1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright IBM Corporation, 2018
4 * Authors Suraj Jitindar Singh <sjitindarsingh@gmail.com>
5 * Paul Mackerras <paulus@ozlabs.org>
7 * Description: KVM functions specific to running nested KVM-HV guests
8 * on Book3S processors (specifically POWER9 and later).
11 #include <linux/kernel.h>
12 #include <linux/kvm_host.h>
13 #include <linux/llist.h>
14 #include <linux/pgtable.h>
16 #include <asm/kvm_ppc.h>
17 #include <asm/kvm_book3s.h>
19 #include <asm/pgalloc.h>
20 #include <asm/pte-walk.h>
22 #include <asm/plpar_wrappers.h>
24 static struct patb_entry
*pseries_partition_tb
;
26 static void kvmhv_update_ptbl_cache(struct kvm_nested_guest
*gp
);
27 static void kvmhv_free_memslot_nest_rmap(struct kvm_memory_slot
*free
);
29 void kvmhv_save_hv_regs(struct kvm_vcpu
*vcpu
, struct hv_guest_state
*hr
)
31 struct kvmppc_vcore
*vc
= vcpu
->arch
.vcore
;
33 hr
->pcr
= vc
->pcr
| PCR_MASK
;
34 hr
->dpdes
= vc
->dpdes
;
35 hr
->hfscr
= vcpu
->arch
.hfscr
;
36 hr
->tb_offset
= vc
->tb_offset
;
37 hr
->dawr0
= vcpu
->arch
.dawr0
;
38 hr
->dawrx0
= vcpu
->arch
.dawrx0
;
39 hr
->ciabr
= vcpu
->arch
.ciabr
;
40 hr
->purr
= vcpu
->arch
.purr
;
41 hr
->spurr
= vcpu
->arch
.spurr
;
42 hr
->ic
= vcpu
->arch
.ic
;
44 hr
->srr0
= vcpu
->arch
.shregs
.srr0
;
45 hr
->srr1
= vcpu
->arch
.shregs
.srr1
;
46 hr
->sprg
[0] = vcpu
->arch
.shregs
.sprg0
;
47 hr
->sprg
[1] = vcpu
->arch
.shregs
.sprg1
;
48 hr
->sprg
[2] = vcpu
->arch
.shregs
.sprg2
;
49 hr
->sprg
[3] = vcpu
->arch
.shregs
.sprg3
;
50 hr
->pidr
= vcpu
->arch
.pid
;
51 hr
->cfar
= vcpu
->arch
.cfar
;
52 hr
->ppr
= vcpu
->arch
.ppr
;
53 hr
->dawr1
= vcpu
->arch
.dawr1
;
54 hr
->dawrx1
= vcpu
->arch
.dawrx1
;
57 /* Use noinline_for_stack due to https://bugs.llvm.org/show_bug.cgi?id=49610 */
58 static noinline_for_stack
void byteswap_pt_regs(struct pt_regs
*regs
)
60 unsigned long *addr
= (unsigned long *) regs
;
62 for (; addr
< ((unsigned long *) (regs
+ 1)); addr
++)
63 *addr
= swab64(*addr
);
66 static void byteswap_hv_regs(struct hv_guest_state
*hr
)
68 hr
->version
= swab64(hr
->version
);
69 hr
->lpid
= swab32(hr
->lpid
);
70 hr
->vcpu_token
= swab32(hr
->vcpu_token
);
71 hr
->lpcr
= swab64(hr
->lpcr
);
72 hr
->pcr
= swab64(hr
->pcr
) | PCR_MASK
;
73 hr
->amor
= swab64(hr
->amor
);
74 hr
->dpdes
= swab64(hr
->dpdes
);
75 hr
->hfscr
= swab64(hr
->hfscr
);
76 hr
->tb_offset
= swab64(hr
->tb_offset
);
77 hr
->dawr0
= swab64(hr
->dawr0
);
78 hr
->dawrx0
= swab64(hr
->dawrx0
);
79 hr
->ciabr
= swab64(hr
->ciabr
);
80 hr
->hdec_expiry
= swab64(hr
->hdec_expiry
);
81 hr
->purr
= swab64(hr
->purr
);
82 hr
->spurr
= swab64(hr
->spurr
);
83 hr
->ic
= swab64(hr
->ic
);
84 hr
->vtb
= swab64(hr
->vtb
);
85 hr
->hdar
= swab64(hr
->hdar
);
86 hr
->hdsisr
= swab64(hr
->hdsisr
);
87 hr
->heir
= swab64(hr
->heir
);
88 hr
->asdr
= swab64(hr
->asdr
);
89 hr
->srr0
= swab64(hr
->srr0
);
90 hr
->srr1
= swab64(hr
->srr1
);
91 hr
->sprg
[0] = swab64(hr
->sprg
[0]);
92 hr
->sprg
[1] = swab64(hr
->sprg
[1]);
93 hr
->sprg
[2] = swab64(hr
->sprg
[2]);
94 hr
->sprg
[3] = swab64(hr
->sprg
[3]);
95 hr
->pidr
= swab64(hr
->pidr
);
96 hr
->cfar
= swab64(hr
->cfar
);
97 hr
->ppr
= swab64(hr
->ppr
);
98 hr
->dawr1
= swab64(hr
->dawr1
);
99 hr
->dawrx1
= swab64(hr
->dawrx1
);
102 static void save_hv_return_state(struct kvm_vcpu
*vcpu
, int trap
,
103 struct hv_guest_state
*hr
)
105 struct kvmppc_vcore
*vc
= vcpu
->arch
.vcore
;
107 hr
->dpdes
= vc
->dpdes
;
108 hr
->hfscr
= vcpu
->arch
.hfscr
;
109 hr
->purr
= vcpu
->arch
.purr
;
110 hr
->spurr
= vcpu
->arch
.spurr
;
111 hr
->ic
= vcpu
->arch
.ic
;
113 hr
->srr0
= vcpu
->arch
.shregs
.srr0
;
114 hr
->srr1
= vcpu
->arch
.shregs
.srr1
;
115 hr
->sprg
[0] = vcpu
->arch
.shregs
.sprg0
;
116 hr
->sprg
[1] = vcpu
->arch
.shregs
.sprg1
;
117 hr
->sprg
[2] = vcpu
->arch
.shregs
.sprg2
;
118 hr
->sprg
[3] = vcpu
->arch
.shregs
.sprg3
;
119 hr
->pidr
= vcpu
->arch
.pid
;
120 hr
->cfar
= vcpu
->arch
.cfar
;
121 hr
->ppr
= vcpu
->arch
.ppr
;
123 case BOOK3S_INTERRUPT_H_DATA_STORAGE
:
124 hr
->hdar
= vcpu
->arch
.fault_dar
;
125 hr
->hdsisr
= vcpu
->arch
.fault_dsisr
;
126 hr
->asdr
= vcpu
->arch
.fault_gpa
;
128 case BOOK3S_INTERRUPT_H_INST_STORAGE
:
129 hr
->asdr
= vcpu
->arch
.fault_gpa
;
131 case BOOK3S_INTERRUPT_H_EMUL_ASSIST
:
132 hr
->heir
= vcpu
->arch
.emul_inst
;
138 * This can result in some L0 HV register state being leaked to an L1
139 * hypervisor when the hv_guest_state is copied back to the guest after
140 * being modified here.
142 * There is no known problem with such a leak, and in many cases these
143 * register settings could be derived by the guest by observing behaviour
144 * and timing, interrupts, etc., but it is an issue to consider.
146 static void sanitise_hv_regs(struct kvm_vcpu
*vcpu
, struct hv_guest_state
*hr
)
148 struct kvmppc_vcore
*vc
= vcpu
->arch
.vcore
;
152 * Don't let L1 change LPCR bits for the L2 except these:
154 mask
= LPCR_DPFD
| LPCR_ILE
| LPCR_TC
| LPCR_AIL
| LPCR_LD
|
155 LPCR_LPES
| LPCR_MER
;
158 * Additional filtering is required depending on hardware
161 hr
->lpcr
= kvmppc_filter_lpcr_hv(vcpu
->kvm
,
162 (vc
->lpcr
& ~mask
) | (hr
->lpcr
& mask
));
165 * Don't let L1 enable features for L2 which we've disabled for L1,
166 * but preserve the interrupt cause field.
