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TOMOYO Linux Cross Reference
Linux/arch/powerpc/include/asm/kvm_book3s.h

Version: ~ [ linux-5.4.2 ] ~ [ linux-5.3.15 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.88 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.158 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.206 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.206 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.78 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  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.
  5  *
  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.
 10  *
 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.
 14  *
 15  * Copyright SUSE Linux Products GmbH 2009
 16  *
 17  * Authors: Alexander Graf <agraf@suse.de>
 18  */
 19 
 20 #ifndef __ASM_KVM_BOOK3S_H__
 21 #define __ASM_KVM_BOOK3S_H__
 22 
 23 #include <linux/types.h>
 24 #include <linux/kvm_host.h>
 25 #include <asm/kvm_book3s_asm.h>
 26 
 27 struct kvmppc_bat {
 28         u64 raw;
 29         u32 bepi;
 30         u32 bepi_mask;
 31         u32 brpn;
 32         u8 wimg;
 33         u8 pp;
 34         bool vs         : 1;
 35         bool vp         : 1;
 36 };
 37 
 38 struct kvmppc_sid_map {
 39         u64 guest_vsid;
 40         u64 guest_esid;
 41         u64 host_vsid;
 42         bool valid      : 1;
 43 };
 44 
 45 #define SID_MAP_BITS    9
 46 #define SID_MAP_NUM     (1 << SID_MAP_BITS)
 47 #define SID_MAP_MASK    (SID_MAP_NUM - 1)
 48 
 49 #ifdef CONFIG_PPC_BOOK3S_64
 50 #define SID_CONTEXTS    1
 51 #else
 52 #define SID_CONTEXTS    128
 53 #define VSID_POOL_SIZE  (SID_CONTEXTS * 16)
 54 #endif
 55 
 56 struct hpte_cache {
 57         struct hlist_node list_pte;
 58         struct hlist_node list_pte_long;
 59         struct hlist_node list_vpte;
 60         struct hlist_node list_vpte_long;
 61 #ifdef CONFIG_PPC_BOOK3S_64
 62         struct hlist_node list_vpte_64k;
 63 #endif
 64         struct rcu_head rcu_head;
 65         u64 host_vpn;
 66         u64 pfn;
 67         ulong slot;
 68         struct kvmppc_pte pte;
 69         int pagesize;
 70 };
 71 
 72 /*
 73  * Struct for a virtual core.
 74  * Note: entry_exit_map combines a bitmap of threads that have entered
 75  * in the bottom 8 bits and a bitmap of threads that have exited in the
 76  * next 8 bits.  This is so that we can atomically set the entry bit
 77  * iff the exit map is 0 without taking a lock.
 78  */
 79 struct kvmppc_vcore {
 80         int n_runnable;
 81         int num_threads;
 82         int entry_exit_map;
 83         int napping_threads;
 84         int first_vcpuid;
 85         u16 pcpu;
 86         u16 last_cpu;
 87         u8 vcore_state;
 88         u8 in_guest;
 89         struct kvm_vcpu *runnable_threads[MAX_SMT_THREADS];
 90         struct list_head preempt_list;
 91         spinlock_t lock;
 92         struct swait_queue_head wq;
 93         spinlock_t stoltb_lock; /* protects stolen_tb and preempt_tb */
 94         u64 stolen_tb;
 95         u64 preempt_tb;
 96         struct kvm_vcpu *runner;
 97         struct kvm *kvm;
 98         u64 tb_offset;          /* guest timebase - host timebase */
 99         u64 tb_offset_applied;  /* timebase offset currently in force */
100         ulong lpcr;
101         u32 arch_compat;
102         ulong pcr;
103         ulong dpdes;            /* doorbell state (POWER8) */
104         ulong vtb;              /* virtual timebase */
105         ulong conferring_threads;
