#x (level: %d)\n", irq, level);
  77 
  78         ics = kvmppc_xics_find_ics(xics, irq, &src);
  79         if (!ics) {
  80                 XICS_DBG("ics_deliver_irq: IRQ 0x%06x not found !\n", irq);
  81                 return -EINVAL;
  82         }
  83         state = &ics->irq_state[src];
  84         if (!state->exists)
  85                 return -EINVAL;
  86 
  87         if (level == KVM_INTERRUPT_SET_LEVEL || level == KVM_INTERRUPT_SET)
  88                 level = 1;
  89         else if (level == KVM_INTERRUPT_UNSET)
  90                 level = 0;
  91         /*
  92          * Take other values the same as 1, consistent with original code.
  93          * maybe WARN here?
  94          */
  95 
  96         if (!state->lsi && level == 0) /* noop for MSI */
  97                 return 0;
  98 
  99         do {
 100                 pq_old = state->pq_state;
 101                 if (state->lsi) {
 102                         if (level) {
 103                                 if (pq_old & PQ_PRESENTED)
 104                                         /* Setting already set LSI ... */
 105                                         return 0;
 106 
 107                                 pq_new = PQ_PRESENTED;
 108                         } else
 109                                 pq_new = 0;
 110                 } else
 111                         pq_new = ((pq_old << 1) & 3) | PQ_PRESENTED;
 112         } while (cmpxchg(&state->pq_state, pq_old, pq_new) != pq_old);
 113 
 114         /* Test P=1, Q=0, this is the only case where we present */
 115         if (pq_new == PQ_PRESENTED)
 116                 icp_deliver_irq(xics, NULL, irq, false);
 117 
 118         /* Record which CPU this arrived on for passed-through interrupts */
 119         if (state->host_irq)
 120                 state->intr_cpu = raw_smp_processor_id();
 121 
 122         return 0;
 123 }
 124 
 125 static void ics_check_resend(struct kvmppc_xics *xics, struct kvmppc_ics *ics,
 126                              struct kvmppc_icp *icp)
 127 {
 128         int i;
 129 
 130         for (i = 0; i < KVMPPC_XICS_IRQ_PER_ICS; i++) {
 131                 struct ics_irq_state *state = &ics->irq_state[i];
 132                 if (state->resend) {
 133                         XICS_DBG("resend %#x prio %#x\n", state->number,
 134                                       state->priority);
 135                         icp_deliver_irq(xics, icp, state->number, true);
 136                 }
 137         }
 138 }
 139 
 140 static bool write_xive(struct kvmppc_xics *xics, struct kvmppc_ics *ics,
 141                        struct ics_irq_state *state,
 142                        u32 server, u32 priority, u32 saved_priority)
 143 {
 144         bool deliver;
 145         unsigned long flags;
 146 
 147         local_irq_save(flags);
 148         arch_spin_lock(&ics->lock);
 149 
 150         state->server = server;
 151         state->priority = priority;
 152         state->saved_priority = saved_priority;
 153         deliver = false;
 154         if ((state->masked_pending || state->resend) && priority != MASKED) {
 155                 state->masked_pending = 0;
 156                 state->resend = 0;
 157                 deliver = true;
 158         }
 159 
 160         arch_spin_unlock(&ics->lock);
 161         local_irq_restore(flags);
 162 
 163         return deliver;
 164 }
 165 
 166 int kvmppc_xics_set_xive(struct kvm *kvm, u32 irq, u32 server, u32 priority)
 167 {
 168         struct kvmppc_xics *xics = kvm->arch.xics;
 169         struct kvmppc_icp *icp;
 170         struct kvmppc_ics *ics;
 171         struct ics_irq_state *state;
 172         u16 src;
 173 
 174         if (!xics)
 175                 return -ENODEV;
 176 
 177         ics = kvmppc_xics_find_ics(xics, irq, &src);
 178         if (!ics)
 179                 return -EINVAL;
 180         state = &ics->irq_state[src];
 181 
 182         icp = kvmppc_xics_find_server(kvm, server);
 183         if (!icp)
 184                 return -EINVAL;
 185 
 186         XICS_DBG("set_xive %#x server %#x prio %#x MP:%d RS:%d\n",
 187                  irq, server, priority,
 188                  state->masked_pending, state->resend);
 189 
 190         if (write_xive(xics, ics, state, server, priority, priority))
 191                 icp_deliver_irq(xics, icp, irq, false);
 192 
 193         return 0;
 194 }
 195 
 196 int kvmppc_xics_get_xive(struct kvm *kvm, u32 irq, u32 *server, u32 *priority)
 197 {
 198         struct kvmppc_xics *xics = kvm->arch.xics;
 199         struct kvmppc_ics *ics;
 200         struct ics_irq_state *state;
 201         u16 src;
 202         unsigned long flags;
 203 
 204         if (!xics)
 205                 return -ENODEV;
 206 
 207         ics = kvmppc_xics_find_ics(xics, irq, &src);
 208         if (!ics)
 209                 return -EINVAL;
 210         state = &ics->irq_state[src];
 211 
 212         local_irq_save(flags);
 213         arch_spin_lock(&ics->lock);
 214         *server = state->server;
 215         *priority = state->priority;
 216         arch_spin_unlock(&ics->lock);
 217         local_irq_restore(flags);
 218 
 219         return 0;
 220 }
 221 
 222 int kvmppc_xics_int_on(struct kvm *kvm, u32 irq)
 223 {
 224         struct kvmppc_xics *xics = kvm->arch.xics;
 225         struct kvmppc_icp *icp;
 226         struct kvmppc_ics *ics;
 227         struct ics_irq_state *state;
 228         u16 src;
 229 
 230         if (!xics)
 231                 return -ENODEV;
 232 
 233         ics = kvmppc_xics_find_ics(xics, irq, &src);
 234         if (!ics)
 235                 return -EINVAL;
 236         state = &ics->irq_state[src];
 237 
 238         icp = kvmppc_xics_find_server(kvm, state->server);
 239         if (!icp)
 240                 return -EINVAL;
 241 
 242         if (write_xive(xics, ics, state, state->server, state->saved_priority,
 243                        state->saved_priority))
 244                 icp_deliver_irq(xics, icp, irq, false);
 245 
 246         return 0;
 247 }
 248 
 249 int kvmppc_xics_int_off(struct kvm *kvm, u32 irq)
 250 {
 251         struct kvmppc_xics *xics = kvm->arch.xics;
 252         struct kvmppc_ics *ics;
 253         struct ics_irq_state *state;
 254         u16 src;
 255 
 256         if (!xics)
 257                 return -ENODEV;
 258 
 259         ics = kvmppc_xics_find_ics(xics, irq, &src);
 260         if (!ics)
 261                 return -EINVAL;
 262         state = &ics->irq_state[src];
 263 
 264         write_xive(xics, ics, state, state->server, MASKED, state->priority);
 265 
 266         return 0;
 267 }
 268 
 269 /* -- ICP routines, including hcalls -- */
 270 
 271 static inline bool icp_try_update(struct kvmppc_icp *icp,
 272                                   union kvmppc_icp_state old,
 273                                   union kvmppc_icp_state new,
 274                                   bool change_self)
 275 {
 276         bool success;
 277 
 278         /* Calculate new output value */
 279         new.out_ee = (new.xisr && (new.pending_pri < new.cppr));
 280 
 281         /* Attempt atomic update */
 282         success = cmpxchg64(&icp->state.raw, old.raw, new.raw) == old.raw;
 283         if (!success)
 284                 goto bail;
 285 
 286         XICS_DBG("UPD [%04lx] - C:%02x M:%02x PP: %02x PI:%06x R:%d O:%d\n",
 287                  icp->server_num,
 288                  old.cppr, old.mfrr, old.pending_pri, old.xisr,
 289                  old.need_resend, old.out_ee);
 290         XICS_DBG("UPD        - C:%02x M:%02x PP: %02x PI:%06x R:%d O:%d\n",
 291                  new.cppr, new.mfrr, new.pending_pri, new.xisr,
 292                  new.need_resend, new.out_ee);
 293         /*
 294          * Check for output state update
 295          *
 296          * Note that this is racy since another processor could be updating
 297          * the state already. This is why we never clear the interrupt output
 298          * here, we only ever set it. The clear only happens prior to doing
 299          * an update and only by the processor itself. Currently we do it
 300          * in Accept (H_XIRR) and Up_Cppr (H_XPPR).
