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 int real_cpu
= cpu
+ vcpu
->arch
.ptid
;
86 if (paca
[real_cpu
].kvm_hstate
.xics_phys
)
87 xics_wake_cpu(real_cpu
);
88 else if (cpu_online(cpu
))
89 smp_send_reschedule(cpu
);
95 * We use the vcpu_load/put functions to measure stolen time.
96 * Stolen time is counted as time when either the vcpu is able to
97 * run as part of a virtual core, but the task running the vcore
98 * is preempted or sleeping, or when the vcpu needs something done
99 * in the kernel by the task running the vcpu, but that task is
100 * preempted or sleeping. Those two things have to be counted
101 * separately, since one of the vcpu tasks will take on the job
102 * of running the core, and the other vcpu tasks in the vcore will
103 * sleep waiting for it to do that, but that sleep shouldn't count
106 * Hence we accumulate stolen time when the vcpu can run as part of
107 * a vcore using vc->stolen_tb, and the stolen time when the vcpu
108 * needs its task to do other things in the kernel (for example,
109 * service a page fault) in busy_stolen. We don't accumulate
110 * stolen time for a vcore when it is inactive, or for a vcpu
111 * when it is in state RUNNING or NOTREADY. NOTREADY is a bit of
112 * a misnomer; it means that the vcpu task is not executing in
113 * the KVM_VCPU_RUN ioctl, i.e. it is in userspace or elsewhere in
114 * the kernel. We don't have any way of dividing up that time
115 * between time that the vcpu is genuinely stopped, time that
116 * the task is actively working on behalf of the vcpu, and time
117 * that the task is preempted, so we don't count any of it as
120 * Updates to busy_stolen are protected by arch.tbacct_lock;
121 * updates to vc->stolen_tb are protected by the arch.tbacct_lock
122 * of the vcpu that has taken responsibility for running the vcore
123 * (i.e. vc->runner). The stolen times are measured in units of
124 * timebase ticks. (Note that the != TB_NIL checks below are
125 * purely defensive; they should never fail.)
128 void kvmppc_core_vcpu_load(struct kvm_vcpu
*vcpu
, int cpu
)
130 struct kvmppc_vcore
*vc
= vcpu
->arch
.vcore
;
132 spin_lock(&vcpu
->arch
.tbacct_lock
);
133 if (vc
->runner
== vcpu
&& vc
->vcore_state
!= VCORE_INACTIVE
&&
134 vc
->preempt_tb
!= TB_NIL
) {
135 vc
->stolen_tb
+= mftb() - vc
->preempt_tb
;
136 vc
->preempt_tb
= TB_NIL
;
138 if (vcpu
->arch
.state
== KVMPPC_VCPU_BUSY_IN_HOST
&&
139 vcpu
->arch
.busy_preempt
!= TB_NIL
) {
140 vcpu
->arch
.busy_stolen
+= mftb() - vcpu
->arch
.busy_preempt
;
141 vcpu
->arch
.busy_preempt
= TB_NIL
;
143 spin_unlock(&vcpu
->arch
.tbacct_lock
);
146 void kvmppc_core_vcpu_put(struct kvm_vcpu
*vcpu
)
148 struct kvmppc_vcore
*vc
= vcpu
->arch
.vcore
;
150 spin_lock(&vcpu
->arch
.tbacct_lock
);
151 if (vc
->runner
== vcpu
&& vc
->vcore_state
!= VCORE_INACTIVE
)
152 vc
->preempt_tb
= mftb();
153 if (vcpu
->arch
.state
== KVMPPC_VCPU_BUSY_IN_HOST
)
154 vcpu
->arch
.busy_preempt
= mftb();
155 spin_unlock(&vcpu
->arch
.tbacct_lock
);
158 void kvmppc_set_msr(struct kvm_vcpu
*vcpu
, u64 msr
)
160 vcpu
->arch
.shregs
.msr
= msr
;
161 kvmppc_end_cede(vcpu
);
164 void kvmppc_set_pvr(struct kvm_vcpu
*vcpu
, u32 pvr
)
166 vcpu
->arch
.pvr
= pvr
;
169 void kvmppc_dump_regs(struct kvm_vcpu
*vcpu
)
173 pr_err("vcpu %p (%d):\n", vcpu
, vcpu
->vcpu_id
);
174 pr_err("pc = %.16lx msr = %.16llx trap = %x\n",
175 vcpu
->arch
.pc
, vcpu
->arch
.shregs
.msr
, vcpu
->arch
.trap
);
176 for (r
= 0; r
< 16; ++r
)
177 pr_err("r%2d = %.16lx r%d = %.16lx\n",
178 r
, kvmppc_get_gpr(vcpu
, r
),
179 r
+16, kvmppc_get_gpr(vcpu
, r
+16));
180 pr_err("ctr = %.16lx lr = %.16lx\n",
181 vcpu
->arch
.ctr
, vcpu
->arch
.lr
);
182 pr_err("srr0 = %.16llx srr1 = %.16llx\n",
183 vcpu
->arch
.shregs
.srr0
, vcpu
->arch
.shregs
.srr1
);
184 pr_err("sprg0 = %.16llx sprg1 = %.16llx\n",
185 vcpu
->arch
.shregs
.sprg0
, vcpu
->arch
.shregs
.sprg1
);
186 pr_err("sprg2 = %.16llx sprg3 = %.16llx\n",
187 vcpu
->arch
.shregs
.sprg2
, vcpu
->arch
.shregs
.sprg3
);
188 pr_err("cr = %.8x xer = %.16lx dsisr = %.8x\n",
189 vcpu
->arch
.cr
, vcpu
->arch
.xer
, vcpu
->arch
.shregs
.dsisr
);
190 pr_err("dar = %.16llx\n", vcpu
->arch
.shregs
.dar
);
191 pr_err("fault dar = %.16lx dsisr = %.8x\n",
192 vcpu
->arch
.fault_dar
, vcpu
->arch
.fault_dsisr
);
193 pr_err("SLB (%d entries):\n", vcpu
->arch
.slb_max
);
194 for (r
= 0; r
< vcpu
->arch
.slb_max
; ++r
)
195 pr_err(" ESID = %.16llx VSID = %.16llx\n",
196 vcpu
->arch
.slb
[r
].orige
, vcpu
->arch
.slb
[r
].origv
);
197 pr_err("lpcr = %.16lx sdr1 = %.16lx last_inst = %.8x\n",
198 vcpu
->kvm
->arch
.lpcr
, vcpu
->kvm
->arch
.sdr1
,
199 vcpu
->arch
.last_inst
);
202 struct kvm_vcpu
*kvmppc_find_vcpu(struct kvm
*kvm
, int id
)
205 struct kvm_vcpu
*v
, *ret
= NULL
;
207 mutex_lock(&kvm
->lock
);
208 kvm_for_each_vcpu(r
, v
, kvm
) {
209 if (v
->vcpu_id
== id
) {
214 mutex_unlock(&kvm
->lock
);
218 static void init_vpa(struct kvm_vcpu
*vcpu
, struct lppaca
*vpa
)
220 vpa
->shared_proc
= 1;
221 vpa
->yield_count
= 1;
224 static int set_vpa(struct kvm_vcpu
*vcpu
, struct kvmppc_vpa
*v
,
225 unsigned long addr
, unsigned long len
)
227 /* check address is cacheline aligned */
228 if (addr
& (L1_CACHE_BYTES
- 1))
230 spin_lock(&vcpu
->arch
.vpa_update_lock
);
231 if (v
->next_gpa
!= addr
|| v
->len
!= len
) {
233 v
->len
= addr
? len
: 0;
234 v
->update_pending
= 1;
236 spin_unlock(&vcpu
->arch
.vpa_update_lock
);
240 /* Length for a per-processor buffer is passed in at offset 4 in the buffer */
249 static int vpa_is_registered(struct kvmppc_vpa
*vpap
)
251 if (vpap
->update_pending
)
252 return vpap
->next_gpa
!= 0;
253 return vpap
->pinned_addr
!= NULL
;
256 static unsigned long do_h_register_vpa(struct kvm_vcpu
*vcpu
,
258 unsigned long vcpuid
, unsigned long vpa
)
260 struct kvm
*kvm
= vcpu
->kvm
;
261 unsigned long len
, nb
;
263 struct kvm_vcpu
*tvcpu
;
266 struct kvmppc_vpa
*vpap
;
268 tvcpu
= kvmppc_find_vcpu(kvm
, vcpuid
);
272 subfunc
= (flags
>> H_VPA_FUNC_SHIFT
) & H_VPA_FUNC_MASK
;
273 if (subfunc
== H_VPA_REG_VPA
|| subfunc
== H_VPA_REG_DTL
||
274 subfunc
== H_VPA_REG_SLB
) {
275 /* Registering new area - address must be cache-line aligned */
276 if ((vpa
& (L1_CACHE_BYTES
- 1)) || !vpa
)
279 /* convert logical addr to kernel addr and read length */
280 va
= kvmppc_pin_guest_page(kvm
, vpa
, &nb
);
283 if (subfunc
== H_VPA_REG_VPA
)
284 len
= ((struct reg_vpa
*)va
)->length
.hword
;
286 len
= ((struct reg_vpa
*)va
)->length
.word
;
287 kvmppc_unpin_guest_page(kvm
, va
, vpa
, false);
290 if (len
> nb
|| len
< sizeof(struct reg_vpa
))
299 spin_lock(&tvcpu
->arch
.vpa_update_lock
);
302 case H_VPA_REG_VPA
: /* register VPA */