168 hr
->hfscr
&= (HFSCR_INTR_CAUSE
| vcpu
->arch
.hfscr
);
170 /* Don't let data address watchpoint match in hypervisor state */
171 hr
->dawrx0
&= ~DAWRX_HYP
;
172 hr
->dawrx1
&= ~DAWRX_HYP
;
174 /* Don't let completed instruction address breakpt match in HV state */
175 if ((hr
->ciabr
& CIABR_PRIV
) == CIABR_PRIV_HYPER
)
176 hr
->ciabr
&= ~CIABR_PRIV
;
179 static void restore_hv_regs(struct kvm_vcpu
*vcpu
, struct hv_guest_state
*hr
)
181 struct kvmppc_vcore
*vc
= vcpu
->arch
.vcore
;
183 vc
->pcr
= hr
->pcr
| PCR_MASK
;
184 vc
->dpdes
= hr
->dpdes
;
185 vcpu
->arch
.hfscr
= hr
->hfscr
;
186 vcpu
->arch
.dawr0
= hr
->dawr0
;
187 vcpu
->arch
.dawrx0
= hr
->dawrx0
;
188 vcpu
->arch
.ciabr
= hr
->ciabr
;
189 vcpu
->arch
.purr
= hr
->purr
;
190 vcpu
->arch
.spurr
= hr
->spurr
;
191 vcpu
->arch
.ic
= hr
->ic
;
193 vcpu
->arch
.shregs
.srr0
= hr
->srr0
;
194 vcpu
->arch
.shregs
.srr1
= hr
->srr1
;
195 vcpu
->arch
.shregs
.sprg0
= hr
->sprg
[0];
196 vcpu
->arch
.shregs
.sprg1
= hr
->sprg
[1];
197 vcpu
->arch
.shregs
.sprg2
= hr
->sprg
[2];
198 vcpu
->arch
.shregs
.sprg3
= hr
->sprg
[3];
199 vcpu
->arch
.pid
= hr
->pidr
;
200 vcpu
->arch
.cfar
= hr
->cfar
;
201 vcpu
->arch
.ppr
= hr
->ppr
;
202 vcpu
->arch
.dawr1
= hr
->dawr1
;
203 vcpu
->arch
.dawrx1
= hr
->dawrx1
;
206 void kvmhv_restore_hv_return_state(struct kvm_vcpu
*vcpu
,
207 struct hv_guest_state
*hr
)
209 struct kvmppc_vcore
*vc
= vcpu
->arch
.vcore
;
211 vc
->dpdes
= hr
->dpdes
;
212 vcpu
->arch
.hfscr
= hr
->hfscr
;
213 vcpu
->arch
.purr
= hr
->purr
;
214 vcpu
->arch
.spurr
= hr
->spurr
;
215 vcpu
->arch
.ic
= hr
->ic
;
217 vcpu
->arch
.fault_dar
= hr
->hdar
;
218 vcpu
->arch
.fault_dsisr
= hr
->hdsisr
;
219 vcpu
->arch
.fault_gpa
= hr
->asdr
;
220 vcpu
->arch
.emul_inst
= hr
->heir
;
221 vcpu
->arch
.shregs
.srr0
= hr
->srr0
;
222 vcpu
->arch
.shregs
.srr1
= hr
->srr1
;
223 vcpu
->arch
.shregs
.sprg0
= hr
->sprg
[0];
224 vcpu
->arch
.shregs
.sprg1
= hr
->sprg
[1];
225 vcpu
->arch
.shregs
.sprg2
= hr
->sprg
[2];
226 vcpu
->arch
.shregs
.sprg3
= hr
->sprg
[3];
227 vcpu
->arch
.pid
= hr
->pidr
;
228 vcpu
->arch
.cfar
= hr
->cfar
;
229 vcpu
->arch
.ppr
= hr
->ppr
;
232 static void kvmhv_nested_mmio_needed(struct kvm_vcpu
*vcpu
, u64 regs_ptr
)
234 /* No need to reflect the page fault to L1, we've handled it */
238 * Since the L2 gprs have already been written back into L1 memory when
239 * we complete the mmio, store the L1 memory location of the L2 gpr
240 * being loaded into by the mmio so that the loaded value can be
241 * written there in kvmppc_complete_mmio_load()
243 if (((vcpu
->arch
.io_gpr
& KVM_MMIO_REG_EXT_MASK
) == KVM_MMIO_REG_GPR
)
244 && (vcpu
->mmio_is_write
== 0)) {
245 vcpu
->arch
.nested_io_gpr
= (gpa_t
) regs_ptr
+
246 offsetof(struct pt_regs
,
247 gpr
[vcpu
->arch
.io_gpr
]);
248 vcpu
->arch
.io_gpr
= KVM_MMIO_REG_NESTED_GPR
;
252 static int kvmhv_read_guest_state_and_regs(struct kvm_vcpu
*vcpu
,
253 struct hv_guest_state
*l2_hv
,
254 struct pt_regs
*l2_regs
,
255 u64 hv_ptr
, u64 regs_ptr
)
259 if (kvm_vcpu_read_guest(vcpu
, hv_ptr
, &l2_hv
->version
,
260 sizeof(l2_hv
->version
)))
263 if (kvmppc_need_byteswap(vcpu
))
264 l2_hv
->version
= swab64(l2_hv
->version
);
266 size
= hv_guest_state_size(l2_hv
->version
);
270 return kvm_vcpu_read_guest(vcpu
, hv_ptr
, l2_hv
, size
) ||
271 kvm_vcpu_read_guest(vcpu
, regs_ptr
, l2_regs
,
272 sizeof(struct pt_regs
));
275 static int kvmhv_write_guest_state_and_regs(struct kvm_vcpu
*vcpu
,
276 struct hv_guest_state
*l2_hv
,
277 struct pt_regs
*l2_regs
,
278 u64 hv_ptr
, u64 regs_ptr
)
282 size
= hv_guest_state_size(l2_hv
->version
);
286 return kvm_vcpu_write_guest(vcpu
, hv_ptr
, l2_hv
, size
) ||
287 kvm_vcpu_write_guest(vcpu
, regs_ptr
, l2_regs
,
288 sizeof(struct pt_regs
));
291 long kvmhv_enter_nested_guest(struct kvm_vcpu
*vcpu
)
294 struct kvm_nested_guest
*l2
;
295 struct pt_regs l2_regs
, saved_l1_regs
;
296 struct hv_guest_state l2_hv
= {0}, saved_l1_hv
;
297 struct kvmppc_vcore
*vc
= vcpu
->arch
.vcore
;
298 u64 hv_ptr
, regs_ptr
;
300 s64 delta_purr
, delta_spurr
, delta_ic
, delta_vtb
;
302 if (vcpu
->kvm
->arch
.l1_ptcr
== 0)
303 return H_NOT_AVAILABLE
;
305 if (MSR_TM_TRANSACTIONAL(vcpu
->arch
.shregs
.msr
))
308 /* copy parameters in */
309 hv_ptr
= kvmppc_get_gpr(vcpu
, 4);
310 regs_ptr
= kvmppc_get_gpr(vcpu
, 5);
311 vcpu
->srcu_idx
= srcu_read_lock(&vcpu
->kvm
->srcu
);
312 err
= kvmhv_read_guest_state_and_regs(vcpu
, &l2_hv
, &l2_regs
,
314 srcu_read_unlock(&vcpu
->kvm
->srcu
, vcpu
->srcu_idx
);
318 if (kvmppc_need_byteswap(vcpu
))
319 byteswap_hv_regs(&l2_hv
);
320 if (l2_hv
.version
> HV_GUEST_STATE_VERSION
)
323 if (kvmppc_need_byteswap(vcpu
))
324 byteswap_pt_regs(&l2_regs
);
325 if (l2_hv
.vcpu_token
>= NR_CPUS
)
329 * L1 must have set up a suspended state to enter the L2 in a
330 * transactional state, and only in that case. These have to be
331 * filtered out here to prevent causing a TM Bad Thing in the
332 * host HRFID. We could synthesize a TM Bad Thing back to the L1
333 * here but there doesn't seem like much point.
