2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License, version 2, as
4 * published by the Free Software Foundation.
6 * This program is distributed in the hope that it will be useful,
7 * but WITHOUT ANY WARRANTY; without even the implied warranty of
8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
9 * GNU General Public License for more details.
11 * You should have received a copy of the GNU General Public License
12 * along with this program; if not, write to the Free Software
13 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
15 * Copyright SUSE Linux Products GmbH 2010
17 * Authors: Alexander Graf <agraf@suse.de>
20 #ifndef __ASM_KVM_BOOK3S_64_H__
21 #define __ASM_KVM_BOOK3S_64_H__
23 #include <linux/string.h>
24 #include <asm/bitops.h>
25 #include <asm/book3s/64/mmu-hash.h>
26 #include <asm/cpu_has_feature.h>
28 #ifdef CONFIG_PPC_PSERIES
29 static inline bool kvmhv_on_pseries(void)
31 return !cpu_has_feature(CPU_FTR_HVMODE);
34 static inline bool kvmhv_on_pseries(void)
41 * Structure for a nested guest, that is, for a guest that is managed by
44 struct kvm_nested_guest {
45 struct kvm *l1_host; /* L1 VM that owns this nested guest */
46 int l1_lpid; /* lpid L1 guest thinks this guest is */
47 int shadow_lpid; /* real lpid of this nested guest */
48 pgd_t *shadow_pgtable; /* our page table for this guest */
49 u64 l1_gr_to_hr; /* L1's addr of part'n-scoped table */
50 u64 process_table; /* process table entry for this guest */
51 long refcnt; /* number of pointers to this struct */
52 struct mutex tlb_lock; /* serialize page faults and tlbies */
53 struct kvm_nested_guest *next;
57 * We define a nested rmap entry as a single 64-bit quantity
58 * 0xFFF0000000000000 12-bit lpid field
59 * 0x000FFFFFFFFFF000 40-bit guest 4k page frame number
60 * 0x0000000000000001 1-bit single entry flag
62 #define RMAP_NESTED_LPID_MASK 0xFFF0000000000000UL
63 #define RMAP_NESTED_LPID_SHIFT (52)
64 #define RMAP_NESTED_GPA_MASK 0x000FFFFFFFFFF000UL
65 #define RMAP_NESTED_IS_SINGLE_ENTRY 0x0000000000000001UL
67 /* Structure for a nested guest rmap entry */
69 struct llist_node list;
74 * for_each_nest_rmap_safe - iterate over the list of nested rmap entries
75 * safe against removal of the list entry or NULL list
76 * @pos: a (struct rmap_nested *) to use as a loop cursor
77 * @node: pointer to the first entry
78 * NOTE: this can be NULL
79 * @rmapp: an (unsigned long *) in which to return the rmap entries on each
81 * NOTE: this must point to already allocated memory
83 * The nested_rmap is a llist of (struct rmap_nested) entries pointed to by the
84 * rmap entry in the memslot. The list is always terminated by a "single entry"
85 * stored in the list element of the final entry of the llist. If there is ONLY
86 * a single entry then this is itself in the rmap entry of the memslot, not a
89 * Note that the iterator below assumes that a nested rmap entry is always
90 * non-zero. This is true for our usage because the LPID field is always
91 * non-zero (zero is reserved for the host).
93 * This should be used to iterate over the list of rmap_nested entries with
94 * processing done on the u64 rmap value given by each iteration. This is safe
95 * against removal of list entries and it is always safe to call free on (pos).