 301          *
 302          * We also do not try to figure out whether the EE state has changed,
 303          * we unconditionally set it if the new state calls for it. The reason
 304          * for that is that we opportunistically remove the pending interrupt
 305          * flag when raising CPPR, so we need to set it back here if an
 306          * interrupt is still pending.
 307          */
 308         if (new.out_ee) {
 309                 kvmppc_book3s_queue_irqprio(icp->vcpu,
 310                                             BOOK3S_INTERRUPT_EXTERNAL);
 311                 if (!change_self)
 312                         kvmppc_fast_vcpu_kick(icp->vcpu);
 313         }
 314  bail:
 315         return success;
 316 }
 317 
 318 static void icp_check_resend(struct kvmppc_xics *xics,
 319                              struct kvmppc_icp *icp)
 320 {
 321         u32 icsid;
 322 
 323         /* Order this load with the test for need_resend in the caller */
 324         smp_rmb();
 325         for_each_set_bit(icsid, icp->resend_map, xics->max_icsid + 1) {
 326                 struct kvmppc_ics *ics = xics->ics[icsid];
 327 
 328                 if (!test_and_clear_bit(icsid, icp->resend_map))
 329                         continue;
 330                 if (!ics)
 331                         continue;
 332                 ics_check_resend(xics, ics, icp);
 333         }
 334 }
 335 
 336 static bool icp_try_to_deliver(struct kvmppc_icp *icp, u32 irq, u8 priority,
 337                                u32 *reject)
 338 {
 339         union kvmppc_icp_state old_state, new_state;
 340         bool success;
 341 
 342         XICS_DBG("try deliver %#x(P:%#x) to server %#lx\n", irq, priority,
 343                  icp->server_num);
 344 
 345         do {
 346                 old_state = new_state = READ_ONCE(icp->state);
 347 
 348                 *reject = 0;
 349 
 350                 /* See if we can deliver */
 351                 success = new_state.cppr > priority &&
 352                         new_state.mfrr > priority &&
 353                         new_state.pending_pri > priority;
 354 
 355                 /*
 356                  * If we can, check for a rejection and perform the
 357                  * delivery
 358                  */
 359                 if (success) {
 360                         *reject = new_state.xisr;
 361                         new_state.xisr = irq;
 362                         new_state.pending_pri = priority;
 363                 } else {
 364                         /*
 365                          * If we failed to deliver we set need_resend
 366                          * so a subsequent CPPR state change causes us
 367                          * to try a new delivery.
 368                          */
 369                         new_state.need_resend = true;
 370                 }
 371 
 372         } while (!icp_try_update(icp, old_state, new_state, false));
 373 
 374         return success;
 375 }
 376 
 377 static void icp_deliver_irq(struct kvmppc_xics *xics, struct kvmppc_icp *icp,
 378                             u32 new_irq, bool check_resend)
 379 {
 380         struct ics_irq_state *state;
 381         struct kvmppc_ics *ics;
 382         u32 reject;
 383         u16 src;
 384         unsigned long flags;
 385 
 386         /*
 387          * This is used both for initial delivery of an interrupt and
 388          * for subsequent rejection.
 389          *
 390          * Rejection can be racy vs. resends. We have evaluated the
 391          * rejection in an atomic ICP transaction which is now complete,
 392          * so potentially the ICP can already accept the interrupt again.
 393          *
 394          * So we need to retry the delivery. Essentially the reject path
 395          * boils down to a failed delivery. Always.
 396          *
 397          * Now the interrupt could also have moved to a different target,
 398          * thus we may need to re-do the ICP lookup as well
 399          */
 400 
 401  again:
 402         /* Get the ICS state and lock it */
 403         ics = kvmppc_xics_find_ics(xics, new_irq, &src);
 404         if (!ics) {
 405                 XICS_DBG("icp_deliver_irq: IRQ 0x%06x not found !\n", new_irq);
 406                 return;
 407         }
 408         state = &ics->irq_state[src];
 409 
 410         /* Get a lock on the ICS */
 411         local_irq_save(flags);
 412         arch_spin_lock(&ics->lock);
 413 
 414         /* Get our server */
 415         if (!icp || state->server != icp->server_num) {
 416                 icp = kvmppc_xics_find_server(xics->kvm, state->server);
 417                 if (!icp) {
 418                         pr_warn("icp_deliver_irq: IRQ 0x%06x server 0x%x not found !\n",
 419                                 new_irq, state->server);
 420                         goto out;
 421                 }
 422         }
 423 
 424         if (check_resend)
 425                 if (!state->resend)
 426                         goto out;
 427 
 428         /* Clear the resend bit of that interrupt */
 429         state->resend = 0;
 430 
 431         /*
 432          * If masked, bail out
 433          *
 434          * Note: PAPR doesn't mention anything about masked pending
 435          * when doing a resend, only when doing a delivery.
 436          *
 437          * However that would have the effect of losing a masked
 438          * interrupt that was rejected and isn't consistent with
 439          * the whole masked_pending business which is about not
 440          * losing interrupts that occur while masked.
 441          *
 442          * I don't differentiate normal deliveries and resends, this
 443          * implementation will differ from PAPR and not lose such
 444          * interrupts.