303 if (len
< sizeof(struct lppaca
))
305 vpap
= &tvcpu
->arch
.vpa
;
309 case H_VPA_REG_DTL
: /* register DTL */
310 if (len
< sizeof(struct dtl_entry
))
312 len
-= len
% sizeof(struct dtl_entry
);
314 /* Check that they have previously registered a VPA */
316 if (!vpa_is_registered(&tvcpu
->arch
.vpa
))
319 vpap
= &tvcpu
->arch
.dtl
;
323 case H_VPA_REG_SLB
: /* register SLB shadow buffer */
324 /* Check that they have previously registered a VPA */
326 if (!vpa_is_registered(&tvcpu
->arch
.vpa
))
329 vpap
= &tvcpu
->arch
.slb_shadow
;
333 case H_VPA_DEREG_VPA
: /* deregister VPA */
334 /* Check they don't still have a DTL or SLB buf registered */
336 if (vpa_is_registered(&tvcpu
->arch
.dtl
) ||
337 vpa_is_registered(&tvcpu
->arch
.slb_shadow
))
340 vpap
= &tvcpu
->arch
.vpa
;
344 case H_VPA_DEREG_DTL
: /* deregister DTL */
345 vpap
= &tvcpu
->arch
.dtl
;
349 case H_VPA_DEREG_SLB
: /* deregister SLB shadow buffer */
350 vpap
= &tvcpu
->arch
.slb_shadow
;
356 vpap
->next_gpa
= vpa
;
358 vpap
->update_pending
= 1;
361 spin_unlock(&tvcpu
->arch
.vpa_update_lock
);
366 static void kvmppc_update_vpa(struct kvm_vcpu
*vcpu
, struct kvmppc_vpa
*vpap
)
368 struct kvm
*kvm
= vcpu
->kvm
;
374 * We need to pin the page pointed to by vpap->next_gpa,
375 * but we can't call kvmppc_pin_guest_page under the lock
376 * as it does get_user_pages() and down_read(). So we
377 * have to drop the lock, pin the page, then get the lock
378 * again and check that a new area didn't get registered
382 gpa
= vpap
->next_gpa
;
383 spin_unlock(&vcpu
->arch
.vpa_update_lock
);
387 va
= kvmppc_pin_guest_page(kvm
, gpa
, &nb
);
388 spin_lock(&vcpu
->arch
.vpa_update_lock
);
389 if (gpa
== vpap
->next_gpa
)
391 /* sigh... unpin that one and try again */
393 kvmppc_unpin_guest_page(kvm
, va
, gpa
, false);
396 vpap
->update_pending
= 0;
397 if (va
&& nb
< vpap
->len
) {
399 * If it's now too short, it must be that userspace
400 * has changed the mappings underlying guest memory,
401 * so unregister the region.
403 kvmppc_unpin_guest_page(kvm
, va
, gpa
, false);
406 if (vpap
->pinned_addr
)
407 kvmppc_unpin_guest_page(kvm
, vpap
->pinned_addr
, vpap
->gpa
,
410 vpap
->pinned_addr
= va
;
413 vpap
->pinned_end
= va
+ vpap
->len
;
416 static void kvmppc_update_vpas(struct kvm_vcpu
*vcpu
)
418 if (!(vcpu
->arch
.vpa
.update_pending
||
419 vcpu
->arch
.slb_shadow
.update_pending
||
420 vcpu
->arch
.dtl
.update_pending
))
423 spin_lock(&vcpu
->arch
.vpa_update_lock
);
424 if (vcpu
->arch
.vpa
.update_pending
) {
425 kvmppc_update_vpa(vcpu
, &vcpu
->arch
.vpa
);
426 if (vcpu
->arch
.vpa
.pinned_addr
)
427 init_vpa(vcpu
, vcpu
->arch
.vpa
.pinned_addr
);
429 if (vcpu
->arch
.dtl
.update_pending
) {
430 kvmppc_update_vpa(vcpu
, &vcpu
->arch
.dtl
);
431 vcpu
->arch
.dtl_ptr
= vcpu
->arch
.dtl
.pinned_addr
;
432 vcpu
->arch
.dtl_index
= 0;
434 if (vcpu
->arch
.slb_shadow
.update_pending
)
435 kvmppc_update_vpa(vcpu
, &vcpu
->arch
.slb_shadow
);
436 spin_unlock(&vcpu
->arch
.vpa_update_lock
);
440 * Return the accumulated stolen time for the vcore up until `now'.
441 * The caller should hold the vcore lock.
443 static u64
vcore_stolen_time(struct kvmppc_vcore
*vc
, u64 now
)
448 * If we are the task running the vcore, then since we hold
449 * the vcore lock, we can't be preempted, so stolen_tb/preempt_tb
450 * can't be updated, so we don't need the tbacct_lock.
451 * If the vcore is inactive, it can't become active (since we
452 * hold the vcore lock), so the vcpu load/put functions won't
453 * update stolen_tb/preempt_tb, and we don't need tbacct_lock.
455 if (vc
->vcore_state
!= VCORE_INACTIVE
&&
456 vc
->runner
->arch
.run_task
!= current
) {
457 spin_lock(&vc
->runner
->arch
.tbacct_lock
);
459 if (vc
->preempt_tb
!= TB_NIL
)
460 p
+= now
- vc
->preempt_tb
;
461 spin_unlock(&vc
->runner
->arch
.tbacct_lock
);
468 static void kvmppc_create_dtl_entry(struct kvm_vcpu
*vcpu
,
469 struct kvmppc_vcore
*vc
)
471 struct dtl_entry
*dt
;
473 unsigned long stolen
;
474 unsigned long core_stolen
;
477 dt
= vcpu
->arch
.dtl_ptr
;
478 vpa
= vcpu
->arch
.vpa
.pinned_addr
;
480 core_stolen
= vcore_stolen_time(vc
, now
);
481 stolen
= core_stolen
- vcpu
->arch
.stolen_logged
;
482 vcpu
->arch
.stolen_logged
= core_stolen
;
483 spin_lock(&vcpu
->arch
.tbacct_lock
);
484 stolen
+= vcpu
->arch
.busy_stolen
;
485 vcpu
->arch
.busy_stolen
= 0;
486 spin_unlock(&vcpu
->arch
.tbacct_lock
);
489 memset(dt
, 0, sizeof(struct dtl_entry
));
490 dt
->dispatch_reason
= 7;
491 dt
->processor_id
= vc
->pcpu
+ vcpu
->arch
.ptid
;
493 dt
->enqueue_to_dispatch_time
= stolen
;
494 dt
->srr0
= kvmppc_get_pc(vcpu
);
495 dt
->srr1
= vcpu
->arch
.shregs
.msr
;
497 if (dt
== vcpu
->arch
.dtl
.pinned_end
)
498 dt
= vcpu
->arch
.dtl
.pinned_addr
;
499 vcpu
->arch
.dtl_ptr
= dt
;
500 /* order writing *dt vs. writing vpa->dtl_idx */
502 vpa
->dtl_idx
= ++vcpu
->arch
.dtl_index
;
503 vcpu
->arch
.dtl
.dirty
= true;
506 int kvmppc_pseries_do_hcall(struct kvm_vcpu
*vcpu
)
508 unsigned long req
= kvmppc_get_gpr(vcpu
, 3);
509 unsigned long target
, ret
= H_SUCCESS
;
510 struct kvm_vcpu
*tvcpu
;
515 idx
= srcu_read_lock(&vcpu
->kvm
->srcu
);
516 ret
= kvmppc_virtmode_h_enter(vcpu
, kvmppc_get_gpr(vcpu
, 4),
517 kvmppc_get_gpr(vcpu
, 5),
518 kvmppc_get_gpr(vcpu
, 6),
519 kvmppc_get_gpr(vcpu
, 7));
520 srcu_read_unlock(&vcpu
->kvm
->srcu
, idx
);
525 target
= kvmppc_get_gpr(vcpu
, 4);
526 tvcpu
= kvmppc_find_vcpu(vcpu
->kvm
, target
);
531 tvcpu
->arch
.prodded
= 1;
533 if (vcpu
->arch
.ceded
) {
534 if (waitqueue_active(&vcpu
->wq
)) {
535 wake_up_interruptible(&vcpu
->wq
);
536 vcpu
->stat
.halt_wakeup
++;
543 ret
= do_h_register_vpa(vcpu
, kvmppc_get_gpr(vcpu
, 4),
544 kvmppc_get_gpr(vcpu
, 5),
545 kvmppc_get_gpr(vcpu
, 6));
548 if (list_empty(&vcpu
->kvm
->arch
.rtas_tokens
))
551 rc
= kvmppc_rtas_hcall(vcpu
);
558 /* Send the error out to userspace via KVM_RUN */
565 if (kvmppc_xics_enabled(vcpu
)) {
566 ret
= kvmppc_xics_hcall(vcpu
, req
);
572 kvmppc_set_gpr(vcpu
, 3, ret
);
573 vcpu
->arch
.hcall_needed
= 0;
577 static int kvmppc_handle_exit(struct kvm_run
*run
, struct kvm_vcpu
*vcpu
,
578 struct task_struct
*tsk
)
582 vcpu
->stat
.sum_exits
++;
584 run
->exit_reason
= KVM_EXIT_UNKNOWN
;
585 run
->ready_for_interrupt_injection
= 1;
586 switch (vcpu
->arch
.trap
) {
587 /* We're good on these - the host merely wanted to get our attention */
588 case BOOK3S_INTERRUPT_HV_DECREMENTER
:
589 vcpu
->stat
.dec_exits
++;
592 case BOOK3S_INTERRUPT_EXTERNAL
:
593 vcpu
->stat
.ext_intr_exits
++;
596 case BOOK3S_INTERRUPT_PERFMON
:
599 case BOOK3S_INTERRUPT_MACHINE_CHECK
:
601 * Deliver a machine check interrupt to the guest.
