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>
36 #include <asm/cputable.h>
37 #include <asm/cacheflush.h>
38 #include <asm/tlbflush.h>
39 #include <asm/uaccess.h>
41 #include <asm/kvm_ppc.h>
42 #include <asm/kvm_book3s.h>
43 #include <asm/mmu_context.h>
44 #include <asm/lppaca.h>
45 #include <asm/processor.h>
46 #include <asm/cputhreads.h>
48 #include <asm/hvcall.h>
49 #include <asm/switch_to.h>
51 #include <linux/gfp.h>
52 #include <linux/vmalloc.h>
53 #include <linux/highmem.h>
54 #include <linux/hugetlb.h>
56 /* #define EXIT_DEBUG */
57 /* #define EXIT_DEBUG_SIMPLE */
58 /* #define EXIT_DEBUG_INT */
60 /* Used to indicate that a guest page fault needs to be handled */
61 #define RESUME_PAGE_FAULT (RESUME_GUEST | RESUME_FLAG_ARCH1)
63 /* Used as a "null" value for timebase values */
64 #define TB_NIL (~(u64)0)
66 static void kvmppc_end_cede(struct kvm_vcpu *vcpu);
67 static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu);
69 void kvmppc_fast_vcpu_kick(struct kvm_vcpu *vcpu)
73 wait_queue_head_t *wqp;
75 wqp = kvm_arch_vcpu_wq(vcpu);
76 if (waitqueue_active(wqp)) {
77 wake_up_interruptible(wqp);
78 ++vcpu->stat.halt_wakeup;
83 /* CPU points to the first thread of the core */
84 if (cpu != me && cpu >= 0 && cpu < nr_cpu_ids) {
85 #ifdef CONFIG_KVM_XICS
86 int real_cpu = cpu + vcpu->arch.ptid;
87 if (paca[real_cpu].kvm_hstate.xics_phys)
88 xics_wake_cpu(real_cpu);
92 smp_send_reschedule(cpu);
98 * We use the vcpu_load/put functions to measure stolen time.
99 * Stolen time is counted as time when either the vcpu is able to
100 * run as part of a virtual core, but the task running the vcore
101 * is preempted or sleeping, or when the vcpu needs something done
102 * in the kernel by the task running the vcpu, but that task is
103 * preempted or sleeping. Those two things have to be counted
104 * separately, since one of the vcpu tasks will take on the job
105 * of running the core, and the other vcpu tasks in the vcore will
106 * sleep waiting for it to do that, but that sleep shouldn't count
109 * Hence we accumulate stolen time when the vcpu can run as part of
110 * a vcore using vc->stolen_tb, and the stolen time when the vcpu
111 * needs its task to do other things in the kernel (for example,
112 * service a page fault) in busy_stolen. We don't accumulate
113 * stolen time for a vcore when it is inactive, or for a vcpu
114 * when it is in state RUNNING or NOTREADY. NOTREADY is a bit of
115 * a misnomer; it means that the vcpu task is not executing in
116 * the KVM_VCPU_RUN ioctl, i.e. it is in userspace or elsewhere in
117 * the kernel. We don't have any way of dividing up that time
118 * between time that the vcpu is genuinely stopped, time that
119 * the task is actively working on behalf of the vcpu, and time
120 * that the task is preempted, so we don't count any of it as
123 * Updates to busy_stolen are protected by arch.tbacct_lock;
124 * updates to vc->stolen_tb are protected by the arch.tbacct_lock
125 * of the vcpu that has taken responsibility for running the vcore
126 * (i.e. vc->runner). The stolen times are measured in units of
127 * timebase ticks. (Note that the != TB_NIL checks below are
128 * purely defensive; they should never fail.)
131 void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
133 struct kvmppc_vcore *vc = vcpu->arch.vcore;
135 spin_lock(&vcpu->arch.tbacct_lock);
136 if (vc->runner == vcpu && vc->vcore_state != VCORE_INACTIVE &&
137 vc->preempt_tb != TB_NIL) {
138 vc->stolen_tb += mftb() - vc->preempt_tb;
139 vc->preempt_tb = TB_NIL;
141 if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST &&
142 vcpu->arch.busy_preempt != TB_NIL) {
143 vcpu->arch.busy_stolen += mftb() - vcpu->arch.busy_preempt;
144 vcpu->arch.busy_preempt = TB_NIL;
146 spin_unlock(&vcpu->arch.tbacct_lock);
149 void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
151 struct kvmppc_vcore *vc = vcpu->arch.vcore;
153 spin_lock(&vcpu->arch.tbacct_lock);
154 if (vc->runner == vcpu && vc->vcore_state != VCORE_INACTIVE)
155 vc->preempt_tb = mftb();
156 if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST)
157 vcpu->arch.busy_preempt = mftb();
158 spin_unlock(&vcpu->arch.tbacct_lock);
161 void kvmppc_set_msr(struct kvm_vcpu *vcpu, u64 msr)
163 vcpu->arch.shregs.msr = msr;
164 kvmppc_end_cede(vcpu);
167 void kvmppc_set_pvr(struct kvm_vcpu *vcpu, u32 pvr)
169 vcpu->arch.pvr = pvr;
172 void kvmppc_dump_regs(struct kvm_vcpu *vcpu)
176 pr_err("vcpu %p (%d):\n", vcpu, vcpu->vcpu_id);
177 pr_err("pc = %.16lx msr = %.16llx trap = %x\n",
178 vcpu->arch.pc, vcpu->arch.shregs.msr, vcpu->arch.trap);
179 for (r = 0; r < 16; ++r)
180 pr_err("r%2d = %.16lx r%d = %.16lx\n",
181 r, kvmppc_get_gpr(vcpu, r),
182 r+16, kvmppc_get_gpr(vcpu, r+16));
183 pr_err("ctr = %.16lx lr = %.16lx\n",
184 vcpu->arch.ctr, vcpu->arch.lr);
185 pr_err("srr0 = %.16llx srr1 = %.16llx\n",
186 vcpu->arch.shregs.srr0, vcpu->arch.shregs.srr1);
187 pr_err("sprg0 = %.16llx sprg1 = %.16llx\n",
188 vcpu->arch.shregs.sprg0, vcpu->arch.shregs.sprg1);
189 pr_err("sprg2 = %.16llx sprg3 = %.16llx\n",
190 vcpu->arch.shregs.sprg2, vcpu->arch.shregs.sprg3);
191 pr_err("cr = %.8x xer = %.16lx dsisr = %.8x\n",
192 vcpu->arch.cr, vcpu->arch.xer, vcpu->arch.shregs.dsisr);
193 pr_err("dar = %.16llx\n", vcpu->arch.shregs.dar);
194 pr_err("fault dar = %.16lx dsisr = %.8x\n",
195 vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
196 pr_err("SLB (%d entries):\n", vcpu->arch.slb_max);
197 for (r = 0; r < vcpu->arch.slb_max; ++r)
198 pr_err(" ESID = %.16llx VSID = %.16llx\n",