 445          */
 446         if (state->priority == MASKED) {
 447                 XICS_DBG("irq %#x masked pending\n", new_irq);
 448                 state->masked_pending = 1;
 449                 goto out;
 450         }
 451 
 452         /*
 453          * Try the delivery, this will set the need_resend flag
 454          * in the ICP as part of the atomic transaction if the
 455          * delivery is not possible.
 456          *
 457          * Note that if successful, the new delivery might have itself
 458          * rejected an interrupt that was "delivered" before we took the
 459          * ics spin lock.
 460          *
 461          * In this case we do the whole sequence all over again for the
 462          * new guy. We cannot assume that the rejected interrupt is less
 463          * favored than the new one, and thus doesn't need to be delivered,
 464          * because by the time we exit icp_try_to_deliver() the target
 465          * processor may well have alrady consumed & completed it, and thus
 466          * the rejected interrupt might actually be already acceptable.
 467          */
 468         if (icp_try_to_deliver(icp, new_irq, state->priority, &reject)) {
 469                 /*
 470                  * Delivery was successful, did we reject somebody else ?
 471                  */
 472                 if (reject && reject != XICS_IPI) {
 473                         arch_spin_unlock(&ics->lock);
 474                         local_irq_restore(flags);
 475                         new_irq = reject;
 476                         check_resend = 0;
 477                         goto again;
 478                 }
 479         } else {
 480                 /*
 481                  * We failed to deliver the interrupt we need to set the
 482                  * resend map bit and mark the ICS state as needing a resend
 483                  */
 484                 state->resend = 1;
 485 
 486                 /*
 487                  * Make sure when checking resend, we don't miss the resend
 488                  * if resend_map bit is seen and cleared.
 489                  */
 490                 smp_wmb();
 491                 set_bit(ics->icsid, icp->resend_map);
 492 
 493                 /*
 494                  * If the need_resend flag got cleared in the ICP some time
 495                  * between icp_try_to_deliver() atomic update and now, then
 496                  * we know it might have missed the resend_map bit. So we
 497                  * retry
 498                  */
 499                 smp_mb();
 500                 if (!icp->state.need_resend) {
 501                         state->resend = 0;
 502                         arch_spin_unlock(&ics->lock);
 503                         local_irq_restore(flags);
 504                         check_resend = 0;
 505                         goto again;
 506                 }
 507         }
 508  out:
 509         arch_spin_unlock(&ics->lock);
 510         local_irq_restore(flags);
 511 }
 512 
 513 static void icp_down_cppr(struct kvmppc_xics *xics, struct kvmppc_icp *icp,
 514                           u8 new_cppr)
 515 {
 516         union kvmppc_icp_state old_state, new_state;
 517         bool resend;
 518 
 519         /*
 520          * This handles several related states in one operation:
 521          *
 522          * ICP State: Down_CPPR
 523          *
 524          * Load CPPR with new value and if the XISR is 0
 525          * then check for resends:
 526          *
 527          * ICP State: Resend
 528          *
 529          * If MFRR is more favored than CPPR, check for IPIs
 530          * and notify ICS of a potential resend. This is done
 531          * asynchronously (when used in real mode, we will have
 532          * to exit here).
 533          *
 534          * We do not handle the complete Check_IPI as documented
 535          * here. In the PAPR, this state will be used for both
 536          * Set_MFRR and Down_CPPR. However, we know that we aren't
 537          * changing the MFRR state here so we don't need to handle
 538          * the case of an MFRR causing a reject of a pending irq,
 539          * this will have been handled when the MFRR was set in the
 540          * first place.
 541          *
 542          * Thus we don't have to handle rejects, only resends.
 543          *
 544          * When implementing real mode for HV KVM, resend will lead to
 545          * a H_TOO_HARD return and the whole transaction will be handled
 546          * in virtual mode.
 547          */
 548         do {
 549                 old_state = new_state = READ_ONCE(icp->state);
 550 
 551                 /* Down_CPPR */
 552                 new_state.cppr = new_cppr;
 553 
 554                 /*
 555                  * Cut down Resend / Check_IPI / IPI
 556                  *
 557                  * The logic is that we cannot have a pending interrupt
 558                  * trumped by an IPI at this point (see above), so we
 559                  * know that either the pending interrupt is already an
 560                  * IPI (in which case we don't care to override it) or
 561                  * it's either more favored than us or non existent
 562                  */
 563                 if (new_state.mfrr < new_cppr &&
 564                     new_state.mfrr <= new_state.pending_pri) {
 565                         WARN_ON(new_state.xisr != XICS_IPI &&
 566                                 new_state.xisr != 0);
 567                         new_state.pending_pri = new_state.mfrr;
 568                         new_state.xisr = XICS_IPI;
 569                 }
 570 
 571                 /* Latch/clear resend bit */
 572                 resend = new_state.need_resend;
 573                 new_state.need_resend = 0;
 574 
 575         } while (!icp_try_update(icp, old_state, new_state, true));
 576 
 577         /*
 578          * Now handle resend checks. Those are asynchronous to the ICP
 579          * state update in HW (ie bus transactions) so we can handle them
 580          * separately here too
 581          */
 582         if (resend)
 583                 icp_check_resend(xics, icp);
 584 }
 585 
 586 static noinline unsigned long kvmppc_h_xirr(struct kvm_vcpu *vcpu)
 587 {
 588         union kvmppc_icp_state old_state, new_state;
 589         struct kvmppc_icp *icp = vcpu->arch.icp;
 590         u32 xirr;
 591 
 592         /* First, remove EE from the processor */
 593         kvmppc_book3s_dequeue_irqprio(icp->vcpu, BOOK3S_INTERRUPT_EXTERNAL);
 594 
 595         /*
 596          * ICP State: Accept_Interrupt
 597          *
 598          * Return the pending interrupt (if any) along with the
 599          * current CPPR, then clear the XISR & set CPPR to the
 600          * pending priority
 601          */
 602         do {
 603                 old_state = new_state = READ_ONCE(icp->state);
 604 
 605                 xirr = old_state.xisr | (((u32)old_state.cppr) << 24);
 606                 if (!old_state.xisr)
 607                         break;
 608                 new_state.cppr = new_state.pending_pri;
 609                 new_state.pending_pri = 0xff;
 610                 new_state.xisr = 0;
 611 
 612         } while (!icp_try_update(icp, old_state, new_state, true));
 613 
 614         XICS_DBG("h_xirr vcpu %d xirr %#x\n", vcpu->vcpu_id, xirr);
 615 
 616         return xirr;
 617 }
 618 
 619 static noinline int kvmppc_h_ipi(struct kvm_vcpu *vcpu, unsigned long server,
 620                                  unsigned long mfrr)
 621 {
 622         union kvmppc_icp_state old_state, new_state;
 623         struct kvmppc_xics *xics = vcpu->kvm->arch.xics;
 624         struct kvmppc_icp *icp;
 625         u32 reject;
 626         bool resend;
 627         bool local;
 628 
 629         XICS_DBG("h_ipi vcpu %d to server %lu mfrr %#lx\n",
 630                  vcpu->vcpu_id, server, mfrr);
 631 
 632         icp = vcpu->arch.icp;
 633         local = icp->server_num == server;
 634         if (!local) {
 635                 icp = kvmppc_xics_find_server(vcpu->kvm, server);
 636                 if (!icp)
 637                         return H_PARAMETER;
 638         }
 639 
 640         /*
 641          * ICP state: Set_MFRR
 642          *
 643          * If the CPPR is more favored than the new MFRR, then
 644          * nothing needs to be rejected as there can be no XISR to
 645          * reject.  If the MFRR is being made less favored then
 646          * there might be a previously-rejected interrupt needing
 647          * to be resent.