602 * We have to do this, even if the host has handled the
603 * machine check, because machine checks use SRR0/1 and
604 * the interrupt might have trashed guest state in them.
606 kvmppc_book3s_queue_irqprio(vcpu
,
607 BOOK3S_INTERRUPT_MACHINE_CHECK
);
610 case BOOK3S_INTERRUPT_PROGRAM
:
614 * Normally program interrupts are delivered directly
615 * to the guest by the hardware, but we can get here
616 * as a result of a hypervisor emulation interrupt
617 * (e40) getting turned into a 700 by BML RTAS.
619 flags
= vcpu
->arch
.shregs
.msr
& 0x1f0000ull
;
620 kvmppc_core_queue_program(vcpu
, flags
);
624 case BOOK3S_INTERRUPT_SYSCALL
:
626 /* hcall - punt to userspace */
629 if (vcpu
->arch
.shregs
.msr
& MSR_PR
) {
630 /* sc 1 from userspace - reflect to guest syscall */
631 kvmppc_book3s_queue_irqprio(vcpu
, BOOK3S_INTERRUPT_SYSCALL
);
635 run
->papr_hcall
.nr
= kvmppc_get_gpr(vcpu
, 3);
636 for (i
= 0; i
< 9; ++i
)
637 run
->papr_hcall
.args
[i
] = kvmppc_get_gpr(vcpu
, 4 + i
);
638 run
->exit_reason
= KVM_EXIT_PAPR_HCALL
;
639 vcpu
->arch
.hcall_needed
= 1;
644 * We get these next two if the guest accesses a page which it thinks
645 * it has mapped but which is not actually present, either because
646 * it is for an emulated I/O device or because the corresonding
647 * host page has been paged out. Any other HDSI/HISI interrupts
648 * have been handled already.
650 case BOOK3S_INTERRUPT_H_DATA_STORAGE
:
651 r
= RESUME_PAGE_FAULT
;
653 case BOOK3S_INTERRUPT_H_INST_STORAGE
:
654 vcpu
->arch
.fault_dar
= kvmppc_get_pc(vcpu
);
655 vcpu
->arch
.fault_dsisr
= 0;
656 r
= RESUME_PAGE_FAULT
;
659 * This occurs if the guest executes an illegal instruction.
660 * We just generate a program interrupt to the guest, since
661 * we don't emulate any guest instructions at this stage.
663 case BOOK3S_INTERRUPT_H_EMUL_ASSIST
:
664 kvmppc_core_queue_program(vcpu
, 0x80000);
668 kvmppc_dump_regs(vcpu
);
669 printk(KERN_EMERG
"trap=0x%x | pc=0x%lx | msr=0x%llx\n",
670 vcpu
->arch
.trap
, kvmppc_get_pc(vcpu
),
671 vcpu
->arch
.shregs
.msr
);
680 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu
*vcpu
,
681 struct kvm_sregs
*sregs
)
685 sregs
->pvr
= vcpu
->arch
.pvr
;
687 memset(sregs
, 0, sizeof(struct kvm_sregs
));
688 for (i
= 0; i
< vcpu
->arch
.slb_max
; i
++) {
689 sregs
->u
.s
.ppc64
.slb
[i
].slbe
= vcpu
->arch
.slb
[i
].orige
;
690 sregs
->u
.s
.ppc64
.slb
[i
].slbv
= vcpu
->arch
.slb
[i
].origv
;
696 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu
*vcpu
,
697 struct kvm_sregs
*sregs
)
701 kvmppc_set_pvr(vcpu
, sregs
->pvr
);
704 for (i
= 0; i
< vcpu
->arch
.slb_nr
; i
++) {
705 if (sregs
->u
.s
.ppc64
.slb
[i
].slbe
& SLB_ESID_V
) {
706 vcpu
->arch
.slb
[j
].orige
= sregs
->u
.s
.ppc64
.slb
[i
].slbe
;
707 vcpu
->arch
.slb
[j
].origv
= sregs
->u
.s
.ppc64
.slb
[i
].slbv
;
711 vcpu
->arch
.slb_max
= j
;
716 int kvmppc_get_one_reg(struct kvm_vcpu
*vcpu
, u64 id
, union kvmppc_one_reg
*val
)
722 case KVM_REG_PPC_HIOR
:
723 *val
= get_reg_val(id
, 0);
725 case KVM_REG_PPC_DABR
:
726 *val
= get_reg_val(id
, vcpu
->arch
.dabr
);
728 case KVM_REG_PPC_DSCR
:
729 *val
= get_reg_val(id
, vcpu
->arch
.dscr
);
731 case KVM_REG_PPC_PURR
:
732 *val
= get_reg_val(id
, vcpu
->arch
.purr
);
734 case KVM_REG_PPC_SPURR
:
735 *val
= get_reg_val(id
, vcpu
->arch
.spurr
);
737 case KVM_REG_PPC_AMR
:
738 *val
= get_reg_val(id
, vcpu
->arch
.amr
);
740 case KVM_REG_PPC_UAMOR
:
741 *val
= get_reg_val(id
, vcpu
->arch
.uamor
);
743 case KVM_REG_PPC_MMCR0
... KVM_REG_PPC_MMCRA
:
744 i
= id
- KVM_REG_PPC_MMCR0
;
745 *val
= get_reg_val(id
, vcpu
->arch
.mmcr
[i
]);
747 case KVM_REG_PPC_PMC1
... KVM_REG_PPC_PMC8
:
748 i
= id
- KVM_REG_PPC_PMC1
;
749 *val
= get_reg_val(id
, vcpu
->arch
.pmc
[i
]);
752 case KVM_REG_PPC_FPR0
... KVM_REG_PPC_FPR31
:
753 if (cpu_has_feature(CPU_FTR_VSX
)) {
754 /* VSX => FP reg i is stored in arch.vsr[2*i] */
755 long int i
= id
- KVM_REG_PPC_FPR0
;
756 *val
= get_reg_val(id
, vcpu
->arch
.vsr
[2 * i
]);
758 /* let generic code handle it */
762 case KVM_REG_PPC_VSR0
... KVM_REG_PPC_VSR31
:
763 if (cpu_has_feature(CPU_FTR_VSX
)) {
764 long int i
= id
- KVM_REG_PPC_VSR0
;
765 val
->vsxval
[0] = vcpu
->arch
.vsr
[2 * i
];
766 val
->vsxval
[1] = vcpu
->arch
.vsr
[2 * i
+ 1];
771 #endif /* CONFIG_VSX */
772 case KVM_REG_PPC_VPA_ADDR
:
773 spin_lock(&vcpu
->arch
.vpa_update_lock
);
774 *val
= get_reg_val(id
, vcpu
->arch
.vpa
.next_gpa
);
775 spin_unlock(&vcpu
->arch
.vpa_update_lock
);
777 case KVM_REG_PPC_VPA_SLB
:
778 spin_lock(&vcpu
->arch
.vpa_update_lock
);
779 val
->vpaval
.addr
= vcpu
->arch
.slb_shadow
.next_gpa
;
780 val
->vpaval
.length
= vcpu
->arch
.slb_shadow
.len
;
781 spin_unlock(&vcpu
->arch
.vpa_update_lock
);
783 case KVM_REG_PPC_VPA_DTL
:
784 spin_lock(&vcpu
->arch
.vpa_update_lock
);
785 val
->vpaval
.addr
= vcpu
->arch
.dtl
.next_gpa
;
786 val
->vpaval
.length
= vcpu
->arch
.dtl
.len
;
787 spin_unlock(&vcpu
->arch
.vpa_update_lock
);
797 int kvmppc_set_one_reg(struct kvm_vcpu
*vcpu
, u64 id
, union kvmppc_one_reg
*val
)
801 unsigned long addr
, len
;
804 case KVM_REG_PPC_HIOR
:
805 /* Only allow this to be set to zero */
806 if (set_reg_val(id
, *val
))
809 case KVM_REG_PPC_DABR
:
810 vcpu
->arch
.dabr
= set_reg_val(id
, *val
);
812 case KVM_REG_PPC_DSCR
:
813 vcpu
->arch
.dscr
= set_reg_val(id
, *val
);
815 case KVM_REG_PPC_PURR
:
816 vcpu
->arch
.purr
= set_reg_val(id
, *val
);
818 case KVM_REG_PPC_SPURR
:
819 vcpu
->arch