199 vcpu->arch.slb[r].orige, vcpu->arch.slb[r].origv);
200 pr_err("lpcr = %.16lx sdr1 = %.16lx last_inst = %.8x\n",
201 vcpu->kvm->arch.lpcr, vcpu->kvm->arch.sdr1,
202 vcpu->arch.last_inst);
205 struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id)
208 struct kvm_vcpu *v, *ret = NULL;
210 mutex_lock(&kvm->lock);
211 kvm_for_each_vcpu(r, v, kvm) {
212 if (v->vcpu_id == id) {
217 mutex_unlock(&kvm->lock);
221 static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa)
223 vpa->shared_proc = 1;
224 vpa->yield_count = 1;
227 static int set_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *v,
228 unsigned long addr, unsigned long len)
230 /* check address is cacheline aligned */
231 if (addr & (L1_CACHE_BYTES - 1))
233 spin_lock(&vcpu->arch.vpa_update_lock);
234 if (v->next_gpa != addr || v->len != len) {
236 v->len = addr ? len : 0;
237 v->update_pending = 1;
239 spin_unlock(&vcpu->arch.vpa_update_lock);
243 /* Length for a per-processor buffer is passed in at offset 4 in the buffer */
252 static int vpa_is_registered(struct kvmppc_vpa *vpap)
254 if (vpap->update_pending)
255 return vpap->next_gpa != 0;
256 return vpap->pinned_addr != NULL;
259 static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu,
261 unsigned long vcpuid, unsigned long vpa)
263 struct kvm *kvm = vcpu->kvm;
264 unsigned long len, nb;
266 struct kvm_vcpu *tvcpu;
269 struct kvmppc_vpa *vpap;
271 tvcpu = kvmppc_find_vcpu(kvm, vcpuid);
275 subfunc = (flags >> H_VPA_FUNC_SHIFT) & H_VPA_FUNC_MASK;
276 if (subfunc == H_VPA_REG_VPA || subfunc == H_VPA_REG_DTL ||
277 subfunc == H_VPA_REG_SLB) {
278 /* Registering new area - address must be cache-line aligned */
279 if ((vpa & (L1_CACHE_BYTES - 1)) || !vpa)
282 /* convert logical addr to kernel addr and read length */
283 va = kvmppc_pin_guest_page(kvm, vpa, &nb);
286 if (subfunc == H_VPA_REG_VPA)
287 len = ((struct reg_vpa *)va)->length.hword;
289 len = ((struct reg_vpa *)va)->length.word;
290 kvmppc_unpin_guest_page(kvm, va, vpa, false);
293 if (len > nb || len < sizeof(struct reg_vpa))
302 spin_lock(&tvcpu->arch.vpa_update_lock);
305 case H_VPA_REG_VPA: /* register VPA */
306 if (len < sizeof(struct lppaca))
308 vpap = &tvcpu->arch.vpa;
312 case H_VPA_REG_DTL: /* register DTL */
313 if (len < sizeof(struct dtl_entry))
315 len -= len % sizeof(struct dtl_entry);
317 /* Check that they have previously registered a VPA */
319 if (!vpa_is_registered(&tvcpu->arch.vpa))
322 vpap = &tvcpu->arch.dtl;
326 case H_VPA_REG_SLB: /* register SLB shadow buffer */
327 /* Check that they have previously registered a VPA */
329 if (!vpa_is_registered(&tvcpu->arch.vpa))
332 vpap = &tvcpu->arch.slb_shadow;
336 case H_VPA_DEREG_VPA: /* deregister VPA */
337 /* Check they don't still have a DTL or SLB buf registered */
339 if (vpa_is_registered(&tvcpu->arch.dtl) ||
340 vpa_is_registered(&tvcpu->arch.slb_shadow))
343 vpap = &tvcpu->arch.vpa;
347 case H_VPA_DEREG_DTL: /* deregister DTL */
348 vpap = &tvcpu->arch.dtl;
352 case H_VPA_DEREG_SLB: /* deregister SLB shadow buffer */
353 vpap = &tvcpu->arch.slb_shadow;
359 vpap->next_gpa = vpa;
361 vpap->update_pending = 1;
364 spin_unlock(&tvcpu->arch.vpa_update_lock);
369 static void kvmppc_update_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *vpap)
371 struct kvm *kvm = vcpu->kvm;
377 * We need to pin the page pointed to by vpap->next_gpa,
378 * but we can't call kvmppc_pin_guest_page under the lock
379 * as it does get_user_pages() and down_read(). So we
380 * have to drop the lock, pin the page, then get the lock
381 * again and check that a new area didn't get registered
385 gpa = vpap->next_gpa;
386 spin_unlock(&vcpu->arch.vpa_update_lock);
390 va = kvmppc_pin_guest_page(kvm, gpa, &nb);
391 spin_lock(&vcpu->arch.vpa_update_lock);
392 if (gpa == vpap->next_gpa)
394 /* sigh... unpin that one and try again */
396 kvmppc_unpin_guest_page(kvm, va, gpa, false);
399 vpap->update_pending = 0;
400 if (va && nb < vpap->len) {
402 * If it's now too short, it must be that userspace
403 * has changed the mappings underlying guest memory,
404 * so unregister the region.
406 kvmppc_unpin_guest_page(kvm, va, gpa, false);
409 if (vpap->pinned_addr)
410 kvmppc_unpin_guest_page(kvm, vpap->pinned_addr, vpap->gpa,
413 vpap->pinned_addr = va;
416 vpap->pinned_end = va + vpap->len;
419 static void kvmppc_update_vpas(struct kvm_vcpu *vcpu)
421 if (!(vcpu->arch.vpa.update_pending ||
422 vcpu->arch.slb_shadow.update_pending ||
423 vcpu->arch.dtl.update_pending))
426 spin_lock(&vcpu->arch.vpa_update_lock);
427 if (vcpu->arch.vpa.update_pending) {
428 kvmppc_update_vpa(vcpu, &vcpu->arch.vpa);
429 if (vcpu->arch.vpa.pinned_addr)
430 init_vpa(vcpu, vcpu->arch.vpa.pinned_addr);
432 if (vcpu->arch.dtl.update_pending) {
433 kvmppc_update_vpa(vcpu, &vcpu->arch.dtl);
434 vcpu->arch.dtl_ptr = vcpu->arch.dtl.pinned_addr;
435 vcpu->arch.dtl_index = 0;
437 if (vcpu->arch.slb_shadow.update_pending)
438 kvmppc_update_vpa(vcpu, &vcpu->arch.slb_shadow);
439 spin_unlock(&vcpu->arch.vpa_update_lock);
443 * Return the accumulated stolen time for the vcore up until `now'.
444 * The caller should hold the vcore lock.
446 static u64 vcore_stolen_time(struct kvmppc_vcore *vc, u64 now)
451 * If we are the task running the vcore, then since we hold
452 * the vcore lock, we can't be preempted, so stolen_tb/preempt_tb
453 * can't be updated, so we don't need the tbacct_lock.
454 * If the vcore is inactive, it can't become active (since we
455 * hold the vcore lock), so the vcpu load/put functions won't
456 * update stolen_tb/preempt_tb, and we don't need tbacct_lock.
