2 * Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
3 * Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved.
6 * Paul Mackerras <paulus@au1.ibm.com>
7 * Alexander Graf <agraf@suse.de>
8 * Kevin Wolf <mail@kevin-wolf.de>
10 * Description: KVM functions specific to running on Book 3S
11 * processors in hypervisor mode (specifically POWER7 and later).
13 * This file is derived from arch/powerpc/kvm/book3s.c,
14 * by Alexander Graf <agraf@suse.de>.
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License, version 2, as
18 * published by the Free Software Foundation.
21 #include <linux/kvm_host.h>
22 #include <linux/err.h>
23 #include <linux/slab.h>
24 #include <linux/preempt.h>
25 #include <linux/sched.h>
26 #include <linux/delay.h>
27 #include <linux/export.h>
29 #include <linux/anon_inodes.h>
30 #include <linux/cpumask.h>
31 #include <linux/spinlock.h>
32 #include <linux/page-flags.h>
33 #include <linux/srcu.h>
34 #include <linux/miscdevice.h>
35 #include <linux/debugfs.h>
38 #include <asm/cputable.h>
39 #include <asm/cache.h>
40 #include <asm/cacheflush.h>
41 #include <asm/tlbflush.h>
42 #include <asm/uaccess.h>
44 #include <asm/kvm_ppc.h>
45 #include <asm/kvm_book3s.h>
46 #include <asm/mmu_context.h>
47 #include <asm/lppaca.h>
48 #include <asm/processor.h>
49 #include <asm/cputhreads.h>
51 #include <asm/hvcall.h>
52 #include <asm/switch_to.h>
54 #include <asm/dbell.h>
55 #include <linux/gfp.h>
56 #include <linux/vmalloc.h>
57 #include <linux/highmem.h>
58 #include <linux/hugetlb.h>
59 #include <linux/module.h>
63 #define CREATE_TRACE_POINTS
66 /* #define EXIT_DEBUG */
67 /* #define EXIT_DEBUG_SIMPLE */
68 /* #define EXIT_DEBUG_INT */
70 /* Used to indicate that a guest page fault needs to be handled */
71 #define RESUME_PAGE_FAULT (RESUME_GUEST | RESUME_FLAG_ARCH1)
73 /* Used as a "null" value for timebase values */
74 #define TB_NIL (~(u64)0)
76 static DECLARE_BITMAP(default_enabled_hcalls, MAX_HCALL_OPCODE/4 + 1);
78 #if defined(CONFIG_PPC_64K_PAGES)
79 #define MPP_BUFFER_ORDER 0
80 #elif defined(CONFIG_PPC_4K_PAGES)
81 #define MPP_BUFFER_ORDER 3
84 static int dynamic_mt_modes = 6;
85 module_param(dynamic_mt_modes, int, S_IRUGO | S_IWUSR);
86 MODULE_PARM_DESC(dynamic_mt_modes, "Set of allowed dynamic micro-threading modes: 0 (= none), 2, 4, or 6 (= 2 or 4)");
87 static int target_smt_mode;
88 module_param(target_smt_mode, int, S_IRUGO | S_IWUSR);
89 MODULE_PARM_DESC(target_smt_mode, "Target threads per core (0 = max)");
91 static void kvmppc_end_cede(struct kvm_vcpu *vcpu);
92 static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu);
94 static bool kvmppc_ipi_thread(int cpu)
96 /* On POWER8 for IPIs to threads in the same core, use msgsnd */
97 if (cpu_has_feature(CPU_FTR_ARCH_207S)) {
99 if (cpu_first_thread_sibling(cpu) ==
100 cpu_first_thread_sibling(smp_processor_id())) {
101 unsigned long msg = PPC_DBELL_TYPE(PPC_DBELL_SERVER);
102 msg |= cpu_thread_in_core(cpu);
104 __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
111 #if defined(CONFIG_PPC_ICP_NATIVE) && defined(CONFIG_SMP)
112 if (cpu >= 0 && cpu < nr_cpu_ids && paca[cpu].kvm_hstate.xics_phys) {
121 static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
124 wait_queue_head_t *wqp;
126 wqp = kvm_arch_vcpu_wq(vcpu);
127 if (waitqueue_active(wqp)) {
128 wake_up_interruptible(wqp);
129 ++vcpu->stat.halt_wakeup;
132 if (kvmppc_ipi_thread(vcpu->arch.thread_cpu))
135 /* CPU points to the first thread of the core */
137 if (cpu >= 0 && cpu < nr_cpu_ids && cpu_online(cpu))
138 smp_send_reschedule(cpu);
142 * We use the vcpu_load/put functions to measure stolen time.
143 * Stolen time is counted as time when either the vcpu is able to
144 * run as part of a virtual core, but the task running the vcore
145 * is preempted or sleeping, or when the vcpu needs something done
146 * in the kernel by the task running the vcpu, but that task is
147 * preempted or sleeping. Those two things have to be counted
148 * separately, since one of the vcpu tasks will take on the job
149 * of running the core, and the other vcpu tasks in the vcore will
150 * sleep waiting for it to do that, but that sleep shouldn't count
153 * Hence we accumulate stolen time when the vcpu can run as part of
154 * a vcore using vc->stolen_tb, and the stolen time when the vcpu
155 * needs its task to do other things in the kernel (for example,
156 * service a page fault) in busy_stolen. We don't accumulate
157 * stolen time for a vcore when it is inactive, or for a vcpu
158 * when it is in state RUNNING or NOTREADY. NOTREADY is a bit of
159 * a misnomer; it means that the vcpu task is not executing in
160 * the KVM_VCPU_RUN ioctl, i.e. it is in userspace or elsewhere in
161 * the kernel. We don't have any way of dividing up that time
162 * between time that the vcpu is genuinely stopped, time that
163 * the task is actively working on behalf of the vcpu, and time
164 * that the task is preempted, so we don't count any of it as
167 * Updates to busy_stolen are protected by arch.tbacct_lock;
168 * updates to vc->stolen_tb are protected by the vcore->stoltb_lock
169 * lock. The stolen times are measured in units of timebase ticks.
170 * (Note that the != TB_NIL checks below are purely defensive;
171 * they should never fail.)
174 static void kvmppc_core_start_stolen(struct kvmppc_vcore *vc)
178 spin_lock_irqsave(&vc->stoltb_lock, flags);
179 vc->preempt_tb = mftb();
180 spin_unlock_irqrestore(&vc->stoltb_lock, flags);
183 static void kvmppc_core_end_stolen(struct kvmppc_vcore *vc)
187 spin_lock_irqsave(&vc->stoltb_lock, flags);
188 if (vc->preempt_tb != TB_NIL) {
189 vc->stolen_tb += mftb() - vc->preempt_tb;
190 vc->preempt_tb = TB_NIL;
192 spin_unlock_irqrestore(&vc->stoltb_lock, flags);
195 static void kvmppc_core_vcpu_load_hv(struct kvm_vcpu *vcpu, int cpu)
197 struct kvmppc_vcore *vc = vcpu->arch.vcore;
201 * We can test vc->runner without taking the vcore lock,
202 * because only this task ever sets vc->runner to this
203 * vcpu, and once it is set to this vcpu, only this task
204 * ever sets it to NULL.
206 if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING)
207 kvmppc_core_end_stolen(vc);
209 spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
210 if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST &&
211 vcpu->arch.busy_preempt != TB_NIL) {
212 vcpu->arch.busy_stolen += mftb() - vcpu->arch.busy_preempt;
213 vcpu->arch.busy_preempt = TB_NIL;
215 spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
218 static void kvmppc_core_vcpu_put_hv(struct kvm_vcpu *vcpu)
220 struct kvmppc_vcore *vc = vcpu->arch.vcore;
223 if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING)
224 kvmppc_core_start_stolen(vc);
226 spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
227 if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST)
228 vcpu->arch.busy_preempt = mftb();
229 spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
232 static void kvmppc_set_msr_hv(struct kvm_vcpu *vcpu, u64 msr)
234 vcpu->arch.shregs.msr = msr;
235 kvmppc_end_cede(vcpu);
238 static void kvmppc_set_pvr_hv(struct kvm_vcpu *vcpu, u32 pvr)
240 vcpu->arch.pvr = pvr;
243 static int kvmppc_set_arch_compat(struct kvm_vcpu *vcpu, u32 arch_compat)
245 unsigned long pcr = 0;
246 struct kvmppc_vcore *vc = vcpu->arch.vcore;
249 switch (arch_compat) {
252 * If an arch bit is set in PCR, all the defined
253 * higher-order arch bits also have to be set.
255 pcr = PCR_ARCH_206 | PCR_ARCH_205;
267 if (!cpu_has_feature(CPU_FTR_ARCH_207S)) {
268 /* POWER7 can't emulate POWER8 */
269 if (!(pcr & PCR_ARCH_206))
271 pcr &= ~PCR_ARCH_206;
275 spin_lock(&vc->lock);
276 vc->arch_compat = arch_compat;
278 spin_unlock(&vc->lock);
283 static void kvmppc_dump_regs(struct kvm_vcpu *vcpu)
287 pr_err("vcpu %p (%d):\n", vcpu, vcpu->vcpu_id);
288 pr_err("pc = %.16lx msr = %.16llx trap = %x\n",
289 vcpu->arch.pc, vcpu->arch.shregs.msr, vcpu->arch.trap);
290 for (r = 0; r < 16; ++r)
291 pr_err("r%2d = %.16lx r%d = %.16lx\n",
292 r, kvmppc_get_gpr(vcpu, r),
293 r+16, kvmppc_get_gpr(vcpu, r+16));
294 pr_err("ctr = %.16lx lr = %.16lx\n",
295 vcpu->arch.ctr, vcpu->arch.lr);
296 pr_err("srr0 = %.16llx srr1 = %.16llx\n",
297 vcpu->arch.shregs.srr0, vcpu->arch.shregs.srr1);
298 pr_err("sprg0 = %.16llx sprg1 = %.16llx\n",
299 vcpu->arch.shregs.sprg0, vcpu->arch.shregs.sprg1);
300 pr_err("sprg2 = %.16llx sprg3 = %.16llx\n",
301 vcpu->arch.shregs.sprg2, vcpu->arch.shregs.sprg3);
302 pr_err("cr = %.8x xer = %.16lx dsisr = %.8x\n",
303 vcpu->arch.cr, vcpu->arch.xer, vcpu->arch.shregs.dsisr);
304 pr_err("dar = %.16llx\n", vcpu->arch.shregs.dar);
305 pr_err("fault dar = %.16lx dsisr = %.8x\n",
306 vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
307 pr_err("SLB (%d entries):\n", vcpu->arch.slb_max);
308 for (r = 0; r < vcpu->arch.slb_max; ++r)
309 pr_err(" ESID = %.16llx VSID = %.16llx\n",
310 vcpu->arch.slb[r].orige, vcpu->arch.slb[r].origv);
311 pr_err("lpcr = %.16lx sdr1 = %.16lx last_inst = %.8x\n",
312 vcpu->arch.vcore->lpcr, vcpu->kvm->arch.sdr1,
313 vcpu->arch.last_inst);
316 static struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id)
319 struct kvm_vcpu *v, *ret = NULL;
321 mutex_lock(&kvm->lock);
322 kvm_for_each_vcpu(r, v, kvm) {
323 if (v->vcpu_id == id) {
328 mutex_unlock(&kvm->lock);
332 static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa)
334 vpa->__old_status |= LPPACA_OLD_SHARED_PROC;
335 vpa->yield_count = cpu_to_be32(1);
338 static int set_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *v,
339 unsigned long addr, unsigned long len)
341 /* check address is cacheline aligned */
342 if (addr & (L1_CACHE_BYTES - 1))
344 spin_lock(&vcpu->arch.vpa_update_lock);
345 if (v->next_gpa != addr || v->len != len) {
347 v->len = addr ? len : 0;
348 v->update_pending = 1;
350 spin_unlock(&vcpu->arch.vpa_update_lock);
354 /* Length for a per-processor buffer is passed in at offset 4 in the buffer */
363 static int vpa_is_registered(struct kvmppc_vpa *vpap)
365 if (vpap->update_pending)
366 return vpap->next_gpa != 0;
367 return vpap->pinned_addr != NULL;
370 static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu,
372 unsigned long vcpuid, unsigned long vpa)
374 struct kvm *kvm = vcpu->kvm;
375 unsigned long len, nb;
377 struct kvm_vcpu *tvcpu;
380 struct kvmppc_vpa *vpap;
382 tvcpu = kvmppc_find_vcpu(kvm, vcpuid);
386 subfunc = (flags >> H_VPA_FUNC_SHIFT) & H_VPA_FUNC_MASK;
387 if (subfunc == H_VPA_REG_VPA || subfunc == H_VPA_REG_DTL ||
388 subfunc == H_VPA_REG_SLB) {
389 /* Registering new area - address must be cache-line aligned */
390 if ((vpa & (L1_CACHE_BYTES - 1)) || !vpa)
393 /* convert logical addr to kernel addr and read length */
394 va = kvmppc_pin_guest_page(kvm, vpa, &nb);
397 if (subfunc == H_VPA_REG_VPA)
398 len = be16_to_cpu(((struct reg_vpa *)va)->length.hword);
400 len = be32_to_cpu(((struct reg_vpa *)va)->length.word);
401 kvmppc_unpin_guest_page(kvm, va, vpa, false);
404 if (len > nb || len < sizeof(struct reg_vpa))
413 spin_lock(&tvcpu->arch.vpa_update_lock);
416 case H_VPA_REG_VPA: /* register VPA */
417 if (len < sizeof(struct lppaca))
419 vpap = &tvcpu->arch.vpa;
423 case H_VPA_REG_DTL: /* register DTL */
424 if (len < sizeof(struct dtl_entry))
426 len -= len % sizeof(struct dtl_entry);
428 /* Check that they have previously registered a VPA */
430 if (!vpa_is_registered(&tvcpu->arch.vpa))
433 vpap = &tvcpu->arch.dtl;
437 case H_VPA_REG_SLB: /* register SLB shadow buffer */
438 /* Check that they have previously registered a VPA */
440 if (!vpa_is_registered(&tvcpu->arch.vpa))
443 vpap = &tvcpu->arch.slb_shadow;
447 case H_VPA_DEREG_VPA: /* deregister VPA */
448 /* Check they don't still have a DTL or SLB buf registered */
450 if (vpa_is_registered(&tvcpu->arch.dtl) ||
451 vpa_is_registered(&tvcpu->arch.slb_shadow))
454 vpap = &tvcpu->arch.vpa;
458 case H_VPA_DEREG_DTL: /* deregister DTL */
459 vpap = &tvcpu->arch.dtl;
463 case H_VPA_DEREG_SLB: /* deregister SLB shadow buffer */
464 vpap = &tvcpu->arch.slb_shadow;
470 vpap->next_gpa = vpa;
472 vpap->update_pending = 1;
475 spin_unlock(&tvcpu->arch.vpa_update_lock);
480 static void kvmppc_update_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *vpap)
482 struct kvm *kvm = vcpu->kvm;
488 * We need to pin the page pointed to by vpap->next_gpa,
489 * but we can't call kvmppc_pin_guest_page under the lock
490 * as it does get_user_pages() and down_read(). So we
491 * have to drop the lock, pin the page, then get the lock
492 * again and check that a new area didn't get registered
496 gpa = vpap->next_gpa;
497 spin_unlock(&vcpu->arch.vpa_update_lock);
501 va = kvmppc_pin_guest_page(kvm, gpa, &nb);
502 spin_lock(&vcpu->arch.vpa_update_lock);
503 if (gpa == vpap->next_gpa)
505 /* sigh... unpin that one and try again */
507 kvmppc_unpin_guest_page(kvm, va, gpa, false);
510 vpap->update_pending = 0;
511 if (va && nb < vpap->len) {
513 * If it's now too short, it must be that userspace
514 * has changed the mappings underlying guest memory,
515 * so unregister the region.