.spurr
= set_reg_val(id
, *val
);
821 case KVM_REG_PPC_AMR
:
822 vcpu
->arch
.amr
= set_reg_val(id
, *val
);
824 case KVM_REG_PPC_UAMOR
:
825 vcpu
->arch
.uamor
= set_reg_val(id
, *val
);
827 case KVM_REG_PPC_MMCR0
... KVM_REG_PPC_MMCRA
:
828 i
= id
- KVM_REG_PPC_MMCR0
;
829 vcpu
->arch
.mmcr
[i
] = set_reg_val(id
, *val
);
831 case KVM_REG_PPC_PMC1
... KVM_REG_PPC_PMC8
:
832 i
= id
- KVM_REG_PPC_PMC1
;
833 vcpu
->arch
.pmc
[i
] = set_reg_val(id
, *val
);
836 case KVM_REG_PPC_FPR0
... KVM_REG_PPC_FPR31
:
837 if (cpu_has_feature(CPU_FTR_VSX
)) {
838 /* VSX => FP reg i is stored in arch.vsr[2*i] */
839 long int i
= id
- KVM_REG_PPC_FPR0
;
840 vcpu
->arch
.vsr
[2 * i
] = set_reg_val(id
, *val
);
842 /* let generic code handle it */
846 case KVM_REG_PPC_VSR0
... KVM_REG_PPC_VSR31
:
847 if (cpu_has_feature(CPU_FTR_VSX
)) {
848 long int i
= id
- KVM_REG_PPC_VSR0
;
849 vcpu
->arch
.vsr
[2 * i
] = val
->vsxval
[0];
850 vcpu
->arch
.vsr
[2 * i
+ 1] = val
->vsxval
[1];
855 #endif /* CONFIG_VSX */
856 case KVM_REG_PPC_VPA_ADDR
:
857 addr
= set_reg_val(id
, *val
);
859 if (!addr
&& (vcpu
->arch
.slb_shadow
.next_gpa
||
860 vcpu
->arch
.dtl
.next_gpa
))
862 r
= set_vpa(vcpu
, &vcpu
->arch
.vpa
, addr
, sizeof(struct lppaca
));
864 case KVM_REG_PPC_VPA_SLB
:
865 addr
= val
->vpaval
.addr
;
866 len
= val
->vpaval
.length
;
868 if (addr
&& !vcpu
->arch
.vpa
.next_gpa
)
870 r
= set_vpa(vcpu
, &vcpu
->arch
.slb_shadow
, addr
, len
);
872 case KVM_REG_PPC_VPA_DTL
:
873 addr
= val
->vpaval
.addr
;
874 len
= val
->vpaval
.length
;
876 if (addr
&& (len
< sizeof(struct dtl_entry
) ||
877 !vcpu
->arch
.vpa
.next_gpa
))
879 len
-= len
% sizeof(struct dtl_entry
);
880 r
= set_vpa(vcpu
, &vcpu
->arch
.dtl
, addr
, len
);
890 int kvmppc_core_check_processor_compat(void)
892 if (cpu_has_feature(CPU_FTR_HVMODE
))
897 struct kvm_vcpu
*kvmppc_core_vcpu_create(struct kvm
*kvm
, unsigned int id
)
899 struct kvm_vcpu
*vcpu
;
902 struct kvmppc_vcore
*vcore
;
904 core
= id
/ threads_per_core
;
905 if (core
>= KVM_MAX_VCORES
)
909 vcpu
= kmem_cache_zalloc(kvm_vcpu_cache
, GFP_KERNEL
);
913 err
= kvm_vcpu_init(vcpu
, kvm
, id
);
917 vcpu
->arch
.shared
= &vcpu
->arch
.shregs
;
918 vcpu
->arch
.mmcr
[0] = MMCR0_FC
;
919 vcpu
->arch
.ctrl
= CTRL_RUNLATCH
;
920 /* default to host PVR, since we can't spoof it */
921 vcpu
->arch
.pvr
= mfspr(SPRN_PVR
);
922 kvmppc_set_pvr(vcpu
, vcpu
->arch
.pvr
);
923 spin_lock_init(&vcpu
->arch
.vpa_update_lock
);
924 spin_lock_init(&vcpu
->arch
.tbacct_lock
);
925 vcpu
->arch
.busy_preempt
= TB_NIL
;
927 kvmppc_mmu_book3s_hv_init(vcpu
);
929 vcpu
->arch
.state
= KVMPPC_VCPU_NOTREADY
;
931 init_waitqueue_head(&vcpu
->arch
.cpu_run
);
933 mutex_lock(&kvm
->lock
);
934 vcore
= kvm
->arch
.vcores
[core
];
936 vcore
= kzalloc(sizeof(struct kvmppc_vcore
), GFP_KERNEL
);
938 INIT_LIST_HEAD(&vcore
->runnable_threads
);
939 spin_lock_init(&vcore
->lock
);
940 init_waitqueue_head(&vcore
->wq
);
941 vcore
->preempt_tb
= TB_NIL
;
943 kvm
->arch
.vcores
[core
] = vcore
;
944 kvm
->arch
.online_vcores
++;
946 mutex_unlock(&kvm
->lock
);
951 spin_lock(&vcore
->lock
);
952 ++vcore
->num_threads
;
953 spin_unlock(&vcore
->lock
);
954 vcpu
->arch
.vcore
= vcore
;
956 vcpu
->arch
.cpu_type
= KVM_CPU_3S_64
;
957 kvmppc_sanity_check(vcpu
);
962 kmem_cache_free(kvm_vcpu_cache
, vcpu
);
967 static void unpin_vpa(struct kvm
*kvm
, struct kvmppc_vpa
*vpa
)
969 if (vpa
->pinned_addr
)
970 kvmppc_unpin_guest_page(kvm
, vpa
->pinned_addr
, vpa
->gpa
,
974 void kvmppc_core_vcpu_free(struct kvm_vcpu
*vcpu
)
976 spin_lock(&vcpu
->arch
.vpa_update_lock
);
977 unpin_vpa(vcpu
->kvm
, &vcpu
->arch
.dtl
);
978 unpin_vpa(vcpu
->kvm
, &vcpu
->arch
.slb_shadow
);
979 unpin_vpa(vcpu
->kvm
, &vcpu
->arch
.vpa
);
980 spin_unlock(&vcpu
->arch
.vpa_update_lock
);
981 kvm_vcpu_uninit(vcpu
);
982 kmem_cache_free(kvm_vcpu_cache
, vcpu
);
985 static void kvmppc_set_timer(struct kvm_vcpu
*vcpu
)
987 unsigned long dec_nsec
, now
;
990 if (now
> vcpu
->arch
.dec_expires
) {
991 /* decrementer has already gone negative */
992 kvmppc_core_queue_dec(vcpu
);
993 kvmppc_core_prepare_to_enter(vcpu
);
996 dec_nsec
= (vcpu
->arch
.dec_expires
- now
) * NSEC_PER_SEC
998 hrtimer_start(&vcpu
->arch
.dec_timer
, ktime_set(0, dec_nsec
),
1000 vcpu
->arch
.timer_running
= 1;
1003 static void kvmppc_end_cede(struct kvm_vcpu
*vcpu
)
1005 vcpu
->arch
.ceded
= 0;
1006 if (vcpu
->arch
.timer_running
) {
1007 hrtimer_try_to_cancel(&vcpu
->arch
.dec_timer
);
1008 vcpu
->arch
.timer_running
= 0;
1012 extern int __kvmppc_vcore_entry(struct kvm_run
*kvm_run
, struct kvm_vcpu
*vcpu
);
1014 static void kvmppc_remove_runnable(struct kvmppc_vcore
*vc
,
1015 struct kvm_vcpu
*vcpu
)
1019 if (vcpu
->arch
.state
!= KVMPPC_VCPU_RUNNABLE
)
1021 spin_lock(&vcpu
->arch
.tbacct_lock
);
1023 vcpu
->arch
.busy_stolen
+= vcore_stolen_time(vc
, now
) -
1024 vcpu
->arch
.stolen_logged
;
1025 vcpu
->arch
.busy_preempt
= now
;
1026 vcpu
->arch
.state
= KVMPPC_VCPU_BUSY_IN_HOST
;
1027 spin_unlock(&vcpu
->arch
.tbacct_lock
);
1029 list_del(&vcpu
->arch
.run_list
);
1032 static int kvmppc_grab_hwthread(int cpu
)
1034 struct paca_struct
*tpaca
;
1035 long timeout
= 1000;
1039 /* Ensure the thread won't go into the kernel if it wakes */
1040 tpaca
->kvm_hstate
.hwthread_req
= 1;
1041 tpaca
->kvm_hstate
.kvm_vcpu
= NULL
;
1044 * If the thread is already executing in the kernel (e.g. handling
1045 * a stray interrupt), wait for it to get back to nap mode.
