1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 *
4 * Copyright SUSE Linux Products GmbH 2009
5 *
6 * Authors: Alexander Graf <agraf@suse.de>
7 */
8
9 #ifndef __ASM_KVM_BOOK3S_H__
10 #define __ASM_KVM_BOOK3S_H__
11
12 #include <linux/types.h>
13 #include <linux/kvm_host.h>
14 #include <asm/kvm_book3s_asm.h>
15
16 struct kvmppc_bat {
17 u64 raw;
18 u32 bepi;
19 u32 bepi_mask;
20 u32 brpn;
21 u8 wimg;
22 u8 pp;
23 bool vs : 1;
24 bool vp : 1;
25 };
26
27 struct kvmppc_sid_map {
28 u64 guest_vsid;
29 u64 guest_esid;
30 u64 host_vsid;
31 bool valid : 1;
32 };
33
34 #define SID_MAP_BITS 9
35 #define SID_MAP_NUM (1 << SID_MAP_BITS)
36 #define SID_MAP_MASK (SID_MAP_NUM - 1)
37
38 #ifdef CONFIG_PPC_BOOK3S_64
39 #define SID_CONTEXTS 1
40 #else
41 #define SID_CONTEXTS 128
42 #define VSID_POOL_SIZE (SID_CONTEXTS * 16)
43 #endif
44
45 struct hpte_cache {
46 struct hlist_node list_pte;
47 struct hlist_node list_pte_long;
48 struct hlist_node list_vpte;
49 struct hlist_node list_vpte_long;
50 #ifdef CONFIG_PPC_BOOK3S_64
51 struct hlist_node list_vpte_64k;
52 #endif
53 struct rcu_head rcu_head;
54 u64 host_vpn;
55 u64 pfn;
56 ulong slot;
57 struct kvmppc_pte pte;
58 int pagesize;
59 };
60
61 /*
62 * Struct for a virtual core.
63 * Note: entry_exit_map combines a bitmap of threads that have entered
64 * in the bottom 8 bits and a bitmap of threads that have exited in the
65 * next 8 bits. This is so that we can atomically set the entry bit
66 * iff the exit map is 0 without taking a lock.
67 */
68 struct kvmppc_vcore {
69 int n_runnable;
70 int num_threads;
71 int entry_exit_map;
72 int napping_threads;
73 int first_vcpuid;
74 u16 pcpu;
75 u16 last_cpu;
76 u8 vcore_state;
77 u8 in_guest;
78 struct kvm_vcpu *runnable_threads[MAX_SMT_THREADS];
79 struct list_head preempt_list;
80 spinlock_t lock;
81 struct rcuwait wait;
82 spinlock_t stoltb_lock; /* protects stolen_tb and preempt_tb */
83 u64 stolen_tb;
84 u64 preempt_tb;
85 struct kvm_vcpu *runner;
86 struct kvm *kvm;
87 u64 tb_offset; /* guest timebase - host timebase */
88 u64 tb_offset_applied; /* timebase offset currently in force */
89 ulong lpcr;
90 u32 arch_compat;
91 ulong pcr;
92 ulong dpdes; /* doorbell state (POWER8) */
93 ulong vtb; /* virtual timebase */
94 ulong conferring_threads;
95 unsigned int halt_poll_ns;
96 atomic_t online_count;
97 };
98
99 struct kvmppc_vcpu_book3s {
100 struct kvmppc_sid_map sid_map[SID_MAP_NUM];
101 struct {
102 u64 esid;
103 u64 vsid;
104 } slb_shadow[64];
105 u8 slb_shadow_max;
106 struct kvmppc_bat ibat[8];
107 struct kvmppc_bat dbat[8];
108 u64 hid[6];
109 u64 gqr[8];
110 u64 sdr1;
111 u64 hior;
112 u64 msr_mask;
113 u64 vtb;
114 #ifdef CONFIG_PPC_BOOK3S_32
115 u32 vsid_pool[VSID_POOL_SIZE];
116 u32 vsid_next;
117 #else
118 u64 proto_vsid_first;
119 u64 proto_vsid_max;
120 u64 proto_vsid_next;
121 #endif
122 int context_id[SID_CONTEXTS];
123
124 bool hior_explicit; /* HIOR is set by ioctl, not PVR */
125
126 struct hlist_head hpte_hash_pte[HPTEG_HASH_NUM_PTE];
127 struct hlist_head hpte_hash_pte_long[HPTEG_HASH_NUM_PTE_LONG];
128 struct hlist_head hpte_hash_vpte[HPTEG_HASH_NUM_VPTE];
129 struct hlist_head hpte_hash_vpte_long[HPTEG_HASH_NUM_VPTE_LONG];