 648          *
 649          * ICP state: Check_IPI
 650          *
 651          * If the CPPR is less favored, then we might be replacing
 652          * an interrupt, and thus need to possibly reject it.
 653          *
 654          * ICP State: IPI
 655          *
 656          * Besides rejecting any pending interrupts, we also
 657          * update XISR and pending_pri to mark IPI as pending.
 658          *
 659          * PAPR does not describe this state, but if the MFRR is being
 660          * made less favored than its earlier value, there might be
 661          * a previously-rejected interrupt needing to be resent.
 662          * Ideally, we would want to resend only if
 663          *      prio(pending_interrupt) < mfrr &&
 664          *      prio(pending_interrupt) < cppr
 665          * where pending interrupt is the one that was rejected. But
 666          * we don't have that state, so we simply trigger a resend
 667          * whenever the MFRR is made less favored.
 668          */
 669         do {
 670                 old_state = new_state = READ_ONCE(icp->state);
 671 
 672                 /* Set_MFRR */
 673                 new_state.mfrr = mfrr;
 674 
 675                 /* Check_IPI */
 676                 reject = 0;
 677                 resend = false;
 678                 if (mfrr < new_state.cppr) {
 679                         /* Reject a pending interrupt if not an IPI */
 680                         if (mfrr <= new_state.pending_pri) {
 681                                 reject = new_state.xisr;
 682                                 new_state.pending_pri = mfrr;
 683                                 new_state.xisr = XICS_IPI;
 684                         }
 685                 }
 686 
 687                 if (mfrr > old_state.mfrr) {
 688                         resend = new_state.need_resend;
 689                         new_state.need_resend = 0;
 690                 }
 691         } while (!icp_try_update(icp, old_state, new_state, local));
 692 
 693         /* Handle reject */
 694         if (reject && reject != XICS_IPI)
 695                 icp_deliver_irq(xics, icp, reject, false);
 696 
 697         /* Handle resend */
 698         if (resend)
 699                 icp_check_resend(xics, icp);
 700 
 701         return H_SUCCESS;
 702 }
 703 
 704 static int kvmppc_h_ipoll(struct kvm_vcpu *vcpu, unsigned long server)
 705 {
 706         union kvmppc_icp_state state;
 707         struct kvmppc_icp *icp;
 708 
 709         icp = vcpu->arch.icp;
 710         if (icp->server_num != server) {
 711                 icp = kvmppc_xics_find_server(vcpu->kvm, server);
 712                 if (!icp)
 713                         return H_PARAMETER;
 714         }
 715         state = READ_ONCE(icp->state);
 716         kvmppc_set_gpr(vcpu, 4, ((u32)state.cppr << 24) | state.xisr);
 717         kvmppc_set_gpr(vcpu, 5, state.mfrr);
 718         return H_SUCCESS;
 719 }
 720 
 721 static noinline void kvmppc_h_cppr(struct kvm_vcpu *vcpu, unsigned long cppr)
 722 {
 723         union kvmppc_icp_state old_state, new_state;
 724         struct kvmppc_xics *xics = vcpu->kvm->arch.xics;
 725         struct kvmppc_icp *icp = vcpu->arch.icp;
 726         u32 reject;
 727 
 728         XICS_DBG("h_cppr vcpu %d cppr %#lx\n", vcpu->vcpu_id, cppr);
 729 
 730         /*
 731          * ICP State: Set_CPPR
 732          *
 733          * We can safely compare the new value with the current
 734          * value outside of the transaction as the CPPR is only
 735          * ever changed by the processor on itself
 736          */
 737         if (cppr > icp->state.cppr)
 738                 icp_down_cppr(xics, icp, cppr);
 739         else if (cppr == icp->state.cppr)
 740                 return;
 741 
 742         /*
 743          * ICP State: Up_CPPR
 744          *
 745          * The processor is raising its priority, this can result
 746          * in a rejection of a pending interrupt:
 747          *
 748          * ICP State: Reject_Current
 749          *
 750          * We can remove EE from the current processor, the update
 751          * transaction will set it again if needed
 752          */
 753         kvmppc_book3s_dequeue_irqprio(icp->vcpu, BOOK3S_INTERRUPT_EXTERNAL);
 754 
 755         do {
 756                 old_state = new_state = READ_ONCE(icp->state);
 757 
 758                 reject = 0;
 759                 new_state.cppr = cppr;
 760 
 761                 if (cppr <= new_state.pending_pri) {
 762                         reject = new_state.xisr;
 763                         new_state.xisr = 0;
 764                         new_state.pending_pri = 0xff;
 765                 }
 766 
 767         } while (!icp_try_update(icp, old_state, new_state, true));
 768 
 769         /*
 770          * Check for rejects. They are handled by doing a new delivery
 771          * attempt (see comments in icp_deliver_irq).
 772          */
 773         if (reject && reject != XICS_IPI)
 774                 icp_deliver_irq(xics, icp, reject, false);
 775 }
 776 
 777 static int ics_eoi(struct kvm_vcpu *vcpu, u32 irq)
 778 {
 779         struct kvmppc_xics *xics = vcpu->kvm->arch.xics;
 780         struct kvmppc_icp *icp = vcpu->arch.icp;
 781         struct kvmppc_ics *ics;
 782         struct ics_irq_state *state;
 783         u16 src;
 784         u32 pq_old, pq_new;
 785 
 786         /*
 787          * ICS EOI handling: For LSI, if P bit is still set, we need to
 788          * resend it.
 789          *
 790          * For MSI, we move Q bit into P (and clear Q). If it is set,
 791          * resend it.
