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KVM: PPC: Book3S HV: Cleanups - constify memslots, fix comments
[linux-2.6-block.git] / arch / powerpc / include / asm / kvm_book3s.h
CommitLineData
4e342025
AG		 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>
2191d657 25#include <asm/kvm_book3s_asm.h>
4e342025 26
4e342025 27struct kvmppc_bat {
e15a1137 28 u64 raw;
4e342025
AG		 29 u32 bepi;
30 u32 bepi_mask;
4e342025
AG		 31 u32 brpn;
32 u8 wimg;
33 u8 pp;
3ed9c6d2
AG		 34 bool vs : 1;
35 bool vp : 1;
4e342025
AG		 36};
37
38struct kvmppc_sid_map {
39 u64 guest_vsid;
40 u64 guest_esid;
41 u64 host_vsid;
3ed9c6d2 42 bool valid : 1;
4e342025
AG		 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
8b6db3bc
AG		 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
c4befc58
PM		 56struct 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;
a4a0f252
PM		 61#ifdef CONFIG_PPC_BOOK3S_64
62 struct hlist_node list_vpte_64k;
63#endif
c4befc58 64 struct rcu_head rcu_head;
5524a27d 65 u64 host_vpn;
c4befc58
PM		 66 u64 pfn;
67 ulong slot;
68 struct kvmppc_pte pte;
c9029c34 69 int pagesize;
c4befc58
PM		 70};
71
e64fb7e2
SJS		 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 */
79struct 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;
7b5f8272 89 struct kvm_vcpu *runnable_threads[MAX_SMT_THREADS];
e64fb7e2
SJS		 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 */
57b8daa7 99 u64 tb_offset_applied; /* timebase offset currently in force */
e64fb7e2
SJS		 100 ulong lpcr;
101 u32 arch_compat;
102 ulong pcr;
103 ulong dpdes; /* doorbell state (POWER8) */
88b02cf9 104 ulong vtb; /* virtual timebase */
e64fb7e2 105 ulong conferring_threads;
0cda69dd 106 unsigned int halt_poll_ns;
7aa15842 107 atomic_t online_count;
e64fb7e2
SJS		 108};
109
4e342025 110struct kvmppc_vcpu_book3s {
4e342025 111 struct kvmppc_sid_map sid_map[SID_MAP_NUM];
4e342025
AG		 112 struct {
113 u64 esid;
114 u64 vsid;
115 } slb_shadow[64];
116 u8 slb_shadow_max;
4e342025
AG		 117 struct kvmppc_bat ibat[8];
118 struct kvmppc_bat dbat[8];
119 u64 hid[6];
d6d549b2 120 u64 gqr[8];
4e342025 121 u64 sdr1;
4e342025
AG		 122 u64 hior;
123 u64 msr_mask;
88b02cf9 124 u64 vtb;
8b6db3bc
AG		 125#ifdef CONFIG_PPC_BOOK3S_32
126 u32 vsid_pool[VSID_POOL_SIZE];
ffe36492 127 u32 vsid_next;
8b6db3bc 128#else
ffe36492
BH		 129 u64 proto_vsid_first;
130 u64 proto_vsid_max;
131 u64 proto_vsid_next;
8b6db3bc
AG		 132#endif
133 int context_id[SID_CONTEXTS];
c4befc58 134
1022fc3d
AG		 135 bool hior_explicit; /* HIOR is set by ioctl, not PVR */
136
c4befc58
PM		 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];
a4a0f252
PM		 141#ifdef CONFIG_PPC_BOOK3S_64
142 struct hlist_head hpte_hash_vpte_64k[HPTEG_HASH_NUM_VPTE_64K];
143#endif
c4befc58
PM		 144 int hpte_cache_count;
145 spinlock_t mmu_lock;
4e342025
AG		 146};
147
c9029c34
PM		 148#define VSID_REAL 0x07ffffffffc00000ULL
149#define VSID_BAT 0x07ffffffffb00000ULL
150#define VSID_64K 0x0800000000000000ULL
0f296829 151#define VSID_1T 0x1000000000000000ULL
f7bc74e1
AG		 152#define VSID_REAL_DR 0x2000000000000000ULL
153#define VSID_REAL_IR 0x4000000000000000ULL
5a1b419f 154#define VSID_PR 0x8000000000000000ULL
4e342025 155
af7b4d10 156extern void kvmppc_mmu_pte_flush(struct kvm_vcpu *vcpu, ulong ea, ulong ea_mask);
4e342025 157extern void kvmppc_mmu_pte_vflush(struct kvm_vcpu *vcpu, u64 vp, u64 vp_mask);
af7b4d10 158extern void kvmppc_mmu_pte_pflush(struct kvm_vcpu *vcpu, ulong pa_start, ulong pa_end);