106         unsigned int halt_poll_ns;
107         atomic_t online_count;
108 };
109 
110 struct kvmppc_vcpu_book3s {
111         struct kvmppc_sid_map sid_map[SID_MAP_NUM];
112         struct {
113                 u64 esid;
114                 u64 vsid;
115         } slb_shadow[64];
116         u8 slb_shadow_max;
117         struct kvmppc_bat ibat[8];
118         struct kvmppc_bat dbat[8];
119         u64 hid[6];
120         u64 gqr[8];
121         u64 sdr1;
122         u64 hior;
123         u64 msr_mask;
124         u64 vtb;
125 #ifdef CONFIG_PPC_BOOK3S_32
126         u32 vsid_pool[VSID_POOL_SIZE];
127         u32 vsid_next;
128 #else
129         u64 proto_vsid_first;
130         u64 proto_vsid_max;
131         u64 proto_vsid_next;
132 #endif
133         int context_id[SID_CONTEXTS];
134 
135         bool hior_explicit;             /* HIOR is set by ioctl, not PVR */
136 
137         struct hlist_head hpte_hash_pte[HPTEG_HASH_NUM_PTE];
138         struct hlist_head hpte_hash_pte_long[HPTEG_HASH_NUM_PTE_LONG];
139         struct hlist_head hpte_hash_vpte[HPTEG_HASH_NUM_VPTE];
140         struct hlist_head hpte_hash_vpte_long[HPTEG_HASH_NUM_VPTE_LONG];
141 #ifdef CONFIG_PPC_BOOK3S_64
142         struct hlist_head hpte_hash_vpte_64k[HPTEG_HASH_NUM_VPTE_64K];
143 #endif
144         int hpte_cache_count;
145         spinlock_t mmu_lock;
146 };
147 
148 #define VSID_REAL       0x07ffffffffc00000ULL
149 #define VSID_BAT        0x07ffffffffb00000ULL
150 #define VSID_64K        0x0800000000000000ULL
151 #define VSID_1T         0x1000000000000000ULL
152 #define VSID_REAL_DR    0x2000000000000000ULL
153 #define VSID_REAL_IR    0x4000000000000000ULL
154 #define VSID_PR         0x8000000000000000ULL
155 
156 extern void kvmppc_mmu_pte_flush(struct kvm_vcpu *vcpu, ulong ea, ulong ea_mask);
157 extern void kvmppc_mmu_pte_vflush(struct kvm_vcpu *vcpu, u64 vp, u64 vp_mask);
158 extern void kvmppc_mmu_pte_pflush(struct kvm_vcpu *vcpu, ulong pa_start, ulong pa_end);
159 extern void kvmppc_set_msr(struct kvm_vcpu *vcpu, u64 new_msr);
160 extern void kvmppc_mmu_book3s_64_init(struct kvm_vcpu *vcpu);
161 extern void kvmppc_mmu_book3s_32_init(struct kvm_vcpu *vcpu);
162 extern void kvmppc_mmu_book3s_hv_init(struct kvm_vcpu *vcpu);
163 extern int kvmppc_mmu_map_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte,
164                                bool iswrite);
165 extern void kvmppc_mmu_unmap_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte);
166 extern int kvmppc_mmu_map_segment(struct kvm_vcpu *vcpu, ulong eaddr);
167 extern void kvmppc_mmu_flush_segment(struct kvm_vcpu *vcpu, ulong eaddr, ulong seg_size);
168 extern void kvmppc_mmu_flush_segments(struct kvm_vcpu *vcpu);
169 extern int kvmppc_book3s_hv_page_fault(struct kvm_run *run,
170                         struct kvm_vcpu *vcpu, unsigned long addr,
171                         unsigned long status);
172 extern long kvmppc_hv_find_lock_hpte(struct kvm *kvm, gva_t eaddr,
173                         unsigned long slb_v, unsigned long valid);
174 extern int kvmppc_hv_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu,
175                         unsigned long gpa, gva_t ea, int is_store);
176 
177 extern void kvmppc_mmu_hpte_cache_map(struct kvm_vcpu *vcpu, struct hpte_cache *pte);
178 extern struct hpte_cache *kvmppc_mmu_hpte_cache_next(struct kvm_vcpu *vcpu);
179 extern void kvmppc_mmu_hpte_cache_free(struct hpte_cache *pte);
180 extern void kvmppc_mmu_hpte_destroy(struct kvm_vcpu *vcpu);