517 kvmppc_unpin_guest_page(kvm, va, gpa, false);
520 if (vpap->pinned_addr)
521 kvmppc_unpin_guest_page(kvm, vpap->pinned_addr, vpap->gpa,
524 vpap->pinned_addr = va;
527 vpap->pinned_end = va + vpap->len;
530 static void kvmppc_update_vpas(struct kvm_vcpu *vcpu)
532 if (!(vcpu->arch.vpa.update_pending ||
533 vcpu->arch.slb_shadow.update_pending ||
534 vcpu->arch.dtl.update_pending))
537 spin_lock(&vcpu->arch.vpa_update_lock);
538 if (vcpu->arch.vpa.update_pending) {
539 kvmppc_update_vpa(vcpu, &vcpu->arch.vpa);
540 if (vcpu->arch.vpa.pinned_addr)
541 init_vpa(vcpu, vcpu->arch.vpa.pinned_addr);
543 if (vcpu->arch.dtl.update_pending) {
544 kvmppc_update_vpa(vcpu, &vcpu->arch.dtl);
545 vcpu->arch.dtl_ptr = vcpu->arch.dtl.pinned_addr;
546 vcpu->arch.dtl_index = 0;
548 if (vcpu->arch.slb_shadow.update_pending)
549 kvmppc_update_vpa(vcpu, &vcpu->arch.slb_shadow);
550 spin_unlock(&vcpu->arch.vpa_update_lock);
554 * Return the accumulated stolen time for the vcore up until `now'.
555 * The caller should hold the vcore lock.
557 static u64 vcore_stolen_time(struct kvmppc_vcore *vc, u64 now)
562 spin_lock_irqsave(&vc->stoltb_lock, flags);
564 if (vc->vcore_state != VCORE_INACTIVE &&
565 vc->preempt_tb != TB_NIL)
566 p += now - vc->preempt_tb;
567 spin_unlock_irqrestore(&vc->stoltb_lock, flags);
571 static void kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu,
572 struct kvmppc_vcore *vc)
574 struct dtl_entry *dt;
576 unsigned long stolen;
577 unsigned long core_stolen;
580 dt = vcpu->arch.dtl_ptr;
581 vpa = vcpu->arch.vpa.pinned_addr;
583 core_stolen = vcore_stolen_time(vc, now);
584 stolen = core_stolen - vcpu->arch.stolen_logged;
585 vcpu->arch.stolen_logged = core_stolen;
586 spin_lock_irq(&vcpu->arch.tbacct_lock);
587 stolen += vcpu->arch.busy_stolen;
588 vcpu->arch.busy_stolen = 0;
589 spin_unlock_irq(&vcpu->arch.tbacct_lock);
592 memset(dt, 0, sizeof(struct dtl_entry));
593 dt->dispatch_reason = 7;
594 dt->processor_id = cpu_to_be16(vc->pcpu + vcpu->arch.ptid);
595 dt->timebase = cpu_to_be64(now + vc->tb_offset);
596 dt->enqueue_to_dispatch_time = cpu_to_be32(stolen);
597 dt->srr0 = cpu_to_be64(kvmppc_get_pc(vcpu));
598 dt->srr1 = cpu_to_be64(vcpu->arch.shregs.msr);
600 if (dt == vcpu->arch.dtl.pinned_end)
601 dt = vcpu->arch.dtl.pinned_addr;
602 vcpu->arch.dtl_ptr = dt;
603 /* order writing *dt vs. writing vpa->dtl_idx */
605 vpa->dtl_idx = cpu_to_be64(++vcpu->arch.dtl_index);
606 vcpu->arch.dtl.dirty = true;
609 static bool kvmppc_power8_compatible(struct kvm_vcpu *vcpu)
611 if (vcpu->arch.vcore->arch_compat >= PVR_ARCH_207)
613 if ((!vcpu->arch.vcore->arch_compat) &&
614 cpu_has_feature(CPU_FTR_ARCH_207S))
619 static int kvmppc_h_set_mode(struct kvm_vcpu *vcpu, unsigned long mflags,
620 unsigned long resource, unsigned long value1,
621 unsigned long value2)
624 case H_SET_MODE_RESOURCE_SET_CIABR:
625 if (!kvmppc_power8_compatible(vcpu))
630 return H_UNSUPPORTED_FLAG_START;
631 /* Guests can't breakpoint the hypervisor */
632 if ((value1 & CIABR_PRIV) == CIABR_PRIV_HYPER)
634 vcpu->arch.ciabr = value1;
636 case H_SET_MODE_RESOURCE_SET_DAWR:
637 if (!kvmppc_power8_compatible(vcpu))
640 return H_UNSUPPORTED_FLAG_START;
641 if (value2 & DABRX_HYP)
643 vcpu->arch.dawr = value1;
644 vcpu->arch.dawrx = value2;
651 static int kvm_arch_vcpu_yield_to(struct kvm_vcpu *target)
653 struct kvmppc_vcore *vcore = target->arch.vcore;
656 * We expect to have been called by the real mode handler
657 * (kvmppc_rm_h_confer()) which would have directly returned
658 * H_SUCCESS if the source vcore wasn't idle (e.g. if it may
659 * have useful work to do and should not confer) so we don't
663 spin_lock(&vcore->lock);
664 if (target->arch.state == KVMPPC_VCPU_RUNNABLE &&
665 vcore->vcore_state != VCORE_INACTIVE &&
667 target = vcore->runner;
668 spin_unlock(&vcore->lock);
670 return kvm_vcpu_yield_to(target);
673 static int kvmppc_get_yield_count(struct kvm_vcpu *vcpu)
676 struct lppaca *lppaca;
678 spin_lock(&vcpu->arch.vpa_update_lock);
679 lppaca = (struct lppaca *)vcpu->arch.vpa.pinned_addr;
681 yield_count = be32_to_cpu(lppaca->yield_count);
682 spin_unlock(&vcpu->arch.vpa_update_lock);
686 int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
688 unsigned long req = kvmppc_get_gpr(vcpu, 3);
689 unsigned long target, ret = H_SUCCESS;
691 struct kvm_vcpu *tvcpu;
694 if (req <= MAX_HCALL_OPCODE &&
695 !test_bit(req/4, vcpu->kvm->arch.enabled_hcalls))
702 target = kvmppc_get_gpr(vcpu, 4);
703 tvcpu = kvmppc_find_vcpu(vcpu->kvm, target);
708 tvcpu->arch.prodded = 1;
710 if (vcpu->arch.ceded) {
711 if (waitqueue_active(&vcpu->wq)) {
712 wake_up_interruptible(&vcpu->wq);
713 vcpu->stat.halt_wakeup++;
718 target = kvmppc_get_gpr(vcpu, 4);
721 tvcpu = kvmppc_find_vcpu(vcpu->kvm, target);
726 yield_count = kvmppc_get_gpr(vcpu, 5);
727 if (kvmppc_get_yield_count(tvcpu) != yield_count)
729 kvm_arch_vcpu_yield_to(tvcpu);
732 ret = do_h_register_vpa(vcpu, kvmppc_get_gpr(vcpu, 4),
733 kvmppc_get_gpr(vcpu, 5),
734 kvmppc_get_gpr(vcpu, 6));
737 if (list_empty(&vcpu->kvm->arch.rtas_tokens))
740 idx = srcu_read_lock(&vcpu->kvm->srcu);
741 rc = kvmppc_rtas_hcall(vcpu);
742 srcu_read_unlock(&vcpu->kvm->srcu, idx);
749 /* Send the error out to userspace via KVM_RUN */
751 case H_LOGICAL_CI_LOAD:
752 ret = kvmppc_h_logical_ci_load(vcpu);
753 if (ret == H_TOO_HARD)
756 case H_LOGICAL_CI_STORE:
757 ret = kvmppc_h_logical_ci_store(vcpu);
758 if (ret == H_TOO_HARD)
762 ret = kvmppc_h_set_mode(vcpu, kvmppc_get_gpr(vcpu, 4),
763 kvmppc_get_gpr(vcpu, 5),
764 kvmppc_get_gpr(vcpu, 6),
765 kvmppc_get_gpr(vcpu, 7));
766 if (ret == H_TOO_HARD)
775 if (kvmppc_xics_enabled(vcpu)) {
776 ret = kvmppc_xics_hcall(vcpu, req);
782 kvmppc_set_gpr(vcpu, 3, ret);
783 vcpu->arch.hcall_needed = 0;
787 static int kvmppc_hcall_impl_hv(unsigned long cmd)
795 case H_LOGICAL_CI_LOAD:
796 case H_LOGICAL_CI_STORE:
797 #ifdef CONFIG_KVM_XICS
808 /* See if it's in the real-mode table */
809 return kvmppc_hcall_impl_hv_realmode(cmd);
812 static int kvmppc_emulate_debug_inst(struct kvm_run *run,
813 struct kvm_vcpu *vcpu)
817 if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst) !=
820 * Fetch failed, so return to guest and
821 * try executing it again.
826 if (last_inst == KVMPPC_INST_SW_BREAKPOINT) {
827 run->exit_reason = KVM_EXIT_DEBUG;
828 run->debug.arch.address = kvmppc_get_pc(vcpu);
831 kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
836 static int kvmppc_handle_exit_hv(struct kvm_run *run, struct kvm_vcpu *vcpu,
837 struct task_struct *tsk)
841 vcpu->stat.sum_exits++;
843 run->exit_reason = KVM_EXIT_UNKNOWN;
844 run->ready_for_interrupt_injection = 1;
845 switch (vcpu->arch.trap) {
846 /* We're good on these - the host merely wanted to get our attention */
847 case BOOK3S_INTERRUPT_HV_DECREMENTER:
848 vcpu->stat.dec_exits++;
851 case BOOK3S_INTERRUPT_EXTERNAL:
852 case BOOK3S_INTERRUPT_H_DOORBELL:
853 vcpu->stat.ext_intr_exits++;
856 /* HMI is hypervisor interrupt and host has handled it. Resume guest.*/
857 case BOOK3S_INTERRUPT_HMI:
858 case BOOK3S_INTERRUPT_PERFMON:
861 case BOOK3S_INTERRUPT_MACHINE_CHECK:
863 * Deliver a machine check interrupt to the guest.
864 * We have to do this, even if the host has handled the
865 * machine check, because machine checks use SRR0/1 and
866 * the interrupt might have trashed guest state in them.