98 * struct rmap_nested *cursor;
99 * struct llist_node *first;
100 * unsigned long rmap;
101 * for_each_nest_rmap_safe(cursor, first, &rmap) {
102 * do_something(rmap);
106 #define for_each_nest_rmap_safe(pos, node, rmapp) \
107 for ((pos) = llist_entry((node), typeof(*(pos)), list); \
109 (*(rmapp) = ((RMAP_NESTED_IS_SINGLE_ENTRY & ((u64) (node))) ? \
110 ((u64) (node)) : ((pos)->rmap))) && \
111 (((node) = ((RMAP_NESTED_IS_SINGLE_ENTRY & ((u64) (node))) ? \
112 ((struct llist_node *) ((pos) = NULL)) : \
113 (pos)->list.next)), true); \
114 (pos) = llist_entry((node), typeof(*(pos)), list))
116 struct kvm_nested_guest *kvmhv_get_nested(struct kvm *kvm, int l1_lpid,
118 void kvmhv_put_nested(struct kvm_nested_guest *gp);
120 /* Power architecture requires HPT is at least 256kiB, at most 64TiB */
121 #define PPC_MIN_HPT_ORDER 18
122 #define PPC_MAX_HPT_ORDER 46
124 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
125 static inline struct kvmppc_book3s_shadow_vcpu *svcpu_get(struct kvm_vcpu *vcpu)
128 return &get_paca()->shadow_vcpu;
131 static inline void svcpu_put(struct kvmppc_book3s_shadow_vcpu *svcpu)
137 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
139 static inline bool kvm_is_radix(struct kvm *kvm)
141 return kvm->arch.radix;
144 #define KVM_DEFAULT_HPT_ORDER 24 /* 16MB HPT by default */
148 * We use a lock bit in HPTE dword 0 to synchronize updates and
149 * accesses to each HPTE, and another bit to indicate non-present
152 #define HPTE_V_HVLOCK 0x40UL
153 #define HPTE_V_ABSENT 0x20UL
156 * We use this bit in the guest_rpte field of the revmap entry
157 * to indicate a modified HPTE.
159 #define HPTE_GR_MODIFIED (1ul << 62)
161 /* These bits are reserved in the guest view of the HPTE */
162 #define HPTE_GR_RESERVED HPTE_GR_MODIFIED
164 static inline long try_lock_hpte(__be64 *hpte, unsigned long bits)
166 unsigned long tmp, old;
167 __be64 be_lockbit, be_bits;
170 * We load/store in native endian, but the HTAB is in big endian. If
171 * we byte swap all data we apply on the PTE we're implicitly correct
174 be_lockbit = cpu_to_be64(HPTE_V_HVLOCK);
175 be_bits = cpu_to_be64(bits);
177 asm volatile(" ldarx %0,0,%2\n"
185 : "=&r" (tmp), "=&r" (old)
186 : "r" (hpte), "r" (be_bits), "r" (be_lockbit)
191 static inline void unlock_hpte(__be64 *hpte, unsigned long hpte_v)
193 hpte_v &= ~HPTE_V_HVLOCK;
194 asm volatile(PPC_RELEASE_BARRIER "" : : : "memory");
195 hpte[0] = cpu_to_be64(hpte_v);
198 /* Without barrier */
199 static inline void __unlock_hpte(__be64 *hpte, unsigned long hpte_v)
201 hpte_v &= ~HPTE_V_HVLOCK;
202 hpte[0] = cpu_to_be64(hpte_v);
206 * These functions encode knowledge of the POWER7/8/9 hardware
207 * interpretations of the HPTE LP (large page size) field.
209 static inline int kvmppc_hpte_page_shifts(unsigned long h, unsigned long l)
213 if (!(h & HPTE_V_LARGE))
215 lphi = (l >> 16) & 0xf;
216 switch ((l >> 12) & 0xf) {
218 return !lphi ? 24 : 0; /* 16MB */
221 return 16; /* 64kB */
224 return !lphi ? 34 : 0; /* 16GB */
227 return (16 << 8) + 12; /* 64kB in 4kB */
231 return (24 << 8) + 16; /* 16MB in 64kkB */
233 return (24 << 8) + 12; /* 16MB in 4kB */
239 static inline int kvmppc_hpte_base_page_shift(unsigned long h, unsigned long l)
241 return kvmppc_hpte_page_shifts(h, l) & 0xff;
244 static inline int kvmppc_hpte_actual_page_shift(unsigned long h, unsigned long l)
246 int tmp = kvmppc_hpte_page_shifts(h, l);
253 static inline unsigned long kvmppc_actual_pgsz(unsigned long v, unsigned long r)
255 int shift = kvmppc_hpte_actual_page_shift(v, r);
262 static inline int kvmppc_pgsize_lp_encoding(int base_shift, int actual_shift)
264 switch (base_shift) {
266 switch (actual_shift) {
276 switch (actual_shift) {
289 static inline unsigned long compute_tlbie_rb(unsigned long v, unsigned long r,
290 unsigned long pte_index)
292 int a_pgshift, b_pgshift;
293 unsigned long rb = 0, va_low, sllp;
295 b_pgshift = a_pgshift = kvmppc_hpte_page_shifts(v, r);
296 if (a_pgshift >= 0x100) {
302 * Ignore the top 14 bits of va
303 * v have top two bits covering segment size, hence move
304 * by 16 bits, Also clear the lower HPTE_V_AVPN_SHIFT (7) bits.