181 extern int kvmppc_mmu_hpte_init(struct kvm_vcpu *vcpu);
182 extern void kvmppc_mmu_invalidate_pte(struct kvm_vcpu *vcpu, struct hpte_cache *pte);
183 extern int kvmppc_mmu_hpte_sysinit(void);
184 extern void kvmppc_mmu_hpte_sysexit(void);
185 extern int kvmppc_mmu_hv_init(void);
186 extern int kvmppc_book3s_hcall_implemented(struct kvm *kvm, unsigned long hc);
187 
188 extern int kvmppc_book3s_radix_page_fault(struct kvm_run *run,
189                         struct kvm_vcpu *vcpu,
190                         unsigned long ea, unsigned long dsisr);
191 extern int kvmppc_mmu_walk_radix_tree(struct kvm_vcpu *vcpu, gva_t eaddr,
192                                       struct kvmppc_pte *gpte, u64 root,
193                                       u64 *pte_ret_p);
194 extern int kvmppc_mmu_radix_translate_table(struct kvm_vcpu *vcpu, gva_t eaddr,
195                         struct kvmppc_pte *gpte, u64 table,
196                         int table_index, u64 *pte_ret_p);
197 extern int kvmppc_mmu_radix_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
198                         struct kvmppc_pte *gpte, bool data, bool iswrite);
199 extern void kvmppc_unmap_pte(struct kvm *kvm, pte_t *pte, unsigned long gpa,
200                         unsigned int shift, struct kvm_memory_slot *memslot,
201                         unsigned int lpid);
202 extern bool kvmppc_hv_handle_set_rc(struct kvm *kvm, pgd_t *pgtable,
203                                     bool writing, unsigned long gpa,
204                                     unsigned int lpid);
205 extern int kvmppc_book3s_instantiate_page(struct kvm_vcpu *vcpu,
206                                 unsigned long gpa,
207                                 struct kvm_memory_slot *memslot,
208                                 bool writing, bool kvm_ro,
209                                 pte_t *inserted_pte, unsigned int *levelp);
210 extern int kvmppc_init_vm_radix(struct kvm *kvm);
211 extern void kvmppc_free_radix(struct kvm *kvm);
212 extern void kvmppc_free_pgtable_radix(struct kvm *kvm, pgd_t *pgd,
213                                       unsigned int lpid);
214 extern int kvmppc_radix_init(void);
215 extern void kvmppc_radix_exit(void);
216 extern int kvm_unmap_radix(struct kvm *kvm, struct kvm_memory_slot *memslot,
217                         unsigned long gfn);
218 extern void kvmppc_unmap_pte(struct kvm *kvm, pte_t *pte,
219                              unsigned long gpa, unsigned int shift,
220                              struct kvm_memory_slot *memslot,
221                              unsigned int lpid);
222 extern int kvm_age_radix(struct kvm *kvm, struct kvm_memory_slot *memslot,
223                         unsigned long gfn);
224 extern int kvm_test_age_radix(struct kvm *kvm, struct kvm_memory_slot *memslot,
225                         unsigned long gfn);
226 extern long kvmppc_hv_get_dirty_log_radix(struct kvm *kvm,
227                         struct kvm_memory_slot *memslot, unsigned long *map);
228 extern int kvmhv_get_rmmu_info(struct kvm *kvm, struct kvm_ppc_rmmu_info *info);
229 
230 /* XXX remove this export when load_last_inst() is generic */
231 extern int kvmppc_ld(struct kvm_vcpu *vcpu, ulong *eaddr, int size, void *ptr, bool data);
232 extern void kvmppc_book3s_queue_irqprio(struct kvm_vcpu *vcpu, unsigned int vec);
233 extern void kvmppc_book3s_dequeue_irqprio(struct kvm_vcpu *vcpu,
234                                           unsigned int vec);