868 kvmppc_book3s_queue_irqprio(vcpu,
869 BOOK3S_INTERRUPT_MACHINE_CHECK);
872 case BOOK3S_INTERRUPT_PROGRAM:
876 * Normally program interrupts are delivered directly
877 * to the guest by the hardware, but we can get here
878 * as a result of a hypervisor emulation interrupt
879 * (e40) getting turned into a 700 by BML RTAS.
881 flags = vcpu->arch.shregs.msr & 0x1f0000ull;
882 kvmppc_core_queue_program(vcpu, flags);
886 case BOOK3S_INTERRUPT_SYSCALL:
888 /* hcall - punt to userspace */
891 /* hypercall with MSR_PR has already been handled in rmode,
892 * and never reaches here.
895 run->papr_hcall.nr = kvmppc_get_gpr(vcpu, 3);
896 for (i = 0; i < 9; ++i)
897 run->papr_hcall.args[i] = kvmppc_get_gpr(vcpu, 4 + i);
898 run->exit_reason = KVM_EXIT_PAPR_HCALL;
899 vcpu->arch.hcall_needed = 1;
904 * We get these next two if the guest accesses a page which it thinks
905 * it has mapped but which is not actually present, either because
906 * it is for an emulated I/O device or because the corresonding
907 * host page has been paged out. Any other HDSI/HISI interrupts
908 * have been handled already.
910 case BOOK3S_INTERRUPT_H_DATA_STORAGE:
911 r = RESUME_PAGE_FAULT;
913 case BOOK3S_INTERRUPT_H_INST_STORAGE:
914 vcpu->arch.fault_dar = kvmppc_get_pc(vcpu);
915 vcpu->arch.fault_dsisr = 0;
916 r = RESUME_PAGE_FAULT;
919 * This occurs if the guest executes an illegal instruction.
920 * If the guest debug is disabled, generate a program interrupt
921 * to the guest. If guest debug is enabled, we need to check
922 * whether the instruction is a software breakpoint instruction.
923 * Accordingly return to Guest or Host.
925 case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
926 if (vcpu->arch.emul_inst != KVM_INST_FETCH_FAILED)
927 vcpu->arch.last_inst = kvmppc_need_byteswap(vcpu) ?
928 swab32(vcpu->arch.emul_inst) :
929 vcpu->arch.emul_inst;
930 if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) {
931 r = kvmppc_emulate_debug_inst(run, vcpu);
933 kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
938 * This occurs if the guest (kernel or userspace), does something that
939 * is prohibited by HFSCR. We just generate a program interrupt to
942 case BOOK3S_INTERRUPT_H_FAC_UNAVAIL:
943 kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
947 kvmppc_dump_regs(vcpu);
948 printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n",
949 vcpu->arch.trap, kvmppc_get_pc(vcpu),
950 vcpu->arch.shregs.msr);
951 run->hw.hardware_exit_reason = vcpu->arch.trap;
959 static int kvm_arch_vcpu_ioctl_get_sregs_hv(struct kvm_vcpu *vcpu,
960 struct kvm_sregs *sregs)
964 memset(sregs, 0, sizeof(struct kvm_sregs));
965 sregs->pvr = vcpu->arch.pvr;
966 for (i = 0; i < vcpu->arch.slb_max; i++) {
967 sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige;
968 sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
974 static int kvm_arch_vcpu_ioctl_set_sregs_hv(struct kvm_vcpu *vcpu,
975 struct kvm_sregs *sregs)
979 /* Only accept the same PVR as the host's, since we can't spoof it */
980 if (sregs->pvr != vcpu->arch.pvr)
984 for (i = 0; i < vcpu->arch.slb_nr; i++) {
985 if (sregs->u.s.ppc64.slb[i].slbe & SLB_ESID_V) {
986 vcpu->arch.slb[j].orige = sregs->u.s.ppc64.slb[i].slbe;
987 vcpu->arch.slb[j].origv = sregs->u.s.ppc64.slb[i].slbv;
991 vcpu->arch.slb_max = j;
996 static void kvmppc_set_lpcr(struct kvm_vcpu *vcpu, u64 new_lpcr,
999 struct kvm *kvm = vcpu->kvm;
1000 struct kvmppc_vcore *vc = vcpu->arch.vcore;
1003 mutex_lock(&kvm->lock);
1004 spin_lock(&vc->lock);
1006 * If ILE (interrupt little-endian) has changed, update the
1007 * MSR_LE bit in the intr_msr for each vcpu in this vcore.
1009 if ((new_lpcr & LPCR_ILE) != (vc->lpcr & LPCR_ILE)) {
1010 struct kvm_vcpu *vcpu;
1013 kvm_for_each_vcpu(i, vcpu, kvm) {
1014 if (vcpu->arch.vcore != vc)
1016 if (new_lpcr & LPCR_ILE)
1017 vcpu->arch.intr_msr |= MSR_LE;
1019 vcpu->arch.intr_msr &= ~MSR_LE;
1024 * Userspace can only modify DPFD (default prefetch depth),
1025 * ILE (interrupt little-endian) and TC (translation control).
1026 * On POWER8 userspace can also modify AIL (alt. interrupt loc.)
1028 mask = LPCR_DPFD | LPCR_ILE | LPCR_TC;
1029 if (cpu_has_feature(CPU_FTR_ARCH_207S))
1032 /* Broken 32-bit version of LPCR must not clear top bits */
1035 vc->lpcr = (vc->lpcr & ~mask) | (new_lpcr & mask);
1036 spin_unlock(&vc->lock);
1037 mutex_unlock(&kvm->lock);
1040 static int kvmppc_get_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
1041 union kvmppc_one_reg *val)
1047 case KVM_REG_PPC_DEBUG_INST:
1048 *val = get_reg_val(id, KVMPPC_INST_SW_BREAKPOINT);
1050 case KVM_REG_PPC_HIOR:
1051 *val = get_reg_val(id, 0);
1053 case KVM_REG_PPC_DABR:
1054 *val = get_reg_val(id, vcpu->arch.dabr);
1056 case KVM_REG_PPC_DABRX:
1057 *val = get_reg_val(id, vcpu->arch.dabrx);
1059 case KVM_REG_PPC_DSCR:
1060 *val = get_reg_val(id, vcpu->arch.dscr);
1062 case KVM_REG_PPC_PURR:
1063 *val = get_reg_val(id, vcpu->arch.purr);
1065 case KVM_REG_PPC_SPURR:
1066 *val = get_reg_val(id, vcpu->arch.spurr);
1068 case KVM_REG_PPC_AMR:
1069 *val = get_reg_val(id, vcpu->arch.amr);
1071 case KVM_REG_PPC_UAMOR:
1072 *val = get_reg_val(id, vcpu->arch.uamor);
1074 case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCRS:
1075 i = id - KVM_REG_PPC_MMCR0;
1076 *val = get_reg_val(id, vcpu->arch.mmcr[i]);
1078 case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8:
1079 i = id - KVM_REG_PPC_PMC1;
1080 *val = get_reg_val(id, vcpu->arch.pmc[i]);
1082 case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2:
1083 i = id - KVM_REG_PPC_SPMC1;
1084 *val = get_reg_val(id, vcpu->arch.spmc[i]);
1086 case KVM_REG_PPC_SIAR:
1087 *val = get_reg_val(id, vcpu->arch.siar);
1089 case KVM_REG_PPC_SDAR:
1090 *val = get_reg_val(id, vcpu->arch.sdar);
1092 case KVM_REG_PPC_SIER:
1093 *val = get_reg_val(id, vcpu->arch.sier);
1095 case KVM_REG_PPC_IAMR:
1096 *val = get_reg_val(id, vcpu->arch.iamr);
1098 case KVM_REG_PPC_PSPB:
1099 *val = get_reg_val(id, vcpu->arch.pspb);
1101 case KVM_REG_PPC_DPDES:
1102 *val = get_reg_val(id, vcpu->arch.vcore->dpdes);
1104 case KVM_REG_PPC_DAWR:
1105 *val = get_reg_val(id, vcpu->arch.dawr);
1107 case KVM_REG_PPC_DAWRX:
1108 *val = get_reg_val(id, vcpu->arch.dawrx);
1110 case KVM_REG_PPC_CIABR:
1111 *val = get_reg_val(id, vcpu->arch.ciabr);
1113 case KVM_REG_PPC_CSIGR:
1114 *val = get_reg_val(id, vcpu->arch.csigr);
1116 case KVM_REG_PPC_TACR:
1117 *val = get_reg_val(id, vcpu->arch.tacr);
1119 case KVM_REG_PPC_TCSCR:
1120 *val = get_reg_val(id, vcpu->arch.tcscr);
1122 case KVM_REG_PPC_PID:
1123 *val = get_reg_val(id, vcpu->arch.pid);
1125 case KVM_REG_PPC_ACOP:
1126 *val = get_reg_val(id, vcpu->arch.acop);
1128 case KVM_REG_PPC_WORT:
1129 *val = get_reg_val(id, vcpu->arch.wort);
1131 case KVM_REG_PPC_VPA_ADDR:
1132 spin_lock(&vcpu->arch.vpa_update_lock);
1133 *val = get_reg_val(id, vcpu->arch.vpa.next_gpa);
1134 spin_unlock(&vcpu->arch.vpa_update_lock);
1136 case KVM_REG_PPC_VPA_SLB:
1137 spin_lock(&vcpu->arch.vpa_update_lock);
1138 val->vpaval.addr = vcpu->arch.slb_shadow.next_gpa;
1139 val->vpaval.length = vcpu->arch.slb_shadow.len;
1140 spin_unlock(&vcpu->arch.vpa_update_lock);
1142 case KVM_REG_PPC_VPA_DTL:
1143 spin_lock(&vcpu->arch.vpa_update_lock);
1144 val->vpaval.addr = vcpu->arch.dtl.next_gpa;
1145 val->vpaval.length = vcpu->arch.dtl.len;
1146 spin_unlock(&vcpu->arch.vpa_update_lock);
1148 case KVM_REG_PPC_TB_OFFSET:
1149 *val = get_reg_val(id, vcpu->arch.vcore->tb_offset);
1151 case KVM_REG_PPC_LPCR:
1152 case KVM_REG_PPC_LPCR_64:
1153 *val = get_reg_val(id, vcpu->arch.vcore->lpcr);
1155 case KVM_REG_PPC_PPR:
1156 *val = get_reg_val(id, vcpu->arch.ppr);
1158 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1159 case KVM_REG_PPC_TFHAR:
1160 *val = get_reg_val(id, vcpu->arch.tfhar);
1162 case KVM_REG_PPC_TFIAR:
1163 *val = get_reg_val(id, vcpu->arch.tfiar);
1165 case KVM_REG_PPC_TEXASR:
1166 *val = get_reg_val(id, vcpu->arch.texasr);
1168 case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31:
1169 i = id - KVM_REG_PPC_TM_GPR0;
1170 *val = get_reg_val(id, vcpu->arch.gpr_tm[i]);
1172 case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63:
1175 i = id - KVM_REG_PPC_TM_VSR0;
1177 for (j = 0; j < TS_FPRWIDTH; j++)
1178 val->vsxval[j] = vcpu->arch.fp_tm.fpr[i][j];
1180 if (cpu_has_feature(CPU_FTR_ALTIVEC))
1181 val->vval = vcpu->arch.vr_tm.vr[i-32];
1187 case KVM_REG_PPC_TM_CR:
1188 *val = get_reg_val(id, vcpu->arch.cr_tm);
1190 case KVM_REG_PPC_TM_LR:
1191 *val = get_reg_val(id, vcpu->arch.lr_tm);
1193 case KVM_REG_PPC_TM_CTR:
1194 *val = get_reg_val(id, vcpu->arch.ctr_tm);
1196 case KVM_REG_PPC_TM_FPSCR:
1197 *val = get_reg_val(id, vcpu->arch.fp_tm.fpscr);
1199 case KVM_REG_PPC_TM_AMR:
1200 *val = get_reg_val(id, vcpu->arch.amr_tm);
1202 case KVM_REG_PPC_TM_PPR:
1203 *val = get_reg_val(id, vcpu->arch.ppr_tm);
1205 case KVM_REG_PPC_TM_VRSAVE:
1206 *val = get_reg_val(id, vcpu->arch.vrsave_tm);
1208 case KVM_REG_PPC_TM_VSCR:
1209 if (cpu_has_feature(CPU_FTR_ALTIVEC))
1210 *val = get_reg_val(id, vcpu->arch.vr_tm.vscr.u[3]);
1214 case KVM_REG_PPC_TM_DSCR:
1215 *val = get_reg_val(id, vcpu->arch.dscr_tm);
1217 case KVM_REG_PPC_TM_TAR:
1218 *val = get_reg_val(id, vcpu->arch.tar_tm);
1221 case KVM_REG_PPC_ARCH_COMPAT:
1222 *val = get_reg_val(id, vcpu->arch.vcore->arch_compat);
1232 static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
1233 union kvmppc_one_reg *val)
1237 unsigned long addr, len;
1240 case KVM_REG_PPC_HIOR:
1241 /* Only allow this to be set to zero */
1242 if (set_reg_val(id, *val))
1245 case KVM_REG_PPC_DABR:
1246 vcpu->arch.dabr = set_reg_val(id, *val);
1248 case KVM_REG_PPC_DABRX:
1249 vcpu->arch.dabrx = set_reg_val(id, *val) & ~DABRX_HYP;
1251 case KVM_REG_PPC_DSCR:
1252 vcpu->arch.dscr = set_reg_val(id, *val);
1254 case KVM_REG_PPC_PURR:
1255 vcpu->arch.purr = set_reg_val(id, *val);
1257 case KVM_REG_PPC_SPURR:
1258 vcpu->arch.spurr = set_reg_val(id, *val);
1260 case KVM_REG_PPC_AMR:
1261 vcpu->arch.amr = set_reg_val(id, *val);
1263 case KVM_REG_PPC_UAMOR:
1264 vcpu->arch.uamor = set_reg_val(id, *val);
1266 case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCRS:
1267 i = id - KVM_REG_PPC_MMCR0;
1268 vcpu->arch.mmcr[i] = set_reg_val(id, *val);
1270 case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8:
1271 i = id - KVM_REG_PPC_PMC1;
1272 vcpu->arch.pmc[i] = set_reg_val(id, *val);
1274 case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2:
1275 i = id - KVM_REG_PPC_SPMC1;
1276 vcpu->arch.spmc[i] = set_reg_val(id, *val);
1278 case KVM_REG_PPC_SIAR:
1279 vcpu->arch.siar = set_reg_val(id, *val);
1281 case KVM_REG_PPC_SDAR:
1282 vcpu->arch.sdar = set_reg_val(id, *val);
1284 case KVM_REG_PPC_SIER:
1285 vcpu->arch.sier = set_reg_val(id, *val);
1287 case KVM_REG_PPC_IAMR:
1288 vcpu->arch.iamr = set_reg_val(id, *val);
1290 case KVM_REG_PPC_PSPB:
1291 vcpu->arch.pspb = set_reg_val(id, *val);
1293 case KVM_REG_PPC_DPDES:
1294 vcpu->arch.vcore->dpdes = set_reg_val(id, *val);
1296 case KVM_REG_PPC_DAWR:
1297 vcpu->arch.dawr = set_reg_val(id, *val);
1299 case KVM_REG_PPC_DAWRX:
1300 vcpu->arch.dawrx = set_reg_val(id, *val) & ~DAWRX_HYP;
1302 case KVM_REG_PPC_CIABR:
1303 vcpu->arch.ciabr = set_reg_val(id, *val);
1304 /* Don't allow setting breakpoints in hypervisor code */
1305 if ((vcpu->arch.ciabr & CIABR_PRIV) == CIABR_PRIV_HYPER)
1306 vcpu->arch.ciabr &= ~CIABR_PRIV; /* disable */
1308 case KVM_REG_PPC_CSIGR:
1309 vcpu->arch.csigr = set_reg_val(id, *val);
1311 case KVM_REG_PPC_TACR:
1312 vcpu->arch.tacr = set_reg_val(id, *val);
1314 case KVM_REG_PPC_TCSCR:
1315 vcpu->arch.tcscr = set_reg_val(id, *val);
1317 case KVM_REG_PPC_PID:
1318 vcpu->arch.pid = set_reg_val(id, *val);
1320 case KVM_REG_PPC_ACOP:
1321 vcpu->arch.acop = set_reg_val(id, *val);
1323 case KVM_REG_PPC_WORT:
1324 vcpu->arch.wort = set_reg_val(id, *val);
1326 case KVM_REG_PPC_VPA_ADDR:
1327 addr = set_reg_val(id, *val);
1329 if (!addr && (vcpu->arch.slb_shadow.next_gpa ||
1330 vcpu->arch.dtl.next_gpa))
1332 r = set_vpa(vcpu, &vcpu->arch.vpa, addr, sizeof(struct lppaca));
1334 case KVM_REG_PPC_VPA_SLB:
1335 addr = val->vpaval.addr;
1336 len = val->vpaval.length;
1338 if (addr && !vcpu->arch.vpa.next_gpa)
1340 r = set_vpa(vcpu, &vcpu->arch.slb_shadow, addr, len);
1342 case KVM_REG_PPC_VPA_DTL:
1343 addr = val->vpaval.addr;
1344 len = val->vpaval.length;
1346 if (addr && (len < sizeof(struct dtl_entry) ||
1347 !vcpu->arch.vpa.next_gpa))
1349 len -= len % sizeof(struct dtl_entry);
1350 r = set_vpa(vcpu, &vcpu->arch.dtl, addr, len);
1352 case KVM_REG_PPC_TB_OFFSET:
1353 /* round up to multiple of 2^24 */
1354 vcpu->arch.vcore->tb_offset =
1355 ALIGN(set_reg_val(id, *val), 1UL << 24);
1357 case KVM_REG_PPC_LPCR:
1358 kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), true);
1360 case KVM_REG_PPC_LPCR_64:
1361 kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), false);
1363 case KVM_REG_PPC_PPR:
1364 vcpu->arch.ppr = set_reg_val(id, *val);
1366 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1367 case KVM_REG_PPC_TFHAR:
1368 vcpu->arch.tfhar = set_reg_val(id, *val);
1370 case KVM_REG_PPC_TFIAR:
1371 vcpu->arch.tfiar = set_reg_val(id, *val);
1373 case KVM_REG_PPC_TEXASR:
1374 vcpu->arch.texasr = set_reg_val(id, *val);
1376 case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31:
1377 i = id - KVM_REG_PPC_TM_GPR0;
1378 vcpu->arch.gpr_tm[i] = set_reg_val(id, *val);
1380 case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63:
1383 i = id - KVM_REG_PPC_TM_VSR0;
1385 for (j = 0; j < TS_FPRWIDTH; j++)
1386 vcpu->arch.fp_tm.fpr[i][j] = val->vsxval[j];
1388 if (cpu_has_feature(CPU_FTR_ALTIVEC))
1389 vcpu->arch.vr_tm.vr[i-32] = val->vval;
1394 case KVM_REG_PPC_TM_CR:
1395 vcpu->arch.cr_tm = set_reg_val(id, *val);
1397 case KVM_REG_PPC_TM_LR:
1398 vcpu->arch.lr_tm = set_reg_val(id, *val);
1400 case KVM_REG_PPC_TM_CTR:
1401 vcpu->arch.ctr_tm = set_reg_val(id, *val);
1403 case KVM_REG_PPC_TM_FPSCR:
1404 vcpu->arch.fp_tm.fpscr = set_reg_val(id, *val);
1406 case KVM_REG_PPC_TM_AMR:
1407 vcpu->arch.amr_tm = set_reg_val(id, *val);
1409 case KVM_REG_PPC_TM_PPR:
1410 vcpu->arch.ppr_tm = set_reg_val(id, *val);
1412 case KVM_REG_PPC_TM_VRSAVE:
1413 vcpu->arch.vrsave_tm = set_reg_val(id, *val);
1415 case KVM_REG_PPC_TM_VSCR:
1416 if (cpu_has_feature(CPU_FTR_ALTIVEC))
1417 vcpu->arch.vr.vscr.u[3] = set_reg_val(id, *val);
1421 case KVM_REG_PPC_TM_DSCR:
1422 vcpu->arch.dscr_tm = set_reg_val(id, *val);
1424 case KVM_REG_PPC_TM_TAR:
1425 vcpu->arch.tar_tm = set_reg_val(id, *val);
1428 case KVM_REG_PPC_ARCH_COMPAT:
1429 r = kvmppc_set_arch_compat(vcpu, set_reg_val(id, *val));
1439 static struct kvmppc_vcore *kvmppc_vcore_create(struct kvm *kvm, int core)
1441 struct kvmppc_vcore *vcore;
1443 vcore = kzalloc(sizeof(struct kvmppc_vcore), GFP_KERNEL);
1448 INIT_LIST_HEAD(&vcore->runnable_threads);
1449 spin_lock_init(&vcore->lock);
1450 spin_lock_init(&vcore->stoltb_lock);
1451 init_waitqueue_head(&vcore->wq);
1452 vcore->preempt_tb = TB_NIL;
1453 vcore->lpcr = kvm->arch.lpcr;
1454 vcore->first_vcpuid = core * threads_per_subcore;
1456 INIT_LIST_HEAD(&vcore->preempt_list);
1458 vcore->mpp_buffer_is_valid = false;
1460 if (cpu_has_feature(CPU_FTR_ARCH_207S))
1461 vcore->mpp_buffer = (void *)__get_free_pages(
1462 GFP_KERNEL|__GFP_ZERO,
1468 #ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING
1469 static struct debugfs_timings_element {
1473 {"rm_entry", offsetof(struct kvm_vcpu, arch.rm_entry)},
1474 {"rm_intr", offsetof(struct kvm_vcpu, arch.rm_intr)},
1475 {"rm_exit", offsetof(struct kvm_vcpu, arch.rm_exit)},
1476 {"guest", offsetof(struct kvm_vcpu, arch.guest_time)},
1477 {"cede", offsetof(struct kvm_vcpu, arch.cede_time)},
1480 #define N_TIMINGS (sizeof(timings) / sizeof(timings[0]))
1482 struct debugfs_timings_state {
1483 struct kvm_vcpu *vcpu;
1484 unsigned int buflen;
1485 char buf[N_TIMINGS * 100];
1488 static int debugfs_timings_open(struct inode *inode, struct file *file)
1490 struct kvm_vcpu *vcpu = inode->i_private;
1491 struct debugfs_timings_state *p;
1493 p = kzalloc(sizeof(*p), GFP_KERNEL);
1497 kvm_get_kvm(vcpu->kvm);
1499 file->private_data = p;
1501 return nonseekable_open(inode, file);
1504 static int debugfs_timings_release(struct inode *inode, struct file *file)
1506 struct debugfs_timings_state *p = file->private_data;
1508 kvm_put_kvm(p->vcpu->kvm);
1513 static ssize_t debugfs_timings_read(struct file *file, char __user *buf,
1514 size_t len, loff_t *ppos)
1516 struct debugfs_timings_state *p = file->private_data;
1517 struct kvm_vcpu *vcpu = p->vcpu;
1519 struct kvmhv_tb_accumulator tb;
1528 buf_end = s + sizeof(p->buf);
1529 for (i = 0; i < N_TIMINGS; ++i) {
1530 struct kvmhv_tb_accumulator *acc;
1532 acc = (struct kvmhv_tb_accumulator *)
1533 ((unsigned long)vcpu + timings[i].offset);
1535 for (loops = 0; loops < 1000; ++loops) {
1536 count = acc->seqcount;
1541 if (count == acc->seqcount) {
1549 snprintf(s, buf_end - s, "%s: stuck\n",
1552 snprintf(s, buf_end - s,
1553 "%s: %llu %llu %llu %llu\n",
1554 timings[i].name, count / 2,
1555 tb_to_ns(tb.tb_total),
1556 tb_to_ns(tb.tb_min),
1557 tb_to_ns(tb.tb_max));
1560 p->buflen = s - p->buf;
1564 if (pos >= p->buflen)
1566 if (len > p->buflen - pos)
1567 len = p->buflen - pos;
1568 n = copy_to_user(buf, p->buf + pos, len);
1578 static ssize_t debugfs_timings_write(struct file *file, const char __user *buf,
1579 size_t len, loff_t *ppos)
1584 static const struct file_operations debugfs_timings_ops = {
1585 .owner = THIS_MODULE,
1586 .open = debugfs_timings_open,
1587 .release = debugfs_timings_release,
1588 .read = debugfs_timings_read,
1589 .write = debugfs_timings_write,
1590 .llseek = generic_file_llseek,
1593 /* Create a debugfs directory for the vcpu */
1594 static void debugfs_vcpu_init(struct kvm_vcpu *vcpu, unsigned int id)
1597 struct kvm *kvm = vcpu->kvm;
1599 snprintf(buf, sizeof(buf), "vcpu%u", id);
1600 if (IS_ERR_OR_NULL(kvm->arch.debugfs_dir))
1602 vcpu->arch.debugfs_dir = debugfs_create_dir(buf, kvm->arch.debugfs_dir);
1603 if (IS_ERR_OR_NULL(vcpu->arch.debugfs_dir))
1605 vcpu->arch.debugfs_timings =
1606 debugfs_create_file("timings", 0444, vcpu->arch.debugfs_dir,
1607 vcpu, &debugfs_timings_ops);
1610 #else /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */
1611 static void debugfs_vcpu_init(struct kvm_vcpu *vcpu, unsigned int id)
1614 #endif /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */
1616 static struct kvm_vcpu *kvmppc_core_vcpu_create_hv(struct kvm *kvm,
1619 struct kvm_vcpu *vcpu;
1622 struct kvmppc_vcore *vcore;
1624 core = id / threads_per_subcore;
1625 if (core >= KVM_MAX_VCORES)
1629 vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
1633 err = kvm_vcpu_init(vcpu, kvm, id);
1637 vcpu->arch.shared = &vcpu->arch.shregs;
1638 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
1640 * The shared struct is never shared on HV,
1641 * so we can always use host endianness
1643 #ifdef __BIG_ENDIAN__
1644 vcpu->arch.shared_big_endian = true;
1646 vcpu->arch.shared_big_endian = false;
1649 vcpu->arch.mmcr[0] = MMCR0_FC;
1650 vcpu->arch.ctrl = CTRL_RUNLATCH;
1651 /* default to host PVR, since we can't spoof it */
1652 kvmppc_set_pvr_hv(vcpu, mfspr(SPRN_PVR));
1653 spin_lock_init(&vcpu->arch.vpa_update_lock);