305 * AVA field in v also have the lower 23 bits ignored.
306 * For base page size 4K we need 14 .. 65 bits (so need to
307 * collect extra 11 bits)
308 * For others we need 14..14+i
310 /* This covers 14..54 bits of va*/
311 rb = (v & ~0x7fUL) << 16; /* AVA field */
314 * AVA in v had cleared lower 23 bits. We need to derive
315 * that from pteg index
317 va_low = pte_index >> 3;
318 if (v & HPTE_V_SECONDARY)
321 * get the vpn bits from va_low using reverse of hashing.
322 * In v we have va with 23 bits dropped and then left shifted
323 * HPTE_V_AVPN_SHIFT (7) bits. Now to find vsid we need
324 * right shift it with (SID_SHIFT - (23 - 7))
326 if (!(v & HPTE_V_1TB_SEG))
327 va_low ^= v >> (SID_SHIFT - 16);
329 va_low ^= v >> (SID_SHIFT_1T - 16);
332 if (b_pgshift <= 12) {
333 if (a_pgshift > 12) {
334 sllp = (a_pgshift == 16) ? 5 : 4;
335 rb |= sllp << 5; /* AP field */
337 rb |= (va_low & 0x7ff) << 12; /* remaining 11 bits of AVA */
341 * remaining bits of AVA/LP fields
342 * Also contain the rr bits of LP
344 rb |= (va_low << b_pgshift) & 0x7ff000;
346 * Now clear not needed LP bits based on actual psize
348 rb &= ~((1ul << a_pgshift) - 1);
350 * AVAL field 58..77 - base_page_shift bits of va
351 * we have space for 58..64 bits, Missing bits should
352 * be zero filled. +1 is to take care of L bit shift
354 aval_shift = 64 - (77 - b_pgshift) + 1;
355 rb |= ((va_low << aval_shift) & 0xfe);
357 rb |= 1; /* L field */
358 rb |= r & 0xff000 & ((1ul << a_pgshift) - 1); /* LP field */
360 rb |= (v >> HPTE_V_SSIZE_SHIFT) << 8; /* B field */
364 static inline unsigned long hpte_rpn(unsigned long ptel, unsigned long psize)
366 return ((ptel & HPTE_R_RPN) & ~(psize - 1)) >> PAGE_SHIFT;
369 static inline int hpte_is_writable(unsigned long ptel)
371 unsigned long pp = ptel & (HPTE_R_PP0 | HPTE_R_PP);
373 return pp != PP_RXRX && pp != PP_RXXX;
376 static inline unsigned long hpte_make_readonly(unsigned long ptel)
378 if ((ptel & HPTE_R_PP0) || (ptel & HPTE_R_PP) == PP_RWXX)
379 ptel = (ptel & ~HPTE_R_PP) | PP_RXXX;
385 static inline bool hpte_cache_flags_ok(unsigned long hptel, bool is_ci)
387 unsigned int wimg = hptel & HPTE_R_WIMG;
390 if (wimg == (HPTE_R_W | HPTE_R_I | HPTE_R_M) &&
391 cpu_has_feature(CPU_FTR_ARCH_206))
395 return wimg == HPTE_R_M;
397 * if host is mapped cache inhibited, make sure hptel also have
400 if (wimg & HPTE_R_W) /* FIXME!! is this ok for all guest. ? */
402 return !!(wimg & HPTE_R_I);
406 * If it's present and writable, atomically set dirty and referenced bits and
407 * return the PTE, otherwise return 0.