4e342025
AG		 159extern void kvmppc_set_msr(struct kvm_vcpu *vcpu, u64 new_msr);
160extern void kvmppc_mmu_book3s_64_init(struct kvm_vcpu *vcpu);
161extern void kvmppc_mmu_book3s_32_init(struct kvm_vcpu *vcpu);
de56a948 162extern void kvmppc_mmu_book3s_hv_init(struct kvm_vcpu *vcpu);
93b159b4
PM		 163extern int kvmppc_mmu_map_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte,
164 bool iswrite);
165extern void kvmppc_mmu_unmap_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte);
4e342025 166extern int kvmppc_mmu_map_segment(struct kvm_vcpu *vcpu, ulong eaddr);
0f296829 167extern void kvmppc_mmu_flush_segment(struct kvm_vcpu *vcpu, ulong eaddr, ulong seg_size);
4e342025 168extern void kvmppc_mmu_flush_segments(struct kvm_vcpu *vcpu);
697d3899
PM		 169extern int kvmppc_book3s_hv_page_fault(struct kvm_run *run,
170 struct kvm_vcpu *vcpu, unsigned long addr,
171 unsigned long status);
172extern long kvmppc_hv_find_lock_hpte(struct kvm *kvm, gva_t eaddr,
173 unsigned long slb_v, unsigned long valid);
5a319350
PM		 174extern int kvmppc_hv_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu,
175 unsigned long gpa, gva_t ea, int is_store);
fef093be
AG		 176
177extern void kvmppc_mmu_hpte_cache_map(struct kvm_vcpu *vcpu, struct hpte_cache *pte);
178extern struct hpte_cache *kvmppc_mmu_hpte_cache_next(struct kvm_vcpu *vcpu);
d78bca72 179extern void kvmppc_mmu_hpte_cache_free(struct hpte_cache *pte);
fef093be
AG		 180extern void kvmppc_mmu_hpte_destroy(struct kvm_vcpu *vcpu);
181extern int kvmppc_mmu_hpte_init(struct kvm_vcpu *vcpu);
182extern void kvmppc_mmu_invalidate_pte(struct kvm_vcpu *vcpu, struct hpte_cache *pte);
183extern int kvmppc_mmu_hpte_sysinit(void);
184extern void kvmppc_mmu_hpte_sysexit(void);
de56a948 185extern int kvmppc_mmu_hv_init(void);
ae2113a4 186extern int kvmppc_book3s_hcall_implemented(struct kvm *kvm, unsigned long hc);
fef093be 187
5a319350
PM		 188extern int kvmppc_book3s_radix_page_fault(struct kvm_run *run,
189 struct kvm_vcpu *vcpu,
190 unsigned long ea, unsigned long dsisr);
fd10be25
SJS		 191extern 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);
9811c78e
SJS		 194extern 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);
9e04ba69
PM		 197extern int kvmppc_mmu_radix_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
198 struct kvmppc_pte *gpte, bool data, bool iswrite);
8cf531ed 199extern void kvmppc_unmap_pte(struct kvm *kvm, pte_t *pte, unsigned long gpa,
c43c3a86
PM		 200 unsigned int shift,
201 const struct kvm_memory_slot *memslot,
8cf531ed 202 unsigned int lpid);
fd10be25
SJS		 203extern bool kvmppc_hv_handle_set_rc(struct kvm *kvm, pgd_t *pgtable,
204 bool writing, unsigned long gpa,
205 unsigned int lpid);
206extern int kvmppc_book3s_instantiate_page(struct kvm_vcpu *vcpu,
207 unsigned long gpa,
208 struct kvm_memory_slot *memslot,
209 bool writing, bool kvm_ro,
210 pte_t *inserted_pte, unsigned int *levelp);
8cf4ecc0 211extern int kvmppc_init_vm_radix(struct kvm *kvm);
5a319350 212extern void kvmppc_free_radix(struct kvm *kvm);
fd10be25
SJS		 213extern void kvmppc_free_pgtable_radix(struct kvm *kvm, pgd_t *pgd,
214 unsigned int lpid);
5a319350
PM		 215extern int kvmppc_radix_init(void);
216extern void kvmppc_radix_exit(void);
01756099
PM		 217extern int kvm_unmap_radix(struct kvm *kvm, struct kvm_memory_slot *memslot,
218 unsigned long gfn);
219extern int kvm_age_radix(struct kvm *kvm, struct kvm_memory_slot *memslot,