1654 spin_lock_init(&vcpu->arch.tbacct_lock);
1655 vcpu->arch.busy_preempt = TB_NIL;
1656 vcpu->arch.intr_msr = MSR_SF | MSR_ME;
1658 kvmppc_mmu_book3s_hv_init(vcpu);
1660 vcpu->arch.state = KVMPPC_VCPU_NOTREADY;
1662 init_waitqueue_head(&vcpu->arch.cpu_run);
1664 mutex_lock(&kvm->lock);
1665 vcore = kvm->arch.vcores[core];
1667 vcore = kvmppc_vcore_create(kvm, core);
1668 kvm->arch.vcores[core] = vcore;
1669 kvm->arch.online_vcores++;
1671 mutex_unlock(&kvm->lock);
1676 spin_lock(&vcore->lock);
1677 ++vcore->num_threads;
1678 spin_unlock(&vcore->lock);
1679 vcpu->arch.vcore = vcore;
1680 vcpu->arch.ptid = vcpu->vcpu_id - vcore->first_vcpuid;
1681 vcpu->arch.thread_cpu = -1;
1683 vcpu->arch.cpu_type = KVM_CPU_3S_64;
1684 kvmppc_sanity_check(vcpu);
1686 debugfs_vcpu_init(vcpu, id);
1691 kmem_cache_free(kvm_vcpu_cache, vcpu);
1693 return ERR_PTR(err);
1696 static void unpin_vpa(struct kvm *kvm, struct kvmppc_vpa *vpa)
1698 if (vpa->pinned_addr)
1699 kvmppc_unpin_guest_page(kvm, vpa->pinned_addr, vpa->gpa,
1703 static void kvmppc_core_vcpu_free_hv(struct kvm_vcpu *vcpu)
1705 spin_lock(&vcpu->arch.vpa_update_lock);
1706 unpin_vpa(vcpu->kvm, &vcpu->arch.dtl);
1707 unpin_vpa(vcpu->kvm, &vcpu->arch.slb_shadow);
1708 unpin_vpa(vcpu->kvm, &vcpu->arch.vpa);
1709 spin_unlock(&vcpu->arch.vpa_update_lock);
1710 kvm_vcpu_uninit(vcpu);
1711 kmem_cache_free(kvm_vcpu_cache, vcpu);
1714 static int kvmppc_core_check_requests_hv(struct kvm_vcpu *vcpu)
1716 /* Indicate we want to get back into the guest */
1720 static void kvmppc_set_timer(struct kvm_vcpu *vcpu)
1722 unsigned long dec_nsec, now;
1725 if (now > vcpu->arch.dec_expires) {
1726 /* decrementer has already gone negative */
1727 kvmppc_core_queue_dec(vcpu);
1728 kvmppc_core_prepare_to_enter(vcpu);
1731 dec_nsec = (vcpu->arch.dec_expires - now) * NSEC_PER_SEC
1733 hrtimer_start(&vcpu->arch.dec_timer, ktime_set(0, dec_nsec),
1735 vcpu->arch.timer_running = 1;
1738 static void kvmppc_end_cede(struct kvm_vcpu *vcpu)
1740 vcpu->arch.ceded = 0;
1741 if (vcpu->arch.timer_running) {
1742 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
1743 vcpu->arch.timer_running = 0;
1747 extern void __kvmppc_vcore_entry(void);
1749 static void kvmppc_remove_runnable(struct kvmppc_vcore *vc,
1750 struct kvm_vcpu *vcpu)
1754 if (vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
1756 spin_lock_irq(&vcpu->arch.tbacct_lock);
1758 vcpu->arch.busy_stolen += vcore_stolen_time(vc, now) -
1759 vcpu->arch.stolen_logged;
1760 vcpu->arch.busy_preempt = now;
1761 vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
1762 spin_unlock_irq(&vcpu->arch.tbacct_lock);
1764 list_del(&vcpu->arch.run_list);
1767 static int kvmppc_grab_hwthread(int cpu)
1769 struct paca_struct *tpaca;
1770 long timeout = 10000;
1774 /* Ensure the thread won't go into the kernel if it wakes */
1775 tpaca->kvm_hstate.kvm_vcpu = NULL;
1776 tpaca->kvm_hstate.kvm_vcore = NULL;
1777 tpaca->kvm_hstate.napping = 0;
1779 tpaca->kvm_hstate.hwthread_req = 1;
1782 * If the thread is already executing in the kernel (e.g. handling
1783 * a stray interrupt), wait for it to get back to nap mode.
1784 * The smp_mb() is to ensure that our setting of hwthread_req
1785 * is visible before we look at hwthread_state, so if this
1786 * races with the code at system_reset_pSeries and the thread
1787 * misses our setting of hwthread_req, we are sure to see its
1788 * setting of hwthread_state, and vice versa.
1791 while (tpaca->kvm_hstate.hwthread_state == KVM_HWTHREAD_IN_KERNEL) {
1792 if (--timeout <= 0) {
1793 pr_err("KVM: couldn't grab cpu %d\n", cpu);
1801 static void kvmppc_release_hwthread(int cpu)
1803 struct paca_struct *tpaca;
1806 tpaca->kvm_hstate.hwthread_req = 0;
1807 tpaca->kvm_hstate.kvm_vcpu = NULL;
1808 tpaca->kvm_hstate.kvm_vcore = NULL;
1809 tpaca->kvm_hstate.kvm_split_mode = NULL;
1812 static void kvmppc_start_thread(struct kvm_vcpu *vcpu, struct kvmppc_vcore *vc)
1815 struct paca_struct *tpaca;
1816 struct kvmppc_vcore *mvc = vc->master_vcore;
1820 if (vcpu->arch.timer_running) {
1821 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
1822 vcpu->arch.timer_running = 0;
1824 cpu += vcpu->arch.ptid;
1825 vcpu->cpu = mvc->pcpu;
1826 vcpu->arch.thread_cpu = cpu;
1829 tpaca->kvm_hstate.kvm_vcpu = vcpu;
1830 tpaca->kvm_hstate.ptid = cpu - mvc->pcpu;
1831 /* Order stores to hstate.kvm_vcpu etc. before store to kvm_vcore */
1833 tpaca->kvm_hstate.kvm_vcore = mvc;
1834 if (cpu != smp_processor_id())
1835 kvmppc_ipi_thread(cpu);
1838 static void kvmppc_wait_for_nap(void)
1840 int cpu = smp_processor_id();
1843 for (loops = 0; loops < 1000000; ++loops) {
1845 * Check if all threads are finished.
1846 * We set the vcore pointer when starting a thread
1847 * and the thread clears it when finished, so we look
1848 * for any threads that still have a non-NULL vcore ptr.
1850 for (i = 1; i < threads_per_subcore; ++i)
1851 if (paca[cpu + i].kvm_hstate.kvm_vcore)
1853 if (i == threads_per_subcore) {
1860 for (i = 1; i < threads_per_subcore; ++i)
1861 if (paca[cpu + i].kvm_hstate.kvm_vcore)
1862 pr_err("KVM: CPU %d seems to be stuck\n", cpu + i);
1866 * Check that we are on thread 0 and that any other threads in
1867 * this core are off-line. Then grab the threads so they can't
1870 static int on_primary_thread(void)
1872 int cpu = smp_processor_id();
1875 /* Are we on a primary subcore? */
1876 if (cpu_thread_in_subcore(cpu))
1880 while (++thr < threads_per_subcore)
1881 if (cpu_online(cpu + thr))
1884 /* Grab all hw threads so they can't go into the kernel */
1885 for (thr = 1; thr < threads_per_subcore; ++thr) {
1886 if (kvmppc_grab_hwthread(cpu + thr)) {
1887 /* Couldn't grab one; let the others go */
1889 kvmppc_release_hwthread(cpu + thr);
1890 } while (--thr > 0);
1897 static void kvmppc_start_saving_l2_cache(struct kvmppc_vcore *vc)
1899 phys_addr_t phy_addr, mpp_addr;
1901 phy_addr = (phys_addr_t)virt_to_phys(vc->mpp_buffer);
1902 mpp_addr = phy_addr & PPC_MPPE_ADDRESS_MASK;
1904 mtspr(SPRN_MPPR, mpp_addr | PPC_MPPR_FETCH_ABORT);
1905 logmpp(mpp_addr | PPC_LOGMPP_LOG_L2);
1907 vc->mpp_buffer_is_valid = true;
1910 static void kvmppc_start_restoring_l2_cache(const struct kvmppc_vcore *vc)
1912 phys_addr_t phy_addr, mpp_addr;
1914 phy_addr = virt_to_phys(vc->mpp_buffer);
1915 mpp_addr = phy_addr & PPC_MPPE_ADDRESS_MASK;
1917 /* We must abort any in-progress save operations to ensure
1918 * the table is valid so that prefetch engine knows when to
1919 * stop prefetching. */
1920 logmpp(mpp_addr | PPC_LOGMPP_LOG_ABORT);
1921 mtspr(SPRN_MPPR, mpp_addr | PPC_MPPR_FETCH_WHOLE_TABLE);
1925 * A list of virtual cores for each physical CPU.
1926 * These are vcores that could run but their runner VCPU tasks are
1927 * (or may be) preempted.
1929 struct preempted_vcore_list {
1930 struct list_head list;
1934 static DEFINE_PER_CPU(struct preempted_vcore_list, preempted_vcores);
1936 static void init_vcore_lists(void)
1940 for_each_possible_cpu(cpu) {
1941 struct preempted_vcore_list *lp = &per_cpu(preempted_vcores, cpu);
1942 spin_lock_init(&lp->lock);
1943 INIT_LIST_HEAD(&lp->list);
1947 static void kvmppc_vcore_preempt(struct kvmppc_vcore *vc)
1949 struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores);
1951 vc->vcore_state = VCORE_PREEMPT;
1952 vc->pcpu = smp_processor_id();
1953 if (vc->num_threads < threads_per_subcore) {
1954 spin_lock(&lp->lock);
1955 list_add_tail(&vc->preempt_list, &lp->list);
1956 spin_unlock(&lp->lock);
1959 /* Start accumulating stolen time */
1960 kvmppc_core_start_stolen(vc);
1963 static void kvmppc_vcore_end_preempt(struct kvmppc_vcore *vc)
1965 struct preempted_vcore_list *lp;
1967 kvmppc_core_end_stolen(vc);
1968 if (!list_empty(&vc->preempt_list)) {
1969 lp = &per_cpu(preempted_vcores, vc->pcpu);
1970 spin_lock(&lp->lock);
1971 list_del_init(&vc->preempt_list);
1972 spin_unlock(&lp->lock);
1974 vc->vcore_state = VCORE_INACTIVE;
1978 * This stores information about the virtual cores currently
1979 * assigned to a physical core.
1983 int max_subcore_threads;
1985 int subcore_threads[MAX_SUBCORES];
1986 struct kvm *subcore_vm[MAX_SUBCORES];
1987 struct list_head vcs[MAX_SUBCORES];
1991 * This mapping means subcores 0 and 1 can use threads 0-3 and 4-7
1992 * respectively in 2-way micro-threading (split-core) mode.
1994 static int subcore_thread_map[MAX_SUBCORES] = { 0, 4, 2, 6 };
1996 static void init_core_info(struct core_info *cip, struct kvmppc_vcore *vc)
2000 memset(cip, 0, sizeof(*cip));
2001 cip->n_subcores = 1;
2002 cip->max_subcore_threads = vc->num_threads;
2003 cip->total_threads = vc->num_threads;
2004 cip->subcore_threads[0] = vc->num_threads;
2005 cip->subcore_vm[0] = vc->kvm;
2006 for (sub = 0; sub < MAX_SUBCORES; ++sub)
2007 INIT_LIST_HEAD(&cip->vcs[sub]);
2008 list_add_tail(&vc->preempt_list, &cip->vcs[0]);
2011 static bool subcore_config_ok(int n_subcores, int n_threads)
2013 /* Can only dynamically split if unsplit to begin with */
2014 if (n_subcores > 1 && threads_per_subcore < MAX_SMT_THREADS)
2016 if (n_subcores > MAX_SUBCORES)
2018 if (n_subcores > 1) {
2019 if (!(dynamic_mt_modes & 2))
2021 if (n_subcores > 2 && !(dynamic_mt_modes & 4))
2025 return n_subcores * roundup_pow_of_two(n_threads) <= MAX_SMT_THREADS;
2028 static void init_master_vcore(struct kvmppc_vcore *vc)
2030 vc->master_vcore = vc;
2031 vc->entry_exit_map = 0;
2033 vc->napping_threads = 0;
2034 vc->conferring_threads = 0;
2038 * See if the existing subcores can be split into 3 (or fewer) subcores
2039 * of at most two threads each, so we can fit in another vcore. This
2040 * assumes there are at most two subcores and at most 6 threads in total.