235 extern void kvmppc_inject_interrupt(struct kvm_vcpu *vcpu, int vec, u64 flags);
236 extern void kvmppc_trigger_fac_interrupt(struct kvm_vcpu *vcpu, ulong fac);
237 extern void kvmppc_set_bat(struct kvm_vcpu *vcpu, struct kvmppc_bat *bat,
238                            bool upper, u32 val);
239 extern void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr);
240 extern int kvmppc_emulate_paired_single(struct kvm_run *run, struct kvm_vcpu *vcpu);
241 extern kvm_pfn_t kvmppc_gpa_to_pfn(struct kvm_vcpu *vcpu, gpa_t gpa,
242                         bool writing, bool *writable);
243 extern void kvmppc_add_revmap_chain(struct kvm *kvm, struct revmap_entry *rev,
244                         unsigned long *rmap, long pte_index, int realmode);
245 extern void kvmppc_update_dirty_map(struct kvm_memory_slot *memslot,
246                         unsigned long gfn, unsigned long psize);
247 extern void kvmppc_invalidate_hpte(struct kvm *kvm, __be64 *hptep,
248                         unsigned long pte_index);
249 void kvmppc_clear_ref_hpte(struct kvm *kvm, __be64 *hptep,
250                         unsigned long pte_index);
251 extern void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long addr,
252                         unsigned long *nb_ret);
253 extern void kvmppc_unpin_guest_page(struct kvm *kvm, void *addr,
254                         unsigned long gpa, bool dirty);
255 extern long kvmppc_do_h_enter(struct kvm *kvm, unsigned long flags,
256                         long pte_index, unsigned long pteh, unsigned long ptel,
257                         pgd_t *pgdir, bool realmode, unsigned long *idx_ret);
258 extern long kvmppc_do_h_remove(struct kvm *kvm, unsigned long flags,
259                         unsigned long pte_index, unsigned long avpn,
260                         unsigned long *hpret);
261 extern long kvmppc_hv_get_dirty_log_hpt(struct kvm *kvm,
262                         struct kvm_memory_slot *memslot, unsigned long *map);
263 extern void kvmppc_harvest_vpa_dirty(struct kvmppc_vpa *vpa,
264                         struct kvm_memory_slot *memslot,
265                         unsigned long *map);
266 extern void kvmppc_update_lpcr(struct kvm *kvm, unsigned long lpcr,
267                         unsigned long mask);
268 extern void kvmppc_set_fscr(struct kvm_vcpu *vcpu, u64 fscr);
269 
270 extern int kvmhv_p9_tm_emulation_early(struct kvm_vcpu *vcpu);
271 extern int kvmhv_p9_tm_emulation(struct kvm_vcpu *vcpu);
272 extern void kvmhv_emulate_tm_rollback(struct kvm_vcpu *vcpu);
273 
274 extern void kvmppc_entry_trampoline(void);
275 extern void kvmppc_hv_entry_trampoline(void);
276 extern u32 kvmppc_alignment_dsisr(struct kvm_vcpu *vcpu, unsigned int inst);
277 extern ulong kvmppc_alignment_dar(struct kvm_vcpu *vcpu, unsigned int inst);
278 extern int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd);
279 extern void kvmppc_pr_init_default_hcalls(struct kvm *kvm);
280 extern int kvmppc_hcall_impl_pr(unsigned long cmd);
281 extern int kvmppc_hcall_impl_hv_realmode(unsigned long cmd);
282 extern void kvmppc_copy_to_svcpu(struct kvm_vcpu *vcpu);
283 extern void kvmppc_copy_from_svcpu(struct kvm_vcpu *vcpu);
284 
285 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
286 void kvmppc_save_tm_pr(struct kvm_vcpu *vcpu);
287 void kvmppc_restore_tm_pr(struct kvm_vcpu *vcpu);
288 void kvmppc_save_tm_sprs(struct kvm_vcpu *vcpu);
289 void kvmppc_restore_tm_sprs(struct kvm_vcpu *vcpu);
290 #else