1046 * The smp_mb() is to ensure that our setting of hwthread_req
1047 * is visible before we look at hwthread_state, so if this
1048 * races with the code at system_reset_pSeries and the thread
1049 * misses our setting of hwthread_req, we are sure to see its
1050 * setting of hwthread_state, and vice versa.
1053 while (tpaca
->kvm_hstate
.hwthread_state
== KVM_HWTHREAD_IN_KERNEL
) {
1054 if (--timeout
<= 0) {
1055 pr_err("KVM: couldn't grab cpu %d\n", cpu
);
1063 static void kvmppc_release_hwthread(int cpu
)
1065 struct paca_struct
*tpaca
;
1068 tpaca
->kvm_hstate
.hwthread_req
= 0;
1069 tpaca
->kvm_hstate
.kvm_vcpu
= NULL
;
1072 static void kvmppc_start_thread(struct kvm_vcpu
*vcpu
)
1075 struct paca_struct
*tpaca
;
1076 struct kvmppc_vcore
*vc
= vcpu
->arch
.vcore
;
1078 if (vcpu
->arch
.timer_running
) {
1079 hrtimer_try_to_cancel(&vcpu
->arch
.dec_timer
);
1080 vcpu
->arch
.timer_running
= 0;
1082 cpu
= vc
->pcpu
+ vcpu
->arch
.ptid
;
1084 tpaca
->kvm_hstate
.kvm_vcpu
= vcpu
;
1085 tpaca
->kvm_hstate
.kvm_vcore
= vc
;
1086 tpaca
->kvm_hstate
.napping
= 0;
1087 vcpu
->cpu
= vc
->pcpu
;
1089 #if defined(CONFIG_PPC_ICP_NATIVE) && defined(CONFIG_SMP)
1090 if (vcpu
->arch
.ptid
) {
1097 static void kvmppc_wait_for_nap(struct kvmppc_vcore
*vc
)
1103 while (vc
->nap_count
< vc
->n_woken
) {
1104 if (++i
>= 1000000) {
1105 pr_err("kvmppc_wait_for_nap timeout %d %d\n",
1106 vc
->nap_count
, vc
->n_woken
);
1115 * Check that we are on thread 0 and that any other threads in
1116 * this core are off-line. Then grab the threads so they can't
1119 static int on_primary_thread(void)
1121 int cpu
= smp_processor_id();
1122 int thr
= cpu_thread_in_core(cpu
);
1126 while (++thr
< threads_per_core
)
1127 if (cpu_online(cpu
+ thr
))
1130 /* Grab all hw threads so they can't go into the kernel */
1131 for (thr
= 1; thr
< threads_per_core
; ++thr
) {
1132 if (kvmppc_grab_hwthread(cpu
+ thr
)) {
1133 /* Couldn't grab one; let the others go */
1135 kvmppc_release_hwthread(cpu
+ thr
);
1136 } while (--thr
> 0);
1144 * Run a set of guest threads on a physical core.
1145 * Called with vc->lock held.
1147 static void kvmppc_run_core(struct kvmppc_vcore
*vc
)
1149 struct kvm_vcpu
*vcpu
, *vcpu0
, *vnext
;
1152 int ptid
, i
, need_vpa_update
;
1154 struct kvm_vcpu
*vcpus_to_update
[threads_per_core
];
1156 /* don't start if any threads have a signal pending */
1157 need_vpa_update
= 0;
1158 list_for_each_entry(vcpu
, &vc
->runnable_threads
, arch
.run_list
) {
1159 if (signal_pending(vcpu
->arch
.run_task
))
1161 if (vcpu
->arch
.vpa
.update_pending
||
1162 vcpu
->arch
.slb_shadow
.update_pending
||
1163 vcpu
->arch
.dtl
.update_pending
)
1164 vcpus_to_update
[need_vpa_update
++] = vcpu
;
1168 * Initialize *vc, in particular vc->vcore_state, so we can
1169 * drop the vcore lock if necessary.
1173 vc
->entry_exit_count
= 0;
1174 vc
->vcore_state
= VCORE_STARTING
;
1176 vc
->napping_threads
= 0;
1179 * Updating any of the vpas requires calling kvmppc_pin_guest_page,
1180 * which can't be called with any spinlocks held.
1182 if (need_vpa_update
) {
1183 spin_unlock(&vc
->lock
);
1184 for (i
= 0; i
< need_vpa_update
; ++i
)
1185 kvmppc_update_vpas(vcpus_to_update
[i
]);
1186 spin_lock(&vc
->lock
);
1190 * Assign physical thread IDs, first to non-ceded vcpus
1191 * and then to ceded ones.
1195 list_for_each_entry(vcpu
, &vc
->runnable_threads
, arch
.run_list
) {
1196 if (!vcpu
->arch
.ceded
) {
1199 vcpu
->arch
.ptid
= ptid
++;
1203 goto out
; /* nothing to run; should never happen */
1204 list_for_each_entry(vcpu
, &vc
->runnable_threads
, arch
.run_list
)
1205 if (vcpu
->arch
.ceded
)
1206 vcpu
->arch
.ptid
= ptid
++;
1209 * Make sure we are running on thread 0, and that
1210 * secondary threads are offline.
1212 if (threads_per_core
> 1 && !on_primary_thread()) {
1213 list_for_each_entry(vcpu
, &vc
->runnable_threads
, arch
.run_list
)
1214 vcpu
->arch
.ret
= -EBUSY
;
1218 vc
->pcpu
= smp_processor_id();
1219 list_for_each_entry(vcpu
, &vc
->runnable_threads
, arch
.run_list
) {
1220 kvmppc_start_thread(vcpu
);
1221 kvmppc_create_dtl_entry(vcpu
, vc
);
1224 vc
->vcore_state
= VCORE_RUNNING
;
1226 spin_unlock(&vc
->lock
);
1230 srcu_idx
= srcu_read_lock(&vcpu0
->kvm
->srcu
);
1232 __kvmppc_vcore_entry(NULL
, vcpu0
);
1234 spin_lock(&vc
->lock
);
1235 /* disable sending of IPIs on virtual external irqs */
1236 list_for_each_entry(vcpu
, &vc
->runnable_threads
, arch
.run_list
)
1238 /* wait for secondary threads to finish writing their state to memory */
1239 if (vc
->nap_count
< vc
->n_woken
)
1240 kvmppc_wait_for_nap(vc
);
1241 for (i
= 0; i
< threads_per_core
; ++i
)
1242 kvmppc_release_hwthread(vc
->pcpu
+ i
);
1243 /* prevent other vcpu threads from doing kvmppc_start_thread() now */
1244 vc
->vcore_state
= VCORE_EXITING
;
1245 spin_unlock(&vc
->lock
);
1247 srcu_read_unlock(&vcpu0
->kvm
->srcu
, srcu_idx
);
1249 /* make sure updates to secondary vcpu structs are visible now */
1256 spin_lock(&vc
->lock
);
1258 list_for_each_entry(vcpu
, &vc
->runnable_threads
, arch
.run_list
) {
1259 /* cancel pending dec exception if dec is positive */
1260 if (now
< vcpu
->arch
.dec_expires
&&
1261 kvmppc_core_pending_dec(vcpu
))
1262 kvmppc_core_dequeue_dec(vcpu
);
1265 if (vcpu
->arch
.trap
)
1266 ret
= kvmppc_handle_exit(vcpu
->arch
.kvm_run
, vcpu
,
1267 vcpu
->arch
.run_task
);
1269 vcpu
->arch
.ret
= ret
;
1270 vcpu
->arch
.trap
= 0;
1272 if (vcpu
->arch
.ceded
) {
1273 if (ret
!= RESUME_GUEST
)
1274 kvmppc_end_cede(vcpu
);
1276 kvmppc_set_timer(vcpu
);
1281 vc
->vcore_state
= VCORE_INACTIVE
;
1282 list_for_each_entry_safe(vcpu
, vnext
, &vc
->runnable_threads
,
1284 if (vcpu
->arch
.ret
!= RESUME_GUEST
) {
1285 kvmppc_remove_runnable(vc
, vcpu
);
1286 wake_up(&vcpu
->arch
.cpu_run
);
1292 * Wait for some other vcpu thread to execute us, and
1293 * wake us up when we need to handle something in the host.