 792          */
 793 
 794         ics = kvmppc_xics_find_ics(xics, irq, &src);
 795         if (!ics) {
 796                 XICS_DBG("ios_eoi: IRQ 0x%06x not found !\n", irq);
 797                 return H_PARAMETER;
 798         }
 799         state = &ics->irq_state[src];
 800 
 801         if (state->lsi)
 802                 pq_new = state->pq_state;
 803         else
 804                 do {
 805                         pq_old = state->pq_state;
 806                         pq_new = pq_old >> 1;
 807                 } while (cmpxchg(&state->pq_state, pq_old, pq_new) != pq_old);
 808 
 809         if (pq_new & PQ_PRESENTED)
 810                 icp_deliver_irq(xics, icp, irq, false);
 811 
 812         kvm_notify_acked_irq(vcpu->kvm, 0, irq);
 813 
 814         return H_SUCCESS;
 815 }
 816 
 817 static noinline int kvmppc_h_eoi(struct kvm_vcpu *vcpu, unsigned long xirr)
 818 {
 819         struct kvmppc_xics *xics = vcpu->kvm->arch.xics;
 820         struct kvmppc_icp *icp = vcpu->arch.icp;
 821         u32 irq = xirr & 0x00ffffff;
 822 
 823         XICS_DBG("h_eoi vcpu %d eoi %#lx\n", vcpu->vcpu_id, xirr);
 824 
 825         /*
 826          * ICP State: EOI
 827          *
 828          * Note: If EOI is incorrectly used by SW to lower the CPPR
 829          * value (ie more favored), we do not check for rejection of
 830          * a pending interrupt, this is a SW error and PAPR specifies
 831          * that we don't have to deal with it.
 832          *
 833          * The sending of an EOI to the ICS is handled after the
 834          * CPPR update
 835          *
 836          * ICP State: Down_CPPR which we handle
 837          * in a separate function as it's shared with H_CPPR.
 838          */
 839         icp_down_cppr(xics, icp, xirr >> 24);
 840 
 841         /* IPIs have no EOI */
 842         if (irq == XICS_IPI)
 843                 return H_SUCCESS;
 844 
 845         return ics_eoi(vcpu, irq);
 846 }
 847 
 848 int kvmppc_xics_rm_complete(struct kvm_vcpu *vcpu, u32 hcall)
 849 {
 850         struct kvmppc_xics *xics = vcpu->kvm->arch.xics;
 851         struct kvmppc_icp *icp = vcpu->arch.icp;
 852 
 853         XICS_DBG("XICS_RM: H_%x completing, act: %x state: %lx tgt: %p\n",
 854                  hcall, icp->rm_action, icp->rm_dbgstate.raw, icp->rm_dbgtgt);
 855 
 856         if (icp->rm_action & XICS_RM_KICK_VCPU) {
 857                 icp->n_rm_kick_vcpu++;
 858                 kvmppc_fast_vcpu_kick(icp->rm_kick_target);
 859         }
 860         if (icp->rm_action & XICS_RM_CHECK_RESEND) {
 861                 icp->n_rm_check_resend++;
 862                 icp_check_resend(xics, icp->rm_resend_icp);
 863         }
 864         if (icp->rm_action & XICS_RM_NOTIFY_EOI) {
 865                 icp->n_rm_notify_eoi++;
 866                 kvm_notify_acked_irq(vcpu->kvm, 0, icp->rm_eoied_irq);
 867         }
 868 
 869         icp->rm_action = 0;
 870 
 871         return H_SUCCESS;
 872 }
 873 EXPORT_SYMBOL_GPL(kvmppc_xics_rm_complete);
 874 
 875 int kvmppc_xics_hcall(struct kvm_vcpu *vcpu, u32 req)
 876 {
 877         struct kvmppc_xics *xics = vcpu->kvm->arch.xics;
 878         unsigned long res;
 879         int rc = H_SUCCESS;
 880 
 881         /* Check if we have an ICP */
 882         if (!xics || !vcpu->arch.icp)
 883                 return H_HARDWARE;
 884 
 885         /* These requests don't have real-mode implementations at present */
 886         switch (req) {
 887         case H_XIRR_X:
 888                 res = kvmppc_h_xirr(vcpu);
 889                 kvmppc_set_gpr(vcpu, 4, res);
 890                 kvmppc_set_gpr(vcpu, 5, get_tb());
 891                 return rc;
 892         case H_IPOLL:
 893                 rc = kvmppc_h_ipoll(vcpu, kvmppc_get_gpr(vcpu, 4));
 894                 return rc;
 895         }
 896 
 897         /* Check for real mode returning too hard */
 898         if (xics->real_mode && is_kvmppc_hv_enabled(vcpu->kvm))
 899                 return kvmppc_xics_rm_complete(vcpu, req);
 900 
 901         switch (req) {
 902         case H_XIRR:
 903                 res = kvmppc_h_xirr(vcpu);
 904                 kvmppc_set_gpr(vcpu, 4, res);
 905                 break;
 906         case H_CPPR:
 907                 kvmppc_h_cppr(vcpu, kvmppc_get_gpr(vcpu, 4));
 908                 break;
 909         case H_EOI:
 910                 rc = kvmppc_h_eoi(vcpu, kvmppc_get_gpr(vcpu, 4));
 911                 break;
 912         case H_IPI:
 913                 rc = kvmppc_h_ipi(vcpu, kvmppc_get_gpr(vcpu, 4),
 914                                   kvmppc_get_gpr(vcpu, 5));
 915                 break;
 916         }
 917 
 918         return rc;
 919 }
 920 EXPORT_SYMBOL_GPL(kvmppc_xics_hcall);
 921 
 922 
 923 /* -- Initialisation code etc. -- */
 924 
 925 static void xics_debugfs_irqmap(struct seq_file *m,
 926                                 struct kvmppc_passthru_irqmap *pimap)
 927 {
 928         int i;
 929 
 930         if (!pimap)
 931                 return;
 932         seq_printf(m, "========\nPIRQ mappings: %d maps\n===========\n",
 933                                 pimap->n_mapped);
 934         for (i = 0; i < pimap->n_mapped; i++)  {
 935                 seq_printf(m, "r_hwirq=%x, v_hwirq=%x\n",
 936                         pimap->mapped[i].r_hwirq, pimap->mapped[i].v_hwirq);
 937         }
 938 }
 939 
 940 static int xics_debug_show(struct seq_file *m, void *private)
 941 {
 942         struct kvmppc_xics *xics = m->private;
 943         struct kvm *kvm = xics->kvm;
 944         struct kvm_vcpu *vcpu;
 945         int icsid, i;
 946         unsigned long flags;
 947         unsigned long t_rm_kick_vcpu, t_rm_check_resend;
 948         unsigned long t_rm_notify_eoi;
 949         unsigned long t_reject, t_check_resend;
 950 
 951         if (!kvm)
 952                 return 0;
 953 
 954         t_rm_kick_vcpu = 0;
 955         t_rm_notify_eoi = 0;
 956         t_rm_check_resend = 0;
 957         t_check_resend = 0;
 958         t_reject = 0;
 959 
 960         xics_debugfs_irqmap(m, kvm->arch.pimap);
 961 
 962         seq_printf(m, "=========\nICP state\n=========\n");
 963 
 964         kvm_for_each_vcpu(i, vcpu, kvm) {
 965                 struct kvmppc_icp *icp = vcpu->arch.icp;
 966                 union kvmppc_icp_state state;
 967 
 968                 if (!icp)
 969                         continue;
 970 
 971                 state.raw = READ_ONCE(icp->state.raw);
 972                 seq_printf(m, "cpu server %#lx XIRR:%#x PPRI:%#x CPPR:%#x MFRR:%#x OUT:%d NR:%d\n",
 973                            icp->server_num, state.xisr,
 974                            state.pending_pri, state.cppr, state.mfrr,