458 if (vc->vcore_state != VCORE_INACTIVE &&
459 vc->runner->arch.run_task != current) {
460 spin_lock(&vc->runner->arch.tbacct_lock);
462 if (vc->preempt_tb != TB_NIL)
463 p += now - vc->preempt_tb;
464 spin_unlock(&vc->runner->arch.tbacct_lock);
471 static void kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu,
472 struct kvmppc_vcore *vc)
474 struct dtl_entry *dt;
476 unsigned long stolen;
477 unsigned long core_stolen;
480 dt = vcpu->arch.dtl_ptr;
481 vpa = vcpu->arch.vpa.pinned_addr;
483 core_stolen = vcore_stolen_time(vc, now);
484 stolen = core_stolen - vcpu->arch.stolen_logged;
485 vcpu->arch.stolen_logged = core_stolen;
486 spin_lock(&vcpu->arch.tbacct_lock);
487 stolen += vcpu->arch.busy_stolen;
488 vcpu->arch.busy_stolen = 0;
489 spin_unlock(&vcpu->arch.tbacct_lock);
492 memset(dt, 0, sizeof(struct dtl_entry));
493 dt->dispatch_reason = 7;
494 dt->processor_id = vc->pcpu + vcpu->arch.ptid;
496 dt->enqueue_to_dispatch_time = stolen;
497 dt->srr0 = kvmppc_get_pc(vcpu);
498 dt->srr1 = vcpu->arch.shregs.msr;
500 if (dt == vcpu->arch.dtl.pinned_end)
501 dt = vcpu->arch.dtl.pinned_addr;
502 vcpu->arch.dtl_ptr = dt;
503 /* order writing *dt vs. writing vpa->dtl_idx */
505 vpa->dtl_idx = ++vcpu->arch.dtl_index;
506 vcpu->arch.dtl.dirty = true;
509 int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
511 unsigned long req = kvmppc_get_gpr(vcpu, 3);
512 unsigned long target, ret = H_SUCCESS;
513 struct kvm_vcpu *tvcpu;
518 idx = srcu_read_lock(&vcpu->kvm->srcu);
519 ret = kvmppc_virtmode_h_enter(vcpu, kvmppc_get_gpr(vcpu, 4),
520 kvmppc_get_gpr(vcpu, 5),
521 kvmppc_get_gpr(vcpu, 6),
522 kvmppc_get_gpr(vcpu, 7));
523 srcu_read_unlock(&vcpu->kvm->srcu, idx);
528 target = kvmppc_get_gpr(vcpu, 4);
529 tvcpu = kvmppc_find_vcpu(vcpu->kvm, target);
534 tvcpu->arch.prodded = 1;
536 if (vcpu->arch.ceded) {
537 if (waitqueue_active(&vcpu->wq)) {
538 wake_up_interruptible(&vcpu->wq);
539 vcpu->stat.halt_wakeup++;
546 ret = do_h_register_vpa(vcpu, kvmppc_get_gpr(vcpu, 4),
547 kvmppc_get_gpr(vcpu, 5),
548 kvmppc_get_gpr(vcpu, 6));
551 if (list_empty(&vcpu->kvm->arch.rtas_tokens))
554 rc = kvmppc_rtas_hcall(vcpu);
561 /* Send the error out to userspace via KVM_RUN */
570 if (kvmppc_xics_enabled(vcpu)) {
571 ret = kvmppc_xics_hcall(vcpu, req);
577 kvmppc_set_gpr(vcpu, 3, ret);
578 vcpu->arch.hcall_needed = 0;
582 static int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
583 struct task_struct *tsk)
587 vcpu->stat.sum_exits++;
589 run->exit_reason = KVM_EXIT_UNKNOWN;
590 run->ready_for_interrupt_injection = 1;
591 switch (vcpu->arch.trap) {
592 /* We're good on these - the host merely wanted to get our attention */
593 case BOOK3S_INTERRUPT_HV_DECREMENTER:
594 vcpu->stat.dec_exits++;
597 case BOOK3S_INTERRUPT_EXTERNAL:
598 vcpu->stat.ext_intr_exits++;
601 case BOOK3S_INTERRUPT_PERFMON:
604 case BOOK3S_INTERRUPT_MACHINE_CHECK:
606 * Deliver a machine check interrupt to the guest.
607 * We have to do this, even if the host has handled the
608 * machine check, because machine checks use SRR0/1 and
609 * the interrupt might have trashed guest state in them.
611 kvmppc_book3s_queue_irqprio(vcpu,
612 BOOK3S_INTERRUPT_MACHINE_CHECK);
615 case BOOK3S_INTERRUPT_PROGRAM:
619 * Normally program interrupts are delivered directly
620 * to the guest by the hardware, but we can get here
621 * as a result of a hypervisor emulation interrupt
622 * (e40) getting turned into a 700 by BML RTAS.
624 flags = vcpu->arch.shregs.msr & 0x1f0000ull;
625 kvmppc_core_queue_program(vcpu, flags);
629 case BOOK3S_INTERRUPT_SYSCALL:
631 /* hcall - punt to userspace */
634 if (vcpu->arch.shregs.msr & MSR_PR) {
635 /* sc 1 from userspace - reflect to guest syscall */
636 kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_SYSCALL);
640 run->papr_hcall.nr = kvmppc_get_gpr(vcpu, 3);
641 for (i = 0; i < 9; ++i)
642 run->papr_hcall.args[i] = kvmppc_get_gpr(vcpu, 4 + i);
643 run->exit_reason = KVM_EXIT_PAPR_HCALL;
644 vcpu->arch.hcall_needed = 1;
649 * We get these next two if the guest accesses a page which it thinks
650 * it has mapped but which is not actually present, either because
651 * it is for an emulated I/O device or because the corresonding
652 * host page has been paged out. Any other HDSI/HISI interrupts
653 * have been handled already.
655 case BOOK3S_INTERRUPT_H_DATA_STORAGE:
656 r = RESUME_PAGE_FAULT;
658 case BOOK3S_INTERRUPT_H_INST_STORAGE:
659 vcpu->arch.fault_dar = kvmppc_get_pc(vcpu);
660 vcpu->arch.fault_dsisr = 0;
661 r = RESUME_PAGE_FAULT;
664 * This occurs if the guest executes an illegal instruction.
665 * We just generate a program interrupt to the guest, since
666 * we don't emulate any guest instructions at this stage.
668 case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
669 kvmppc_core_queue_program(vcpu, 0x80000);
673 kvmppc_dump_regs(vcpu);
674 printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n",
675 vcpu->arch.trap, kvmppc_get_pc(vcpu),
676 vcpu->arch.shregs.msr);
685 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
686 struct kvm_sregs *sregs)
690 sregs->pvr = vcpu->arch.pvr;
692 memset(sregs, 0, sizeof(struct kvm_sregs));
693 for (i = 0; i < vcpu->arch.slb_max; i++) {
694 sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige;
695 sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
701 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
702 struct kvm_sregs *sregs)
706 kvmppc_set_pvr(vcpu, sregs->pvr);
709 for (i = 0; i < vcpu->arch.slb_nr; i++) {
710 if (sregs->u.s.ppc64.slb[i].slbe & SLB_ESID_V) {
711 vcpu->arch.slb[j].orige = sregs->u.s.ppc64.slb[i].slbe;
712 vcpu->arch.slb[j].origv = sregs->u.s.ppc64.slb[i].slbv;
716 vcpu->arch.slb_max = j;
721 int kvmppc_get_one_reg(struct kvm_vcpu *vcpu, u64 id, union kvmppc_one_reg *val)
727 case KVM_REG_PPC_HIOR:
728 *val = get_reg_val(id, 0);
730 case KVM_REG_PPC_DABR:
731 *val = get_reg_val(id, vcpu->arch.dabr);
733 case KVM_REG_PPC_DSCR:
734 *val = get_reg_val(id, vcpu->arch.dscr);
736 case KVM_REG_PPC_PURR:
737 *val = get_reg_val(id, vcpu->arch.purr);
739 case KVM_REG_PPC_SPURR:
740 *val = get_reg_val(id, vcpu->arch.spurr);
742 case KVM_REG_PPC_AMR:
743 *val = get_reg_val(id, vcpu->arch.amr);
745 case KVM_REG_PPC_UAMOR:
746 *val = get_reg_val(id, vcpu->arch.uamor);
748 case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCRA:
749 i = id - KVM_REG_PPC_MMCR0;
750 *val = get_reg_val(id, vcpu->arch.mmcr[i]);
752 case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8:
753 i = id - KVM_REG_PPC_PMC1;
754 *val = get_reg_val(id, vcpu->arch.pmc[i]);
757 case KVM_REG_PPC_FPR0 ... KVM_REG_PPC_FPR31:
758 if (cpu_has_feature(CPU_FTR_VSX)) {
759 /* VSX => FP reg i is stored in arch.vsr[2*i] */