335 if (MSR_TM_SUSPENDED(vcpu
->arch
.shregs
.msr
)) {
336 if (!MSR_TM_ACTIVE(l2_regs
.msr
))
339 if (l2_regs
.msr
& MSR_TS_MASK
)
341 if (WARN_ON_ONCE(vcpu
->arch
.shregs
.msr
& MSR_TS_MASK
))
346 l2
= kvmhv_get_nested(vcpu
->kvm
, l2_hv
.lpid
, true);
349 if (!l2
->l1_gr_to_hr
) {
350 mutex_lock(&l2
->tlb_lock
);
351 kvmhv_update_ptbl_cache(l2
);
352 mutex_unlock(&l2
->tlb_lock
);
355 /* save l1 values of things */
356 vcpu
->arch
.regs
.msr
= vcpu
->arch
.shregs
.msr
;
357 saved_l1_regs
= vcpu
->arch
.regs
;
358 kvmhv_save_hv_regs(vcpu
, &saved_l1_hv
);
360 /* convert TB values/offsets to host (L0) values */
361 hdec_exp
= l2_hv
.hdec_expiry
- vc
->tb_offset
;
362 vc
->tb_offset
+= l2_hv
.tb_offset
;
364 /* set L1 state to L2 state */
365 vcpu
->arch
.nested
= l2
;
366 vcpu
->arch
.nested_vcpu_id
= l2_hv
.vcpu_token
;
367 vcpu
->arch
.regs
= l2_regs
;
369 /* Guest must always run with ME enabled, HV disabled. */
370 vcpu
->arch
.shregs
.msr
= (vcpu
->arch
.regs
.msr
| MSR_ME
) & ~MSR_HV
;
372 sanitise_hv_regs(vcpu
, &l2_hv
);
373 restore_hv_regs(vcpu
, &l2_hv
);
375 vcpu
->arch
.ret
= RESUME_GUEST
;
378 if (mftb() >= hdec_exp
) {
379 vcpu
->arch
.trap
= BOOK3S_INTERRUPT_HV_DECREMENTER
;
383 r
= kvmhv_run_single_vcpu(vcpu
, hdec_exp
, l2_hv
.lpcr
);
384 } while (is_kvmppc_resume_guest(r
));
386 /* save L2 state for return */
387 l2_regs
= vcpu
->arch
.regs
;
388 l2_regs
.msr
= vcpu
->arch
.shregs
.msr
;
389 delta_purr
= vcpu
->arch
.purr
- l2_hv
.purr
;
390 delta_spurr
= vcpu
->arch
.spurr
- l2_hv
.spurr
;
391 delta_ic
= vcpu
->arch
.ic
- l2_hv
.ic
;
392 delta_vtb
= vc
->vtb
- l2_hv
.vtb
;
393 save_hv_return_state(vcpu
, vcpu
->arch
.trap
, &l2_hv
);
395 /* restore L1 state */
396 vcpu
->arch
.nested
= NULL
;
397 vcpu
->arch
.regs
= saved_l1_regs
;
398 vcpu
->arch
.shregs
.msr
= saved_l1_regs
.msr
& ~MSR_TS_MASK
;
399 /* set L1 MSR TS field according to L2 transaction state */
400 if (l2_regs
.msr
& MSR_TS_MASK
)
401 vcpu
->arch
.shregs
.msr
|= MSR_TS_S
;
402 vc
->tb_offset
= saved_l1_hv
.tb_offset
;
403 restore_hv_regs(vcpu
, &saved_l1_hv
);
404 vcpu
->arch
.purr
+= delta_purr
;
405 vcpu
->arch
.spurr
+= delta_spurr
;
406 vcpu
->arch
.ic
+= delta_ic
;
407 vc
->vtb
+= delta_vtb
;
409 kvmhv_put_nested(l2
);
411 /* copy l2_hv_state and regs back to guest */
412 if (kvmppc_need_byteswap(vcpu
)) {
413 byteswap_hv_regs(&l2_hv
);
414 byteswap_pt_regs(&l2_regs
);
416 vcpu
->srcu_idx
= srcu_read_lock(&vcpu
->kvm
->srcu
);
417 err
= kvmhv_write_guest_state_and_regs(vcpu
, &l2_hv
, &l2_regs
,
419 srcu_read_unlock(&vcpu
->kvm
->srcu
, vcpu
->srcu_idx
);
426 if (vcpu
->mmio_needed
) {
427 kvmhv_nested_mmio_needed(vcpu
, regs_ptr
);
431 return vcpu
->arch
.trap
;
434 long kvmhv_nested_init(void)
440 if (!kvmhv_on_pseries())
442 if (!radix_enabled())
445 /* find log base 2 of KVMPPC_NR_LPIDS, rounding up */
446 ptb_order
= __ilog2(KVMPPC_NR_LPIDS
- 1) + 1;
449 pseries_partition_tb
= kmalloc(sizeof(struct patb_entry
) << ptb_order
,
451 if (!pseries_partition_tb
) {
452 pr_err("kvm-hv: failed to allocated nested partition table\n");
456 ptcr
= __pa(pseries_partition_tb
) | (ptb_order
- 8);
457 rc
= plpar_hcall_norets(H_SET_PARTITION_TABLE
, ptcr
);
458 if (rc
!= H_SUCCESS
) {
459 pr_err("kvm-hv: Parent hypervisor does not support nesting (rc=%ld)\n",
461 kfree(pseries_partition_tb
);
462 pseries_partition_tb
= NULL
;
469 void kvmhv_nested_exit(void)
472 * N.B. the kvmhv_on_pseries() test is there because it enables
473 * the compiler to remove the call to plpar_hcall_norets()
474 * when CONFIG_PPC_PSERIES=n.
476 if (kvmhv_on_pseries() && pseries_partition_tb
) {
477 plpar_hcall_norets(H_SET_PARTITION_TABLE
, 0);
478 kfree(pseries_partition_tb
);
479 pseries_partition_tb
= NULL
;
483 static void kvmhv_flush_lpid(unsigned int lpid
)
487 if (!kvmhv_on_pseries()) {
488 radix__flush_all_lpid(lpid
);
492 if (!firmware_has_feature(FW_FEATURE_RPT_INVALIDATE
))
493 rc
= plpar_hcall_norets(H_TLB_INVALIDATE
, H_TLBIE_P1_ENC(2, 0, 1),
494 lpid
, TLBIEL_INVAL_SET_LPID
);
496 rc
= pseries_rpt_invalidate(lpid
, H_RPTI_TARGET_CMMU
,
498 H_RPTI_TYPE_TLB
| H_RPTI_TYPE_PWC
|
500 H_RPTI_PAGE_ALL
, 0, -1UL);
502 pr_err("KVM: TLB LPID invalidation hcall failed, rc=%ld\n", rc
);
505 void kvmhv_set_ptbl_entry(unsigned int lpid
, u64 dw0
, u64 dw1
)
507 if (!kvmhv_on_pseries()) {
508 mmu_partition_table_set_entry(lpid
, dw0
, dw1
, true);
512 pseries_partition_tb
[lpid
].patb0
= cpu_to_be64(dw0
);
513 pseries_partition_tb
[lpid
].patb1
= cpu_to_be64(dw1
);
514 /* L0 will do the necessary barriers */
515 kvmhv_flush_lpid(lpid
);
518 static void kvmhv_set_nested_ptbl(struct kvm_nested_guest
*gp
)
522 dw0
= PATB_HR
| radix__get_tree_size() |
523 __pa(gp
->shadow_pgtable
) | RADIX_PGD_INDEX_SIZE
;
524 kvmhv_set_ptbl_entry(gp
->shadow_lpid
, dw0
, gp
->process_table
);
527 void kvmhv_vm_nested_init(struct kvm
*kvm
)
529 kvm
->arch
.max_nested_lpid
= -1;
533 * Handle the H_SET_PARTITION_TABLE hcall.