1295 static void kvmppc_wait_for_exec(struct kvm_vcpu
*vcpu
, int wait_state
)
1299 prepare_to_wait(&vcpu
->arch
.cpu_run
, &wait
, wait_state
);
1300 if (vcpu
->arch
.state
== KVMPPC_VCPU_RUNNABLE
)
1302 finish_wait(&vcpu
->arch
.cpu_run
, &wait
);
1306 * All the vcpus in this vcore are idle, so wait for a decrementer
1307 * or external interrupt to one of the vcpus. vc->lock is held.
1309 static void kvmppc_vcore_blocked(struct kvmppc_vcore
*vc
)
1313 prepare_to_wait(&vc
->wq
, &wait
, TASK_INTERRUPTIBLE
);
1314 vc
->vcore_state
= VCORE_SLEEPING
;
1315 spin_unlock(&vc
->lock
);
1317 finish_wait(&vc
->wq
, &wait
);
1318 spin_lock(&vc
->lock
);
1319 vc
->vcore_state
= VCORE_INACTIVE
;
1322 static int kvmppc_run_vcpu(struct kvm_run
*kvm_run
, struct kvm_vcpu
*vcpu
)
1325 struct kvmppc_vcore
*vc
;
1326 struct kvm_vcpu
*v
, *vn
;
1328 kvm_run
->exit_reason
= 0;
1329 vcpu
->arch
.ret
= RESUME_GUEST
;
1330 vcpu
->arch
.trap
= 0;
1331 kvmppc_update_vpas(vcpu
);
1334 * Synchronize with other threads in this virtual core
1336 vc
= vcpu
->arch
.vcore
;
1337 spin_lock(&vc
->lock
);
1338 vcpu
->arch
.ceded
= 0;
1339 vcpu
->arch
.run_task
= current
;
1340 vcpu
->arch
.kvm_run
= kvm_run
;
1341 vcpu
->arch
.stolen_logged
= vcore_stolen_time(vc
, mftb());
1342 vcpu
->arch
.state
= KVMPPC_VCPU_RUNNABLE
;
1343 vcpu
->arch
.busy_preempt
= TB_NIL
;
1344 list_add_tail(&vcpu
->arch
.run_list
, &vc
->runnable_threads
);
1348 * This happens the first time this is called for a vcpu.
1349 * If the vcore is already running, we may be able to start
1350 * this thread straight away and have it join in.
1352 if (!signal_pending(current
)) {
1353 if (vc
->vcore_state
== VCORE_RUNNING
&&
1354 VCORE_EXIT_COUNT(vc
) == 0) {
1355 vcpu
->arch
.ptid
= vc
->n_runnable
- 1;
1356 kvmppc_create_dtl_entry(vcpu
, vc
);
1357 kvmppc_start_thread(vcpu
);
1358 } else if (vc
->vcore_state
== VCORE_SLEEPING
) {
1364 while (vcpu
->arch
.state
== KVMPPC_VCPU_RUNNABLE
&&
1365 !signal_pending(current
)) {
1366 if (vc
->vcore_state
!= VCORE_INACTIVE
) {
1367 spin_unlock(&vc
->lock
);
1368 kvmppc_wait_for_exec(vcpu
, TASK_INTERRUPTIBLE
);
1369 spin_lock(&vc
->lock
);
1372 list_for_each_entry_safe(v
, vn
, &vc
->runnable_threads
,
1374 kvmppc_core_prepare_to_enter(v
);
1375 if (signal_pending(v
->arch
.run_task
)) {
1376 kvmppc_remove_runnable(vc
, v
);
1377 v
->stat
.signal_exits
++;
1378 v
->arch
.kvm_run
->exit_reason
= KVM_EXIT_INTR
;
1379 v
->arch
.ret
= -EINTR
;
1380 wake_up(&v
->arch
.cpu_run
);
1383 if (!vc
->n_runnable
|| vcpu
->arch
.state
!= KVMPPC_VCPU_RUNNABLE
)
1387 list_for_each_entry(v
, &vc
->runnable_threads
, arch
.run_list
) {
1388 if (!v
->arch
.pending_exceptions
)
1389 n_ceded
+= v
->arch
.ceded
;
1393 if (n_ceded
== vc
->n_runnable
)
1394 kvmppc_vcore_blocked(vc
);
1396 kvmppc_run_core(vc
);
1400 while (vcpu
->arch
.state
== KVMPPC_VCPU_RUNNABLE
&&
1401 (vc
->vcore_state
== VCORE_RUNNING
||
1402 vc
->vcore_state
== VCORE_EXITING
)) {
1403 spin_unlock(&vc
->lock
);
1404 kvmppc_wait_for_exec(vcpu
, TASK_UNINTERRUPTIBLE
);
1405 spin_lock(&vc
->lock
);
1408 if (vcpu
->arch
.state
== KVMPPC_VCPU_RUNNABLE
) {
1409 kvmppc_remove_runnable(vc
, vcpu
);
1410 vcpu
->stat
.signal_exits
++;
1411 kvm_run
->exit_reason
= KVM_EXIT_INTR
;
1412 vcpu
->arch
.ret
= -EINTR
;
1415 if (vc
->n_runnable
&& vc
->vcore_state
== VCORE_INACTIVE
) {
1416 /* Wake up some vcpu to run the core */
1417 v
= list_first_entry(&vc
->runnable_threads
,
1418 struct kvm_vcpu
, arch
.run_list
);
1419 wake_up(&v
->arch
.cpu_run
);
1422 spin_unlock(&vc
->lock
);
1423 return vcpu
->arch
.ret
;
1426 int kvmppc_vcpu_run(struct kvm_run
*run
, struct kvm_vcpu
*vcpu
)
1431 if (!vcpu
->arch
.sane
) {
1432 run
->exit_reason
= KVM_EXIT_INTERNAL_ERROR
;
1436 kvmppc_core_prepare_to_enter(vcpu
);
1438 /* No need to go into the guest when all we'll do is come back out */
1439 if (signal_pending(current
)) {
1440 run
->exit_reason
= KVM_EXIT_INTR
;
1444 atomic_inc(&vcpu
->kvm
->arch
.vcpus_running
);
1445 /* Order vcpus_running vs. rma_setup_done, see kvmppc_alloc_reset_hpt */
1448 /* On the first time here, set up HTAB and VRMA or RMA */
1449 if (!vcpu
->kvm
->arch
.rma_setup_done
) {
1450 r
= kvmppc_hv_setup_htab_rma(vcpu
);
1455 flush_fp_to_thread(current
);
1456 flush_altivec_to_thread(current
);
1457 flush_vsx_to_thread(current
);
1458 vcpu
->arch
.wqp
= &vcpu
->arch
.vcore
->wq
;
1459 vcpu
->arch
.pgdir
= current
->mm
->pgd
;
1460 vcpu
->arch
.state
= KVMPPC_VCPU_BUSY_IN_HOST
;
1463 r
= kvmppc_run_vcpu(run
, vcpu
);
1465 if (run
->exit_reason
== KVM_EXIT_PAPR_HCALL
&&
1466 !(vcpu
->arch
.shregs
.msr
& MSR_PR
)) {
1467 r
= kvmppc_pseries_do_hcall(vcpu
);
1468 kvmppc_core_prepare_to_enter(vcpu
);
1469 } else if (r
== RESUME_PAGE_FAULT
) {
1470 srcu_idx
= srcu_read_lock(&vcpu
->kvm
->srcu
);
1471 r
= kvmppc_book3s_hv_page_fault(run
, vcpu
,
1472 vcpu
->arch
.fault_dar
, vcpu
->arch
.fault_dsisr
);
1473 srcu_read_unlock(&vcpu
->kvm
->srcu
, srcu_idx
);
1475 } while (r
== RESUME_GUEST
);
1478 vcpu
->arch
.state
= KVMPPC_VCPU_NOTREADY
;
1479 atomic_dec(&vcpu
->kvm
->arch
.vcpus_running
);
1484 /* Work out RMLS (real mode limit selector) field value for a given RMA size.