2042 static bool can_split_piggybacked_subcores(struct core_info *cip)
2047 int n_subcores = cip->n_subcores;
2048 struct kvmppc_vcore *vc, *vcnext;
2049 struct kvmppc_vcore *master_vc = NULL;
2051 for (sub = 0; sub < cip->n_subcores; ++sub) {
2052 if (cip->subcore_threads[sub] <= 2)
2057 vc = list_first_entry(&cip->vcs[sub], struct kvmppc_vcore,
2059 if (vc->num_threads > 2)
2061 n_subcores += (cip->subcore_threads[sub] - 1) >> 1;
2063 if (n_subcores > 3 || large_sub < 0)
2067 * Seems feasible, so go through and move vcores to new subcores.
2068 * Note that when we have two or more vcores in one subcore,
2069 * all those vcores must have only one thread each.
2071 new_sub = cip->n_subcores;
2074 list_for_each_entry_safe(vc, vcnext, &cip->vcs[sub], preempt_list) {
2076 list_del(&vc->preempt_list);
2077 list_add_tail(&vc->preempt_list, &cip->vcs[new_sub]);
2078 /* vc->num_threads must be 1 */
2079 if (++cip->subcore_threads[new_sub] == 1) {
2080 cip->subcore_vm[new_sub] = vc->kvm;
2081 init_master_vcore(vc);
2085 vc->master_vcore = master_vc;
2089 thr += vc->num_threads;
2091 cip->subcore_threads[large_sub] = 2;
2092 cip->max_subcore_threads = 2;
2097 static bool can_dynamic_split(struct kvmppc_vcore *vc, struct core_info *cip)
2099 int n_threads = vc->num_threads;
2102 if (!cpu_has_feature(CPU_FTR_ARCH_207S))
2105 if (n_threads < cip->max_subcore_threads)
2106 n_threads = cip->max_subcore_threads;
2107 if (subcore_config_ok(cip->n_subcores + 1, n_threads)) {
2108 cip->max_subcore_threads = n_threads;
2109 } else if (cip->n_subcores <= 2 && cip->total_threads <= 6 &&
2110 vc->num_threads <= 2) {
2112 * We may be able to fit another subcore in by
2113 * splitting an existing subcore with 3 or 4
2114 * threads into two 2-thread subcores, or one
2115 * with 5 or 6 threads into three subcores.
2116 * We can only do this if those subcores have
2117 * piggybacked virtual cores.
2119 if (!can_split_piggybacked_subcores(cip))
2125 sub = cip->n_subcores;
2127 cip->total_threads += vc->num_threads;
2128 cip->subcore_threads[sub] = vc->num_threads;
2129 cip->subcore_vm[sub] = vc->kvm;
2130 init_master_vcore(vc);
2131 list_del(&vc->preempt_list);
2132 list_add_tail(&vc->preempt_list, &cip->vcs[sub]);
2137 static bool can_piggyback_subcore(struct kvmppc_vcore *pvc,
2138 struct core_info *cip, int sub)
2140 struct kvmppc_vcore *vc;
2143 vc = list_first_entry(&cip->vcs[sub], struct kvmppc_vcore,
2146 /* require same VM and same per-core reg values */
2147 if (pvc->kvm != vc->kvm ||
2148 pvc->tb_offset != vc->tb_offset ||
2149 pvc->pcr != vc->pcr ||
2150 pvc->lpcr != vc->lpcr)
2153 /* P8 guest with > 1 thread per core would see wrong TIR value */
2154 if (cpu_has_feature(CPU_FTR_ARCH_207S) &&
2155 (vc->num_threads > 1 || pvc->num_threads > 1))
2158 n_thr = cip->subcore_threads[sub] + pvc->num_threads;
2159 if (n_thr > cip->max_subcore_threads) {
2160 if (!subcore_config_ok(cip->n_subcores, n_thr))
2162 cip->max_subcore_threads = n_thr;
2165 cip->total_threads += pvc->num_threads;
2166 cip->subcore_threads[sub] = n_thr;
2167 pvc->master_vcore = vc;
2168 list_del(&pvc->preempt_list);
2169 list_add_tail(&pvc->preempt_list, &cip->vcs[sub]);
2175 * Work out whether it is possible to piggyback the execution of
2176 * vcore *pvc onto the execution of the other vcores described in *cip.
2178 static bool can_piggyback(struct kvmppc_vcore *pvc, struct core_info *cip,
2183 if (cip->total_threads + pvc->num_threads > target_threads)
2185 for (sub = 0; sub < cip->n_subcores; ++sub)
2186 if (cip->subcore_threads[sub] &&
2187 can_piggyback_subcore(pvc, cip, sub))
2190 if (can_dynamic_split(pvc, cip))
2196 static void prepare_threads(struct kvmppc_vcore *vc)
2198 struct kvm_vcpu *vcpu, *vnext;
2200 list_for_each_entry_safe(vcpu, vnext, &vc->runnable_threads,
2202 if (signal_pending(vcpu->arch.run_task))
2203 vcpu->arch.ret = -EINTR;
2204 else if (vcpu->arch.vpa.update_pending ||
2205 vcpu->arch.slb_shadow.update_pending ||
2206 vcpu->arch.dtl.update_pending)
2207 vcpu->arch.ret = RESUME_GUEST;
2210 kvmppc_remove_runnable(vc, vcpu);
2211 wake_up(&vcpu->arch.cpu_run);
2215 static void collect_piggybacks(struct core_info *cip, int target_threads)
2217 struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores);
2218 struct kvmppc_vcore *pvc, *vcnext;
2220 spin_lock(&lp->lock);
2221 list_for_each_entry_safe(pvc, vcnext, &lp->list, preempt_list) {
2222 if (!spin_trylock(&pvc->lock))
2224 prepare_threads(pvc);
2225 if (!pvc->n_runnable) {
2226 list_del_init(&pvc->preempt_list);
2227 if (pvc->runner == NULL) {
2228 pvc->vcore_state = VCORE_INACTIVE;
2229 kvmppc_core_end_stolen(pvc);
2231 spin_unlock(&pvc->lock);
2234 if (!can_piggyback(pvc, cip, target_threads)) {
2235 spin_unlock(&pvc->lock);
2238 kvmppc_core_end_stolen(pvc);
2239 pvc->vcore_state = VCORE_PIGGYBACK;
2240 if (cip->total_threads >= target_threads)
2243 spin_unlock(&lp->lock);
2246 static void post_guest_process(struct kvmppc_vcore *vc, bool is_master)
2248 int still_running = 0;
2251 struct kvm_vcpu *vcpu, *vnext;
2253 spin_lock(&vc->lock);
2255 list_for_each_entry_safe(vcpu, vnext, &vc->runnable_threads,
2257 /* cancel pending dec exception if dec is positive */
2258 if (now < vcpu->arch.dec_expires &&
2259 kvmppc_core_pending_dec(vcpu))
2260 kvmppc_core_dequeue_dec(vcpu);
2262 trace_kvm_guest_exit(vcpu);
2265 if (vcpu->arch.trap)
2266 ret = kvmppc_handle_exit_hv(vcpu->arch.kvm_run, vcpu,
2267 vcpu->arch.run_task);
2269 vcpu->arch.ret = ret;
2270 vcpu->arch.trap = 0;
2272 if (is_kvmppc_resume_guest(vcpu->arch.ret)) {
2273 if (vcpu->arch.pending_exceptions)
2274 kvmppc_core_prepare_to_enter(vcpu);
2275 if (vcpu->arch.ceded)
2276 kvmppc_set_timer(vcpu);
2280 kvmppc_remove_runnable(vc, vcpu);
2281 wake_up(&vcpu->arch.cpu_run);
2284 list_del_init(&vc->preempt_list);
2286 if (still_running > 0) {
2287 kvmppc_vcore_preempt(vc);
2288 } else if (vc->runner) {
2289 vc->vcore_state = VCORE_PREEMPT;
2290 kvmppc_core_start_stolen(vc);
2292 vc->vcore_state = VCORE_INACTIVE;
2294 if (vc->n_runnable > 0 && vc->runner == NULL) {
2295 /* make sure there's a candidate runner awake */
2296 vcpu = list_first_entry(&vc->runnable_threads,
2297 struct kvm_vcpu, arch.run_list);
2298 wake_up(&vcpu->arch.cpu_run);
2301 spin_unlock(&vc->lock);
2305 * Run a set of guest threads on a physical core.
2306 * Called with vc->lock held.
2308 static noinline void kvmppc_run_core(struct kvmppc_vcore *vc)
2310 struct kvm_vcpu *vcpu, *vnext;
2313 struct core_info core_info;
2314 struct kvmppc_vcore *pvc, *vcnext;
2315 struct kvm_split_mode split_info, *sip;
2316 int split, subcore_size, active;
2319 unsigned long cmd_bit, stat_bit;
2324 * Remove from the list any threads that have a signal pending
2325 * or need a VPA update done
2327 prepare_threads(vc);
2329 /* if the runner is no longer runnable, let the caller pick a new one */
2330 if (vc->runner->arch.state != KVMPPC_VCPU_RUNNABLE)
2336 init_master_vcore(vc);
2337 vc->preempt_tb = TB_NIL;
2340 * Make sure we are running on primary threads, and that secondary
2341 * threads are offline. Also check if the number of threads in this
2342 * guest are greater than the current system threads per guest.
2344 if ((threads_per_core > 1) &&
2345 ((vc->num_threads > threads_per_subcore) || !on_primary_thread())) {
2346 list_for_each_entry_safe(vcpu, vnext, &vc->runnable_threads,
2348 vcpu->arch.ret = -EBUSY;
2349 kvmppc_remove_runnable(vc, vcpu);
2350 wake_up(&vcpu->arch.cpu_run);
2356 * See if we could run any other vcores on the physical core
2357 * along with this one.
2359 init_core_info(&core_info, vc);
2360 pcpu = smp_processor_id();
2361 target_threads = threads_per_subcore;
2362 if (target_smt_mode && target_smt_mode < target_threads)
2363 target_threads = target_smt_mode;
2364 if (vc->num_threads < target_threads)
2365 collect_piggybacks(&core_info, target_threads);
2367 /* Decide on micro-threading (split-core) mode */
2368 subcore_size = threads_per_subcore;
2369 cmd_bit = stat_bit = 0;
2370 split = core_info.n_subcores;
2373 /* threads_per_subcore must be MAX_SMT_THREADS (8) here */
2374 if (split == 2 && (dynamic_mt_modes & 2)) {
2375 cmd_bit = HID0_POWER8_1TO2LPAR;
2376 stat_bit = HID0_POWER8_2LPARMODE;
2379 cmd_bit = HID0_POWER8_1TO4LPAR;
2380 stat_bit = HID0_POWER8_4LPARMODE;
2382 subcore_size = MAX_SMT_THREADS / split;
2384 memset(&split_info, 0, sizeof(split_info));
2385 split_info.rpr = mfspr(SPRN_RPR);
2386 split_info.pmmar = mfspr(SPRN_PMMAR);
2387 split_info.ldbar = mfspr(SPRN_LDBAR);
2388 split_info.subcore_size = subcore_size;
2389 for (sub = 0; sub < core_info.n_subcores; ++sub)
2390 split_info.master_vcs[sub] =
2391 list_first_entry(&core_info.vcs[sub],
2392 struct kvmppc_vcore, preempt_list);
2393 /* order writes to split_info before kvm_split_mode pointer */
2396 pcpu = smp_processor_id();
2397 for (thr = 0; thr < threads_per_subcore; ++thr)
2398 paca[pcpu + thr].kvm_hstate.kvm_split_mode = sip;
2400 /* Initiate micro-threading (split-core) if required */
2402 unsigned long hid0 = mfspr(SPRN_HID0);
2404 hid0 |= cmd_bit | HID0_POWER8_DYNLPARDIS;
2406 mtspr(SPRN_HID0, hid0);
2409 hid0 = mfspr(SPRN_HID0);
2410 if (hid0 & stat_bit)
2416 /* Start all the threads */
2418 for (sub = 0; sub < core_info.n_subcores; ++sub) {
2419 thr = subcore_thread_map[sub];
2422 list_for_each_entry(pvc, &core_info.vcs[sub], preempt_list) {
2423 pvc->pcpu = pcpu + thr;
2424 list_for_each_entry(vcpu, &pvc->runnable_threads,
2426 kvmppc_start_thread(vcpu, pvc);
2427 kvmppc_create_dtl_entry(vcpu, pvc);
2428 trace_kvm_guest_enter(vcpu);
2429 if (!vcpu->arch.ptid)
2431 active |= 1 << (thr + vcpu->arch.ptid);
2434 * We need to start the first thread of each subcore
2435 * even if it doesn't have a vcpu.
2437 if (pvc->master_vcore == pvc && !thr0_done)
2438 kvmppc_start_thread(NULL, pvc);
2439 thr += pvc->num_threads;
2444 * Ensure that split_info.do_nap is set after setting
2445 * the vcore pointer in the PACA of the secondaries.
2449 split_info.do_nap = 1; /* ask secondaries to nap when done */
2452 * When doing micro-threading, poke the inactive threads as well.