 975                            state.out_ee, state.need_resend);
 976                 t_rm_kick_vcpu += icp->n_rm_kick_vcpu;
 977                 t_rm_notify_eoi += icp->n_rm_notify_eoi;
 978                 t_rm_check_resend += icp->n_rm_check_resend;
 979                 t_check_resend += icp->n_check_resend;
 980                 t_reject += icp->n_reject;
 981         }
 982 
 983         seq_printf(m, "ICP Guest->Host totals: kick_vcpu=%lu check_resend=%lu notify_eoi=%lu\n",
 984                         t_rm_kick_vcpu, t_rm_check_resend,
 985                         t_rm_notify_eoi);
 986         seq_printf(m, "ICP Real Mode totals: check_resend=%lu resend=%lu\n",
 987                         t_check_resend, t_reject);
 988         for (icsid = 0; icsid <= KVMPPC_XICS_MAX_ICS_ID; icsid++) {
 989                 struct kvmppc_ics *ics = xics->ics[icsid];
 990 
 991                 if (!ics)
 992                         continue;
 993 
 994                 seq_printf(m, "=========\nICS state for ICS 0x%x\n=========\n",
 995                            icsid);
 996 
 997                 local_irq_save(flags);
 998                 arch_spin_lock(&ics->lock);
 999 
1000                 for (i = 0; i < KVMPPC_XICS_IRQ_PER_ICS; i++) {
1001                         struct ics_irq_state *irq = &ics->irq_state[i];
1002 
1003                         seq_printf(m, "irq 0x%06x: server %#x prio %#x save prio %#x pq_state %d resend %d masked pending %d\n",
1004                                    irq->number, irq->server, irq->priority,
1005                                    irq->saved_priority, irq->pq_state,
1006                                    irq->resend, irq->masked_pending);
1007 
1008                 }
1009                 arch_spin_unlock(&ics->lock);
1010                 local_irq_restore(flags);
1011         }
1012         return 0;
1013 }
1014 
1015 DEFINE_SHOW_ATTRIBUTE(xics_debug);
1016 
1017 static void xics_debugfs_init(struct kvmppc_xics *xics)
1018 {
1019         char *name;
1020 
1021         name = kasprintf(GFP_KERNEL, "kvm-xics-%p", xics);
1022         if (!name) {
1023                 pr_err("%s: no memory for name\n", __func__);
1024                 return;
1025         }
1026 
1027         xics->dentry = debugfs_create_file(name, 0444, powerpc_debugfs_root,
1028                                            xics, &xics_debug_fops);
1029 
1030         pr_debug("%s: created %s\n", __func__, name);
1031         kfree(name);
1032 }
1033 
1034 static struct kvmppc_ics *kvmppc_xics_create_ics(struct kvm *kvm,
1035                                         struct kvmppc_xics *xics, int irq)
1036 {
1037         struct kvmppc_ics *ics;
1038         int i, icsid;
1039 
1040         icsid = irq >> KVMPPC_XICS_ICS_SHIFT;
1041 
1042         mutex_lock(&kvm->lock);
1043 
1044         /* ICS already exists - somebody else got here first */
1045         if (xics->ics[icsid])
1046                 goto out;
1047 
1048         /* Create the ICS */
1049         ics = kzalloc(sizeof(struct kvmppc_ics), GFP_KERNEL);
1050         if (!ics)
1051                 goto out;
1052 
1053         ics->icsid = icsid;
1054 
1055         for (i = 0; i < KVMPPC_XICS_IRQ_PER_ICS; i++) {
1056                 ics->irq_state[i].number = (icsid << KVMPPC_XICS_ICS_SHIFT) | i;
1057                 ics->irq_state[i].priority = MASKED;
1058                 ics->irq_state[i].saved_priority = MASKED;
1059         }
1060         smp_wmb();
1061         xics->ics[icsid] = ics;
1062 
1063         if (icsid > xics->max_icsid)
1064                 xics->max_icsid = icsid;
1065 
1066  out:
1067         mutex_unlock(&kvm->lock);
1068         return xics->ics[icsid];
1069 }
1070 
1071 static int kvmppc_xics_create_icp(struct kvm_vcpu *vcpu, unsigned long server_num)
1072 {
1073         struct kvmppc_icp *icp;
1074 
1075         if (!vcpu->kvm->arch.xics)
1076                 return -ENODEV;
1077 
1078         if (kvmppc_xics_find_server(vcpu->kvm, server_num))
1079                 return -EEXIST;
1080 
1081         icp = kzalloc(sizeof(struct kvmppc_icp), GFP_KERNEL);
1082         if (!icp)
1083                 return -ENOMEM;
1084 
1085         icp->vcpu = vcpu;
1086         icp->server_num = server_num;
1087         icp->state.mfrr = MASKED;
1088         icp->state.pending_pri = MASKED;
1089         vcpu->arch.icp = icp;
1090 
1091         XICS_DBG("created server for vcpu %d\n", vcpu->vcpu_id);
1092 
1093         return 0;
1094 }
1095 
1096 u64 kvmppc_xics_get_icp(struct kvm_vcpu *vcpu)
1097 {
1098         struct kvmppc_icp *icp = vcpu->arch.icp;
1099         union kvmppc_icp_state state;
1100 
1101         if (!icp)
1102                 return 0;
1103         state = icp->state;
1104         return ((u64)state.cppr << KVM_REG_PPC_ICP_CPPR_SHIFT) |
1105                 ((u64)state.xisr << KVM_REG_PPC_ICP_XISR_SHIFT) |
1106                 ((u64)state.mfrr << KVM_REG_PPC_ICP_MFRR_SHIFT) |
1107                 ((u64)state.pending_pri << KVM_REG_PPC_ICP_PPRI_SHIFT);
1108 }
1109 
1110 int kvmppc_xics_set_icp(struct kvm_vcpu *vcpu, u64 icpval)
1111 {
1112         struct kvmppc_icp *icp = vcpu->arch.icp;
1113         struct kvmppc_xics *xics = vcpu->kvm->arch.xics;
1114         union kvmppc_icp_state old_state, new_state;
1115         struct kvmppc_ics *ics;
1116         u8 cppr, mfrr, pending_pri;
1117         u32 xisr;
1118         u16 src;
1119         bool resend;
1120 
1121         if (!icp || !xics)
1122                 return -ENOENT;
1123 
1124         cppr = icpval >> KVM_REG_PPC_ICP_CPPR_SHIFT;
1125         xisr = (icpval >> KVM_REG_PPC_ICP_XISR_SHIFT) &
1126                 KVM_REG_PPC_ICP_XISR_MASK;
1127         mfrr = icpval >> KVM_REG_PPC_ICP_MFRR_SHIFT;
1128         pending_pri = icpval >> KVM_REG_PPC_ICP_PPRI_SHIFT;
1129 
1130         /* Require the new state to be internally consistent */
1131         if (xisr == 0) {
1132                 if (pending_pri != 0xff)
1133                         return -EINVAL;
1134         } else if (xisr == XICS_IPI) {
1135                 if (pending_pri != mfrr || pending_pri >= cppr)
1136                         return -EINVAL;
1137         } else {
1138                 if (pending_pri >= mfrr || pending_pri >= cppr)
1139                         return -EINVAL;
1140                 ics = kvmppc_xics_find_ics(xics, xisr, &src);
1141                 if (!ics)
1142                         return -EINVAL;
1143         }
1144 
1145         new_state.raw = 0;
1146         new_state.cppr = cppr;
1147         new_state.xisr = xisr;
1148         new_state.mfrr = mfrr;
1149         new_state.pending_pri = pending_pri;
1150 
1151         /*
1152          * Deassert the CPU interrupt request.