1485 Assumes POWER7 or PPC970. */
1486 static inline int lpcr_rmls(unsigned long rma_size
)
1489 case 32ul << 20: /* 32 MB */
1490 if (cpu_has_feature(CPU_FTR_ARCH_206
))
1491 return 8; /* only supported on POWER7 */
1493 case 64ul << 20: /* 64 MB */
1495 case 128ul << 20: /* 128 MB */
1497 case 256ul << 20: /* 256 MB */
1499 case 1ul << 30: /* 1 GB */
1501 case 16ul << 30: /* 16 GB */
1503 case 256ul << 30: /* 256 GB */
1510 static int kvm_rma_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1512 struct kvmppc_linear_info
*ri
= vma
->vm_file
->private_data
;
1515 if (vmf
->pgoff
>= ri
->npages
)
1516 return VM_FAULT_SIGBUS
;
1518 page
= pfn_to_page(ri
->base_pfn
+ vmf
->pgoff
);
1524 static const struct vm_operations_struct kvm_rma_vm_ops
= {
1525 .fault
= kvm_rma_fault
,
1528 static int kvm_rma_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1530 vma
->vm_flags
|= VM_DONTEXPAND
| VM_DONTDUMP
;
1531 vma
->vm_ops
= &kvm_rma_vm_ops
;
1535 static int kvm_rma_release(struct inode
*inode
, struct file
*filp
)
1537 struct kvmppc_linear_info
*ri
= filp
->private_data
;
1539 kvm_release_rma(ri
);
1543 static const struct file_operations kvm_rma_fops
= {
1544 .mmap
= kvm_rma_mmap
,
1545 .release
= kvm_rma_release
,
1548 long kvm_vm_ioctl_allocate_rma(struct kvm
*kvm
, struct kvm_allocate_rma
*ret
)
1550 struct kvmppc_linear_info
*ri
;
1553 ri
= kvm_alloc_rma();
1557 fd
= anon_inode_getfd("kvm-rma", &kvm_rma_fops
, ri
, O_RDWR
);
1559 kvm_release_rma(ri
);
1561 ret
->rma_size
= ri
->npages
<< PAGE_SHIFT
;
1565 static void kvmppc_add_seg_page_size(struct kvm_ppc_one_seg_page_size
**sps
,
1568 struct mmu_psize_def
*def
= &mmu_psize_defs
[linux_psize
];
1572 (*sps
)->page_shift
= def
->shift
;
1573 (*sps
)->slb_enc
= def
->sllp
;
1574 (*sps
)->enc
[0].page_shift
= def
->shift
;
1576 * Only return base page encoding. We don't want to return
1577 * all the supporting pte_enc, because our H_ENTER doesn't
1578 * support MPSS yet. Once they do, we can start passing all
1579 * support pte_enc here
1581 (*sps
)->enc
[0].pte_enc
= def
->penc
[linux_psize
];
1585 int kvm_vm_ioctl_get_smmu_info(struct kvm
*kvm
, struct kvm_ppc_smmu_info
*info
)
1587 struct kvm_ppc_one_seg_page_size
*sps
;
1589 info
->flags
= KVM_PPC_PAGE_SIZES_REAL
;
1590 if (mmu_has_feature(MMU_FTR_1T_SEGMENT
))
1591 info
->flags
|= KVM_PPC_1T_SEGMENTS
;
1592 info
->slb_size
= mmu_slb_size
;
1594 /* We only support these sizes for now, and no muti-size segments */
1595 sps
= &info
->sps
[0];
1596 kvmppc_add_seg_page_size(&sps
, MMU_PAGE_4K
);
1597 kvmppc_add_seg_page_size(&sps
, MMU_PAGE_64K
);
1598 kvmppc_add_seg_page_size(&sps
, MMU_PAGE_16M
);
1604 * Get (and clear) the dirty memory log for a memory slot.
1606 int kvm_vm_ioctl_get_dirty_log(struct kvm
*kvm
, struct kvm_dirty_log
*log
)
1608 struct kvm_memory_slot
*memslot
;
1612 mutex_lock(&kvm
->slots_lock
);
1615 if (log
->slot
>= KVM_USER_MEM_SLOTS
)
1618 memslot
= id_to_memslot(kvm
->memslots
, log
->slot
);
1620 if (!memslot
->dirty_bitmap
)
1623 n
= kvm_dirty_bitmap_bytes(memslot
);
1624 memset(memslot
->dirty_bitmap
, 0, n
);
1626 r
= kvmppc_hv_get_dirty_log(kvm
, memslot
, memslot
->dirty_bitmap
);
1631 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
1636 mutex_unlock(&kvm
->slots_lock
);
1640 static void unpin_slot(struct kvm_memory_slot
*memslot
)
1642 unsigned long *physp
;
1643 unsigned long j
, npages
, pfn
;
1646 physp
= memslot
->arch
.slot_phys
;
1647 npages
= memslot
->npages
;
1650 for (j
= 0; j
< npages
; j
++) {
1651 if (!(physp
[j
] & KVMPPC_GOT_PAGE
))
1653 pfn
= physp
[j
] >> PAGE_SHIFT
;
1654 page
= pfn_to_page(pfn
);
1660 void kvmppc_core_free_memslot(struct kvm_memory_slot
*free
,
1661 struct kvm_memory_slot
*dont
)
1663 if (!dont
|| free
->arch
.rmap
!= dont
->arch
.rmap
) {
1664 vfree(free
->arch
.rmap
);
1665 free
->arch
.rmap
= NULL
;
1667 if (!dont
|| free
->arch
.slot_phys
!= dont
->arch
.slot_phys
) {
1669 vfree(free
->arch
.slot_phys
);
1670 free
->arch
.slot_phys
= NULL
;
1674 int kvmppc_core_create_memslot(struct kvm_memory_slot
*slot
,
1675 unsigned long npages
)
1677 slot
->arch
.rmap
= vzalloc(npages
* sizeof(*slot
->arch
.rmap
));
1678 if (!slot
->arch
.rmap
)
1680 slot
->arch
.slot_phys
= NULL
;
1685 int kvmppc_core_prepare_memory_region(struct kvm
*kvm
,
1686 struct kvm_memory_slot
*memslot
,
1687 struct kvm_userspace_memory_region
*mem
)
1689 unsigned long *phys
;
1691 /* Allocate a slot_phys array if needed */
1692 phys
= memslot
->arch
.slot_phys
;
1693 if (!kvm
->arch
.using_mmu_notifiers
&& !phys
&& memslot
->npages
) {
1694 phys
= vzalloc(memslot
->npages
* sizeof(unsigned long));
1697 memslot
->arch
.slot_phys
= phys
;
1703 void kvmppc_core_commit_memory_region(struct kvm
*kvm
,
1704 struct kvm_userspace_memory_region
*mem
,
1705 const struct kvm_memory_slot
*old
)
1707 unsigned long npages
= mem
->memory_size
>> PAGE_SHIFT
;
1708 struct kvm_memory_slot
*memslot
;
1710 if (npages
&& old
->npages
) {
1712 * If modifying a memslot, reset all the rmap dirty bits.
1713 * If this is a new memslot, we don't need to do anything
1714 * since the rmap array starts out as all zeroes,
1715 * i.e. no pages are dirty.