760 long int i = id - KVM_REG_PPC_FPR0;
761 *val = get_reg_val(id, vcpu->arch.vsr[2 * i]);
763 /* let generic code handle it */
767 case KVM_REG_PPC_VSR0 ... KVM_REG_PPC_VSR31:
768 if (cpu_has_feature(CPU_FTR_VSX)) {
769 long int i = id - KVM_REG_PPC_VSR0;
770 val->vsxval[0] = vcpu->arch.vsr[2 * i];
771 val->vsxval[1] = vcpu->arch.vsr[2 * i + 1];
776 #endif /* CONFIG_VSX */
777 case KVM_REG_PPC_VPA_ADDR:
778 spin_lock(&vcpu->arch.vpa_update_lock);
779 *val = get_reg_val(id, vcpu->arch.vpa.next_gpa);
780 spin_unlock(&vcpu->arch.vpa_update_lock);
782 case KVM_REG_PPC_VPA_SLB:
783 spin_lock(&vcpu->arch.vpa_update_lock);
784 val->vpaval.addr = vcpu->arch.slb_shadow.next_gpa;
785 val->vpaval.length = vcpu->arch.slb_shadow.len;
786 spin_unlock(&vcpu->arch.vpa_update_lock);
788 case KVM_REG_PPC_VPA_DTL:
789 spin_lock(&vcpu->arch.vpa_update_lock);
790 val->vpaval.addr = vcpu->arch.dtl.next_gpa;
791 val->vpaval.length = vcpu->arch.dtl.len;
792 spin_unlock(&vcpu->arch.vpa_update_lock);
802 int kvmppc_set_one_reg(struct kvm_vcpu *vcpu, u64 id, union kvmppc_one_reg *val)
806 unsigned long addr, len;
809 case KVM_REG_PPC_HIOR:
810 /* Only allow this to be set to zero */
811 if (set_reg_val(id, *val))
814 case KVM_REG_PPC_DABR:
815 vcpu->arch.dabr = set_reg_val(id, *val);
817 case KVM_REG_PPC_DSCR:
818 vcpu->arch.dscr = set_reg_val(id, *val);
820 case KVM_REG_PPC_PURR:
821 vcpu->arch.purr = set_reg_val(id, *val);
823 case KVM_REG_PPC_SPURR:
824 vcpu->arch.spurr = set_reg_val(id, *val);
826 case KVM_REG_PPC_AMR:
827 vcpu->arch.amr = set_reg_val(id, *val);
829 case KVM_REG_PPC_UAMOR:
830 vcpu->arch.uamor = set_reg_val(id, *val);
832 case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCRA:
833 i = id - KVM_REG_PPC_MMCR0;
834 vcpu->arch.mmcr[i] = set_reg_val(id, *val);
836 case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8:
837 i = id - KVM_REG_PPC_PMC1;
838 vcpu->arch.pmc[i] = set_reg_val(id, *val);
841 case KVM_REG_PPC_FPR0 ... KVM_REG_PPC_FPR31:
842 if (cpu_has_feature(CPU_FTR_VSX)) {
843 /* VSX => FP reg i is stored in arch.vsr[2*i] */
844 long int i = id - KVM_REG_PPC_FPR0;
845 vcpu->arch.vsr[2 * i] = set_reg_val(id, *val);
847 /* let generic code handle it */
851 case KVM_REG_PPC_VSR0 ... KVM_REG_PPC_VSR31:
852 if (cpu_has_feature(CPU_FTR_VSX)) {
853 long int i = id - KVM_REG_PPC_VSR0;
854 vcpu->arch.vsr[2 * i] = val->vsxval[0];
855 vcpu->arch.vsr[2 * i + 1] = val->vsxval[1];
860 #endif /* CONFIG_VSX */
861 case KVM_REG_PPC_VPA_ADDR:
862 addr = set_reg_val(id, *val);
864 if (!addr && (vcpu->arch.slb_shadow.next_gpa ||
865 vcpu->arch.dtl.next_gpa))
867 r = set_vpa(vcpu, &vcpu->arch.vpa, addr, sizeof(struct lppaca));
869 case KVM_REG_PPC_VPA_SLB:
870 addr = val->vpaval.addr;
871 len = val->vpaval.length;
873 if (addr && !vcpu->arch.vpa.next_gpa)
875 r = set_vpa(vcpu, &vcpu->arch.slb_shadow, addr, len);
877 case KVM_REG_PPC_VPA_DTL:
878 addr = val->vpaval.addr;
879 len = val->vpaval.length;
881 if (addr && (len < sizeof(struct dtl_entry) ||
882 !vcpu->arch.vpa.next_gpa))
884 len -= len % sizeof(struct dtl_entry);
885 r = set_vpa(vcpu, &vcpu->arch.dtl, addr, len);
895 int kvmppc_core_check_processor_compat(void)
897 if (cpu_has_feature(CPU_FTR_HVMODE))
902 struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
904 struct kvm_vcpu *vcpu;
907 struct kvmppc_vcore *vcore;
909 core = id / threads_per_core;
910 if (core >= KVM_MAX_VCORES)
914 vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
918 err = kvm_vcpu_init(vcpu, kvm, id);
922 vcpu->arch.shared = &vcpu->arch.shregs;
923 vcpu->arch.mmcr[0] = MMCR0_FC;
924 vcpu->arch.ctrl = CTRL_RUNLATCH;
925 /* default to host PVR, since we can't spoof it */
926 vcpu->arch.pvr = mfspr(SPRN_PVR);
927 kvmppc_set_pvr(vcpu, vcpu->arch.pvr);
928 spin_lock_init(&vcpu->arch.vpa_update_lock);
929 spin_lock_init(&vcpu->arch.tbacct_lock);
930 vcpu->arch.busy_preempt = TB_NIL;
932 kvmppc_mmu_book3s_hv_init(vcpu);
934 vcpu->arch.state = KVMPPC_VCPU_NOTREADY;
936 init_waitqueue_head(&vcpu->arch.cpu_run);
938 mutex_lock(&kvm->lock);
939 vcore = kvm->arch.vcores[core];
941 vcore = kzalloc(sizeof(struct kvmppc_vcore), GFP_KERNEL);
943 INIT_LIST_HEAD(&vcore->runnable_threads);
944 spin_lock_init(&vcore->lock);
945 init_waitqueue_head(&vcore->wq);
946 vcore->preempt_tb = TB_NIL;
948 kvm->arch.vcores[core] = vcore;
949 kvm->arch.online_vcores++;
951 mutex_unlock(&kvm->lock);
956 spin_lock(&vcore->lock);
957 ++vcore->num_threads;
958 spin_unlock(&vcore->lock);
959 vcpu->arch.vcore = vcore;
961 vcpu->arch.cpu_type = KVM_CPU_3S_64;
962 kvmppc_sanity_check(vcpu);
967 kmem_cache_free(kvm_vcpu_cache, vcpu);
972 static void unpin_vpa(struct kvm *kvm, struct kvmppc_vpa *vpa)
974 if (vpa->pinned_addr)
975 kvmppc_unpin_guest_page(kvm, vpa->pinned_addr, vpa->gpa,
979 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
981 spin_lock(&vcpu->arch.vpa_update_lock);
982 unpin_vpa(vcpu->kvm, &vcpu->arch.dtl);
983 unpin_vpa(vcpu->kvm, &vcpu->arch.slb_shadow);
984 unpin_vpa(vcpu->kvm, &vcpu->arch.vpa);
985 spin_unlock(&vcpu->arch.vpa_update_lock);
986 kvm_vcpu_uninit(vcpu);
987 kmem_cache_free(kvm_vcpu_cache, vcpu);
990 static void kvmppc_set_timer(struct kvm_vcpu *vcpu)
992 unsigned long dec_nsec, now;
995 if (now > vcpu->arch.dec_expires) {
996 /* decrementer has already gone negative */
997 kvmppc_core_queue_dec(vcpu);
998 kvmppc_core_prepare_to_enter(vcpu);
1001 dec_nsec = (vcpu->arch.dec_expires - now) * NSEC_PER_SEC
1003 hrtimer_start(&vcpu->arch.dec_timer, ktime_set(0, dec_nsec),
1005 vcpu->arch.timer_running = 1;
1008 static void kvmppc_end_cede(struct kvm_vcpu *vcpu)
1010 vcpu->arch.ceded = 0;
1011 if (vcpu->arch.timer_running) {
1012 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
1013 vcpu->arch.timer_running = 0;
1017 extern int __kvmppc_vcore_entry(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu);
1019 static void kvmppc_remove_runnable(struct kvmppc_vcore *vc,
1020 struct kvm_vcpu *vcpu)
1024 if (vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
1026 spin_lock(&vcpu->arch.tbacct_lock);
1028 vcpu->arch.busy_stolen += vcore_stolen_time(vc, now) -
1029 vcpu->arch.stolen_logged;
1030 vcpu->arch.busy_preempt = now;
1031 vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
1032 spin_unlock(&vcpu->arch.tbacct_lock);
1034 list_del(&vcpu->arch.run_list);
1037 static int kvmppc_grab_hwthread(int cpu)
1039 struct paca_struct *tpaca;
1040 long timeout = 1000;
1044 /* Ensure the thread won't go into the kernel if it wakes */
1045 tpaca->kvm_hstate.hwthread_req = 1;
1046 tpaca->kvm_hstate.kvm_vcpu = NULL;
1049 * If the thread is already executing in the kernel (e.g. handling
1050 * a stray interrupt), wait for it to get back to nap mode.