291 static inline void kvmppc_save_tm_pr(struct kvm_vcpu *vcpu) {}
292 static inline void kvmppc_restore_tm_pr(struct kvm_vcpu *vcpu) {}
293 static inline void kvmppc_save_tm_sprs(struct kvm_vcpu *vcpu) {}
294 static inline void kvmppc_restore_tm_sprs(struct kvm_vcpu *vcpu) {}
295 #endif
296 
297 long kvmhv_nested_init(void);
298 void kvmhv_nested_exit(void);
299 void kvmhv_vm_nested_init(struct kvm *kvm);
300 long kvmhv_set_partition_table(struct kvm_vcpu *vcpu);
301 void kvmhv_set_ptbl_entry(unsigned int lpid, u64 dw0, u64 dw1);
302 void kvmhv_release_all_nested(struct kvm *kvm);
303 long kvmhv_enter_nested_guest(struct kvm_vcpu *vcpu);
304 long kvmhv_do_nested_tlbie(struct kvm_vcpu *vcpu);
305 int kvmhv_run_single_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu,
306                           u64 time_limit, unsigned long lpcr);
307 void kvmhv_save_hv_regs(struct kvm_vcpu *vcpu, struct hv_guest_state *hr);
308 void kvmhv_restore_hv_return_state(struct kvm_vcpu *vcpu,
309                                    struct hv_guest_state *hr);
310 long int kvmhv_nested_page_fault(struct kvm_vcpu *vcpu);
311 
312 void kvmppc_giveup_fac(struct kvm_vcpu *vcpu, ulong fac);
313 
314 extern int kvm_irq_bypass;
315 
316 static inline struct kvmppc_vcpu_book3s *to_book3s(struct kvm_vcpu *vcpu)
317 {
318         return vcpu->arch.book3s;
319 }
320 
321 /* Also add subarch specific defines */
322 
323 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER
324 #include <asm/kvm_book3s_32.h>
325 #endif
326 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
327 #include <asm/kvm_book3s_64.h>
328 #endif
329 
330 static inline void kvmppc_set_gpr(struct kvm_vcpu *vcpu, int num, ulong val)
331 {
332         vcpu->arch.regs.gpr[num] = val;
333 }
334 
335 static inline ulong kvmppc_get_gpr(struct kvm_vcpu *vcpu, int num)
336 {
337         return vcpu->arch.regs.gpr[num];
338 }
339 
340 static inline void kvmppc_set_cr(struct kvm_vcpu *vcpu, u32 val)
341 {
342         vcpu->arch.regs.ccr = val;
343 }
344 
345 static inline u32 kvmppc_get_cr(struct kvm_vcpu *vcpu)
346 {
347         return vcpu->arch.regs.ccr;
348 }
349 
350 static inline void kvmppc_set_xer(struct kvm_vcpu *vcpu, ulong val)
351 {
352         vcpu->arch.regs.xer = val;
353 }
354 
355 static inline ulong kvmppc_get_xer(struct kvm_vcpu *vcpu)
356 {
357         return vcpu->arch.regs.xer;
358 }
359 
360 static inline void kvmppc_set_ctr(struct kvm_vcpu *vcpu, ulong val)
361 {
362         vcpu->arch.regs.ctr = val;
363 }
364 
365 static inline ulong kvmppc_get_ctr(struct kvm_vcpu *vcpu)
366 {
367         return vcpu->arch.regs.ctr;
368 }
369 
370 static inline void kvmppc_set_lr(struct kvm_vcpu *vcpu, ulong val)
371 {
372         vcpu->arch.regs.link = val;
373 }
374 
375 static inline ulong kvmppc_get_lr(struct kvm_vcpu *vcpu)
376 {
377         return vcpu->arch.regs.link;
378 }
379 
380 static inline void kvmppc_set_pc(struct kvm_vcpu *vcpu, ulong val)
381 {
382         vcpu->arch.regs.nip = val;
383 }
384 
385 static inline ulong kvmppc_get_pc(struct kvm_vcpu *vcpu)
386 {
387         return vcpu->arch.regs.nip;
388 }
389 
390 static inline u64 kvmppc_get_msr(struct kvm_vcpu *vcpu);
391 static inline bool kvmppc_need_byteswap(struct kvm_vcpu *vcpu)
392 {
393         return (kvmppc_get_msr(vcpu) & MSR_LE) != (MSR_KERNEL & MSR_LE);
394 }
395 
396 static inline ulong kvmppc_get_fault_dar(struct kvm_vcpu *vcpu)
397 {
398         return vcpu->arch.fault_dar;
399 }
400 
401 static inline bool is_kvmppc_resume_guest(int r)