130 #ifdef CONFIG_PPC_BOOK3S_64
131 struct hlist_head hpte_hash_vpte_64k[HPTEG_HASH_NUM_VPTE_64K];
132 #endif
133 int hpte_cache_count;
134 spinlock_t mmu_lock;
135 };
136
137 #define VSID_REAL 0x07ffffffffc00000ULL
138 #define VSID_BAT 0x07ffffffffb00000ULL
139 #define VSID_64K 0x0800000000000000ULL
140 #define VSID_1T 0x1000000000000000ULL
141 #define VSID_REAL_DR 0x2000000000000000ULL
142 #define VSID_REAL_IR 0x4000000000000000ULL
143 #define VSID_PR 0x8000000000000000ULL
144
145 extern void kvmppc_mmu_pte_flush(struct kvm_vcpu *vcpu, ulong ea, ulong ea_mask);
146 extern void kvmppc_mmu_pte_vflush(struct kvm_vcpu *vcpu, u64 vp, u64 vp_mask);
147 extern void kvmppc_mmu_pte_pflush(struct kvm_vcpu *vcpu, ulong pa_start, ulong pa_end);
148 extern void kvmppc_set_msr(struct kvm_vcpu *vcpu, u64 new_msr);
149 extern void kvmppc_mmu_book3s_64_init(struct kvm_vcpu *vcpu);
150 extern void kvmppc_mmu_book3s_32_init(struct kvm_vcpu *vcpu);
151 extern void kvmppc_mmu_book3s_hv_init(struct kvm_vcpu *vcpu);
152 extern int kvmppc_mmu_map_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte,
153 bool iswrite);
154 extern void kvmppc_mmu_unmap_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte);
155 extern int kvmppc_mmu_map_segment(struct kvm_vcpu *vcpu, ulong eaddr);
156 extern void kvmppc_mmu_flush_segment(struct kvm_vcpu *vcpu, ulong eaddr, ulong seg_size);
157 extern void kvmppc_mmu_flush_segments(struct kvm_vcpu *vcpu);
158 extern int kvmppc_book3s_hv_page_fault(struct kvm_vcpu *vcpu,
159 unsigned long addr, unsigned long status);
160 extern long kvmppc_hv_find_lock_hpte(struct kvm *kvm, gva_t eaddr,
161 unsigned long slb_v, unsigned long valid);
162 extern int kvmppc_hv_emulate_mmio(struct kvm_vcpu *vcpu,
163 unsigned long gpa, gva_t ea, int is_store);
164
165 extern void kvmppc_mmu_hpte_cache_map(struct kvm_vcpu *vcpu, struct hpte_cache *pte);
166 extern struct hpte_cache *kvmppc_mmu_hpte_cache_next(struct kvm_vcpu *vcpu);
167 extern void kvmppc_mmu_hpte_cache_free(struct hpte_cache *pte);
168 extern void kvmppc_mmu_hpte_destroy(struct kvm_vcpu *vcpu);
169 extern int kvmppc_mmu_hpte_init(struct kvm_vcpu *vcpu);
170 extern void kvmppc_mmu_invalidate_pte(struct kvm_vcpu *vcpu, struct hpte_cache *pte);
171 extern int kvmppc_mmu_hpte_sysinit(void);
172 extern void kvmppc_mmu_hpte_sysexit(void);
173 extern int kvmppc_mmu_hv_init(void);
174 extern int kvmppc_book3s_hcall_implemented(struct kvm *kvm, unsigned long hc);
175
176 extern int kvmppc_book3s_radix_page_fault(struct kvm_vcpu *vcpu,
177 unsigned long ea, unsigned long dsisr);
178 extern unsigned long __kvmhv_copy_tofrom_guest_radix(int lpid, int pid,
179 gva_t eaddr, void *to, void *from,
180 unsigned long n);
181 extern long kvmhv_copy_from_guest_radix(struct kvm_vcpu *vcpu, gva_t eaddr,
182 void *to, unsigned long n);
183 extern long kvmhv_copy_to_guest_radix(struct kvm_vcpu *vcpu, gva_t eaddr,
184 void *from, unsigned long n);
185 extern int kvmppc_mmu_walk_radix_tree(struct kvm_vcpu *vcpu, gva_t eaddr,
186 struct kvmppc_pte *gpte, u64 root,
187 u64 *pte_ret_p);
188 extern int kvmppc_mmu_radix_translate_table(struct kvm_vcpu *vcpu, gva_t eaddr,