1051 * The smp_mb() is to ensure that our setting of hwthread_req
1052 * is visible before we look at hwthread_state, so if this
1053 * races with the code at system_reset_pSeries and the thread
1054 * misses our setting of hwthread_req, we are sure to see its
1055 * setting of hwthread_state, and vice versa.
1058 while (tpaca->kvm_hstate.hwthread_state == KVM_HWTHREAD_IN_KERNEL) {
1059 if (--timeout <= 0) {
1060 pr_err("KVM: couldn't grab cpu %d\n", cpu);
1068 static void kvmppc_release_hwthread(int cpu)
1070 struct paca_struct *tpaca;
1073 tpaca->kvm_hstate.hwthread_req = 0;
1074 tpaca->kvm_hstate.kvm_vcpu = NULL;
1077 static void kvmppc_start_thread(struct kvm_vcpu *vcpu)
1080 struct paca_struct *tpaca;
1081 struct kvmppc_vcore *vc = vcpu->arch.vcore;
1083 if (vcpu->arch.timer_running) {
1084 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
1085 vcpu->arch.timer_running = 0;
1087 cpu = vc->pcpu + vcpu->arch.ptid;
1089 tpaca->kvm_hstate.kvm_vcpu = vcpu;
1090 tpaca->kvm_hstate.kvm_vcore = vc;
1091 tpaca->kvm_hstate.napping = 0;
1092 vcpu->cpu = vc->pcpu;
1094 #if defined(CONFIG_PPC_ICP_NATIVE) && defined(CONFIG_SMP)
1095 if (vcpu->arch.ptid) {
1096 #ifdef CONFIG_KVM_XICS
1104 static void kvmppc_wait_for_nap(struct kvmppc_vcore *vc)
1110 while (vc->nap_count < vc->n_woken) {
1111 if (++i >= 1000000) {
1112 pr_err("kvmppc_wait_for_nap timeout %d %d\n",
1113 vc->nap_count, vc->n_woken);
1122 * Check that we are on thread 0 and that any other threads in
1123 * this core are off-line. Then grab the threads so they can't
1126 static int on_primary_thread(void)
1128 int cpu = smp_processor_id();
1129 int thr = cpu_thread_in_core(cpu);
1133 while (++thr < threads_per_core)
1134 if (cpu_online(cpu + thr))
1137 /* Grab all hw threads so they can't go into the kernel */
1138 for (thr = 1; thr < threads_per_core; ++thr) {
1139 if (kvmppc_grab_hwthread(cpu + thr)) {
1140 /* Couldn't grab one; let the others go */
1142 kvmppc_release_hwthread(cpu + thr);
1143 } while (--thr > 0);
1151 * Run a set of guest threads on a physical core.
1152 * Called with vc->lock held.
1154 static void kvmppc_run_core(struct kvmppc_vcore *vc)
1156 struct kvm_vcpu *vcpu, *vcpu0, *vnext;
1159 int ptid, i, need_vpa_update;
1161 struct kvm_vcpu *vcpus_to_update[threads_per_core];
1163 /* don't start if any threads have a signal pending */
1164 need_vpa_update = 0;
1165 list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) {
1166 if (signal_pending(vcpu->arch.run_task))
1168 if (vcpu->arch.vpa.update_pending ||
1169 vcpu->arch.slb_shadow.update_pending ||
1170 vcpu->arch.dtl.update_pending)
1171 vcpus_to_update[need_vpa_update++] = vcpu;
1175 * Initialize *vc, in particular vc->vcore_state, so we can
1176 * drop the vcore lock if necessary.
1180 vc->entry_exit_count = 0;
1181 vc->vcore_state = VCORE_STARTING;
1183 vc->napping_threads = 0;
1186 * Updating any of the vpas requires calling kvmppc_pin_guest_page,
1187 * which can't be called with any spinlocks held.
1189 if (need_vpa_update) {
1190 spin_unlock(&vc->lock);
1191 for (i = 0; i < need_vpa_update; ++i)
1192 kvmppc_update_vpas(vcpus_to_update[i]);
1193 spin_lock(&vc->lock);
1197 * Assign physical thread IDs, first to non-ceded vcpus
1198 * and then to ceded ones.
1202 list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) {
1203 if (!vcpu->arch.ceded) {
1206 vcpu->arch.ptid = ptid++;
1210 goto out; /* nothing to run; should never happen */
1211 list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
1212 if (vcpu->arch.ceded)
1213 vcpu->arch.ptid = ptid++;
1216 * Make sure we are running on thread 0, and that
1217 * secondary threads are offline.