534 * r4 = guest real address of partition table + log_2(size) - 12
535 * (formatted as for the PTCR).
537 long kvmhv_set_partition_table(struct kvm_vcpu
*vcpu
)
539 struct kvm
*kvm
= vcpu
->kvm
;
540 unsigned long ptcr
= kvmppc_get_gpr(vcpu
, 4);
542 long ret
= H_SUCCESS
;
544 srcu_idx
= srcu_read_lock(&kvm
->srcu
);
546 * Limit the partition table to 4096 entries (because that's what
547 * hardware supports), and check the base address.
549 if ((ptcr
& PRTS_MASK
) > 12 - 8 ||
550 !kvm_is_visible_gfn(vcpu
->kvm
, (ptcr
& PRTB_MASK
) >> PAGE_SHIFT
))
552 srcu_read_unlock(&kvm
->srcu
, srcu_idx
);
553 if (ret
== H_SUCCESS
)
554 kvm
->arch
.l1_ptcr
= ptcr
;
559 * Handle the H_COPY_TOFROM_GUEST hcall.
560 * r4 = L1 lpid of nested guest
562 * r6 = eaddr to access
563 * r7 = to buffer (L1 gpa)
564 * r8 = from buffer (L1 gpa)
565 * r9 = n bytes to copy
567 long kvmhv_copy_tofrom_guest_nested(struct kvm_vcpu
*vcpu
)
569 struct kvm_nested_guest
*gp
;
570 int l1_lpid
= kvmppc_get_gpr(vcpu
, 4);
571 int pid
= kvmppc_get_gpr(vcpu
, 5);
572 gva_t eaddr
= kvmppc_get_gpr(vcpu
, 6);
573 gpa_t gp_to
= (gpa_t
) kvmppc_get_gpr(vcpu
, 7);
574 gpa_t gp_from
= (gpa_t
) kvmppc_get_gpr(vcpu
, 8);
576 unsigned long n
= kvmppc_get_gpr(vcpu
, 9);
577 bool is_load
= !!gp_to
;
580 if (gp_to
&& gp_from
) /* One must be NULL to determine the direction */
583 if (eaddr
& (0xFFFUL
<< 52))
586 buf
= kzalloc(n
, GFP_KERNEL
);
590 gp
= kvmhv_get_nested(vcpu
->kvm
, l1_lpid
, false);
596 mutex_lock(&gp
->tlb_lock
);
599 /* Load from the nested guest into our buffer */
600 rc
= __kvmhv_copy_tofrom_guest_radix(gp
->shadow_lpid
, pid
,
601 eaddr
, buf
, NULL
, n
);
605 /* Write what was loaded into our buffer back to the L1 guest */
606 vcpu
->srcu_idx
= srcu_read_lock(&vcpu
->kvm
->srcu
);
607 rc
= kvm_vcpu_write_guest(vcpu
, gp_to
, buf
, n
);
608 srcu_read_unlock(&vcpu
->kvm
->srcu
, vcpu
->srcu_idx
);
612 /* Load the data to be stored from the L1 guest into our buf */
613 vcpu
->srcu_idx
= srcu_read_lock(&vcpu
->kvm
->srcu
);
614 rc
= kvm_vcpu_read_guest(vcpu
, gp_from
, buf
, n
);
615 srcu_read_unlock(&vcpu
->kvm
->srcu
, vcpu
->srcu_idx
);
619 /* Store from our buffer into the nested guest */
620 rc
= __kvmhv_copy_tofrom_guest_radix(gp
->shadow_lpid
, pid
,
621 eaddr
, NULL
, buf
, n
);
627 mutex_unlock(&gp
->tlb_lock
);
628 kvmhv_put_nested(gp
);
638 * Reload the partition table entry for a guest.
639 * Caller must hold gp->tlb_lock.
641 static void kvmhv_update_ptbl_cache(struct kvm_nested_guest
*gp
)
644 struct patb_entry ptbl_entry
;
645 unsigned long ptbl_addr
;
646 struct kvm
*kvm
= gp
->l1_host
;
649 ptbl_addr
= (kvm
->arch
.l1_ptcr
& PRTB_MASK
) + (gp
->l1_lpid
<< 4);
650 if (gp
->l1_lpid
< (1ul << ((kvm
->arch
.l1_ptcr
& PRTS_MASK
) + 8))) {
651 int srcu_idx
= srcu_read_lock(&kvm
->srcu
);
652 ret
= kvm_read_guest(kvm
, ptbl_addr
,
653 &ptbl_entry
, sizeof(ptbl_entry
));
654 srcu_read_unlock(&kvm
->srcu
, srcu_idx
);
658 gp
->process_table
= 0;
660 gp
->l1_gr_to_hr
= be64_to_cpu(ptbl_entry
.patb0
);
661 gp
->process_table
= be64_to_cpu(ptbl_entry
.patb1
);
663 kvmhv_set_nested_ptbl(gp
);
666 static struct kvm_nested_guest
*kvmhv_alloc_nested(struct kvm
*kvm
, unsigned int lpid
)
668 struct kvm_nested_guest
*gp
;
671 gp
= kzalloc(sizeof(*gp
), GFP_KERNEL
);
676 mutex_init(&gp
->tlb_lock
);
677 gp
->shadow_pgtable
= pgd_alloc(kvm
->mm
);
678 if (!gp
->shadow_pgtable
)
680 shadow_lpid
= kvmppc_alloc_lpid();
683 gp
->shadow_lpid
= shadow_lpid
;
686 memset(gp
->prev_cpu
, -1, sizeof(gp
->prev_cpu
));
691 pgd_free(kvm
->mm
, gp
->shadow_pgtable
);
698 * Free up any resources allocated for a nested guest.
700 static void kvmhv_release_nested(struct kvm_nested_guest
*gp
)
702 struct kvm
*kvm
= gp
->l1_host
;
704 if (gp
->shadow_pgtable
) {
706 * No vcpu is using this struct and no call to
707 * kvmhv_get_nested can find this struct,
708 * so we don't need to hold kvm->mmu_lock.
710 kvmppc_free_pgtable_radix(kvm
, gp
->shadow_pgtable
,
712 pgd_free(kvm
->mm
, gp
->shadow_pgtable
);
714 kvmhv_set_ptbl_entry(gp
->shadow_lpid
, 0, 0);
715 kvmppc_free_lpid(gp
->shadow_lpid
);
719 static void kvmhv_remove_nested(struct kvm_nested_guest
*gp
)
721 struct kvm
*kvm
= gp
->l1_host
;
722 int lpid
= gp
->l1_lpid
;
725 spin_lock(&kvm
->mmu_lock
);
726 if (gp
== kvm
->arch
.nested_guests
[lpid
]) {
727 kvm
->arch
.nested_guests
[lpid
] = NULL
;
728 if (lpid
== kvm
->arch
.max_nested_lpid
) {
729 while (--lpid
>= 0 && !kvm
->arch
.nested_guests
[lpid
])
731 kvm
->arch
.max_nested_lpid
= lpid
;
736 spin_unlock(&kvm
->mmu_lock
);
738 kvmhv_release_nested(gp
);
742 * Free up all nested resources allocated for this guest.