220 unsigned long gfn);
221extern int kvm_test_age_radix(struct kvm *kvm, struct kvm_memory_slot *memslot,
222 unsigned long gfn);
8f7b79b8
PM		 223extern long kvmppc_hv_get_dirty_log_radix(struct kvm *kvm,
224 struct kvm_memory_slot *memslot, unsigned long *map);
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);
298void kvmhv_set_ptbl_entry(unsigned int lpid, u64 dw0, u64 dw1);
299void kvmhv_release_all_nested(struct kvm *kvm);
360cae31 300long kvmhv_enter_nested_guest(struct kvm_vcpu *vcpu);
e3b6b466 301long kvmhv_do_nested_tlbie(struct kvm_vcpu *vcpu);
360cae31
PM		 302int kvmhv_run_single_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu,
303 u64 time_limit, unsigned long lpcr);
304void kvmhv_save_hv_regs(struct kvm_vcpu *vcpu, struct hv_guest_state *hr);
305void kvmhv_restore_hv_return_state(struct kvm_vcpu *vcpu,
306 struct hv_guest_state *hr);
307long int kvmhv_nested_page_fault(struct kvm_vcpu *vcpu);
8e3f5fc1 308
7284ca8a
SG		 309void kvmppc_giveup_fac(struct kvm_vcpu *vcpu, ulong fac);
310
644abbb2 311extern int kvm_irq_bypass;
4e342025
AG		 312
313static inline struct kvmppc_vcpu_book3s *to_book3s(struct kvm_vcpu *vcpu)
314{
3ff95502 315 return vcpu->arch.book3s;
4e342025
AG		 316}
317
de56a948
PM		 318/* Also add subarch specific defines */
319
320#ifdef CONFIG_KVM_BOOK3S_32_HANDLER
321#include <asm/kvm_book3s_32.h>
322#endif
323#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
324#include <asm/kvm_book3s_64.h>
325#endif
326
c7f38f46
AG		 327static inline void kvmppc_set_gpr(struct kvm_vcpu *vcpu, int num, ulong val)
328{
1143a706 329 vcpu->arch.regs.gpr[num] = val;
c7f38f46
AG		 330}
331
332static inline ulong kvmppc_get_gpr(struct kvm_vcpu *vcpu, int num)
333{
1143a706 334 return vcpu->arch.regs.gpr[num];
c7f38f46
AG		 335}
336
337static inline void kvmppc_set_cr(struct kvm_vcpu *vcpu, u32 val)
338{
fd0944ba 339 vcpu->arch.regs.ccr = val;
c7f38f46
AG		 340}
341
342static inline u32 kvmppc_get_cr(struct kvm_vcpu *vcpu)
343{
fd0944ba 344 return vcpu->arch.regs.ccr;
c7f38f46
AG		 345}
346
c63517c2 347static inline void kvmppc_set_xer(struct kvm_vcpu *vcpu, ulong val)
c7f38f46 348{
173c520a 349 vcpu->arch.regs.xer = val;
c7f38f46
AG		 350}
351
c63517c2 352static inline ulong kvmppc_get_xer(struct kvm_vcpu *vcpu)
c7f38f46 353{
173c520a 354 return vcpu->arch.regs.xer;
c7f38f46
AG		 355}
356
357static inline void kvmppc_set_ctr(struct kvm_vcpu *vcpu, ulong val)
358{
173c520a 359 vcpu->arch.regs.ctr = val;
c7f38f46
AG		 360}
361
362static inline ulong kvmppc_get_ctr(struct kvm_vcpu *vcpu)
363{
173c520a 364 return vcpu->arch.regs.ctr;
c7f38f46
AG		 365}
366
367static inline void kvmppc_set_lr(struct kvm_vcpu *vcpu, ulong val)
368{
173c520a 369 vcpu->arch.regs.link = val;
c7f38f46
AG		 370}
371
372static inline ulong kvmppc_get_lr(struct kvm_vcpu *vcpu)
373{
173c520a 374 return vcpu->arch.regs.link;
c7f38f46
AG		 375}
376
377static inline void kvmppc_set_pc(struct kvm_vcpu *vcpu, ulong val)
378{
173c520a 379 vcpu->arch.regs.nip = val;
c7f38f46
AG		 380}
381
382static inline ulong kvmppc_get_pc(struct kvm_vcpu *vcpu)
383{
173c520a 384 return vcpu->arch.regs.nip;
c7f38f46
AG		 385}
386
5deb8e7a 387static inline u64 kvmppc_get_msr(struct kvm_vcpu *vcpu);
73601775 388static inline bool kvmppc_need_byteswap(struct kvm_vcpu *vcpu)
c7f38f46 389{
5deb8e7a 390 return (kvmppc_get_msr(vcpu) & MSR_LE) != (MSR_KERNEL & MSR_LE);
73601775 391}
c7f38f46 392
c7f38f46