409 static inline pte_t kvmppc_read_update_linux_pte(pte_t *ptep, int writing)
411 pte_t old_pte, new_pte = __pte(0);
415 * Make sure we don't reload from ptep
417 old_pte = READ_ONCE(*ptep);
419 * wait until H_PAGE_BUSY is clear then set it atomically
421 if (unlikely(pte_val(old_pte) & H_PAGE_BUSY)) {
425 /* If pte is not present return None */
426 if (unlikely(!(pte_val(old_pte) & _PAGE_PRESENT)))
429 new_pte = pte_mkyoung(old_pte);
430 if (writing && pte_write(old_pte))
431 new_pte = pte_mkdirty(new_pte);
433 if (pte_xchg(ptep, old_pte, new_pte))
439 static inline bool hpte_read_permission(unsigned long pp, unsigned long key)
442 return PP_RWRX <= pp && pp <= PP_RXRX;
446 static inline bool hpte_write_permission(unsigned long pp, unsigned long key)
449 return pp == PP_RWRW;
450 return pp <= PP_RWRW;
453 static inline int hpte_get_skey_perm(unsigned long hpte_r, unsigned long amr)
457 skey = ((hpte_r & HPTE_R_KEY_HI) >> 57) |
458 ((hpte_r & HPTE_R_KEY_LO) >> 9);
459 return (amr >> (62 - 2 * skey)) & 3;
462 static inline void lock_rmap(unsigned long *rmap)
465 while (test_bit(KVMPPC_RMAP_LOCK_BIT, rmap))
467 } while (test_and_set_bit_lock(KVMPPC_RMAP_LOCK_BIT, rmap));
470 static inline void unlock_rmap(unsigned long *rmap)
472 __clear_bit_unlock(KVMPPC_RMAP_LOCK_BIT, rmap);
475 static inline bool slot_is_aligned(struct kvm_memory_slot *memslot,
476 unsigned long pagesize)
478 unsigned long mask = (pagesize >> PAGE_SHIFT) - 1;
480 if (pagesize <= PAGE_SIZE)
482 return !(memslot->base_gfn & mask) && !(memslot->npages & mask);
486 * This works for 4k, 64k and 16M pages on POWER7,
487 * and 4k and 16M pages on PPC970.
489 static inline unsigned long slb_pgsize_encoding(unsigned long psize)
491 unsigned long senc = 0;
493 if (psize > 0x1000) {
495 if (psize == 0x10000)
496 senc |= SLB_VSID_LP_01;
501 static inline int is_vrma_hpte(unsigned long hpte_v)
503 return (hpte_v & ~0xffffffUL) ==
504 (HPTE_V_1TB_SEG | (VRMA_VSID << (40 - 16)));
507 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
509 * Note modification of an HPTE; set the HPTE modified bit
510 * if anyone is interested.
512 static inline void note_hpte_modification(struct kvm *kvm,
513 struct revmap_entry *rev)
515 if (atomic_read(&kvm->arch.hpte_mod_interest))
516 rev->guest_rpte |= HPTE_GR_MODIFIED;
520 * Like kvm_memslots(), but for use in real mode when we can't do
521 * any RCU stuff (since the secondary threads are offline from the
522 * kernel's point of view), and we can't print anything.
523 * Thus we use rcu_dereference_raw() rather than rcu_dereference_check().