1219 if (threads_per_core > 1 && !on_primary_thread()) {
1220 list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
1221 vcpu->arch.ret = -EBUSY;
1225 vc->pcpu = smp_processor_id();
1226 list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) {
1227 kvmppc_start_thread(vcpu);
1228 kvmppc_create_dtl_entry(vcpu, vc);
1231 vc->vcore_state = VCORE_RUNNING;
1233 spin_unlock(&vc->lock);
1237 srcu_idx = srcu_read_lock(&vcpu0->kvm->srcu);
1239 __kvmppc_vcore_entry(NULL, vcpu0);
1241 spin_lock(&vc->lock);
1242 /* disable sending of IPIs on virtual external irqs */
1243 list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
1245 /* wait for secondary threads to finish writing their state to memory */
1246 if (vc->nap_count < vc->n_woken)
1247 kvmppc_wait_for_nap(vc);
1248 for (i = 0; i < threads_per_core; ++i)
1249 kvmppc_release_hwthread(vc->pcpu + i);
1250 /* prevent other vcpu threads from doing kvmppc_start_thread() now */
1251 vc->vcore_state = VCORE_EXITING;
1252 spin_unlock(&vc->lock);
1254 srcu_read_unlock(&vcpu0->kvm->srcu, srcu_idx);
1256 /* make sure updates to secondary vcpu structs are visible now */
1263 spin_lock(&vc->lock);
1265 list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) {
1266 /* cancel pending dec exception if dec is positive */
1267 if (now < vcpu->arch.dec_expires &&
1268 kvmppc_core_pending_dec(vcpu))
1269 kvmppc_core_dequeue_dec(vcpu);
1272 if (vcpu->arch.trap)
1273 ret = kvmppc_handle_exit(vcpu->arch.kvm_run, vcpu,
1274 vcpu->arch.run_task);
1276 vcpu->arch.ret = ret;
1277 vcpu->arch.trap = 0;
1279 if (vcpu->arch.ceded) {
1280 if (ret != RESUME_GUEST)
1281 kvmppc_end_cede(vcpu);
1283 kvmppc_set_timer(vcpu);
1288 vc->vcore_state = VCORE_INACTIVE;
1289 list_for_each_entry_safe(vcpu, vnext, &vc->runnable_threads,
1291 if (vcpu->arch.ret != RESUME_GUEST) {
1292 kvmppc_remove_runnable(vc, vcpu);
1293 wake_up(&vcpu->arch.cpu_run);
1299 * Wait for some other vcpu thread to execute us, and
1300 * wake us up when we need to handle something in the host.
1302 static void kvmppc_wait_for_exec(struct kvm_vcpu *vcpu, int wait_state)
1306 prepare_to_wait(&vcpu->arch.cpu_run, &wait, wait_state);
1307 if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE)
1309 finish_wait(&vcpu->arch.cpu_run, &wait);
1313 * All the vcpus in this vcore are idle, so wait for a decrementer
1314 * or external interrupt to one of the vcpus. vc->lock is held.
1316 static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
1320 prepare_to_wait(&vc->wq, &wait, TASK_INTERRUPTIBLE);
1321 vc->vcore_state = VCORE_SLEEPING;
1322 spin_unlock(&vc->lock);
1324 finish_wait(&vc->wq, &wait);
1325 spin_lock(&vc->lock);
1326 vc->vcore_state = VCORE_INACTIVE;
1329 static int kvmppc_run_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
1332 struct kvmppc_vcore *vc;
1333 struct kvm_vcpu *v, *vn;
1335 kvm_run->exit_reason = 0;
1336 vcpu->arch.ret = RESUME_GUEST;
1337 vcpu->arch.trap = 0;
1338 kvmppc_update_vpas(vcpu);
1341 * Synchronize with other threads in this virtual core
1343 vc = vcpu->arch.vcore;
1344 spin_lock(&vc->lock);
1345 vcpu->arch.ceded = 0;
1346 vcpu->arch.run_task = current;
1347 vcpu->arch.kvm_run = kvm_run;
1348 vcpu->arch.stolen_logged = vcore_stolen_time(vc, mftb());
1349 vcpu->arch.state = KVMPPC_VCPU_RUNNABLE;
1350 vcpu->arch.busy_preempt = TB_NIL;
1351 list_add_tail(&vcpu->arch.run_list, &vc->runnable_threads);
1355 * This happens the first time this is called for a vcpu.
1356 * If the vcore is already running, we may be able to start
1357 * this thread straight away and have it join in.
1359 if (!signal_pending(current)) {
1360 if (vc->vcore_state == VCORE_RUNNING &&
1361 VCORE_EXIT_COUNT(vc) == 0) {
1362 vcpu->arch.ptid = vc->n_runnable - 1;
1363 kvmppc_create_dtl_entry(vcpu, vc);
1364 kvmppc_start_thread(vcpu);
1365 } else if (vc->vcore_state == VCORE_SLEEPING) {
1371 while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
1372 !signal_pending(current)) {
1373 if (vc->vcore_state != VCORE_INACTIVE) {
1374 spin_unlock(&vc->lock);
1375 kvmppc_wait_for_exec(vcpu, TASK_INTERRUPTIBLE);
1376 spin_lock(&vc->lock);
1379 list_for_each_entry_safe(v, vn, &vc->runnable_threads,
1381 kvmppc_core_prepare_to_enter(v);
1382 if (signal_pending(v->arch.run_task)) {
1383 kvmppc_remove_runnable(vc, v);
1384 v->stat.signal_exits++;
1385 v->arch.kvm_run->exit_reason = KVM_EXIT_INTR;
1386 v->arch.ret = -EINTR;
1387 wake_up(&v->arch.cpu_run);
1390 if (!vc->n_runnable || vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
1394 list_for_each_entry(v, &vc->runnable_threads, arch.run_list) {
1395 if (!v->arch.pending_exceptions)
1396 n_ceded += v->arch.ceded;
1400 if (n_ceded == vc->n_runnable)
1401 kvmppc_vcore_blocked(vc);
1403 kvmppc_run_core(vc);
1407 while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
1408 (vc->vcore_state == VCORE_RUNNING ||
1409 vc->vcore_state == VCORE_EXITING)) {
1410 spin_unlock(&vc->lock);
1411 kvmppc_wait_for_exec(vcpu, TASK_UNINTERRUPTIBLE);
1412 spin_lock(&vc->lock);
1415 if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) {
1416 kvmppc_remove_runnable(vc, vcpu);
1417 vcpu->stat.signal_exits++;
1418 kvm_run->exit_reason = KVM_EXIT_INTR;
1419 vcpu->arch.ret = -EINTR;
1422 if (vc->n_runnable && vc->vcore_state == VCORE_INACTIVE) {
1423 /* Wake up some vcpu to run the core */
1424 v = list_first_entry(&vc->runnable_threads,
1425 struct kvm_vcpu, arch.run_list);
1426 wake_up(&v->arch.cpu_run);
1429 spin_unlock(&vc->lock);
1430 return vcpu->arch.ret;
1433 int kvmppc_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu)
1438 if (!vcpu->arch.sane) {
1439 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1443 kvmppc_core_prepare_to_enter(vcpu);
1445 /* No need to go into the guest when all we'll do is come back out */
1446 if (signal_pending(current)) {
1447 run->exit_reason = KVM_EXIT_INTR;
1451 atomic_inc(&vcpu->kvm->arch.vcpus_running);
1452 /* Order vcpus_running vs. rma_setup_done, see kvmppc_alloc_reset_hpt */
1455 /* On the first time here, set up HTAB and VRMA or RMA */
1456 if (!vcpu->kvm->arch.rma_setup_done) {
1457 r = kvmppc_hv_setup_htab_rma(vcpu);
1462 flush_fp_to_thread(current);
1463 flush_altivec_to_thread(current);
1464 flush_vsx_to_thread(current);
1465 vcpu->arch.wqp = &vcpu->arch.vcore->wq;
1466 vcpu->arch.pgdir = current->mm->pgd;
1467 vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
1470 r = kvmppc_run_vcpu(run, vcpu);
1472 if (run->exit_reason == KVM_EXIT_PAPR_HCALL &&
1473 !(vcpu->arch.shregs.msr & MSR_PR)) {
1474 r = kvmppc_pseries_do_hcall(vcpu);
1475 kvmppc_core_prepare_to_enter(vcpu);
1476 } else if (r == RESUME_PAGE_FAULT) {
1477 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1478 r = kvmppc_book3s_hv_page_fault(run, vcpu,
1479 vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
1480 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
1482 } while (r == RESUME_GUEST);
1485 vcpu->arch.state = KVMPPC_VCPU_NOTREADY;
1486 atomic_dec(&vcpu->kvm->arch.vcpus_running);
1491 /* Work out RMLS (real mode limit selector) field value for a given RMA size.