AG		 393static inline ulong kvmppc_get_fault_dar(struct kvm_vcpu *vcpu)
394{
a2d56020
PM		 395 return vcpu->arch.fault_dar;
396}
397
e59d24e6
GK		 398static inline bool is_kvmppc_resume_guest(int r)
399{
400 return (r == RESUME_GUEST || r == RESUME_GUEST_NV);
401}
402
c12fb43c
AG		 403static inline bool is_kvmppc_hv_enabled(struct kvm *kvm);
404static inline bool kvmppc_supports_magic_page(struct kvm_vcpu *vcpu)
405{
406 /* Only PR KVM supports the magic page */
407 return !is_kvmppc_hv_enabled(vcpu->kvm);
408}
409
99342cf8
DG		 410extern int kvmppc_h_logical_ci_load(struct kvm_vcpu *vcpu);
411extern int kvmppc_h_logical_ci_store(struct kvm_vcpu *vcpu);
412
ad0a048b
AG		 413/* Magic register values loaded into r3 and r4 before the 'sc' assembly
414 * instruction for the OSI hypercalls */
415#define OSI_SC_MAGIC_R3 0x113724FA
416#define OSI_SC_MAGIC_R4 0x77810F9B
417
4e342025 418#define INS_DCBZ 0x7c0007ec
8c32a2ea
BB		 419/* TO = 31 for unconditional trap */
420#define INS_TW 0x7fe00008
4e342025 421
c01e3f66
AG		 422#define SPLIT_HACK_MASK 0xff000000
423#define SPLIT_HACK_OFFS 0xfb000000
424
1e175d2e
SB		 425/*
426 * This packs a VCPU ID from the [0..KVM_MAX_VCPU_ID) space down to the
427 * [0..KVM_MAX_VCPUS) space, using knowledge of the guest's core stride
428 * (but not its actual threading mode, which is not available) to avoid
429 * collisions.
430 *
431 * The implementation leaves VCPU IDs from the range [0..KVM_MAX_VCPUS) (block
432 * 0) unchanged: if the guest is filling each VCORE completely then it will be
433 * using consecutive IDs and it will fill the space without any packing.
434 *
435 * For higher VCPU IDs, the packed ID is based on the VCPU ID modulo
436 * KVM_MAX_VCPUS (effectively masking off the top bits) and then an offset is
437 * added to avoid collisions.
438 *
439 * VCPU IDs in the range [KVM_MAX_VCPUS..(KVM_MAX_VCPUS*2)) (block 1) are only
440 * possible if the guest is leaving at least 1/2 of each VCORE empty, so IDs
441 * can be safely packed into the second half of each VCORE by adding an offset
442 * of (stride / 2).
443 *
444 * Similarly, if VCPU IDs in the range [(KVM_MAX_VCPUS*2)..(KVM_MAX_VCPUS*4))
445 * (blocks 2 and 3) are seen, the guest must be leaving at least 3/4 of each
446 * VCORE empty so packed IDs can be offset by (stride / 4) and (stride * 3 / 4).
447 *
448 * Finally, VCPU IDs from blocks 5..7 will only be seen if the guest is using a
449 * stride of 8 and 1 thread per core so the remaining offsets of 1, 5, 3 and 7
450 * must be free to use.
451 *
452 * (The offsets for each block are stored in block_offsets[], indexed by the
453 * block number if the stride is 8. For cases where the guest's stride is less
454 * than 8, we can re-use the block_offsets array by multiplying the block
455 * number by (MAX_SMT_THREADS / stride) to reach the correct entry.)
456 */
457static inline u32 kvmppc_pack_vcpu_id(struct kvm *kvm, u32 id)
458{
459 const int block_offsets[MAX_SMT_THREADS] = {0, 4, 2, 6, 1, 5, 3, 7};
460 int stride = kvm->arch.emul_smt_mode;
461 int block = (id / KVM_MAX_VCPUS) * (MAX_SMT_THREADS / stride);
462 u32 packed_id;
463
464 if (WARN_ONCE(block >= MAX_SMT_THREADS, "VCPU ID too large to pack"))
465 return 0;
466 packed_id = (id % KVM_MAX_VCPUS) + block_offsets[block];
467 if (WARN_ONCE(packed_id >= KVM_MAX_VCPUS, "VCPU ID packing failed"))
468 return 0;
469 return packed_id;
470}
471
4e342025 472#endif /* __ASM_KVM_BOOK3S_H__ */
Linux 6.x block layer and io_uring tree(s)