743 * This is called with no vcpus of the guest running, when
744 * switching the guest to HPT mode or when destroying the
747 void kvmhv_release_all_nested(struct kvm
*kvm
)
750 struct kvm_nested_guest
*gp
;
751 struct kvm_nested_guest
*freelist
= NULL
;
752 struct kvm_memory_slot
*memslot
;
755 spin_lock(&kvm
->mmu_lock
);
756 for (i
= 0; i
<= kvm
->arch
.max_nested_lpid
; i
++) {
757 gp
= kvm
->arch
.nested_guests
[i
];
760 kvm
->arch
.nested_guests
[i
] = NULL
;
761 if (--gp
->refcnt
== 0) {
766 kvm
->arch
.max_nested_lpid
= -1;
767 spin_unlock(&kvm
->mmu_lock
);
768 while ((gp
= freelist
) != NULL
) {
770 kvmhv_release_nested(gp
);
773 srcu_idx
= srcu_read_lock(&kvm
->srcu
);
774 kvm_for_each_memslot(memslot
, kvm_memslots(kvm
))
775 kvmhv_free_memslot_nest_rmap(memslot
);
776 srcu_read_unlock(&kvm
->srcu
, srcu_idx
);
779 /* caller must hold gp->tlb_lock */
780 static void kvmhv_flush_nested(struct kvm_nested_guest
*gp
)
782 struct kvm
*kvm
= gp
->l1_host
;
784 spin_lock(&kvm
->mmu_lock
);
785 kvmppc_free_pgtable_radix(kvm
, gp
->shadow_pgtable
, gp
->shadow_lpid
);
786 spin_unlock(&kvm
->mmu_lock
);
787 kvmhv_flush_lpid(gp
->shadow_lpid
);
788 kvmhv_update_ptbl_cache(gp
);
789 if (gp
->l1_gr_to_hr
== 0)
790 kvmhv_remove_nested(gp
);
793 struct kvm_nested_guest
*kvmhv_get_nested(struct kvm
*kvm
, int l1_lpid
,
796 struct kvm_nested_guest
*gp
, *newgp
;
798 if (l1_lpid
>= KVM_MAX_NESTED_GUESTS
||
799 l1_lpid
>= (1ul << ((kvm
->arch
.l1_ptcr
& PRTS_MASK
) + 12 - 4)))
802 spin_lock(&kvm
->mmu_lock
);
803 gp
= kvm
->arch
.nested_guests
[l1_lpid
];
806 spin_unlock(&kvm
->mmu_lock
);
811 newgp
= kvmhv_alloc_nested(kvm
, l1_lpid
);
814 spin_lock(&kvm
->mmu_lock
);
815 if (kvm
->arch
.nested_guests
[l1_lpid
]) {
816 /* someone else beat us to it */
817 gp
= kvm
->arch
.nested_guests
[l1_lpid
];
819 kvm
->arch
.nested_guests
[l1_lpid
] = newgp
;
823 if (l1_lpid
> kvm
->arch
.max_nested_lpid
)
824 kvm
->arch
.max_nested_lpid
= l1_lpid
;
827 spin_unlock(&kvm
->mmu_lock
);
830 kvmhv_release_nested(newgp
);
835 void kvmhv_put_nested(struct kvm_nested_guest
*gp
)
837 struct kvm
*kvm
= gp
->l1_host
;
840 spin_lock(&kvm
->mmu_lock
);
842 spin_unlock(&kvm
->mmu_lock
);
844 kvmhv_release_nested(gp
);
847 static struct kvm_nested_guest
*kvmhv_find_nested(struct kvm
*kvm
, int lpid
)
849 if (lpid
> kvm
->arch
.max_nested_lpid
)
851 return kvm
->arch
.nested_guests
[lpid
];
854 pte_t
*find_kvm_nested_guest_pte(struct kvm
*kvm
, unsigned long lpid
,
855 unsigned long ea
, unsigned *hshift
)
857 struct kvm_nested_guest
*gp
;
860 gp
= kvmhv_find_nested(kvm
, lpid
);
864 VM_WARN(!spin_is_locked(&kvm
->mmu_lock
),
865 "%s called with kvm mmu_lock not held \n", __func__
);
866 pte
= __find_linux_pte(gp
->shadow_pgtable
, ea
, NULL
, hshift
);
871 static inline bool kvmhv_n_rmap_is_equal(u64 rmap_1
, u64 rmap_2
)
873 return !((rmap_1
^ rmap_2
) & (RMAP_NESTED_LPID_MASK
|
874 RMAP_NESTED_GPA_MASK
));
877 void kvmhv_insert_nest_rmap(struct kvm
*kvm
, unsigned long *rmapp
,
878 struct rmap_nested
**n_rmap
)
880 struct llist_node
*entry
= ((struct llist_head
*) rmapp
)->first
;
881 struct rmap_nested
*cursor
;
882 u64 rmap
, new_rmap
= (*n_rmap
)->rmap
;
884 /* Are there any existing entries? */
886 /* No -> use the rmap as a single entry */
887 *rmapp
= new_rmap
| RMAP_NESTED_IS_SINGLE_ENTRY
;
891 /* Do any entries match what we're trying to insert? */
892 for_each_nest_rmap_safe(cursor
, entry
, &rmap
) {
893 if (kvmhv_n_rmap_is_equal(rmap
, new_rmap
))
897 /* Do we need to create a list or just add the new entry? */
899 if (rmap
& RMAP_NESTED_IS_SINGLE_ENTRY
) /* Not previously a list */
901 llist_add(&((*n_rmap
)->list
), (struct llist_head
*) rmapp
);
902 if (rmap
& RMAP_NESTED_IS_SINGLE_ENTRY
) /* Not previously a list */
903 (*n_rmap
)->list
.next
= (struct llist_node
*) rmap
;
905 /* Set NULL so not freed by caller */
909 static void kvmhv_update_nest_rmap_rc(struct kvm
*kvm
, u64 n_rmap
,
910 unsigned long clr
, unsigned long set
,
911 unsigned long hpa
, unsigned long mask
)
914 unsigned int shift
, lpid
;
917 gpa
= n_rmap
& RMAP_NESTED_GPA_MASK
;
918 lpid
= (n_rmap
& RMAP_NESTED_LPID_MASK
) >> RMAP_NESTED_LPID_SHIFT
;
921 ptep
= find_kvm_nested_guest_pte(kvm
, lpid
, gpa
, &shift
);
923 * If the pte is present and the pfn is still the same, update the pte.
924 * If the pfn has changed then this is a stale rmap entry, the nested
925 * gpa actually points somewhere else now, and there is nothing to do.
926 * XXX A future optimisation would be to remove the rmap entry here.
928 if (ptep
&& pte_present(*ptep
) && ((pte_val(*ptep
) & mask
) == hpa
)) {
929 __radix_pte_update(ptep
, clr
, set
);
930 kvmppc_radix_tlbie_page(kvm
, gpa
, shift
, lpid
);
935 * For a given list of rmap entries, update the rc bits in all ptes in shadow
936 * page tables for nested guests which are referenced by the rmap list.
