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powerpc/mm: Fixup tlbie vs mtpidr/mtlpidr ordering issue on POWER9
[linux-2.6-block.git] / arch / powerpc / include / asm / kvm_book3s.h
CommitLineData
d94d71cb 1/* SPDX-License-Identifier: GPL-2.0-only */
4e342025 2/*
4e342025
AG		 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>
2191d657 14#include <asm/kvm_book3s_asm.h>
4e342025 15
4e342025 16struct kvmppc_bat {
e15a1137 17 u64 raw;
4e342025
AG		 18 u32 bepi;
19 u32 bepi_mask;
4e342025
AG		 20 u32 brpn;
21 u8 wimg;
22 u8 pp;
3ed9c6d2
AG		 23 bool vs : 1;
24 bool vp : 1;
4e342025
AG		 25};
26
27struct kvmppc_sid_map {
28 u64 guest_vsid;
29 u64 guest_esid;
30 u64 host_vsid;
3ed9c6d2 31 bool valid : 1;
4e342025
AG		 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
8b6db3bc
AG		 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
c4befc58
PM		 45struct 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;
a4a0f252
PM		 50#ifdef CONFIG_PPC_BOOK3S_64
51 struct hlist_node list_vpte_64k;
52#endif
c4befc58 53 struct rcu_head rcu_head;
5524a27d 54 u64 host_vpn;
c4befc58
PM		 55 u64 pfn;
56 ulong slot;
57 struct kvmppc_pte pte;
c9029c34 58 int pagesize;
c4befc58
PM		 59};
60
e64fb7e2
SJS		 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 */
68struct 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;
7b5f8272 78 struct kvm_vcpu *runnable_threads[MAX_SMT_THREADS];
e64fb7e2
SJS		 79 struct list_head preempt_list;
80 spinlock_t lock;
81 struct swait_queue_head wq;
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 */
57b8daa7 88 u64 tb_offset_applied; /* timebase offset currently in force */
e64fb7e2
SJS		 89 ulong lpcr;
90 u32 arch_compat;
91 ulong pcr;
92 ulong dpdes; /* doorbell state (POWER8) */
88b02cf9 93 ulong vtb; /* virtual timebase */
e64fb7e2 94 ulong conferring_threads;
0cda69dd 95 unsigned int halt_poll_ns;
7aa15842 96 atomic_t online_count;
e64fb7e2
SJS		 97};
98
4e342025 99struct kvmppc_vcpu_book3s {
4e342025 100 struct kvmppc_sid_map sid_map[SID_MAP_NUM];
4e342025
AG		 101 struct {
102 u64 esid;
103 u64 vsid;
104 } slb_shadow[64];
105 u8 slb_shadow_max;
4e342025
AG		 106 struct kvmppc_bat ibat[8];
107 struct kvmppc_bat dbat[8];
108 u64 hid[6];
d6d549b2 109 u64 gqr[8];
4e342025 110 u64 sdr1;
4e342025
AG		 111 u64 hior;
112 u64 msr_mask;
88b02cf9 113 u64 vtb;
8b6db3bc
AG		 114#ifdef CONFIG_PPC_BOOK3S_32
115 u32 vsid_pool[VSID_POOL_SIZE];
ffe36492 116 u32 vsid_next;
8b6db3bc 117#else
ffe36492
BH		 118 u64 proto_vsid_first;
119 u64 proto_vsid_max;
120 u64 proto_vsid_next;
8b6db3bc
AG		 121#endif
122 int context_id[SID_CONTEXTS];
c4befc58 123
1022fc3d
AG		 124 bool hior_explicit; /* HIOR is set by ioctl, not PVR */
125
c4befc58
PM		 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];
a4a0f252
PM		 130#ifdef CONFIG_PPC_BOOK3S_64
131 struct hlist_head hpte_hash_vpte_64k[HPTEG_HASH_NUM_VPTE_64K];
132#endif
c4befc58
PM		 133 int hpte_cache_count;
134 spinlock_t mmu_lock;
4e342025
AG		 135};
136
c9029c34
PM		 137#define VSID_REAL 0x07ffffffffc00000ULL
138#define VSID_BAT 0x07ffffffffb00000ULL
139#define VSID_64K 0x0800000000000000ULL
0f296829 140#define VSID_1T 0x1000000000000000ULL
f7bc74e1
AG		 141#define VSID_REAL_DR 0x2000000000000000ULL