189 struct kvmppc_pte *gpte, u64 table,
190 int table_index, u64 *pte_ret_p);
191 extern int kvmppc_mmu_radix_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
192 struct kvmppc_pte *gpte, bool data, bool iswrite);
193 extern void kvmppc_radix_tlbie_page(struct kvm *kvm, unsigned long addr,
194 unsigned int pshift, unsigned int lpid);
195 extern void kvmppc_unmap_pte(struct kvm *kvm, pte_t *pte, unsigned long gpa,
196 unsigned int shift,
197 const struct kvm_memory_slot *memslot,
198 unsigned int lpid);
199 extern bool kvmppc_hv_handle_set_rc(struct kvm *kvm, bool nested,
200 bool writing, unsigned long gpa,
201 unsigned int lpid);
202 extern int kvmppc_book3s_instantiate_page(struct kvm_vcpu *vcpu,
203 unsigned long gpa,
204 struct kvm_memory_slot *memslot,
205 bool writing, bool kvm_ro,
206 pte_t *inserted_pte, unsigned int *levelp);
207 extern int kvmppc_init_vm_radix(struct kvm *kvm);
208 extern void kvmppc_free_radix(struct kvm *kvm);
209 extern void kvmppc_free_pgtable_radix(struct kvm *kvm, pgd_t *pgd,
210 unsigned int lpid);
211 extern int kvmppc_radix_init(void);
212 extern void kvmppc_radix_exit(void);
213 extern int kvm_unmap_radix(struct kvm *kvm, struct kvm_memory_slot *memslot,
214 unsigned long gfn);
215 extern int kvm_age_radix(struct kvm *kvm, struct kvm_memory_slot *memslot,
216 unsigned long gfn);
217 extern int kvm_test_age_radix(struct kvm *kvm, struct kvm_memory_slot *memslot,
218 unsigned long gfn);
219 extern long kvmppc_hv_get_dirty_log_radix(struct kvm *kvm,
220 struct kvm_memory_slot *memslot, unsigned long *map);
221 extern void kvmppc_radix_flush_memslot(struct kvm *kvm,
222 const struct kvm_memory_slot *memslot);
223 extern int kvmhv_get_rmmu_info(struct kvm *kvm, struct kvm_ppc_rmmu_info *info);
224
225 /* XXX remove this export when load_last_inst() is generic */
226 extern int kvmppc_ld(struct kvm_vcpu *vcpu, ulong *eaddr, int size, void *ptr, bool data);
227 extern void kvmppc_book3s_queue_irqprio(struct kvm_vcpu *vcpu, unsigned int vec);
228 extern void kvmppc_book3s_dequeue_irqprio(struct kvm_vcpu *vcpu,
229 unsigned int vec);
230 extern void kvmppc_inject_interrupt(struct kvm_vcpu *vcpu, int vec, u64 flags);
231 extern void kvmppc_trigger_fac_interrupt(struct kvm_vcpu *vcpu, ulong fac);
232 extern void kvmppc_set_bat(struct kvm_vcpu *vcpu, struct kvmppc_bat *bat,
233 bool upper, u32 val);
234 extern void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr);
235 extern int kvmppc_emulate_paired_single(struct kvm_vcpu *vcpu);
236 extern kvm_pfn_t kvmppc_gpa_to_pfn(struct kvm_vcpu *vcpu, gpa_t gpa,
237 bool writing, bool *writable);
238 extern void kvmppc_add_revmap_chain(struct kvm *kvm, struct revmap_entry *rev,
239 unsigned long *rmap, long pte_index, int realmode);
240 extern void kvmppc_update_dirty_map(const struct kvm_memory_slot *memslot,
241 unsigned long gfn, unsigned long psize);
242 extern void kvmppc_invalidate_hpte(struct kvm *kvm, __be64 *hptep,
243 unsigned long pte_index);
244 void kvmppc_clear_ref_hpte(struct kvm *kvm, __be64 *hptep,
245 unsigned long pte_index);
246 extern void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long addr,