938 void kvmhv_update_nest_rmap_rc_list(struct kvm
*kvm
, unsigned long *rmapp
,
939 unsigned long clr
, unsigned long set
,
940 unsigned long hpa
, unsigned long nbytes
)
942 struct llist_node
*entry
= ((struct llist_head
*) rmapp
)->first
;
943 struct rmap_nested
*cursor
;
944 unsigned long rmap
, mask
;
946 if ((clr
| set
) & ~(_PAGE_DIRTY
| _PAGE_ACCESSED
))
949 mask
= PTE_RPN_MASK
& ~(nbytes
- 1);
952 for_each_nest_rmap_safe(cursor
, entry
, &rmap
)
953 kvmhv_update_nest_rmap_rc(kvm
, rmap
, clr
, set
, hpa
, mask
);
956 static void kvmhv_remove_nest_rmap(struct kvm
*kvm
, u64 n_rmap
,
957 unsigned long hpa
, unsigned long mask
)
959 struct kvm_nested_guest
*gp
;
961 unsigned int shift
, lpid
;
964 gpa
= n_rmap
& RMAP_NESTED_GPA_MASK
;
965 lpid
= (n_rmap
& RMAP_NESTED_LPID_MASK
) >> RMAP_NESTED_LPID_SHIFT
;
966 gp
= kvmhv_find_nested(kvm
, lpid
);
970 /* Find and invalidate the pte */
971 ptep
= find_kvm_nested_guest_pte(kvm
, lpid
, gpa
, &shift
);
972 /* Don't spuriously invalidate ptes if the pfn has changed */
973 if (ptep
&& pte_present(*ptep
) && ((pte_val(*ptep
) & mask
) == hpa
))
974 kvmppc_unmap_pte(kvm
, ptep
, gpa
, shift
, NULL
, gp
->shadow_lpid
);
977 static void kvmhv_remove_nest_rmap_list(struct kvm
*kvm
, unsigned long *rmapp
,
978 unsigned long hpa
, unsigned long mask
)
980 struct llist_node
*entry
= llist_del_all((struct llist_head
*) rmapp
);
981 struct rmap_nested
*cursor
;
984 for_each_nest_rmap_safe(cursor
, entry
, &rmap
) {
985 kvmhv_remove_nest_rmap(kvm
, rmap
, hpa
, mask
);
990 /* called with kvm->mmu_lock held */
991 void kvmhv_remove_nest_rmap_range(struct kvm
*kvm
,
992 const struct kvm_memory_slot
*memslot
,
993 unsigned long gpa
, unsigned long hpa
,
994 unsigned long nbytes
)
996 unsigned long gfn
, end_gfn
;
997 unsigned long addr_mask
;
1001 gfn
= (gpa
>> PAGE_SHIFT
) - memslot
->base_gfn
;
1002 end_gfn
= gfn
+ (nbytes
>> PAGE_SHIFT
);
1004 addr_mask
= PTE_RPN_MASK
& ~(nbytes
- 1);
1007 for (; gfn
< end_gfn
; gfn
++) {
1008 unsigned long *rmap
= &memslot
->arch
.rmap
[gfn
];
1009 kvmhv_remove_nest_rmap_list(kvm
, rmap
, hpa
, addr_mask
);
1013 static void kvmhv_free_memslot_nest_rmap(struct kvm_memory_slot
*free
)
1017 for (page
= 0; page
< free
->npages
; page
++) {
1018 unsigned long rmap
, *rmapp
= &free
->arch
.rmap
[page
];
1019 struct rmap_nested
*cursor
;
1020 struct llist_node
*entry
;
1022 entry
= llist_del_all((struct llist_head
*) rmapp
);
1023 for_each_nest_rmap_safe(cursor
, entry
, &rmap
)
1028 static bool kvmhv_invalidate_shadow_pte(struct kvm_vcpu
*vcpu
,
1029 struct kvm_nested_guest
*gp
,
1030 long gpa
, int *shift_ret
)
1032 struct kvm
*kvm
= vcpu
->kvm
;
1037 spin_lock(&kvm
->mmu_lock
);
1038 ptep
= find_kvm_nested_guest_pte(kvm
, gp
->l1_lpid
, gpa
, &shift
);
1041 if (ptep
&& pte_present(*ptep
)) {
1042 kvmppc_unmap_pte(kvm
, ptep
, gpa
, shift
, NULL
, gp
->shadow_lpid
);
1045 spin_unlock(&kvm
->mmu_lock
);
1052 static inline int get_ric(unsigned int instr
)
1054 return (instr
>> 18) & 0x3;
1057 static inline int get_prs(unsigned int instr
)
1059 return (instr
>> 17) & 0x1;
1062 static inline int get_r(unsigned int instr
)
1064 return (instr
>> 16) & 0x1;
1067 static inline int get_lpid(unsigned long r_val
)
1069 return r_val
& 0xffffffff;
1072 static inline int get_is(unsigned long r_val
)
1074 return (r_val
>> 10) & 0x3;
1077 static inline int get_ap(unsigned long r_val
)
1079 return (r_val
>> 5) & 0x7;
1082 static inline long get_epn(unsigned long r_val
)
1087 static int kvmhv_emulate_tlbie_tlb_addr(struct kvm_vcpu
*vcpu
, int lpid
,
1090 struct kvm
*kvm
= vcpu
->kvm
;
1091 struct kvm_nested_guest
*gp
;
1093 int shift
, shadow_shift
;
1096 shift
= ap_to_shift(ap
);
1099 /* Invalid ap encoding */
1102 addr
&= ~((1UL << shift
) - 1);
1103 npages
= 1UL << (shift
- PAGE_SHIFT
);
1105 gp
= kvmhv_get_nested(kvm
, lpid
, false);
1106 if (!gp
) /* No such guest -> nothing to do */
1108 mutex_lock(&gp
->tlb_lock
);
1110 /* There may be more than one host page backing this single guest pte */
1112 kvmhv_invalidate_shadow_pte(vcpu
, gp
, addr
, &shadow_shift
);
1114 npages
-= 1UL << (shadow_shift
- PAGE_SHIFT
);
1115 addr
+= 1UL << shadow_shift
;
1116 } while (npages
> 0);
1118 mutex_unlock(&gp
->tlb_lock
);
1119 kvmhv_put_nested(gp
);
1123 static void kvmhv_emulate_tlbie_lpid(struct kvm_vcpu
*vcpu
,
1124 struct kvm_nested_guest
*gp
, int ric
)
1126 struct kvm
*kvm
= vcpu
->kvm
;
1128 mutex_lock(&gp
->tlb_lock
);
1131 /* Invalidate TLB */
1132 spin_lock(&kvm
->mmu_lock
);
1133 kvmppc_free_pgtable_radix(kvm
, gp
->shadow_pgtable
,
1135 kvmhv_flush_lpid(gp
->shadow_lpid
);
1136 spin_unlock(&kvm
->mmu_lock
);
1141 * We don't cache this -> nothing to do
1145 /* Invalidate TLB, PWC and caching of partition table entries */
1146 kvmhv_flush_nested(gp
);
1151 mutex_unlock(&gp
->tlb_lock
);
1154 static void kvmhv_emulate_tlbie_all_lpid(struct kvm_vcpu
*vcpu
, int ric
)
1156 struct kvm
*kvm
= vcpu
->kvm
;
1157 struct kvm_nested_guest
*gp
;
1160 spin_lock(&kvm
->mmu_lock
);
1161 for (i
= 0; i
<= kvm
->arch
.max_nested_lpid
; i
++) {
1162 gp
= kvm
->arch
.nested_guests
[i
];
1164 spin_unlock(&kvm
->mmu_lock
);
1165 kvmhv_emulate_tlbie_lpid(vcpu
, gp
, ric
);
1166 spin_lock(&kvm
->mmu_lock
);
1169 spin_unlock(&kvm
->mmu_lock
);
1172 static int kvmhv_emulate_priv_tlbie(struct kvm_vcpu
*vcpu
, unsigned int instr
,
1173 unsigned long rsval
, unsigned long rbval
)
1175 struct kvm
*kvm
= vcpu
->kvm
;
1176 struct kvm_nested_guest
*gp
;
1177 int r
, ric
, prs
, is
, ap
;
1182 ric
= get_ric(instr
);
1183 prs
= get_prs(instr
);
1185 lpid
= get_lpid(rsval
);
1189 * These cases are invalid and are not handled:
1190 * r != 1 -> Only radix supported
1191 * prs == 1 -> Not HV privileged
1192 * ric == 3 -> No cluster bombs for radix
1193 * is == 1 -> Partition scoped translations not associated with pid
1194 * (!is) && (ric == 1 || ric == 2) -> Not supported by ISA
1196 if ((!r
) || (prs
) || (ric
== 3) || (is
== 1) ||
1197 ((!is
) && (ric
== 1 || ric
== 2)))
1204 * Invalidate TLB for a given target address
1206 epn
= get_epn(rbval
);
1208 ret
= kvmhv_emulate_tlbie_tlb_addr(vcpu
, lpid
, ap
, epn
);
1211 /* Invalidate matching LPID */
1212 gp
= kvmhv_get_nested(kvm
, lpid
, false);
1214 kvmhv_emulate_tlbie_lpid(vcpu
, gp
, ric
);
1215 kvmhv_put_nested(gp
);
1219 /* Invalidate ALL LPIDs */
1220 kvmhv_emulate_tlbie_all_lpid(vcpu
, ric
);
1231 * This handles the H_TLB_INVALIDATE hcall.