1717 memslot
= id_to_memslot(kvm
->memslots
, mem
->slot
);
1718 kvmppc_hv_get_dirty_log(kvm
, memslot
, NULL
);
1722 static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu
*vcpu
)
1725 struct kvm
*kvm
= vcpu
->kvm
;
1726 struct kvmppc_linear_info
*ri
= NULL
;
1728 struct kvm_memory_slot
*memslot
;
1729 struct vm_area_struct
*vma
;
1730 unsigned long lpcr
, senc
;
1731 unsigned long psize
, porder
;
1732 unsigned long rma_size
;
1734 unsigned long *physp
;
1735 unsigned long i
, npages
;
1738 mutex_lock(&kvm
->lock
);
1739 if (kvm
->arch
.rma_setup_done
)
1740 goto out
; /* another vcpu beat us to it */
1742 /* Allocate hashed page table (if not done already) and reset it */
1743 if (!kvm
->arch
.hpt_virt
) {
1744 err
= kvmppc_alloc_hpt(kvm
, NULL
);
1746 pr_err("KVM: Couldn't alloc HPT\n");
1751 /* Look up the memslot for guest physical address 0 */
1752 srcu_idx
= srcu_read_lock(&kvm
->srcu
);
1753 memslot
= gfn_to_memslot(kvm
, 0);
1755 /* We must have some memory at 0 by now */
1757 if (!memslot
|| (memslot
->flags
& KVM_MEMSLOT_INVALID
))
1760 /* Look up the VMA for the start of this memory slot */
1761 hva
= memslot
->userspace_addr
;
1762 down_read(¤t
->mm
->mmap_sem
);
1763 vma
= find_vma(current
->mm
, hva
);
1764 if (!vma
|| vma
->vm_start
> hva
|| (vma
->vm_flags
& VM_IO
))
1767 psize
= vma_kernel_pagesize(vma
);
1768 porder
= __ilog2(psize
);
1770 /* Is this one of our preallocated RMAs? */
1771 if (vma
->vm_file
&& vma
->vm_file
->f_op
== &kvm_rma_fops
&&
1772 hva
== vma
->vm_start
)
1773 ri
= vma
->vm_file
->private_data
;
1775 up_read(¤t
->mm
->mmap_sem
);
1778 /* On POWER7, use VRMA; on PPC970, give up */
1780 if (cpu_has_feature(CPU_FTR_ARCH_201
)) {
1781 pr_err("KVM: CPU requires an RMO\n");
1785 /* We can handle 4k, 64k or 16M pages in the VRMA */
1787 if (!(psize
== 0x1000 || psize
== 0x10000 ||
1788 psize
== 0x1000000))
1791 /* Update VRMASD field in the LPCR */
1792 senc
= slb_pgsize_encoding(psize
);
1793 kvm
->arch
.vrma_slb_v
= senc
| SLB_VSID_B_1T
|
1794 (VRMA_VSID
<< SLB_VSID_SHIFT_1T
);
1795 lpcr
= kvm
->arch
.lpcr
& ~LPCR_VRMASD
;
1796 lpcr
|= senc
<< (LPCR_VRMASD_SH
- 4);
1797 kvm
->arch
.lpcr
= lpcr
;
1799 /* Create HPTEs in the hash page table for the VRMA */
1800 kvmppc_map_vrma(vcpu
, memslot
, porder
);
1803 /* Set up to use an RMO region */
1804 rma_size
= ri
->npages
;
1805 if (rma_size
> memslot
->npages
)
1806 rma_size
= memslot
->npages
;
1807 rma_size
<<= PAGE_SHIFT
;
1808 rmls
= lpcr_rmls(rma_size
);
1811 pr_err("KVM: Can't use RMA of 0x%lx bytes\n", rma_size
);
1814 atomic_inc(&ri
->use_count
);
1817 /* Update LPCR and RMOR */
1818 lpcr
= kvm
->arch
.lpcr
;
1819 if (cpu_has_feature(CPU_FTR_ARCH_201
)) {
1820 /* PPC970; insert RMLS value (split field) in HID4 */
1821 lpcr
&= ~((1ul << HID4_RMLS0_SH
) |
1822 (3ul << HID4_RMLS2_SH
));
1823 lpcr
|= ((rmls
>> 2) << HID4_RMLS0_SH
) |
1824 ((rmls
& 3) << HID4_RMLS2_SH
);
1825 /* RMOR is also in HID4 */
1826 lpcr
|= ((ri
->base_pfn
>> (26 - PAGE_SHIFT
)) & 0xffff)
1830 lpcr
&= ~(LPCR_VPM0
| LPCR_VRMA_L
);
1831 lpcr
|= rmls
<< LPCR_RMLS_SH
;
1832 kvm
->arch
.rmor
= kvm
->arch
.rma
->base_pfn
<< PAGE_SHIFT
;
1834 kvm
->arch
.lpcr
= lpcr
;
1835 pr_info("KVM: Using RMO at %lx size %lx (LPCR = %lx)\n",
1836 ri
->base_pfn
<< PAGE_SHIFT
, rma_size
, lpcr
);
1838 /* Initialize phys addrs of pages in RMO */
1839 npages
= ri
->npages
;
1840 porder
= __ilog2(npages
);
1841 physp
= memslot
->arch
.slot_phys
;
1843 if (npages
> memslot
->npages
)
1844 npages
= memslot
->npages
;
1845 spin_lock(&kvm
->arch
.slot_phys_lock
);
1846 for (i
= 0; i
< npages
; ++i
)
1847 physp
[i
] = ((ri
->base_pfn
+ i
) << PAGE_SHIFT
) +
1849 spin_unlock(&kvm
->arch
.slot_phys_lock
);
1853 /* Order updates to kvm->arch.lpcr etc. vs. rma_setup_done */
1855 kvm
->arch
.rma_setup_done
= 1;
1858 srcu_read_unlock(&kvm
->srcu
, srcu_idx
);
1860 mutex_unlock(&kvm
->lock
);
1864 up_read(¤t
->mm
->mmap_sem
);
1868 int kvmppc_core_init_vm(struct kvm
*kvm
)
1870 unsigned long lpcr
, lpid
;
1872 /* Allocate the guest's logical partition ID */
1874 lpid
= kvmppc_alloc_lpid();
1877 kvm
->arch
.lpid
= lpid
;
1880 * Since we don't flush the TLB when tearing down a VM,
1881 * and this lpid might have previously been used,
1882 * make sure we flush on each core before running the new VM.
1884 cpumask_setall(&kvm
->arch
.need_tlb_flush
);
1886 INIT_LIST_HEAD(&kvm
->arch
.spapr_tce_tables
);
1887 INIT_LIST_HEAD(&kvm
->arch
.rtas_tokens
);
1889 kvm
->arch
.rma
= NULL
;
1891 kvm
->arch
.host_sdr1
= mfspr(SPRN_SDR1
);
1893 if (cpu_has_feature(CPU_FTR_ARCH_201
)) {
1894 /* PPC970; HID4 is effectively the LPCR */
1895 kvm
->arch
.host_lpid
= 0;
1896 kvm
->arch
.host_lpcr
= lpcr
= mfspr(SPRN_HID4
);
1897 lpcr
&= ~((3 << HID4_LPID1_SH
) | (0xful
<< HID4_LPID5_SH
));
1898 lpcr
|= ((lpid
>> 4) << HID4_LPID1_SH
) |
1899 ((lpid
& 0xf) << HID4_LPID5_SH
);
1901 /* POWER7; init LPCR for virtual RMA mode */
1902 kvm
->arch
.host_lpid
= mfspr(SPRN_LPID
);
1903 kvm
->arch
.host_lpcr
= lpcr
= mfspr(SPRN_LPCR
);
1904 lpcr
&= LPCR_PECE
| LPCR_LPES
;
1905 lpcr
|= (4UL << LPCR_DPFD_SH
) | LPCR_HDICE
|
1906 LPCR_VPM0
| LPCR_VPM1
;
1907 kvm
->arch
.vrma_slb_v
= SLB_VSID_B_1T
|
1908 (VRMA_VSID
<< SLB_VSID_SHIFT_1T
);
1910 kvm
->arch
.lpcr
= lpcr
;
1912 kvm
->arch
.using_mmu_notifiers
= !!cpu_has_feature(CPU_FTR_ARCH_206
);
1913 spin_lock_init(&kvm
->arch
.slot_phys_lock
);
1916 * Don't allow secondary CPU threads to come online
1917 * while any KVM VMs exist.
1919 inhibit_secondary_onlining();
1924 void kvmppc_core_destroy_vm(struct kvm
*kvm
)
1926 uninhibit_secondary_onlining();
1928 if (kvm
->arch
.rma
) {
1929 kvm_release_rma(kvm
->arch
.rma
);
1930 kvm
->arch
.rma
= NULL
;
1933 kvmppc_rtas_tokens_free(kvm
);
1935 kvmppc_free_hpt(kvm
);
1936 WARN_ON(!list_empty(&kvm
->arch
.spapr_tce_tables
));
1939 /* These are stubs for now */
1940 void kvmppc_mmu_pte_pflush(struct kvm_vcpu
*vcpu
, ulong pa_start
, ulong pa_end
)
1944 /* We don't need to emulate any privileged instructions or dcbz */
1945 int kvmppc_core_emulate_op(struct kvm_run
*run
, struct kvm_vcpu
*vcpu
,
1946 unsigned int inst
, int *advance
)
1948 return EMULATE_FAIL
;
1951 int kvmppc_core_emulate_mtspr(struct kvm_vcpu
*vcpu
, int sprn
, ulong spr_val
)
1953 return EMULATE_FAIL
;
1956 int kvmppc_core_emulate_mfspr(struct kvm_vcpu
*vcpu
, int sprn
, ulong
*spr_val
)
1958 return EMULATE_FAIL
;
1961 static int kvmppc_book3s_hv_init(void)
1965 r
= kvm_init(NULL
, sizeof(struct kvm_vcpu
), 0, THIS_MODULE
);
1970 r
= kvmppc_mmu_hv_init();
1975 static void kvmppc_book3s_hv_exit(void)
1980 module_init(kvmppc_book3s_hv_init
);
1981 module_exit(kvmppc_book3s_hv_exit
);