525 static inline struct kvm_memslots *kvm_memslots_raw(struct kvm *kvm)
527 return rcu_dereference_raw_notrace(kvm->memslots[0]);
530 extern void kvmppc_mmu_debugfs_init(struct kvm *kvm);
531 extern void kvmhv_radix_debugfs_init(struct kvm *kvm);
533 extern void kvmhv_rm_send_ipi(int cpu);
535 static inline unsigned long kvmppc_hpt_npte(struct kvm_hpt_info *hpt)
537 /* HPTEs are 2**4 bytes long */
538 return 1UL << (hpt->order - 4);
541 static inline unsigned long kvmppc_hpt_mask(struct kvm_hpt_info *hpt)
543 /* 128 (2**7) bytes in each HPTEG */
544 return (1UL << (hpt->order - 7)) - 1;
547 /* Set bits in a dirty bitmap, which is in LE format */
548 static inline void set_dirty_bits(unsigned long *map, unsigned long i,
549 unsigned long npages)
553 memset((char *)map + i / 8, 0xff, npages / 8);
555 for (; npages; ++i, --npages)
556 __set_bit_le(i, map);
559 static inline void set_dirty_bits_atomic(unsigned long *map, unsigned long i,
560 unsigned long npages)
563 memset((char *)map + i / 8, 0xff, npages / 8);
565 for (; npages; ++i, --npages)
569 static inline u64 sanitize_msr(u64 msr)
576 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
577 static inline void copy_from_checkpoint(struct kvm_vcpu *vcpu)
579 vcpu->arch.regs.ccr = vcpu->arch.cr_tm;
580 vcpu->arch.regs.xer = vcpu->arch.xer_tm;
581 vcpu->arch.regs.link = vcpu->arch.lr_tm;
582 vcpu->arch.regs.ctr = vcpu->arch.ctr_tm;
583 vcpu->arch.amr = vcpu->arch.amr_tm;
584 vcpu->arch.ppr = vcpu->arch.ppr_tm;
585 vcpu->arch.dscr = vcpu->arch.dscr_tm;
586 vcpu->arch.tar = vcpu->arch.tar_tm;
587 memcpy(vcpu->arch.regs.gpr, vcpu->arch.gpr_tm,
588 sizeof(vcpu->arch.regs.gpr));
589 vcpu->arch.fp = vcpu->arch.fp_tm;
590 vcpu->arch.vr = vcpu->arch.vr_tm;
591 vcpu->arch.vrsave = vcpu->arch.vrsave_tm;
594 static inline void copy_to_checkpoint(struct kvm_vcpu *vcpu)
596 vcpu->arch.cr_tm = vcpu->arch.regs.ccr;
597 vcpu->arch.xer_tm = vcpu->arch.regs.xer;
598 vcpu->arch.lr_tm = vcpu->arch.regs.link;
599 vcpu->arch.ctr_tm = vcpu->arch.regs.ctr;
600 vcpu->arch.amr_tm = vcpu->arch.amr;
601 vcpu->arch.ppr_tm = vcpu->arch.ppr;
602 vcpu->arch.dscr_tm = vcpu->arch.dscr;
603 vcpu->arch.tar_tm = vcpu->arch.tar;
604 memcpy(vcpu->arch.gpr_tm, vcpu->arch.regs.gpr,
605 sizeof(vcpu->arch.regs.gpr));
606 vcpu->arch.fp_tm = vcpu->arch.fp;
607 vcpu->arch.vr_tm = vcpu->arch.vr;
608 vcpu->arch.vrsave_tm = vcpu->arch.vrsave;
610 #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
612 extern int kvmppc_create_pte(struct kvm *kvm, pgd_t *pgtable, pte_t pte,
613 unsigned long gpa, unsigned int level,
614 unsigned long mmu_seq, unsigned int lpid,
615 unsigned long *rmapp, struct rmap_nested **n_rmap);
616 extern void kvmhv_insert_nest_rmap(struct kvm *kvm, unsigned long *rmapp,
617 struct rmap_nested **n_rmap);
618 extern void kvmhv_remove_nest_rmap_range(struct kvm *kvm,
619 struct kvm_memory_slot *memslot,
620 unsigned long gpa, unsigned long hpa,
621 unsigned long nbytes);
623 #endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */
625 #endif /* __ASM_KVM_BOOK3S_64_H__ */