1232 * Parameters are (r4) tlbie instruction code, (r5) rS contents,
1235 long kvmhv_do_nested_tlbie(struct kvm_vcpu
*vcpu
)
1239 ret
= kvmhv_emulate_priv_tlbie(vcpu
, kvmppc_get_gpr(vcpu
, 4),
1240 kvmppc_get_gpr(vcpu
, 5), kvmppc_get_gpr(vcpu
, 6));
1246 static long do_tlb_invalidate_nested_all(struct kvm_vcpu
*vcpu
,
1247 unsigned long lpid
, unsigned long ric
)
1249 struct kvm
*kvm
= vcpu
->kvm
;
1250 struct kvm_nested_guest
*gp
;
1252 gp
= kvmhv_get_nested(kvm
, lpid
, false);
1254 kvmhv_emulate_tlbie_lpid(vcpu
, gp
, ric
);
1255 kvmhv_put_nested(gp
);
1261 * Number of pages above which we invalidate the entire LPID rather than
1262 * flush individual pages.
1264 static unsigned long tlb_range_flush_page_ceiling __read_mostly
= 33;
1266 static long do_tlb_invalidate_nested_tlb(struct kvm_vcpu
*vcpu
,
1268 unsigned long pg_sizes
,
1269 unsigned long start
,
1273 unsigned long addr
, nr_pages
;
1274 struct mmu_psize_def
*def
;
1275 unsigned long psize
, ap
, page_size
;
1278 for (psize
= 0; psize
< MMU_PAGE_COUNT
; psize
++) {
1279 def
= &mmu_psize_defs
[psize
];
1280 if (!(pg_sizes
& def
->h_rpt_pgsize
))
1283 nr_pages
= (end
- start
) >> def
->shift
;
1284 flush_lpid
= nr_pages
> tlb_range_flush_page_ceiling
;
1286 return do_tlb_invalidate_nested_all(vcpu
, lpid
,
1289 ap
= mmu_get_ap(psize
);
1290 page_size
= 1UL << def
->shift
;
1292 ret
= kvmhv_emulate_tlbie_tlb_addr(vcpu
, lpid
, ap
,
1297 } while (addr
< end
);
1303 * Performs partition-scoped invalidations for nested guests
1304 * as part of H_RPT_INVALIDATE hcall.
1306 long do_h_rpt_invalidate_pat(struct kvm_vcpu
*vcpu
, unsigned long lpid
,
1307 unsigned long type
, unsigned long pg_sizes
,
1308 unsigned long start
, unsigned long end
)
1311 * If L2 lpid isn't valid, we need to return H_PARAMETER.
1313 * However, nested KVM issues a L2 lpid flush call when creating
1314 * partition table entries for L2. This happens even before the
1315 * corresponding shadow lpid is created in HV which happens in
1316 * H_ENTER_NESTED call. Since we can't differentiate this case from
1317 * the invalid case, we ignore such flush requests and return success.
1319 if (!kvmhv_find_nested(vcpu
->kvm
, lpid
))
1323 * A flush all request can be handled by a full lpid flush only.
1325 if ((type
& H_RPTI_TYPE_NESTED_ALL
) == H_RPTI_TYPE_NESTED_ALL
)
1326 return do_tlb_invalidate_nested_all(vcpu
, lpid
, RIC_FLUSH_ALL
);
1329 * We don't need to handle a PWC flush like process table here,
1330 * because intermediate partition scoped table in nested guest doesn't
1331 * really have PWC. Only level we have PWC is in L0 and for nested
1332 * invalidate at L0 we always do kvm_flush_lpid() which does
1333 * radix__flush_all_lpid(). For range invalidate at any level, we
1334 * are not removing the higher level page tables and hence there is
1335 * no PWC invalidate needed.
1337 * if (type & H_RPTI_TYPE_PWC) {
1338 * ret = do_tlb_invalidate_nested_all(vcpu, lpid, RIC_FLUSH_PWC);
1344 if (start
== 0 && end
== -1)
1345 return do_tlb_invalidate_nested_all(vcpu
, lpid
, RIC_FLUSH_TLB
);
1347 if (type
& H_RPTI_TYPE_TLB
)
1348 return do_tlb_invalidate_nested_tlb(vcpu
, lpid
, pg_sizes
,
1353 /* Used to convert a nested guest real address to a L1 guest real address */
1354 static int kvmhv_translate_addr_nested(struct kvm_vcpu
*vcpu
,
1355 struct kvm_nested_guest
*gp
,
1356 unsigned long n_gpa
, unsigned long dsisr
,
1357 struct kvmppc_pte
*gpte_p
)
1359 u64 fault_addr
, flags
= dsisr
& DSISR_ISSTORE
;
1362 ret
= kvmppc_mmu_walk_radix_tree(vcpu
, n_gpa
, gpte_p
, gp
->l1_gr_to_hr
,
1366 /* We didn't find a pte */
1367 if (ret
== -EINVAL
) {
1368 /* Unsupported mmu config */
1369 flags
|= DSISR_UNSUPP_MMU
;
1370 } else if (ret
== -ENOENT
) {
1371 /* No translation found */
1372 flags
|= DSISR_NOHPTE
;
1373 } else if (ret
== -EFAULT
) {
1374 /* Couldn't access L1 real address */
1375 flags
|= DSISR_PRTABLE_FAULT
;
1376 vcpu
->arch
.fault_gpa
= fault_addr
;
1383 /* We found a pte -> check permissions */
1384 if (dsisr
& DSISR_ISSTORE
) {
1386 if (!gpte_p
->may_write
) {
1387 flags
|= DSISR_PROTFAULT
;
1390 } else if (vcpu
->arch
.trap
== BOOK3S_INTERRUPT_H_INST_STORAGE
) {
1391 /* Can we execute? */
1392 if (!gpte_p
->may_execute
) {
1393 flags
|= SRR1_ISI_N_G_OR_CIP
;
1398 if (!gpte_p
->may_read
&& !gpte_p
->may_write
) {
1399 flags
|= DSISR_PROTFAULT
;
1408 vcpu
->arch
.fault_dsisr
= flags
;
1409 if (vcpu
->arch
.trap
== BOOK3S_INTERRUPT_H_INST_STORAGE
) {
1410 vcpu
->arch
.shregs
.msr
&= SRR1_MSR_BITS
;
1411 vcpu
->arch
.shregs
.msr
|= flags
;
1416 static long kvmhv_handle_nested_set_rc(struct kvm_vcpu
*vcpu
,
1417 struct kvm_nested_guest
*gp
,
1418 unsigned long n_gpa
,
1419 struct kvmppc_pte gpte
,
1420 unsigned long dsisr
)
1422 struct kvm
*kvm
= vcpu
->kvm
;
1423 bool writing
= !!(dsisr
& DSISR_ISSTORE
);
1427 /* Are the rc bits set in the L1 partition scoped pte? */
1428 pgflags
= _PAGE_ACCESSED
;
1430 pgflags
|= _PAGE_DIRTY
;
1431 if (pgflags
& ~gpte
.rc
)
1434 spin_lock(&kvm
->mmu_lock
);
1435 /* Set the rc bit in the pte of our (L0) pgtable for the L1 guest */
1436 ret
= kvmppc_hv_handle_set_rc(kvm
, false, writing
,
1437 gpte
.raddr
, kvm
->arch
.lpid
);
1443 /* Set the rc bit in the pte of the shadow_pgtable for the nest guest */
1444 ret
= kvmppc_hv_handle_set_rc(kvm
, true, writing
,
1445 n_gpa
, gp
->l1_lpid
);
1452 spin_unlock(&kvm
->mmu_lock
);
1456 static inline int kvmppc_radix_level_to_shift(int level
)
1468 static inline int kvmppc_radix_shift_to_level(int shift
)
1470 if (shift
== PUD_SHIFT
)
1472 if (shift
== PMD_SHIFT
)
1474 if (shift
== PAGE_SHIFT
)
1480 /* called with gp->tlb_lock held */
1481 static long int __kvmhv_nested_page_fault(struct kvm_vcpu
*vcpu
,
1482 struct kvm_nested_guest
*gp
)
1484 struct kvm
*kvm
= vcpu
->kvm
;
1485 struct kvm_memory_slot
*memslot
;
1486 struct rmap_nested
*n_rmap
;
1487 struct kvmppc_pte gpte
;
1489 unsigned long mmu_seq
;
1490 unsigned long dsisr
= vcpu
->arch
.fault_dsisr
;
1491 unsigned long ea
= vcpu
->arch
.fault_dar
;
1492 unsigned long *rmapp
;
1493 unsigned long n_gpa
, gpa
, gfn
, perm
= 0UL;
1494 unsigned int shift
, l1_shift
, level
;
1495 bool writing
= !!(dsisr
& DSISR_ISSTORE
);
1496 bool kvm_ro
= false;
1499 if (!gp
->l1_gr_to_hr
) {
1500 kvmhv_update_ptbl_cache(gp
);
1501 if (!gp
->l1_gr_to_hr
)
1505 /* Convert the nested guest real address into a L1 guest real address */
1507 n_gpa
= vcpu
->arch
.fault_gpa
& ~0xF000000000000FFFULL
;
1508 if (!(dsisr
& DSISR_PRTABLE_FAULT
))
1509 n_gpa
|= ea
& 0xFFF;
1510 ret
= kvmhv_translate_addr_nested(vcpu
, gp
, n_gpa
, dsisr
, &gpte
);
1513 * If the hardware found a translation but we don't now have a usable
1514 * translation in the l1 partition-scoped tree, remove the shadow pte
1515 * and let the guest retry.