1492 Assumes POWER7 or PPC970. */
1493 static inline int lpcr_rmls(unsigned long rma_size)
1496 case 32ul << 20: /* 32 MB */
1497 if (cpu_has_feature(CPU_FTR_ARCH_206))
1498 return 8; /* only supported on POWER7 */
1500 case 64ul << 20: /* 64 MB */
1502 case 128ul << 20: /* 128 MB */
1504 case 256ul << 20: /* 256 MB */
1506 case 1ul << 30: /* 1 GB */
1508 case 16ul << 30: /* 16 GB */
1510 case 256ul << 30: /* 256 GB */
1517 static int kvm_rma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1519 struct kvmppc_linear_info *ri = vma->vm_file->private_data;
1522 if (vmf->pgoff >= ri->npages)
1523 return VM_FAULT_SIGBUS;
1525 page = pfn_to_page(ri->base_pfn + vmf->pgoff);
1531 static const struct vm_operations_struct kvm_rma_vm_ops = {
1532 .fault = kvm_rma_fault,
1535 static int kvm_rma_mmap(struct file *file, struct vm_area_struct *vma)
1537 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
1538 vma->vm_ops = &kvm_rma_vm_ops;
1542 static int kvm_rma_release(struct inode *inode, struct file *filp)
1544 struct kvmppc_linear_info *ri = filp->private_data;
1546 kvm_release_rma(ri);
1550 static const struct file_operations kvm_rma_fops = {
1551 .mmap = kvm_rma_mmap,
1552 .release = kvm_rma_release,
1555 long kvm_vm_ioctl_allocate_rma(struct kvm *kvm, struct kvm_allocate_rma *ret)
1557 struct kvmppc_linear_info *ri;
1560 ri = kvm_alloc_rma();
1564 fd = anon_inode_getfd("kvm-rma", &kvm_rma_fops, ri, O_RDWR);
1566 kvm_release_rma(ri);
1568 ret->rma_size = ri->npages << PAGE_SHIFT;
1572 static void kvmppc_add_seg_page_size(struct kvm_ppc_one_seg_page_size **sps,
1575 struct mmu_psize_def *def = &mmu_psize_defs[linux_psize];
1579 (*sps)->page_shift = def->shift;
1580 (*sps)->slb_enc = def->sllp;
1581 (*sps)->enc[0].page_shift = def->shift;
1583 * Only return base page encoding. We don't want to return
1584 * all the supporting pte_enc, because our H_ENTER doesn't
1585 * support MPSS yet. Once they do, we can start passing all
1586 * support pte_enc here
1588 (*sps)->enc[0].pte_enc = def->penc[linux_psize];
1592 int kvm_vm_ioctl_get_smmu_info(struct kvm *kvm, struct kvm_ppc_smmu_info *info)
1594 struct kvm_ppc_one_seg_page_size *sps;
1596 info->flags = KVM_PPC_PAGE_SIZES_REAL;
1597 if (mmu_has_feature(MMU_FTR_1T_SEGMENT))
1598 info->flags |= KVM_PPC_1T_SEGMENTS;
1599 info->slb_size = mmu_slb_size;
1601 /* We only support these sizes for now, and no muti-size segments */
1602 sps = &info->sps[0];
1603 kvmppc_add_seg_page_size(&sps, MMU_PAGE_4K);
1604 kvmppc_add_seg_page_size(&sps, MMU_PAGE_64K);
1605 kvmppc_add_seg_page_size(&sps, MMU_PAGE_16M);
1611 * Get (and clear) the dirty memory log for a memory slot.
1613 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
1615 struct kvm_memory_slot *memslot;
1619 mutex_lock(&kvm->slots_lock);
1622 if (log->slot >= KVM_USER_MEM_SLOTS)
1625 memslot = id_to_memslot(kvm->memslots, log->slot);
1627 if (!memslot->dirty_bitmap)
1630 n = kvm_dirty_bitmap_bytes(memslot);
1631 memset(memslot->dirty_bitmap, 0, n);
1633 r = kvmppc_hv_get_dirty_log(kvm, memslot, memslot->dirty_bitmap);
1638 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
1643 mutex_unlock(&kvm->slots_lock);
1647 static void unpin_slot(struct kvm_memory_slot *memslot)
1649 unsigned long *physp;
1650 unsigned long j, npages, pfn;
1653 physp = memslot->arch.slot_phys;
1654 npages = memslot->npages;
1657 for (j = 0; j < npages; j++) {
1658 if (!(physp[j] & KVMPPC_GOT_PAGE))
1660 pfn = physp[j] >> PAGE_SHIFT;
1661 page = pfn_to_page(pfn);
1667 void kvmppc_core_free_memslot(struct kvm_memory_slot *free,
1668 struct kvm_memory_slot *dont)
1670 if (!dont || free->arch.rmap != dont->arch.rmap) {
1671 vfree(free->arch.rmap);
1672 free->arch.rmap = NULL;
1674 if (!dont || free->arch.slot_phys != dont->arch.slot_phys) {
1676 vfree(free->arch.slot_phys);
1677 free->arch.slot_phys = NULL;
1681 int kvmppc_core_create_memslot(struct kvm_memory_slot *slot,
1682 unsigned long npages)
1684 slot->arch.rmap = vzalloc(npages * sizeof(*slot->arch.rmap));
1685 if (!slot->arch.rmap)
1687 slot->arch.slot_phys = NULL;
1692 int kvmppc_core_prepare_memory_region(struct kvm *kvm,
1693 struct kvm_memory_slot *memslot,
1694 struct kvm_userspace_memory_region *mem)
1696 unsigned long *phys;
1698 /* Allocate a slot_phys array if needed */
1699 phys = memslot->arch.slot_phys;
1700 if (!kvm->arch.using_mmu_notifiers && !phys && memslot->npages) {
1701 phys = vzalloc(memslot->npages * sizeof(unsigned long));
1704 memslot->arch.slot_phys = phys;
1710 void kvmppc_core_commit_memory_region(struct kvm *kvm,
1711 struct kvm_userspace_memory_region *mem,
1712 const struct kvm_memory_slot *old)
1714 unsigned long npages = mem->memory_size >> PAGE_SHIFT;
1715 struct kvm_memory_slot *memslot;
1717 if (npages && old->npages) {
1719 * If modifying a memslot, reset all the rmap dirty bits.
1720 * If this is a new memslot, we don't need to do anything
1721 * since the rmap array starts out as all zeroes,
1722 * i.e. no pages are dirty.