247 unsigned long *nb_ret);
248 extern void kvmppc_unpin_guest_page(struct kvm *kvm, void *addr,
249 unsigned long gpa, bool dirty);
250 extern long kvmppc_do_h_enter(struct kvm *kvm, unsigned long flags,
251 long pte_index, unsigned long pteh, unsigned long ptel,
252 pgd_t *pgdir, bool realmode, unsigned long *idx_ret);
253 extern long kvmppc_do_h_remove(struct kvm *kvm, unsigned long flags,
254 unsigned long pte_index, unsigned long avpn,
255 unsigned long *hpret);
256 extern long kvmppc_hv_get_dirty_log_hpt(struct kvm *kvm,
257 struct kvm_memory_slot *memslot, unsigned long *map);
258 extern void kvmppc_harvest_vpa_dirty(struct kvmppc_vpa *vpa,
259 struct kvm_memory_slot *memslot,
260 unsigned long *map);
261 extern void kvmppc_update_lpcr(struct kvm *kvm, unsigned long lpcr,
262 unsigned long mask);
263 extern void kvmppc_set_fscr(struct kvm_vcpu *vcpu, u64 fscr);
264
265 extern int kvmhv_p9_tm_emulation_early(struct kvm_vcpu *vcpu);
266 extern int kvmhv_p9_tm_emulation(struct kvm_vcpu *vcpu);
267 extern void kvmhv_emulate_tm_rollback(struct kvm_vcpu *vcpu);
268
269 extern void kvmppc_entry_trampoline(void);
270 extern void kvmppc_hv_entry_trampoline(void);
271 extern u32 kvmppc_alignment_dsisr(struct kvm_vcpu *vcpu, unsigned int inst);
272 extern ulong kvmppc_alignment_dar(struct kvm_vcpu *vcpu, unsigned int inst);
273 extern int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd);
274 extern void kvmppc_pr_init_default_hcalls(struct kvm *kvm);
275 extern int kvmppc_hcall_impl_pr(unsigned long cmd);
276 extern int kvmppc_hcall_impl_hv_realmode(unsigned long cmd);
277 extern void kvmppc_copy_to_svcpu(struct kvm_vcpu *vcpu);
278 extern void kvmppc_copy_from_svcpu(struct kvm_vcpu *vcpu);
279
280 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
281 void kvmppc_save_tm_pr(struct kvm_vcpu *vcpu);
282 void kvmppc_restore_tm_pr(struct kvm_vcpu *vcpu);
283 void kvmppc_save_tm_sprs(struct kvm_vcpu *vcpu);
284 void kvmppc_restore_tm_sprs(struct kvm_vcpu *vcpu);
285 #else
kvmppc_save_tm_pr(struct kvm_vcpu * vcpu)286 static inline void kvmppc_save_tm_pr(struct kvm_vcpu *vcpu) {}
kvmppc_restore_tm_pr(struct kvm_vcpu * vcpu)287 static inline void kvmppc_restore_tm_pr(struct kvm_vcpu *vcpu) {}
kvmppc_save_tm_sprs(struct kvm_vcpu * vcpu)288 static inline void kvmppc_save_tm_sprs(struct kvm_vcpu *vcpu) {}
kvmppc_restore_tm_sprs(struct kvm_vcpu * vcpu)289 static inline void kvmppc_restore_tm_sprs(struct kvm_vcpu *vcpu) {}
290 #endif
291
292 long kvmhv_nested_init(void);
293 void kvmhv_nested_exit(void);
294 void kvmhv_vm_nested_init(struct kvm *kvm);
295 long kvmhv_set_partition_table(struct kvm_vcpu *vcpu);
296 long kvmhv_copy_tofrom_guest_nested(struct kvm_vcpu *vcpu);
297 void kvmhv_set_ptbl_entry(unsigned int lpid, u64 dw0, u64 dw1);
298 void kvmhv_release_all_nested(struct kvm *kvm);
299 long kvmhv_enter_nested_guest(struct kvm_vcpu *vcpu);
300 long kvmhv_do_nested_tlbie(struct kvm_vcpu *vcpu);
301 int kvmhv_run_single_vcpu(struct kvm_vcpu *vcpu,
302 u64 time_limit, unsigned long lpcr);
303 void kvmhv_save_hv_regs(struct kvm_vcpu *vcpu, struct hv_guest_state *hr);