1153          * icp_try_update will reassert it if necessary.
1154          */
1155         kvmppc_book3s_dequeue_irqprio(icp->vcpu, BOOK3S_INTERRUPT_EXTERNAL);
1156 
1157         /*
1158          * Note that if we displace an interrupt from old_state.xisr,
1159          * we don't mark it as rejected.  We expect userspace to set
1160          * the state of the interrupt sources to be consistent with
1161          * the ICP states (either before or afterwards, which doesn't
1162          * matter).  We do handle resends due to CPPR becoming less
1163          * favoured because that is necessary to end up with a
1164          * consistent state in the situation where userspace restores
1165          * the ICS states before the ICP states.
1166          */
1167         do {
1168                 old_state = READ_ONCE(icp->state);
1169 
1170                 if (new_state.mfrr <= old_state.mfrr) {
1171                         resend = false;
1172                         new_state.need_resend = old_state.need_resend;
1173                 } else {
1174                         resend = old_state.need_resend;
1175                         new_state.need_resend = 0;
1176                 }
1177         } while (!icp_try_update(icp, old_state, new_state, false));
1178 
1179         if (resend)
1180                 icp_check_resend(xics, icp);
1181 
1182         return 0;
1183 }
1184 
1185 static int xics_get_source(struct kvmppc_xics *xics, long irq, u64 addr)
1186 {
1187         int ret;
1188         struct kvmppc_ics *ics;
1189         struct ics_irq_state *irqp;
1190         u64 __user *ubufp = (u64 __user *) addr;
1191         u16 idx;
1192         u64 val, prio;
1193         unsigned long flags;
1194 
1195         ics = kvmppc_xics_find_ics(xics, irq, &idx);
1196         if (!ics)
1197                 return -ENOENT;
1198 
1199         irqp = &ics->irq_state[idx];
1200         local_irq_save(flags);
1201         arch_spin_lock(&ics->lock);
1202         ret = -ENOENT;
1203         if (irqp->exists) {
1204                 val = irqp->server;
1205                 prio = irqp->priority;
1206                 if (prio == MASKED) {
1207                         val |= KVM_XICS_MASKED;
1208                         prio = irqp->saved_priority;
1209                 }
1210                 val |= prio << KVM_XICS_PRIORITY_SHIFT;
1211                 if (irqp->lsi) {
1212                         val |= KVM_XICS_LEVEL_SENSITIVE;
1213                         if (irqp->pq_state & PQ_PRESENTED)
1214                                 val |= KVM_XICS_PENDING;
1215                 } else if (irqp->masked_pending || irqp->resend)
1216                         val |= KVM_XICS_PENDING;
1217 
1218                 if (irqp->pq_state & PQ_PRESENTED)
1219                         val |= KVM_XICS_PRESENTED;
1220 
1221                 if (irqp->pq_state & PQ_QUEUED)
1222                         val |= KVM_XICS_QUEUED;
1223 
1224                 ret = 0;
1225         }
1226         arch_spin_unlock(&ics->lock);
1227         local_irq_restore(flags);
1228 
1229         if (!ret && put_user(val, ubufp))
1230                 ret = -EFAULT;
1231 
1232         return ret;
1233 }
1234 
1235 static int xics_set_source(struct kvmppc_xics *xics, long irq, u64 addr)
1236 {
1237         struct kvmppc_ics *ics;
1238         struct ics_irq_state *irqp;
1239         u64 __user *ubufp = (u64 __user *) addr;
1240         u16 idx;
1241         u64 val;
1242         u8 prio;
1243         u32 server;
1244         unsigned long flags;
1245 
1246         if (irq < KVMPPC_XICS_FIRST_IRQ || irq >= KVMPPC_XICS_NR_IRQS)
1247                 return -ENOENT;
1248 
1249         ics = kvmppc_xics_find_ics(xics, irq, &idx);
1250         if (!ics) {
1251                 ics = kvmppc_xics_create_ics(xics->kvm, xics, irq);
1252                 if (!ics)
1253                         return -ENOMEM;
1254         }
1255         irqp = &ics->irq_state[idx];
1256         if (get_user(val, ubufp))
1257                 return -EFAULT;
1258 
1259         server = val & KVM_XICS_DESTINATION_MASK;
1260         prio = val >> KVM_XICS_PRIORITY_SHIFT;
1261         if (prio != MASKED &&
1262             kvmppc_xics_find_server(xics->kvm, server) == NULL)
1263                 return -EINVAL;
1264 
1265         local_irq_save(flags);
1266         arch_spin_lock(&ics->lock);
1267         irqp->server = server;
1268         irqp->saved_priority = prio;
1269         if (val & KVM_XICS_MASKED)
1270                 prio = MASKED;
1271         irqp->priority = prio;
1272         irqp->resend = 0;
1273         irqp->masked_pending = 0;
1274         irqp->lsi = 0;
1275         irqp->pq_state = 0;
1276         if (val & KVM_XICS_LEVEL_SENSITIVE)
1277                 irqp->lsi = 1;
1278         /* If PENDING, set P in case P is not saved because of old code */
1279         if (val & KVM_XICS_PRESENTED || val & KVM_XICS_PENDING)
1280                 irqp->pq_state |= PQ_PRESENTED;
1281         if (val & KVM_XICS_QUEUED)
1282                 irqp->pq_state |= PQ_QUEUED;
1283         irqp->exists = 1;
1284         arch_spin_unlock(&ics->lock);
1285         local_irq_restore(flags);
1286 
1287         if (val & KVM_XICS_PENDING)
1288                 icp_deliver_irq(xics, NULL, irqp->number, false);
1289 
1290         return 0;
1291 }
1292 
1293 int kvmppc_xics_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level,
1294                         bool line_status)