402 {
403         return (r == RESUME_GUEST || r == RESUME_GUEST_NV);
404 }
405 
406 static inline bool is_kvmppc_hv_enabled(struct kvm *kvm);
407 static inline bool kvmppc_supports_magic_page(struct kvm_vcpu *vcpu)
408 {
409         /* Only PR KVM supports the magic page */
410         return !is_kvmppc_hv_enabled(vcpu->kvm);
411 }
412 
413 extern int kvmppc_h_logical_ci_load(struct kvm_vcpu *vcpu);
414 extern int kvmppc_h_logical_ci_store(struct kvm_vcpu *vcpu);
415 
416 /* Magic register values loaded into r3 and r4 before the 'sc' assembly
417  * instruction for the OSI hypercalls */
418 #define OSI_SC_MAGIC_R3                 0x113724FA
419 #define OSI_SC_MAGIC_R4                 0x77810F9B
420 
421 #define INS_DCBZ                        0x7c0007ec
422 /* TO = 31 for unconditional trap */
423 #define INS_TW                          0x7fe00008
424 
425 #define SPLIT_HACK_MASK                 0xff000000
426 #define SPLIT_HACK_OFFS                 0xfb000000
427 
428 /*
429  * This packs a VCPU ID from the [0..KVM_MAX_VCPU_ID) space down to the
430  * [0..KVM_MAX_VCPUS) space, using knowledge of the guest's core stride
431  * (but not its actual threading mode, which is not available) to avoid
432  * collisions.
433  *
434  * The implementation leaves VCPU IDs from the range [0..KVM_MAX_VCPUS) (block
435  * 0) unchanged: if the guest is filling each VCORE completely then it will be
436  * using consecutive IDs and it will fill the space without any packing.
437  *
438  * For higher VCPU IDs, the packed ID is based on the VCPU ID modulo
439  * KVM_MAX_VCPUS (effectively masking off the top bits) and then an offset is
440  * added to avoid collisions.
441  *
442  * VCPU IDs in the range [KVM_MAX_VCPUS..(KVM_MAX_VCPUS*2)) (block 1) are only
443  * possible if the guest is leaving at least 1/2 of each VCORE empty, so IDs
444  * can be safely packed into the second half of each VCORE by adding an offset
445  * of (stride / 2).
446  *
447  * Similarly, if VCPU IDs in the range [(KVM_MAX_VCPUS*2)..(KVM_MAX_VCPUS*4))
448  * (blocks 2 and 3) are seen, the guest must be leaving at least 3/4 of each
449  * VCORE empty so packed IDs can be offset by (stride / 4) and (stride * 3 / 4).
450  *
451  * Finally, VCPU IDs from blocks 5..7 will only be seen if the guest is using a
452  * stride of 8 and 1 thread per core so the remaining offsets of 1, 5, 3 and 7
453  * must be free to use.
454  *
455  * (The offsets for each block are stored in block_offsets[], indexed by the
456  * block number if the stride is 8. For cases where the guest's stride is less
457  * than 8, we can re-use the block_offsets array by multiplying the block
458  * number by (MAX_SMT_THREADS / stride) to reach the correct entry.)
459  */
460 static inline u32 kvmppc_pack_vcpu_id(struct kvm *kvm, u32 id)
461 {
462         const int block_offsets[MAX_SMT_THREADS] = {0, 4, 2, 6, 1, 5, 3, 7};
463         int stride = kvm->arch.emul_smt_mode;
464         int block = (id / KVM_MAX_VCPUS) * (MAX_SMT_THREADS / stride);
465         u32 packed_id;
466 
467         if (WARN_ONCE(block >= MAX_SMT_THREADS, "VCPU ID too large to pack"))
468                 return 0;
469         packed_id = (id % KVM_MAX_VCPUS) + block_offsets[block];
470         if (WARN_ONCE(packed_id >= KVM_MAX_VCPUS, "VCPU ID packing failed"))
471                 return 0;
472         return packed_id;
473 }
474 
475 #endif /* __ASM_KVM_BOOK3S_H__ */
476 

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