304 void kvmhv_restore_hv_return_state(struct kvm_vcpu *vcpu,
305 struct hv_guest_state *hr);
306 long int kvmhv_nested_page_fault(struct kvm_vcpu *vcpu);
307
308 void kvmppc_giveup_fac(struct kvm_vcpu *vcpu, ulong fac);
309
310 extern int kvm_irq_bypass;
311
to_book3s(struct kvm_vcpu * vcpu)312 static inline struct kvmppc_vcpu_book3s *to_book3s(struct kvm_vcpu *vcpu)
313 {
314 return vcpu->arch.book3s;
315 }
316
317 /* Also add subarch specific defines */
318
319 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER
320 #include <asm/kvm_book3s_32.h>
321 #endif
322 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
323 #include <asm/kvm_book3s_64.h>
324 #endif
325
kvmppc_set_gpr(struct kvm_vcpu * vcpu,int num,ulong val)326 static inline void kvmppc_set_gpr(struct kvm_vcpu *vcpu, int num, ulong val)
327 {
328 vcpu->arch.regs.gpr[num] = val;
329 }
330
kvmppc_get_gpr(struct kvm_vcpu * vcpu,int num)331 static inline ulong kvmppc_get_gpr(struct kvm_vcpu *vcpu, int num)
332 {
333 return vcpu->arch.regs.gpr[num];
334 }
335
kvmppc_set_cr(struct kvm_vcpu * vcpu,u32 val)336 static inline void kvmppc_set_cr(struct kvm_vcpu *vcpu, u32 val)
337 {
338 vcpu->arch.regs.ccr = val;
339 }
340
kvmppc_get_cr(struct kvm_vcpu * vcpu)341 static inline u32 kvmppc_get_cr(struct kvm_vcpu *vcpu)
342 {
343 return vcpu->arch.regs.ccr;
344 }
345
kvmppc_set_xer(struct kvm_vcpu * vcpu,ulong val)346 static inline void kvmppc_set_xer(struct kvm_vcpu *vcpu, ulong val)
347 {
348 vcpu->arch.regs.xer = val;
349 }
350
kvmppc_get_xer(struct kvm_vcpu * vcpu)351 static inline ulong kvmppc_get_xer(struct kvm_vcpu *vcpu)
352 {
353 return vcpu->arch.regs.xer;
354 }
355
kvmppc_set_ctr(struct kvm_vcpu * vcpu,ulong val)356 static inline void kvmppc_set_ctr(struct kvm_vcpu *vcpu, ulong val)
357 {
358 vcpu->arch.regs.ctr = val;
359 }
360
kvmppc_get_ctr(struct kvm_vcpu * vcpu)361 static inline ulong kvmppc_get_ctr(struct kvm_vcpu *vcpu)
362 {
363 return vcpu->arch.regs.ctr;
364 }
365
kvmppc_set_lr(struct kvm_vcpu * vcpu,ulong val)366 static inline void kvmppc_set_lr(struct kvm_vcpu *vcpu, ulong val)
367 {
368 vcpu->arch.regs.link = val;
369 }
370
kvmppc_get_lr(struct kvm_vcpu * vcpu)371 static inline ulong kvmppc_get_lr(struct kvm_vcpu *vcpu)
372 {
373 return vcpu->arch.regs.link;
374 }
375
kvmppc_set_pc(struct kvm_vcpu * vcpu,ulong val)376 static inline void kvmppc_set_pc(struct kvm_vcpu *vcpu, ulong val)
377 {
378 vcpu->arch.regs.nip = val;
379 }
380
kvmppc_get_pc(struct kvm_vcpu * vcpu)381 static inline ulong kvmppc_get_pc(struct kvm_vcpu *vcpu)
382 {
383 return vcpu->arch.regs.nip;
384 }
385
386 static inline u64 kvmppc_get_msr(struct kvm_vcpu *vcpu);
kvmppc_need_byteswap(struct kvm_vcpu * vcpu)387 static inline bool kvmppc_need_byteswap(struct kvm_vcpu *vcpu)
388 {
389 return (kvmppc_get_msr(vcpu) & MSR_LE) != (MSR_KERNEL & MSR_LE);
390 }
391
kvmppc_get_fault_dar(struct kvm_vcpu * vcpu)392 static inline ulong kvmppc_get_fault_dar(struct kvm_vcpu *vcpu)
393 {
394 return vcpu->arch.fault_dar;
395 }
396
is_kvmppc_resume_guest(int r)397 static inline bool is_kvmppc_resume_guest(int r)
398 {
399 return (r == RESUME_GUEST || r == RESUME_GUEST_NV);
400 }
401