142#define VSID_REAL_IR 0x4000000000000000ULL
5a1b419f 143#define VSID_PR 0x8000000000000000ULL
4e342025 144
af7b4d10 145extern void kvmppc_mmu_pte_flush(struct kvm_vcpu *vcpu, ulong ea, ulong ea_mask);
4e342025 146extern void kvmppc_mmu_pte_vflush(struct kvm_vcpu *vcpu, u64 vp, u64 vp_mask);
af7b4d10 147extern void kvmppc_mmu_pte_pflush(struct kvm_vcpu *vcpu, ulong pa_start, ulong pa_end);
4e342025
AG		 148extern void kvmppc_set_msr(struct kvm_vcpu *vcpu, u64 new_msr);
149extern void kvmppc_mmu_book3s_64_init(struct kvm_vcpu *vcpu);
150extern void kvmppc_mmu_book3s_32_init(struct kvm_vcpu *vcpu);
de56a948 151extern void kvmppc_mmu_book3s_hv_init(struct kvm_vcpu *vcpu);
93b159b4
PM		 152extern int kvmppc_mmu_map_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte,
153 bool iswrite);
154extern void kvmppc_mmu_unmap_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte);
4e342025 155extern int kvmppc_mmu_map_segment(struct kvm_vcpu *vcpu, ulong eaddr);
0f296829 156extern void kvmppc_mmu_flush_segment(struct kvm_vcpu *vcpu, ulong eaddr, ulong seg_size);
4e342025 157extern void kvmppc_mmu_flush_segments(struct kvm_vcpu *vcpu);
697d3899
PM		 158extern int kvmppc_book3s_hv_page_fault(struct kvm_run *run,
159 struct kvm_vcpu *vcpu, unsigned long addr,
160 unsigned long status);
161extern long kvmppc_hv_find_lock_hpte(struct kvm *kvm, gva_t eaddr,
162 unsigned long slb_v, unsigned long valid);
5a319350
PM		 163extern int kvmppc_hv_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu,
164 unsigned long gpa, gva_t ea, int is_store);
fef093be
AG		 165
166extern void kvmppc_mmu_hpte_cache_map(struct kvm_vcpu *vcpu, struct hpte_cache *pte);
167extern struct hpte_cache *kvmppc_mmu_hpte_cache_next(struct kvm_vcpu *vcpu);
d78bca72 168extern void kvmppc_mmu_hpte_cache_free(struct hpte_cache *pte);
fef093be
AG		 169extern void kvmppc_mmu_hpte_destroy(struct kvm_vcpu *vcpu);
170extern int kvmppc_mmu_hpte_init(struct kvm_vcpu *vcpu);
171extern void kvmppc_mmu_invalidate_pte(struct kvm_vcpu *vcpu, struct hpte_cache *pte);
172extern int kvmppc_mmu_hpte_sysinit(void);
173extern void kvmppc_mmu_hpte_sysexit(void);
de56a948 174extern int kvmppc_mmu_hv_init(void);
ae2113a4 175extern int kvmppc_book3s_hcall_implemented(struct kvm *kvm, unsigned long hc);
fef093be 176
5a319350
PM		 177extern int kvmppc_book3s_radix_page_fault(struct kvm_run *run,
178 struct kvm_vcpu *vcpu,
179 unsigned long ea, unsigned long dsisr);
6ff887b8
SJS		 180extern unsigned long __kvmhv_copy_tofrom_guest_radix(int lpid, int pid,
181 gva_t eaddr, void *to, void *from,
182 unsigned long n);
d7b45615
SJS		 183extern long kvmhv_copy_from_guest_radix(struct kvm_vcpu *vcpu, gva_t eaddr,
184 void *to, unsigned long n);
185extern long kvmhv_copy_to_guest_radix(struct kvm_vcpu *vcpu, gva_t eaddr,
186 void *from, unsigned long n);
fd10be25
SJS		 187extern int kvmppc_mmu_walk_radix_tree(struct kvm_vcpu *vcpu, gva_t eaddr,
188 struct kvmppc_pte *gpte, u64 root,
189 u64 *pte_ret_p);
9811c78e
SJS		 190extern int kvmppc_mmu_radix_translate_table(struct kvm_vcpu *vcpu, gva_t eaddr,
191 struct kvmppc_pte *gpte, u64 table,
192 int table_index, u64 *pte_ret_p);
9e04ba69