1517 if (ret
== RESUME_HOST
&&
1518 (dsisr
& (DSISR_PROTFAULT
| DSISR_BADACCESS
| DSISR_NOEXEC_OR_G
|
1519 DSISR_BAD_COPYPASTE
)))
1524 /* Failed to set the reference/change bits */
1525 if (dsisr
& DSISR_SET_RC
) {
1526 ret
= kvmhv_handle_nested_set_rc(vcpu
, gp
, n_gpa
, gpte
, dsisr
);
1527 if (ret
== RESUME_HOST
)
1531 dsisr
&= ~DSISR_SET_RC
;
1532 if (!(dsisr
& (DSISR_BAD_FAULT_64S
| DSISR_NOHPTE
|
1534 return RESUME_GUEST
;
1538 * We took an HISI or HDSI while we were running a nested guest which
1539 * means we have no partition scoped translation for that. This means
1540 * we need to insert a pte for the mapping into our shadow_pgtable.
1543 l1_shift
= gpte
.page_shift
;
1544 if (l1_shift
< PAGE_SHIFT
) {
1545 /* We don't support l1 using a page size smaller than our own */
1546 pr_err("KVM: L1 guest page shift (%d) less than our own (%d)\n",
1547 l1_shift
, PAGE_SHIFT
);
1551 gfn
= gpa
>> PAGE_SHIFT
;
1553 /* 1. Get the corresponding host memslot */
1555 memslot
= gfn_to_memslot(kvm
, gfn
);
1556 if (!memslot
|| (memslot
->flags
& KVM_MEMSLOT_INVALID
)) {
1557 if (dsisr
& (DSISR_PRTABLE_FAULT
| DSISR_BADACCESS
)) {
1558 /* unusual error -> reflect to the guest as a DSI */
1559 kvmppc_core_queue_data_storage(vcpu
, ea
, dsisr
);
1560 return RESUME_GUEST
;
1563 /* passthrough of emulated MMIO case */
1564 return kvmppc_hv_emulate_mmio(vcpu
, gpa
, ea
, writing
);
1566 if (memslot
->flags
& KVM_MEM_READONLY
) {
1568 /* Give the guest a DSI */
1569 kvmppc_core_queue_data_storage(vcpu
, ea
,
1570 DSISR_ISSTORE
| DSISR_PROTFAULT
);
1571 return RESUME_GUEST
;
1576 /* 2. Find the host pte for this L1 guest real address */
1578 /* Used to check for invalidations in progress */
1579 mmu_seq
= kvm
->mmu_notifier_seq
;
1582 /* See if can find translation in our partition scoped tables for L1 */
1584 spin_lock(&kvm
->mmu_lock
);
1585 pte_p
= find_kvm_secondary_pte(kvm
, gpa
, &shift
);
1590 spin_unlock(&kvm
->mmu_lock
);
1592 if (!pte_present(pte
) || (writing
&& !(pte_val(pte
) & _PAGE_WRITE
))) {
1593 /* No suitable pte found -> try to insert a mapping */
1594 ret
= kvmppc_book3s_instantiate_page(vcpu
, gpa
, memslot
,
1595 writing
, kvm_ro
, &pte
, &level
);
1597 return RESUME_GUEST
;
1600 shift
= kvmppc_radix_level_to_shift(level
);
1602 /* Align gfn to the start of the page */
1603 gfn
= (gpa
& ~((1UL << shift
) - 1)) >> PAGE_SHIFT
;
1605 /* 3. Compute the pte we need to insert for nest_gpa -> host r_addr */
1607 /* The permissions is the combination of the host and l1 guest ptes */
1608 perm
|= gpte
.may_read
? 0UL : _PAGE_READ
;
1609 perm
|= gpte
.may_write
? 0UL : _PAGE_WRITE
;
1610 perm
|= gpte
.may_execute
? 0UL : _PAGE_EXEC
;
1611 /* Only set accessed/dirty (rc) bits if set in host and l1 guest ptes */
1612 perm
|= (gpte
.rc
& _PAGE_ACCESSED
) ? 0UL : _PAGE_ACCESSED
;
1613 perm
|= ((gpte
.rc
& _PAGE_DIRTY
) && writing
) ? 0UL : _PAGE_DIRTY
;
1614 pte
= __pte(pte_val(pte
) & ~perm
);
1616 /* What size pte can we insert? */
1617 if (shift
> l1_shift
) {
1619 unsigned int actual_shift
= PAGE_SHIFT
;
1620 if (PMD_SHIFT
< l1_shift
)
1621 actual_shift
= PMD_SHIFT
;
1622 mask
= (1UL << shift
) - (1UL << actual_shift
);
1623 pte
= __pte(pte_val(pte
) | (gpa
& mask
));
1624 shift
= actual_shift
;
1626 level
= kvmppc_radix_shift_to_level(shift
);
1627 n_gpa
&= ~((1UL << shift
) - 1);
1629 /* 4. Insert the pte into our shadow_pgtable */
1631 n_rmap
= kzalloc(sizeof(*n_rmap
), GFP_KERNEL
);
1633 return RESUME_GUEST
; /* Let the guest try again */
1634 n_rmap
->rmap
= (n_gpa
& RMAP_NESTED_GPA_MASK
) |
1635 (((unsigned long) gp
->l1_lpid
) << RMAP_NESTED_LPID_SHIFT
);
1636 rmapp
= &memslot
->arch
.rmap
[gfn
- memslot
->base_gfn
];
1637 ret
= kvmppc_create_pte(kvm
, gp
->shadow_pgtable
, pte
, n_gpa
, level
,
1638 mmu_seq
, gp
->shadow_lpid
, rmapp
, &n_rmap
);
1641 ret
= RESUME_GUEST
; /* Let the guest try again */
1646 kvmhv_invalidate_shadow_pte(vcpu
, gp
, n_gpa
, NULL
);
1647 return RESUME_GUEST
;
1650 long int kvmhv_nested_page_fault(struct kvm_vcpu
*vcpu
)
1652 struct kvm_nested_guest
*gp
= vcpu
->arch
.nested
;
1655 mutex_lock(&gp
->tlb_lock
);
1656 ret
= __kvmhv_nested_page_fault(vcpu
, gp
);
1657 mutex_unlock(&gp
->tlb_lock
);
1661 int kvmhv_nested_next_lpid(struct kvm
*kvm
, int lpid
)
1665 spin_lock(&kvm
->mmu_lock
);
1666 while (++lpid
<= kvm
->arch
.max_nested_lpid
) {
1667 if (kvm
->arch
.nested_guests
[lpid
]) {
1672 spin_unlock(&kvm
->mmu_lock
);