402 static inline bool is_kvmppc_hv_enabled(struct kvm *kvm);
kvmppc_supports_magic_page(struct kvm_vcpu * vcpu)403 static inline bool kvmppc_supports_magic_page(struct kvm_vcpu *vcpu)
404 {
405 /* Only PR KVM supports the magic page */
406 return !is_kvmppc_hv_enabled(vcpu->kvm);
407 }
408
409 extern int kvmppc_h_logical_ci_load(struct kvm_vcpu *vcpu);
410 extern int kvmppc_h_logical_ci_store(struct kvm_vcpu *vcpu);
411
412 /* Magic register values loaded into r3 and r4 before the 'sc' assembly
413 * instruction for the OSI hypercalls */
414 #define OSI_SC_MAGIC_R3 0x113724FA
415 #define OSI_SC_MAGIC_R4 0x77810F9B
416
417 #define INS_DCBZ 0x7c0007ec
418 /* TO = 31 for unconditional trap */
419 #define INS_TW 0x7fe00008
420
421 #define SPLIT_HACK_MASK 0xff000000
422 #define SPLIT_HACK_OFFS 0xfb000000
423
424 /*
425 * This packs a VCPU ID from the [0..KVM_MAX_VCPU_ID) space down to the
426 * [0..KVM_MAX_VCPUS) space, using knowledge of the guest's core stride
427 * (but not its actual threading mode, which is not available) to avoid
428 * collisions.
429 *
430 * The implementation leaves VCPU IDs from the range [0..KVM_MAX_VCPUS) (block
431 * 0) unchanged: if the guest is filling each VCORE completely then it will be
432 * using consecutive IDs and it will fill the space without any packing.
433 *
434 * For higher VCPU IDs, the packed ID is based on the VCPU ID modulo
435 * KVM_MAX_VCPUS (effectively masking off the top bits) and then an offset is
436 * added to avoid collisions.
437 *
438 * VCPU IDs in the range [KVM_MAX_VCPUS..(KVM_MAX_VCPUS*2)) (block 1) are only
439 * possible if the guest is leaving at least 1/2 of each VCORE empty, so IDs
440 * can be safely packed into the second half of each VCORE by adding an offset
441 * of (stride / 2).
442 *
443 * Similarly, if VCPU IDs in the range [(KVM_MAX_VCPUS*2)..(KVM_MAX_VCPUS*4))
444 * (blocks 2 and 3) are seen, the guest must be leaving at least 3/4 of each
445 * VCORE empty so packed IDs can be offset by (stride / 4) and (stride * 3 / 4).
446 *
447 * Finally, VCPU IDs from blocks 5..7 will only be seen if the guest is using a
448 * stride of 8 and 1 thread per core so the remaining offsets of 1, 5, 3 and 7
449 * must be free to use.
450 *
451 * (The offsets for each block are stored in block_offsets[], indexed by the
452 * block number if the stride is 8. For cases where the guest's stride is less
453 * than 8, we can re-use the block_offsets array by multiplying the block
454 * number by (MAX_SMT_THREADS / stride) to reach the correct entry.)
455 */
kvmppc_pack_vcpu_id(struct kvm * kvm,u32 id)456 static inline u32 kvmppc_pack_vcpu_id(struct kvm *kvm, u32 id)
457 {
458 const int block_offsets[MAX_SMT_THREADS] = {0, 4, 2, 6, 1, 5, 3, 7};
459 int stride = kvm->arch.emul_smt_mode;
460 int block = (id / KVM_MAX_VCPUS) * (MAX_SMT_THREADS / stride);
461 u32 packed_id;
462
463 if (WARN_ONCE(block >= MAX_SMT_THREADS, "VCPU ID too large to pack"))
464 return 0;
465 packed_id = (id % KVM_MAX_VCPUS) + block_offsets[block];
466 if (WARN_ONCE(packed_id >= KVM_MAX_VCPUS, "VCPU ID packing failed"))
467 return 0;
468 return packed_id;
469 }
470
471 #endif /* __ASM_KVM_BOOK3S_H__ */
472