PM		 193extern int kvmppc_mmu_radix_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
194 struct kvmppc_pte *gpte, bool data, bool iswrite);
90165d3d
SJS		 195extern void kvmppc_radix_tlbie_page(struct kvm *kvm, unsigned long addr,
196 unsigned int pshift, unsigned int lpid);
8cf531ed 197extern void kvmppc_unmap_pte(struct kvm *kvm, pte_t *pte, unsigned long gpa,
c43c3a86
PM		 198 unsigned int shift,
199 const struct kvm_memory_slot *memslot,
8cf531ed 200 unsigned int lpid);
fd10be25
SJS		 201extern bool kvmppc_hv_handle_set_rc(struct kvm *kvm, pgd_t *pgtable,
202 bool writing, unsigned long gpa,
203 unsigned int lpid);
204extern int kvmppc_book3s_instantiate_page(struct kvm_vcpu *vcpu,
205 unsigned long gpa,
206 struct kvm_memory_slot *memslot,
207 bool writing, bool kvm_ro,
208 pte_t *inserted_pte, unsigned int *levelp);
8cf4ecc0 209extern int kvmppc_init_vm_radix(struct kvm *kvm);
5a319350 210extern void kvmppc_free_radix(struct kvm *kvm);
fd10be25
SJS		 211extern void kvmppc_free_pgtable_radix(struct kvm *kvm, pgd_t *pgd,
212 unsigned int lpid);
5a319350
PM		 213extern int kvmppc_radix_init(void);
214extern void kvmppc_radix_exit(void);
01756099
PM		 215extern int kvm_unmap_radix(struct kvm *kvm, struct kvm_memory_slot *memslot,
216 unsigned long gfn);
217extern int kvm_age_radix(struct kvm *kvm, struct kvm_memory_slot *memslot,
218 unsigned long gfn);
219extern int kvm_test_age_radix(struct kvm *kvm, struct kvm_memory_slot *memslot,
220 unsigned long gfn);
8f7b79b8
PM		 221extern long kvmppc_hv_get_dirty_log_radix(struct kvm *kvm,
222 struct kvm_memory_slot *memslot, unsigned long *map);
5af3e9d0
PM		 223extern void kvmppc_radix_flush_memslot(struct kvm *kvm,
224 const struct kvm_memory_slot *memslot);
8cf4ecc0 225extern int kvmhv_get_rmmu_info(struct kvm *kvm, struct kvm_ppc_rmmu_info *info);
9e04ba69 226
35c4a733 227/* XXX remove this export when load_last_inst() is generic */
5467a97d 228extern int kvmppc_ld(struct kvm_vcpu *vcpu, ulong *eaddr, int size, void *ptr, bool data);
4e342025 229extern void kvmppc_book3s_queue_irqprio(struct kvm_vcpu *vcpu, unsigned int vec);
bc5ad3f3
BH		 230extern void kvmppc_book3s_dequeue_irqprio(struct kvm_vcpu *vcpu,
231 unsigned int vec);
de56a948 232extern void kvmppc_inject_interrupt(struct kvm_vcpu *vcpu, int vec, u64 flags);
533082ae 233extern void kvmppc_trigger_fac_interrupt(struct kvm_vcpu *vcpu, ulong fac);
e15a1137
AG		 234extern void kvmppc_set_bat(struct kvm_vcpu *vcpu, struct kvmppc_bat *bat,
235 bool upper, u32 val);
aba3bd7f 236extern void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr);
831317b6 237extern int kvmppc_emulate_paired_single(struct kvm_run *run, struct kvm_vcpu *vcpu);
ba049e93
DW		 238extern kvm_pfn_t kvmppc_gpa_to_pfn(struct kvm_vcpu *vcpu, gpa_t gpa,
239 bool writing, bool *writable);
342d3db7
PM		 240extern void kvmppc_add_revmap_chain(struct kvm *kvm, struct revmap_entry *rev,
241 unsigned long *rmap, long pte_index, int realmode);
c43c3a86 242extern void kvmppc_update_dirty_map(const struct kvm_memory_slot *memslot,
e641a317 243 unsigned long gfn, unsigned long psize);
6f22bd32 244extern void kvmppc_invalidate_hpte(struct kvm *kvm, __be64 *hptep,
342d3db7 245 unsigned long pte_index);