1295 {
1296         struct kvmppc_xics *xics = kvm->arch.xics;
1297 
1298         if (!xics)
1299                 return -ENODEV;
1300         return ics_deliver_irq(xics, irq, level);
1301 }
1302 
1303 static int xics_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1304 {
1305         struct kvmppc_xics *xics = dev->private;
1306 
1307         switch (attr->group) {
1308         case KVM_DEV_XICS_GRP_SOURCES:
1309                 return xics_set_source(xics, attr->attr, attr->addr);
1310         }
1311         return -ENXIO;
1312 }
1313 
1314 static int xics_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1315 {
1316         struct kvmppc_xics *xics = dev->private;
1317 
1318         switch (attr->group) {
1319         case KVM_DEV_XICS_GRP_SOURCES:
1320                 return xics_get_source(xics, attr->attr, attr->addr);
1321         }
1322         return -ENXIO;
1323 }
1324 
1325 static int xics_has_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1326 {
1327         switch (attr->group) {
1328         case KVM_DEV_XICS_GRP_SOURCES:
1329                 if (attr->attr >= KVMPPC_XICS_FIRST_IRQ &&
1330                     attr->attr < KVMPPC_XICS_NR_IRQS)
1331                         return 0;
1332                 break;
1333         }
1334         return -ENXIO;
1335 }
1336 
1337 static void kvmppc_xics_free(struct kvm_device *dev)
1338 {
1339         struct kvmppc_xics *xics = dev->private;
1340         int i;
1341         struct kvm *kvm = xics->kvm;
1342 
1343         debugfs_remove(xics->dentry);
1344 
1345         if (kvm)
1346                 kvm->arch.xics = NULL;
1347 
1348         for (i = 0; i <= xics->max_icsid; i++)
1349                 kfree(xics->ics[i]);
1350         kfree(xics);
1351         kfree(dev);
1352 }
1353 
1354 static int kvmppc_xics_create(struct kvm_device *dev, u32 type)
1355 {
1356         struct kvmppc_xics *xics;
1357         struct kvm *kvm = dev->kvm;
1358         int ret = 0;
1359 
1360         xics = kzalloc(sizeof(*xics), GFP_KERNEL);
1361         if (!xics)
1362                 return -ENOMEM;
1363 
1364         dev->private = xics;
1365         xics->dev = dev;
1366         xics->kvm = kvm;
1367 
1368         /* Already there ? */
1369         if (kvm->arch.xics)
1370                 ret = -EEXIST;
1371         else
1372                 kvm->arch.xics = xics;
1373 
1374         if (ret) {
1375                 kfree(xics);
1376                 return ret;
1377         }
1378 
1379 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
1380         if (cpu_has_feature(CPU_FTR_ARCH_206) &&
1381             cpu_has_feature(CPU_FTR_HVMODE)) {
1382                 /* Enable real mode support */
1383                 xics->real_mode = ENABLE_REALMODE;
1384                 xics->real_mode_dbg = DEBUG_REALMODE;
1385         }
1386 #endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */
1387 
1388         return 0;
1389 }
1390 
1391 static void kvmppc_xics_init(struct kvm_device *dev)
1392 {
1393         struct kvmppc_xics *xics = (struct kvmppc_xics *)dev->private;
1394 
1395         xics_debugfs_init(xics);
1396 }
1397 
1398 struct kvm_device_ops kvm_xics_ops = {
1399         .name = "kvm-xics",
1400         .create = kvmppc_xics_create,
1401         .init = kvmppc_xics_init,
1402         .destroy = kvmppc_xics_free,
1403         .set_attr = xics_set_attr,
1404         .get_attr = xics_get_attr,
1405         .has_attr = xics_has_attr,
1406 };
1407 
1408 int kvmppc_xics_connect_vcpu(struct kvm_device *dev, struct kvm_vcpu *vcpu,
1409                              u32 xcpu)
1410 {
1411         struct kvmppc_xics *xics = dev->private;
1412         int r = -EBUSY;
1413 
1414         if (dev->ops != &kvm_xics_ops)
1415                 return -EPERM;
1416         if (xics->kvm != vcpu->kvm)
1417                 return -EPERM;
1418         if (vcpu->arch.irq_type)
1419                 return -EBUSY;
1420 
1421         r = kvmppc_xics_create_icp(vcpu, xcpu);
1422         if (!r)
1423                 vcpu->arch.irq_type = KVMPPC_IRQ_XICS;
1424 
1425         return r;
1426 }
1427 
1428 void kvmppc_xics_free_icp(struct kvm_vcpu *vcpu)
1429 {
1430         if (!vcpu->arch.icp)
1431                 return;
1432         kfree(vcpu->arch.icp);
1433         vcpu->arch.icp = NULL;
1434         vcpu->arch.irq_type = KVMPPC_IRQ_DEFAULT;
1435 }
1436 
1437 void kvmppc_xics_set_mapped(struct kvm *kvm, unsigned long irq,
1438                             unsigned long host_irq)
1439 {
1440         struct kvmppc_xics *xics = kvm->arch.xics;
1441         struct kvmppc_ics *ics;
1442         u16 idx;
1443 
1444         ics = kvmppc_xics_find_ics(xics, irq, &idx);
1445         if (!ics)
1446                 return;
1447 
1448         ics->irq_state[idx].host_irq = host_irq;
1449         ics->irq_state[idx].intr_cpu = -1;
1450 }
1451 EXPORT_SYMBOL_GPL(kvmppc_xics_set_mapped);
1452 
1453 void kvmppc_xics_clr_mapped(struct kvm *kvm, unsigned long irq,
1454                             unsigned long host_irq)
1455 {
1456         struct kvmppc_xics *xics = kvm->arch.xics;
1457         struct kvmppc_ics *ics;
1458         u16 idx;
1459 
1460         ics = kvmppc_xics_find_ics(xics, irq, &idx);
1461         if (!ics)
1462                 return;
1463 
1464         ics->irq_state[idx].host_irq = 0;
1465 }
1466 EXPORT_SYMBOL_GPL(kvmppc_xics_clr_mapped);
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root/arch/powerpc/kvm/book3s_xics.c

DEFINITIONS
