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