6f22bd32 246void kvmppc_clear_ref_hpte(struct kvm *kvm, __be64 *hptep,
55514893 247 unsigned long pte_index);
93e60249
PM		 248extern void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long addr,
249 unsigned long *nb_ret);
c35635ef
PM		 250extern void kvmppc_unpin_guest_page(struct kvm *kvm, void *addr,
251 unsigned long gpa, bool dirty);
7ed661bf
PM		 252extern long kvmppc_do_h_enter(struct kvm *kvm, unsigned long flags,
253 long pte_index, unsigned long pteh, unsigned long ptel,
254 pgd_t *pgdir, bool realmode, unsigned long *idx_ret);
6b445ad4
PM		 255extern long kvmppc_do_h_remove(struct kvm *kvm, unsigned long flags,
256 unsigned long pte_index, unsigned long avpn,
257 unsigned long *hpret);
8f7b79b8 258extern long kvmppc_hv_get_dirty_log_hpt(struct kvm *kvm,
dfe49dbd 259 struct kvm_memory_slot *memslot, unsigned long *map);
8f7b79b8
PM		 260extern void kvmppc_harvest_vpa_dirty(struct kvmppc_vpa *vpa,
261 struct kvm_memory_slot *memslot,
262 unsigned long *map);
a0144e2a
PM		 263extern void kvmppc_update_lpcr(struct kvm *kvm, unsigned long lpcr,
264 unsigned long mask);
8e6afa36 265extern void kvmppc_set_fscr(struct kvm_vcpu *vcpu, u64 fscr);
4e342025 266
4bb3c7a0
PM		 267extern int kvmhv_p9_tm_emulation_early(struct kvm_vcpu *vcpu);
268extern int kvmhv_p9_tm_emulation(struct kvm_vcpu *vcpu);
269extern void kvmhv_emulate_tm_rollback(struct kvm_vcpu *vcpu);
270
02143947 271extern void kvmppc_entry_trampoline(void);
de56a948 272extern void kvmppc_hv_entry_trampoline(void);
ca7f4203
AG		 273extern u32 kvmppc_alignment_dsisr(struct kvm_vcpu *vcpu, unsigned int inst);
274extern ulong kvmppc_alignment_dar(struct kvm_vcpu *vcpu, unsigned int inst);
0254f074 275extern int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd);
699a0ea0 276extern void kvmppc_pr_init_default_hcalls(struct kvm *kvm);
ae2113a4
PM		 277extern int kvmppc_hcall_impl_pr(unsigned long cmd);
278extern int kvmppc_hcall_impl_hv_realmode(unsigned long cmd);
07ae5389
AG		 279extern void kvmppc_copy_to_svcpu(struct kvm_vcpu *vcpu);
280extern void kvmppc_copy_from_svcpu(struct kvm_vcpu *vcpu);
8d2e2fc5
SG		 281
282#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
283void kvmppc_save_tm_pr(struct kvm_vcpu *vcpu);
284void kvmppc_restore_tm_pr(struct kvm_vcpu *vcpu);
e32c53d1 285void kvmppc_save_tm_sprs(struct kvm_vcpu *vcpu);
5706340a 286void kvmppc_restore_tm_sprs(struct kvm_vcpu *vcpu);
8d2e2fc5
SG		 287#else
288static inline void kvmppc_save_tm_pr(struct kvm_vcpu *vcpu) {}
289static inline void kvmppc_restore_tm_pr(struct kvm_vcpu *vcpu) {}
e32c53d1 290static inline void kvmppc_save_tm_sprs(struct kvm_vcpu *vcpu) {}
5706340a 291static inline void kvmppc_restore_tm_sprs(struct kvm_vcpu *vcpu) {}
8d2e2fc5
SG		 292#endif
293
8e3f5fc1
PM		 294long kvmhv_nested_init(void);
295void kvmhv_nested_exit(void);
296void kvmhv_vm_nested_init(struct kvm *kvm);
297long kvmhv_set_partition_table(struct kvm_vcpu *vcpu);
6ff887b8 298long kvmhv_copy_tofrom_guest_nested(struct kvm_vcpu *vcpu);
8e3f5fc1
PM		 299void kvmhv_set_ptbl_entry(unsigned int lpid, u64 dw0, u64 dw1);
300void kvmhv_release_all_nested(struct kvm *kvm);
360cae31 301long kvmhv_enter_nested_guest(struct kvm_vcpu *vcpu);