2453 * This gets them to the nap instruction after kvm_do_nap,
2454 * which reduces the time taken to unsplit later.
2457 for (thr = 1; thr < threads_per_subcore; ++thr)
2458 if (!(active & (1 << thr)))
2459 kvmppc_ipi_thread(pcpu + thr);
2461 vc->vcore_state = VCORE_RUNNING;
2464 trace_kvmppc_run_core(vc, 0);
2466 for (sub = 0; sub < core_info.n_subcores; ++sub)
2467 list_for_each_entry(pvc, &core_info.vcs[sub], preempt_list)
2468 spin_unlock(&pvc->lock);
2472 srcu_idx = srcu_read_lock(&vc->kvm->srcu);
2474 if (vc->mpp_buffer_is_valid)
2475 kvmppc_start_restoring_l2_cache(vc);
2477 __kvmppc_vcore_entry();
2480 kvmppc_start_saving_l2_cache(vc);
2482 srcu_read_unlock(&vc->kvm->srcu, srcu_idx);
2484 spin_lock(&vc->lock);
2485 /* prevent other vcpu threads from doing kvmppc_start_thread() now */
2486 vc->vcore_state = VCORE_EXITING;
2488 /* wait for secondary threads to finish writing their state to memory */
2489 kvmppc_wait_for_nap();
2491 /* Return to whole-core mode if we split the core earlier */
2493 unsigned long hid0 = mfspr(SPRN_HID0);
2494 unsigned long loops = 0;
2496 hid0 &= ~HID0_POWER8_DYNLPARDIS;
2497 stat_bit = HID0_POWER8_2LPARMODE | HID0_POWER8_4LPARMODE;
2499 mtspr(SPRN_HID0, hid0);
2502 hid0 = mfspr(SPRN_HID0);
2503 if (!(hid0 & stat_bit))
2508 split_info.do_nap = 0;
2511 /* Let secondaries go back to the offline loop */
2512 for (i = 0; i < threads_per_subcore; ++i) {
2513 kvmppc_release_hwthread(pcpu + i);
2514 if (sip && sip->napped[i])
2515 kvmppc_ipi_thread(pcpu + i);
2518 spin_unlock(&vc->lock);
2520 /* make sure updates to secondary vcpu structs are visible now */
2524 for (sub = 0; sub < core_info.n_subcores; ++sub)
2525 list_for_each_entry_safe(pvc, vcnext, &core_info.vcs[sub],
2527 post_guest_process(pvc, pvc == vc);
2529 spin_lock(&vc->lock);
2533 vc->vcore_state = VCORE_INACTIVE;
2534 trace_kvmppc_run_core(vc, 1);
2538 * Wait for some other vcpu thread to execute us, and
2539 * wake us up when we need to handle something in the host.
2541 static void kvmppc_wait_for_exec(struct kvmppc_vcore *vc,
2542 struct kvm_vcpu *vcpu, int wait_state)
2546 prepare_to_wait(&vcpu->arch.cpu_run, &wait, wait_state);
2547 if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) {
2548 spin_unlock(&vc->lock);
2550 spin_lock(&vc->lock);
2552 finish_wait(&vcpu->arch.cpu_run, &wait);
2556 * All the vcpus in this vcore are idle, so wait for a decrementer
2557 * or external interrupt to one of the vcpus. vc->lock is held.
2559 static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
2561 struct kvm_vcpu *vcpu;
2566 prepare_to_wait(&vc->wq, &wait, TASK_INTERRUPTIBLE);
2569 * Check one last time for pending exceptions and ceded state after
2570 * we put ourselves on the wait queue
2572 list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) {
2573 if (vcpu->arch.pending_exceptions || !vcpu->arch.ceded) {
2580 finish_wait(&vc->wq, &wait);
2584 vc->vcore_state = VCORE_SLEEPING;
2585 trace_kvmppc_vcore_blocked(vc, 0);
2586 spin_unlock(&vc->lock);
2588 finish_wait(&vc->wq, &wait);
2589 spin_lock(&vc->lock);
2590 vc->vcore_state = VCORE_INACTIVE;
2591 trace_kvmppc_vcore_blocked(vc, 1);
2594 static int kvmppc_run_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
2597 struct kvmppc_vcore *vc;
2598 struct kvm_vcpu *v, *vn;
2600 trace_kvmppc_run_vcpu_enter(vcpu);
2602 kvm_run->exit_reason = 0;
2603 vcpu->arch.ret = RESUME_GUEST;
2604 vcpu->arch.trap = 0;
2605 kvmppc_update_vpas(vcpu);
2608 * Synchronize with other threads in this virtual core
2610 vc = vcpu->arch.vcore;
2611 spin_lock(&vc->lock);
2612 vcpu->arch.ceded = 0;
2613 vcpu->arch.run_task = current;
2614 vcpu->arch.kvm_run = kvm_run;
2615 vcpu->arch.stolen_logged = vcore_stolen_time(vc, mftb());
2616 vcpu->arch.state = KVMPPC_VCPU_RUNNABLE;
2617 vcpu->arch.busy_preempt = TB_NIL;
2618 list_add_tail(&vcpu->arch.run_list, &vc->runnable_threads);
2622 * This happens the first time this is called for a vcpu.
2623 * If the vcore is already running, we may be able to start
2624 * this thread straight away and have it join in.
2626 if (!signal_pending(current)) {
2627 if (vc->vcore_state == VCORE_PIGGYBACK) {
2628 struct kvmppc_vcore *mvc = vc->master_vcore;
2629 if (spin_trylock(&mvc->lock)) {
2630 if (mvc->vcore_state == VCORE_RUNNING &&
2631 !VCORE_IS_EXITING(mvc)) {
2632 kvmppc_create_dtl_entry(vcpu, vc);
2633 kvmppc_start_thread(vcpu, vc);
2634 trace_kvm_guest_enter(vcpu);
2636 spin_unlock(&mvc->lock);
2638 } else if (vc->vcore_state == VCORE_RUNNING &&
2639 !VCORE_IS_EXITING(vc)) {
2640 kvmppc_create_dtl_entry(vcpu, vc);
2641 kvmppc_start_thread(vcpu, vc);
2642 trace_kvm_guest_enter(vcpu);
2643 } else if (vc->vcore_state == VCORE_SLEEPING) {
2649 while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
2650 !signal_pending(current)) {
2651 if (vc->vcore_state == VCORE_PREEMPT && vc->runner == NULL)
2652 kvmppc_vcore_end_preempt(vc);
2654 if (vc->vcore_state != VCORE_INACTIVE) {
2655 kvmppc_wait_for_exec(vc, vcpu, TASK_INTERRUPTIBLE);
2658 list_for_each_entry_safe(v, vn, &vc->runnable_threads,
2660 kvmppc_core_prepare_to_enter(v);
2661 if (signal_pending(v->arch.run_task)) {
2662 kvmppc_remove_runnable(vc, v);
2663 v->stat.signal_exits++;
2664 v->arch.kvm_run->exit_reason = KVM_EXIT_INTR;
2665 v->arch.ret = -EINTR;
2666 wake_up(&v->arch.cpu_run);
2669 if (!vc->n_runnable || vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
2672 list_for_each_entry(v, &vc->runnable_threads, arch.run_list) {
2673 if (!v->arch.pending_exceptions)
2674 n_ceded += v->arch.ceded;
2679 if (n_ceded == vc->n_runnable) {
2680 kvmppc_vcore_blocked(vc);
2681 } else if (need_resched()) {
2682 kvmppc_vcore_preempt(vc);
2683 /* Let something else run */
2684 cond_resched_lock(&vc->lock);
2685 if (vc->vcore_state == VCORE_PREEMPT)
2686 kvmppc_vcore_end_preempt(vc);
2688 kvmppc_run_core(vc);
2693 while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
2694 (vc->vcore_state == VCORE_RUNNING ||
2695 vc->vcore_state == VCORE_EXITING))
2696 kvmppc_wait_for_exec(vc, vcpu, TASK_UNINTERRUPTIBLE);
2698 if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) {
2699 kvmppc_remove_runnable(vc, vcpu);
2700 vcpu->stat.signal_exits++;
2701 kvm_run->exit_reason = KVM_EXIT_INTR;
2702 vcpu->arch.ret = -EINTR;
2705 if (vc->n_runnable && vc->vcore_state == VCORE_INACTIVE) {
2706 /* Wake up some vcpu to run the core */
2707 v = list_first_entry(&vc->runnable_threads,
2708 struct kvm_vcpu, arch.run_list);
2709 wake_up(&v->arch.cpu_run);
2712 trace_kvmppc_run_vcpu_exit(vcpu, kvm_run);
2713 spin_unlock(&vc->lock);
2714 return vcpu->arch.ret;
2717 static int kvmppc_vcpu_run_hv(struct kvm_run *run, struct kvm_vcpu *vcpu)
2722 if (!vcpu->arch.sane) {
2723 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
2727 kvmppc_core_prepare_to_enter(vcpu);
2729 /* No need to go into the guest when all we'll do is come back out */
2730 if (signal_pending(current)) {
2731 run->exit_reason = KVM_EXIT_INTR;
2735 atomic_inc(&vcpu->kvm->arch.vcpus_running);
2736 /* Order vcpus_running vs. hpte_setup_done, see kvmppc_alloc_reset_hpt */
2739 /* On the first time here, set up HTAB and VRMA */
2740 if (!vcpu->kvm->arch.hpte_setup_done) {
2741 r = kvmppc_hv_setup_htab_rma(vcpu);
2746 flush_fp_to_thread(current);
2747 flush_altivec_to_thread(current);
2748 flush_vsx_to_thread(current);
2749 vcpu->arch.wqp = &vcpu->arch.vcore->wq;
2750 vcpu->arch.pgdir = current->mm->pgd;
2751 vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
2754 r = kvmppc_run_vcpu(run, vcpu);
2756 if (run->exit_reason == KVM_EXIT_PAPR_HCALL &&
2757 !(vcpu->arch.shregs.msr & MSR_PR)) {
2758 trace_kvm_hcall_enter(vcpu);
2759 r = kvmppc_pseries_do_hcall(vcpu);
2760 trace_kvm_hcall_exit(vcpu, r);
2761 kvmppc_core_prepare_to_enter(vcpu);
2762 } else if (r == RESUME_PAGE_FAULT) {
2763 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
2764 r = kvmppc_book3s_hv_page_fault(run, vcpu,
2765 vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
2766 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
2768 } while (is_kvmppc_resume_guest(r));
2771 vcpu->arch.state = KVMPPC_VCPU_NOTREADY;
2772 atomic_dec(&vcpu->kvm->arch.vcpus_running);
2776 static void kvmppc_add_seg_page_size(struct kvm_ppc_one_seg_page_size **sps,
2779 struct mmu_psize_def *def = &mmu_psize_defs[linux_psize];
2783 (*sps)->page_shift = def->shift;
2784 (*sps)->slb_enc = def->sllp;
2785 (*sps)->enc[0].page_shift = def->shift;
2786 (*sps)->enc[0].pte_enc = def->penc[linux_psize];
2788 * Add 16MB MPSS support if host supports it
2790 if (linux_psize != MMU_PAGE_16M && def->penc[MMU_PAGE_16M] != -1) {
2791 (*sps)->enc[1].page_shift = 24;
2792 (*sps)->enc[1].pte_enc = def->penc[MMU_PAGE_16M];
2797 static int kvm_vm_ioctl_get_smmu_info_hv(struct kvm *kvm,
2798 struct kvm_ppc_smmu_info *info)
2800 struct kvm_ppc_one_seg_page_size *sps;
2802 info->flags = KVM_PPC_PAGE_SIZES_REAL;
2803 if (mmu_has_feature(MMU_FTR_1T_SEGMENT))
2804 info->flags |= KVM_PPC_1T_SEGMENTS;
2805 info->slb_size = mmu_slb_size;
2807 /* We only support these sizes for now, and no muti-size segments */
2808 sps = &info->sps[0];
2809 kvmppc_add_seg_page_size(&sps, MMU_PAGE_4K);
2810 kvmppc_add_seg_page_size(&sps, MMU_PAGE_64K);
2811 kvmppc_add_seg_page_size(&sps, MMU_PAGE_16M);
2817 * Get (and clear) the dirty memory log for a memory slot.