1724 memslot = id_to_memslot(kvm->memslots, mem->slot);
1725 kvmppc_hv_get_dirty_log(kvm, memslot, NULL);
1729 static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu)
1732 struct kvm *kvm = vcpu->kvm;
1733 struct kvmppc_linear_info *ri = NULL;
1735 struct kvm_memory_slot *memslot;
1736 struct vm_area_struct *vma;
1737 unsigned long lpcr, senc;
1738 unsigned long psize, porder;
1739 unsigned long rma_size;
1741 unsigned long *physp;
1742 unsigned long i, npages;
1745 mutex_lock(&kvm->lock);
1746 if (kvm->arch.rma_setup_done)
1747 goto out; /* another vcpu beat us to it */
1749 /* Allocate hashed page table (if not done already) and reset it */
1750 if (!kvm->arch.hpt_virt) {
1751 err = kvmppc_alloc_hpt(kvm, NULL);
1753 pr_err("KVM: Couldn't alloc HPT\n");
1758 /* Look up the memslot for guest physical address 0 */
1759 srcu_idx = srcu_read_lock(&kvm->srcu);
1760 memslot = gfn_to_memslot(kvm, 0);
1762 /* We must have some memory at 0 by now */
1764 if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID))
1767 /* Look up the VMA for the start of this memory slot */
1768 hva = memslot->userspace_addr;
1769 down_read(¤t->mm->mmap_sem);
1770 vma = find_vma(current->mm, hva);
1771 if (!vma || vma->vm_start > hva || (vma->vm_flags & VM_IO))
1774 psize = vma_kernel_pagesize(vma);
1775 porder = __ilog2(psize);
1777 /* Is this one of our preallocated RMAs? */
1778 if (vma->vm_file && vma->vm_file->f_op == &kvm_rma_fops &&
1779 hva == vma->vm_start)
1780 ri = vma->vm_file->private_data;
1782 up_read(¤t->mm->mmap_sem);
1785 /* On POWER7, use VRMA; on PPC970, give up */
1787 if (cpu_has_feature(CPU_FTR_ARCH_201)) {
1788 pr_err("KVM: CPU requires an RMO\n");
1792 /* We can handle 4k, 64k or 16M pages in the VRMA */
1794 if (!(psize == 0x1000 || psize == 0x10000 ||
1795 psize == 0x1000000))
1798 /* Update VRMASD field in the LPCR */
1799 senc = slb_pgsize_encoding(psize);
1800 kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T |
1801 (VRMA_VSID << SLB_VSID_SHIFT_1T);
1802 lpcr = kvm->arch.lpcr & ~LPCR_VRMASD;
1803 lpcr |= senc << (LPCR_VRMASD_SH - 4);
1804 kvm->arch.lpcr = lpcr;
1806 /* Create HPTEs in the hash page table for the VRMA */
1807 kvmppc_map_vrma(vcpu, memslot, porder);
1810 /* Set up to use an RMO region */
1811 rma_size = ri->npages;
1812 if (rma_size > memslot->npages)
1813 rma_size = memslot->npages;
1814 rma_size <<= PAGE_SHIFT;
1815 rmls = lpcr_rmls(rma_size);
1818 pr_err("KVM: Can't use RMA of 0x%lx bytes\n", rma_size);
1821 atomic_inc(&ri->use_count);
1824 /* Update LPCR and RMOR */
1825 lpcr = kvm->arch.lpcr;
1826 if (cpu_has_feature(CPU_FTR_ARCH_201)) {
1827 /* PPC970; insert RMLS value (split field) in HID4 */
1828 lpcr &= ~((1ul << HID4_RMLS0_SH) |
1829 (3ul << HID4_RMLS2_SH));
1830 lpcr |= ((rmls >> 2) << HID4_RMLS0_SH) |
1831 ((rmls & 3) << HID4_RMLS2_SH);
1832 /* RMOR is also in HID4 */
1833 lpcr |= ((ri->base_pfn >> (26 - PAGE_SHIFT)) & 0xffff)
1837 lpcr &= ~(LPCR_VPM0 | LPCR_VRMA_L);
1838 lpcr |= rmls << LPCR_RMLS_SH;
1839 kvm->arch.rmor = kvm->arch.rma->base_pfn << PAGE_SHIFT;
1841 kvm->arch.lpcr = lpcr;
1842 pr_info("KVM: Using RMO at %lx size %lx (LPCR = %lx)\n",
1843 ri->base_pfn << PAGE_SHIFT, rma_size, lpcr);
1845 /* Initialize phys addrs of pages in RMO */
1846 npages = ri->npages;
1847 porder = __ilog2(npages);
1848 physp = memslot->arch.slot_phys;
1850 if (npages > memslot->npages)
1851 npages = memslot->npages;
1852 spin_lock(&kvm->arch.slot_phys_lock);
1853 for (i = 0; i < npages; ++i)
1854 physp[i] = ((ri->base_pfn + i) << PAGE_SHIFT) +
1856 spin_unlock(&kvm->arch.slot_phys_lock);
1860 /* Order updates to kvm->arch.lpcr etc. vs. rma_setup_done */
1862 kvm->arch.rma_setup_done = 1;
1865 srcu_read_unlock(&kvm->srcu, srcu_idx);
1867 mutex_unlock(&kvm->lock);
1871 up_read(¤t->mm->mmap_sem);
1875 int kvmppc_core_init_vm(struct kvm *kvm)
1877 unsigned long lpcr, lpid;
1879 /* Allocate the guest's logical partition ID */
1881 lpid = kvmppc_alloc_lpid();
1884 kvm->arch.lpid = lpid;
1887 * Since we don't flush the TLB when tearing down a VM,
1888 * and this lpid might have previously been used,
1889 * make sure we flush on each core before running the new VM.
1891 cpumask_setall(&kvm->arch.need_tlb_flush);
1893 INIT_LIST_HEAD(&kvm->arch.spapr_tce_tables);
1894 INIT_LIST_HEAD(&kvm->arch.rtas_tokens);
1896 kvm->arch.rma = NULL;
1898 kvm->arch.host_sdr1 = mfspr(SPRN_SDR1);
1900 if (cpu_has_feature(CPU_FTR_ARCH_201)) {
1901 /* PPC970; HID4 is effectively the LPCR */
1902 kvm->arch.host_lpid = 0;
1903 kvm->arch.host_lpcr = lpcr = mfspr(SPRN_HID4);
1904 lpcr &= ~((3 << HID4_LPID1_SH) | (0xful << HID4_LPID5_SH));
1905 lpcr |= ((lpid >> 4) << HID4_LPID1_SH) |
1906 ((lpid & 0xf) << HID4_LPID5_SH);
1908 /* POWER7; init LPCR for virtual RMA mode */
1909 kvm->arch.host_lpid = mfspr(SPRN_LPID);
1910 kvm->arch.host_lpcr = lpcr = mfspr(SPRN_LPCR);
1911 lpcr &= LPCR_PECE | LPCR_LPES;
1912 lpcr |= (4UL << LPCR_DPFD_SH) | LPCR_HDICE |
1913 LPCR_VPM0 | LPCR_VPM1;
1914 kvm->arch.vrma_slb_v = SLB_VSID_B_1T |
1915 (VRMA_VSID << SLB_VSID_SHIFT_1T);
1917 kvm->arch.lpcr = lpcr;
1919 kvm->arch.using_mmu_notifiers = !!cpu_has_feature(CPU_FTR_ARCH_206);
1920 spin_lock_init(&kvm->arch.slot_phys_lock);
1923 * Don't allow secondary CPU threads to come online
1924 * while any KVM VMs exist.
1926 inhibit_secondary_onlining();
1931 void kvmppc_core_destroy_vm(struct kvm *kvm)
1933 uninhibit_secondary_onlining();
1935 if (kvm->arch.rma) {
1936 kvm_release_rma(kvm->arch.rma);
1937 kvm->arch.rma = NULL;
1940 kvmppc_rtas_tokens_free(kvm);
1942 kvmppc_free_hpt(kvm);
1943 WARN_ON(!list_empty(&kvm->arch.spapr_tce_tables));
1946 /* These are stubs for now */
1947 void kvmppc_mmu_pte_pflush(struct kvm_vcpu *vcpu, ulong pa_start, ulong pa_end)
1951 /* We don't need to emulate any privileged instructions or dcbz */
1952 int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
1953 unsigned int inst, int *advance)
1955 return EMULATE_FAIL;
1958 int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, ulong spr_val)
1960 return EMULATE_FAIL;
1963 int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, ulong *spr_val)
1965 return EMULATE_FAIL;
1968 static int kvmppc_book3s_hv_init(void)
1972 r = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1977 r = kvmppc_mmu_hv_init();
1982 static void kvmppc_book3s_hv_exit(void)
1987 module_init(kvmppc_book3s_hv_init);
1988 module_exit(kvmppc_book3s_hv_exit);