e3b6b466 302long kvmhv_do_nested_tlbie(struct kvm_vcpu *vcpu);
360cae31
PM		 303int kvmhv_run_single_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu,
304 u64 time_limit, unsigned long lpcr);
305void kvmhv_save_hv_regs(struct kvm_vcpu *vcpu, struct hv_guest_state *hr);
306void kvmhv_restore_hv_return_state(struct kvm_vcpu *vcpu,
307 struct hv_guest_state *hr);
873db2cd 308long int kvmhv_nested_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu);
8e3f5fc1 309
7284ca8a
SG		 310void kvmppc_giveup_fac(struct kvm_vcpu *vcpu, ulong fac);
311
644abbb2 312extern int kvm_irq_bypass;
4e342025
AG		 313
314static inline struct kvmppc_vcpu_book3s *to_book3s(struct kvm_vcpu *vcpu)
315{
3ff95502 316 return vcpu->arch.book3s;
4e342025
AG		 317}
318
de56a948
PM		 319/* Also add subarch specific defines */
320
321#ifdef CONFIG_KVM_BOOK3S_32_HANDLER
322#include <asm/kvm_book3s_32.h>
323#endif
324#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
325#include <asm/kvm_book3s_64.h>
326#endif
327
c7f38f46
AG		 328static inline void kvmppc_set_gpr(struct kvm_vcpu *vcpu, int num, ulong val)
329{
1143a706 330 vcpu->arch.regs.gpr[num] = val;
c7f38f46
AG		 331}
332
333static inline ulong kvmppc_get_gpr(struct kvm_vcpu *vcpu, int num)
334{
1143a706 335 return vcpu->arch.regs.gpr[num];
c7f38f46
AG		 336}
337
338static inline void kvmppc_set_cr(struct kvm_vcpu *vcpu, u32 val)
339{
fd0944ba 340 vcpu->arch.regs.ccr = val;
c7f38f46
AG		 341}
342
343static inline u32 kvmppc_get_cr(struct kvm_vcpu *vcpu)
344{
fd0944ba 345 return vcpu->arch.regs.ccr;
c7f38f46
AG		 346}
347
c63517c2 348static inline void kvmppc_set_xer(struct kvm_vcpu *vcpu, ulong val)
c7f38f46 349{
173c520a 350 vcpu->arch.regs.xer = val;
c7f38f46
AG		 351}
352
c63517c2 353static inline ulong kvmppc_get_xer(struct kvm_vcpu *vcpu)
c7f38f46 354{
173c520a 355 return vcpu->arch.regs.xer;
c7f38f46
AG		 356}
357
358static inline void kvmppc_set_ctr(struct kvm_vcpu *vcpu, ulong val)
359{
173c520a 360 vcpu->arch.regs.ctr = val;
c7f38f46
AG		 361}
362
363static inline ulong kvmppc_get_ctr(struct kvm_vcpu *vcpu)
364{
173c520a 365 return vcpu->arch.regs.ctr;
c7f38f46
AG		 366}
367
368static inline void kvmppc_set_lr(struct kvm_vcpu *vcpu, ulong val)
369{
173c520a 370 vcpu->arch.regs.link = val;
c7f38f46
AG		 371}
372
373static inline ulong kvmppc_get_lr(struct kvm_vcpu *vcpu)
374{
173c520a 375 return vcpu->arch.regs.link;
c7f38f46
AG		 376}
377
378static inline void kvmppc_set_pc(struct kvm_vcpu *vcpu, ulong val)
379{
173c520a 380 vcpu->arch.regs.nip = val;
c7f38f46
AG		 381}
382
383static inline ulong kvmppc_get_pc(struct kvm_vcpu *vcpu)
384{
173c520a 385 return vcpu->arch.regs.nip;
c7f38f46
AG		 386}
387
5deb8e7a 388static inline u64 kvmppc_get_msr(struct kvm_vcpu *vcpu);
73601775 389static inline bool kvmppc_need_byteswap(struct kvm_vcpu *vcpu)
c7f38f46 390{
5deb8e7a 391 return (kvmppc_get_msr(vcpu) & MSR_LE) != (MSR_KERNEL & MSR_LE);
73601775 392}
c7f38f46 393
c7f38f46
AG		 394static inline ulong kvmppc_get_fault_dar(struct kvm_vcpu *vcpu)
395{
a2d56020
PM		 396 return vcpu->arch.fault_dar;
397}
398
e59d24e6
GK		 399static inline bool is_kvmppc_resume_guest(int r)
400{
401 return (r == RESUME_GUEST || r == RESUME_GUEST_NV);
402}
403
c12fb43c