2819 static int kvm_vm_ioctl_get_dirty_log_hv(struct kvm *kvm,
2820 struct kvm_dirty_log *log)
2822 struct kvm_memslots *slots;
2823 struct kvm_memory_slot *memslot;
2827 mutex_lock(&kvm->slots_lock);
2830 if (log->slot >= KVM_USER_MEM_SLOTS)
2833 slots = kvm_memslots(kvm);
2834 memslot = id_to_memslot(slots, log->slot);
2836 if (!memslot->dirty_bitmap)
2839 n = kvm_dirty_bitmap_bytes(memslot);
2840 memset(memslot->dirty_bitmap, 0, n);
2842 r = kvmppc_hv_get_dirty_log(kvm, memslot, memslot->dirty_bitmap);
2847 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
2852 mutex_unlock(&kvm->slots_lock);
2856 static void kvmppc_core_free_memslot_hv(struct kvm_memory_slot *free,
2857 struct kvm_memory_slot *dont)
2859 if (!dont || free->arch.rmap != dont->arch.rmap) {
2860 vfree(free->arch.rmap);
2861 free->arch.rmap = NULL;
2865 static int kvmppc_core_create_memslot_hv(struct kvm_memory_slot *slot,
2866 unsigned long npages)
2868 slot->arch.rmap = vzalloc(npages * sizeof(*slot->arch.rmap));
2869 if (!slot->arch.rmap)
2875 static int kvmppc_core_prepare_memory_region_hv(struct kvm *kvm,
2876 struct kvm_memory_slot *memslot,
2877 const struct kvm_userspace_memory_region *mem)
2882 static void kvmppc_core_commit_memory_region_hv(struct kvm *kvm,
2883 const struct kvm_userspace_memory_region *mem,
2884 const struct kvm_memory_slot *old,
2885 const struct kvm_memory_slot *new)
2887 unsigned long npages = mem->memory_size >> PAGE_SHIFT;
2888 struct kvm_memslots *slots;
2889 struct kvm_memory_slot *memslot;
2891 if (npages && old->npages) {
2893 * If modifying a memslot, reset all the rmap dirty bits.
2894 * If this is a new memslot, we don't need to do anything
2895 * since the rmap array starts out as all zeroes,
2896 * i.e. no pages are dirty.
2898 slots = kvm_memslots(kvm);
2899 memslot = id_to_memslot(slots, mem->slot);
2900 kvmppc_hv_get_dirty_log(kvm, memslot, NULL);
2905 * Update LPCR values in kvm->arch and in vcores.
2906 * Caller must hold kvm->lock.
2908 void kvmppc_update_lpcr(struct kvm *kvm, unsigned long lpcr, unsigned long mask)
2913 if ((kvm->arch.lpcr & mask) == lpcr)
2916 kvm->arch.lpcr = (kvm->arch.lpcr & ~mask) | lpcr;
2918 for (i = 0; i < KVM_MAX_VCORES; ++i) {
2919 struct kvmppc_vcore *vc = kvm->arch.vcores[i];
2922 spin_lock(&vc->lock);
2923 vc->lpcr = (vc->lpcr & ~mask) | lpcr;
2924 spin_unlock(&vc->lock);
2925 if (++cores_done >= kvm->arch.online_vcores)
2930 static void kvmppc_mmu_destroy_hv(struct kvm_vcpu *vcpu)
2935 static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu)
2938 struct kvm *kvm = vcpu->kvm;
2940 struct kvm_memory_slot *memslot;
2941 struct vm_area_struct *vma;
2942 unsigned long lpcr = 0, senc;
2943 unsigned long psize, porder;
2946 mutex_lock(&kvm->lock);
2947 if (kvm->arch.hpte_setup_done)
2948 goto out; /* another vcpu beat us to it */
2950 /* Allocate hashed page table (if not done already) and reset it */
2951 if (!kvm->arch.hpt_virt) {
2952 err = kvmppc_alloc_hpt(kvm, NULL);
2954 pr_err("KVM: Couldn't alloc HPT\n");
2959 /* Look up the memslot for guest physical address 0 */
2960 srcu_idx = srcu_read_lock(&kvm->srcu);
2961 memslot = gfn_to_memslot(kvm, 0);
2963 /* We must have some memory at 0 by now */
2965 if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID))
2968 /* Look up the VMA for the start of this memory slot */
2969 hva = memslot->userspace_addr;
2970 down_read(¤t->mm->mmap_sem);
2971 vma = find_vma(current->mm, hva);
2972 if (!vma || vma->vm_start > hva || (vma->vm_flags & VM_IO))
2975 psize = vma_kernel_pagesize(vma);
2976 porder = __ilog2(psize);
2978 up_read(¤t->mm->mmap_sem);
2980 /* We can handle 4k, 64k or 16M pages in the VRMA */
2982 if (!(psize == 0x1000 || psize == 0x10000 ||
2983 psize == 0x1000000))
2986 /* Update VRMASD field in the LPCR */
2987 senc = slb_pgsize_encoding(psize);
2988 kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T |
2989 (VRMA_VSID << SLB_VSID_SHIFT_1T);
2990 /* the -4 is to account for senc values starting at 0x10 */
2991 lpcr = senc << (LPCR_VRMASD_SH - 4);
2993 /* Create HPTEs in the hash page table for the VRMA */
2994 kvmppc_map_vrma(vcpu, memslot, porder);
2996 kvmppc_update_lpcr(kvm, lpcr, LPCR_VRMASD);
2998 /* Order updates to kvm->arch.lpcr etc. vs. hpte_setup_done */
3000 kvm->arch.hpte_setup_done = 1;
3003 srcu_read_unlock(&kvm->srcu, srcu_idx);
3005 mutex_unlock(&kvm->lock);
3009 up_read(¤t->mm->mmap_sem);
3013 static int kvmppc_core_init_vm_hv(struct kvm *kvm)
3015 unsigned long lpcr, lpid;
3018 /* Allocate the guest's logical partition ID */
3020 lpid = kvmppc_alloc_lpid();
3023 kvm->arch.lpid = lpid;
3026 * Since we don't flush the TLB when tearing down a VM,
3027 * and this lpid might have previously been used,
3028 * make sure we flush on each core before running the new VM.
3030 cpumask_setall(&kvm->arch.need_tlb_flush);
3032 /* Start out with the default set of hcalls enabled */
3033 memcpy(kvm->arch.enabled_hcalls, default_enabled_hcalls,
3034 sizeof(kvm->arch.enabled_hcalls));
3036 kvm->arch.host_sdr1 = mfspr(SPRN_SDR1);
3038 /* Init LPCR for virtual RMA mode */
3039 kvm->arch.host_lpid = mfspr(SPRN_LPID);
3040 kvm->arch.host_lpcr = lpcr = mfspr(SPRN_LPCR);
3041 lpcr &= LPCR_PECE | LPCR_LPES;
3042 lpcr |= (4UL << LPCR_DPFD_SH) | LPCR_HDICE |
3043 LPCR_VPM0 | LPCR_VPM1;
3044 kvm->arch.vrma_slb_v = SLB_VSID_B_1T |
3045 (VRMA_VSID << SLB_VSID_SHIFT_1T);
3046 /* On POWER8 turn on online bit to enable PURR/SPURR */
3047 if (cpu_has_feature(CPU_FTR_ARCH_207S))
3049 kvm->arch.lpcr = lpcr;
3052 * Track that we now have a HV mode VM active. This blocks secondary
3053 * CPU threads from coming online.
3055 kvm_hv_vm_activated();
3058 * Create a debugfs directory for the VM
3060 snprintf(buf, sizeof(buf), "vm%d", current->pid);
3061 kvm->arch.debugfs_dir = debugfs_create_dir(buf, kvm_debugfs_dir);
3062 if (!IS_ERR_OR_NULL(kvm->arch.debugfs_dir))
3063 kvmppc_mmu_debugfs_init(kvm);
3068 static void kvmppc_free_vcores(struct kvm *kvm)
3072 for (i = 0; i < KVM_MAX_VCORES; ++i) {
3073 if (kvm->arch.vcores[i] && kvm->arch.vcores[i]->mpp_buffer) {
3074 struct kvmppc_vcore *vc = kvm->arch.vcores[i];
3075 free_pages((unsigned long)vc->mpp_buffer,
3078 kfree(kvm->arch.vcores[i]);
3080 kvm->arch.online_vcores = 0;
3083 static void kvmppc_core_destroy_vm_hv(struct kvm *kvm)
3085 debugfs_remove_recursive(kvm->arch.debugfs_dir);
3087 kvm_hv_vm_deactivated();
3089 kvmppc_free_vcores(kvm);
3091 kvmppc_free_hpt(kvm);
3094 /* We don't need to emulate any privileged instructions or dcbz */
3095 static int kvmppc_core_emulate_op_hv(struct kvm_run *run, struct kvm_vcpu *vcpu,
3096 unsigned int inst, int *advance)
3098 return EMULATE_FAIL;
3101 static int kvmppc_core_emulate_mtspr_hv(struct kvm_vcpu *vcpu, int sprn,
3104 return EMULATE_FAIL;
3107 static int kvmppc_core_emulate_mfspr_hv(struct kvm_vcpu *vcpu, int sprn,
3110 return EMULATE_FAIL;
3113 static int kvmppc_core_check_processor_compat_hv(void)
3115 if (!cpu_has_feature(CPU_FTR_HVMODE) ||
3116 !cpu_has_feature(CPU_FTR_ARCH_206))
3121 static long kvm_arch_vm_ioctl_hv(struct file *filp,
3122 unsigned int ioctl, unsigned long arg)
3124 struct kvm *kvm __maybe_unused = filp->private_data;
3125 void __user *argp = (void __user *)arg;
3130 case KVM_PPC_ALLOCATE_HTAB: {
3134 if (get_user(htab_order, (u32 __user *)argp))
3136 r = kvmppc_alloc_reset_hpt(kvm, &htab_order);
3140 if (put_user(htab_order, (u32 __user *)argp))
3146 case KVM_PPC_GET_HTAB_FD: {
3147 struct kvm_get_htab_fd ghf;
3150 if (copy_from_user(&ghf, argp, sizeof(ghf)))
3152 r = kvm_vm_ioctl_get_htab_fd(kvm, &ghf);
3164 * List of hcall numbers to enable by default.
3165 * For compatibility with old userspace, we enable by default
3166 * all hcalls that were implemented before the hcall-enabling
3167 * facility was added. Note this list should not include H_RTAS.
3169 static unsigned int default_hcall_list[] = {
3183 #ifdef CONFIG_KVM_XICS
3194 static void init_default_hcalls(void)
3199 for (i = 0; default_hcall_list[i]; ++i) {
3200 hcall = default_hcall_list[i];
3201 WARN_ON(!kvmppc_hcall_impl_hv(hcall));
3202 __set_bit(hcall / 4, default_enabled_hcalls);
3206 static struct kvmppc_ops kvm_ops_hv = {
3207 .get_sregs = kvm_arch_vcpu_ioctl_get_sregs_hv,
3208 .set_sregs = kvm_arch_vcpu_ioctl_set_sregs_hv,
3209 .get_one_reg = kvmppc_get_one_reg_hv,
3210 .set_one_reg = kvmppc_set_one_reg_hv,
3211 .vcpu_load = kvmppc_core_vcpu_load_hv,
3212 .vcpu_put = kvmppc_core_vcpu_put_hv,
3213 .set_msr = kvmppc_set_msr_hv,
3214 .vcpu_run = kvmppc_vcpu_run_hv,
3215 .vcpu_create = kvmppc_core_vcpu_create_hv,
3216 .vcpu_free = kvmppc_core_vcpu_free_hv,
3217 .check_requests = kvmppc_core_check_requests_hv,
3218 .get_dirty_log = kvm_vm_ioctl_get_dirty_log_hv,
3219 .flush_memslot = kvmppc_core_flush_memslot_hv,
3220 .prepare_memory_region = kvmppc_core_prepare_memory_region_hv,
3221 .commit_memory_region = kvmppc_core_commit_memory_region_hv,
3222 .unmap_hva = kvm_unmap_hva_hv,
3223 .unmap_hva_range = kvm_unmap_hva_range_hv,
3224 .age_hva = kvm_age_hva_hv,
3225 .test_age_hva = kvm_test_age_hva_hv,
3226 .set_spte_hva = kvm_set_spte_hva_hv,
3227 .mmu_destroy = kvmppc_mmu_destroy_hv,
3228 .free_memslot = kvmppc_core_free_memslot_hv,
3229 .create_memslot = kvmppc_core_create_memslot_hv,
3230 .init_vm = kvmppc_core_init_vm_hv,
3231 .destroy_vm = kvmppc_core_destroy_vm_hv,
3232 .get_smmu_info = kvm_vm_ioctl_get_smmu_info_hv,
3233 .emulate_op = kvmppc_core_emulate_op_hv,
3234 .emulate_mtspr = kvmppc_core_emulate_mtspr_hv,
3235 .emulate_mfspr = kvmppc_core_emulate_mfspr_hv,
3236 .fast_vcpu_kick = kvmppc_fast_vcpu_kick_hv,
3237 .arch_vm_ioctl = kvm_arch_vm_ioctl_hv,
3238 .hcall_implemented = kvmppc_hcall_impl_hv,
3241 static int kvmppc_book3s_init_hv(void)
3245 * FIXME!! Do we need to check on all cpus ?
3247 r = kvmppc_core_check_processor_compat_hv();
3251 kvm_ops_hv.owner = THIS_MODULE;
3252 kvmppc_hv_ops = &kvm_ops_hv;
3254 init_default_hcalls();
3258 r = kvmppc_mmu_hv_init();
3262 static void kvmppc_book3s_exit_hv(void)
3264 kvmppc_hv_ops = NULL;
3267 module_init(kvmppc_book3s_init_hv);
3268 module_exit(kvmppc_book3s_exit_hv);
3269 MODULE_LICENSE("GPL");
3270 MODULE_ALIAS_MISCDEV(KVM_MINOR);
3271 MODULE_ALIAS("devname:kvm");