AG		 404static inline bool is_kvmppc_hv_enabled(struct kvm *kvm);
405static inline bool kvmppc_supports_magic_page(struct kvm_vcpu *vcpu)
406{
407 /* Only PR KVM supports the magic page */
408 return !is_kvmppc_hv_enabled(vcpu->kvm);
409}
410
99342cf8
DG		 411extern int kvmppc_h_logical_ci_load(struct kvm_vcpu *vcpu);
412extern int kvmppc_h_logical_ci_store(struct kvm_vcpu *vcpu);
413
ad0a048b
AG		 414/* Magic register values loaded into r3 and r4 before the 'sc' assembly
415 * instruction for the OSI hypercalls */
416#define OSI_SC_MAGIC_R3 0x113724FA
417#define OSI_SC_MAGIC_R4 0x77810F9B
418
4e342025 419#define INS_DCBZ 0x7c0007ec
8c32a2ea
BB		 420/* TO = 31 for unconditional trap */
421#define INS_TW 0x7fe00008
4e342025 422
c01e3f66
AG		 423#define SPLIT_HACK_MASK 0xff000000
424#define SPLIT_HACK_OFFS 0xfb000000
425
1e175d2e
SB		 426/*
427 * This packs a VCPU ID from the [0..KVM_MAX_VCPU_ID) space down to the
428 * [0..KVM_MAX_VCPUS) space, using knowledge of the guest's core stride
429 * (but not its actual threading mode, which is not available) to avoid
430 * collisions.
431 *
432 * The implementation leaves VCPU IDs from the range [0..KVM_MAX_VCPUS) (block
433 * 0) unchanged: if the guest is filling each VCORE completely then it will be
434 * using consecutive IDs and it will fill the space without any packing.
435 *
436 * For higher VCPU IDs, the packed ID is based on the VCPU ID modulo
437 * KVM_MAX_VCPUS (effectively masking off the top bits) and then an offset is
438 * added to avoid collisions.
439 *
440 * VCPU IDs in the range [KVM_MAX_VCPUS..(KVM_MAX_VCPUS*2)) (block 1) are only
441 * possible if the guest is leaving at least 1/2 of each VCORE empty, so IDs
442 * can be safely packed into the second half of each VCORE by adding an offset
443 * of (stride / 2).
444 *
445 * Similarly, if VCPU IDs in the range [(KVM_MAX_VCPUS*2)..(KVM_MAX_VCPUS*4))
446 * (blocks 2 and 3) are seen, the guest must be leaving at least 3/4 of each
447 * VCORE empty so packed IDs can be offset by (stride / 4) and (stride * 3 / 4).
448 *
449 * Finally, VCPU IDs from blocks 5..7 will only be seen if the guest is using a
450 * stride of 8 and 1 thread per core so the remaining offsets of 1, 5, 3 and 7
451 * must be free to use.
452 *
453 * (The offsets for each block are stored in block_offsets[], indexed by the
454 * block number if the stride is 8. For cases where the guest's stride is less
455 * than 8, we can re-use the block_offsets array by multiplying the block
456 * number by (MAX_SMT_THREADS / stride) to reach the correct entry.)
457 */
458static inline u32 kvmppc_pack_vcpu_id(struct kvm *kvm, u32 id)
459{
460 const int block_offsets[MAX_SMT_THREADS] = {0, 4, 2, 6, 1, 5, 3, 7};
461 int stride = kvm->arch.emul_smt_mode;
462 int block = (id / KVM_MAX_VCPUS) * (MAX_SMT_THREADS / stride);
463 u32 packed_id;
464
465 if (WARN_ONCE(block >= MAX_SMT_THREADS, "VCPU ID too large to pack"))
466 return 0;
467 packed_id = (id % KVM_MAX_VCPUS) + block_offsets[block];
468 if (WARN_ONCE(packed_id >= KVM_MAX_VCPUS, "VCPU ID packing failed"))
469 return 0;
470 return packed_id;
471}
472
4e342025 473#endif /* __ASM_KVM_BOOK3S_H__ */
Linux 6.x block layer and io_uring tree(s)