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Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
[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
SJS		 199extern 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);
fd10be25
SJS		 202extern bool kvmppc_hv_handle_set_rc(struct kvm *kvm, pgd_t *pgtable,
203 bool writing, unsigned long gpa,
204 unsigned int lpid);
205extern 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);
8cf4ecc0 210extern int kvmppc_init_vm_radix(struct kvm *kvm);
5a319350 211extern void kvmppc_free_radix(struct kvm *kvm);
fd10be25
SJS		 212extern void kvmppc_free_pgtable_radix(struct kvm *kvm, pgd_t *pgd,
213 unsigned int lpid);
5a319350
PM		 214extern int kvmppc_radix_init(void);
215extern void kvmppc_radix_exit(void);
01756099
PM		 216extern int kvm_unmap_radix(struct kvm *kvm, struct kvm_memory_slot *memslot,
217 unsigned long gfn);
fd10be25
SJS		 218extern 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);
01756099
PM		 222extern int kvm_age_radix(struct kvm *kvm, struct kvm_memory_slot *memslot,
223 unsigned long gfn);
224extern int kvm_test_age_radix(struct kvm *kvm, struct kvm_memory_slot *memslot,
225 unsigned long gfn);
8f7b79b8
PM		 226extern long kvmppc_hv_get_dirty_log_radix(struct kvm *kvm,
227 struct kvm_memory_slot *memslot, unsigned long *map);
8cf4ecc0 228extern int kvmhv_get_rmmu_info(struct kvm *kvm, struct kvm_ppc_rmmu_info *info);
9e04ba69 229
35c4a733 230/* XXX remove this export when load_last_inst() is generic */
5467a97d 231extern int kvmppc_ld(struct kvm_vcpu *vcpu, ulong *eaddr, int size, void *ptr, bool data);
4e342025 232extern void kvmppc_book3s_queue_irqprio(struct kvm_vcpu *vcpu, unsigned int vec);
bc5ad3f3
BH		 233extern void kvmppc_book3s_dequeue_irqprio(struct kvm_vcpu *vcpu,
234 unsigned int vec);
de56a948 235extern void kvmppc_inject_interrupt(struct kvm_vcpu *vcpu, int vec, u64 flags);
533082ae 236extern void kvmppc_trigger_fac_interrupt(struct kvm_vcpu *vcpu, ulong fac);
e15a1137
AG		 237extern void kvmppc_set_bat(struct kvm_vcpu *vcpu, struct kvmppc_bat *bat,
238 bool upper, u32 val);
aba3bd7f 239extern void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr);
831317b6 240extern int kvmppc_emulate_paired_single(struct kvm_run *run, struct kvm_vcpu *vcpu);
ba049e93
DW		 241extern kvm_pfn_t kvmppc_gpa_to_pfn(struct kvm_vcpu *vcpu, gpa_t gpa,
242 bool writing, bool *writable);
342d3db7
PM		 243extern void kvmppc_add_revmap_chain(struct kvm *kvm, struct revmap_entry *rev,
244 unsigned long *rmap, long pte_index, int realmode);
e641a317
PM		 245extern void kvmppc_update_dirty_map(struct kvm_memory_slot *memslot,
246 unsigned long gfn, unsigned long psize);
6f22bd32 247extern void kvmppc_invalidate_hpte(struct kvm *kvm, __be64 *hptep,
342d3db7 248 unsigned long pte_index);
6f22bd32 249void kvmppc_clear_ref_hpte(struct kvm *kvm, __be64 *hptep,
55514893 250 unsigned long pte_index);
93e60249
PM		 251extern void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long addr,
252 unsigned long *nb_ret);
c35635ef
PM		 253extern void kvmppc_unpin_guest_page(struct kvm *kvm, void *addr,
254 unsigned long gpa, bool dirty);
7ed661bf
PM		 255extern 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);
6b445ad4
PM		 258extern long kvmppc_do_h_remove(struct kvm *kvm, unsigned long flags,
259 unsigned long pte_index, unsigned long avpn,
260 unsigned long *hpret);
8f7b79b8 261extern long kvmppc_hv_get_dirty_log_hpt(struct kvm *kvm,
dfe49dbd 262 struct kvm_memory_slot *memslot, unsigned long *map);
8f7b79b8
PM		 263extern void kvmppc_harvest_vpa_dirty(struct kvmppc_vpa *vpa,
264 struct kvm_memory_slot *memslot,
265 unsigned long *map);
a0144e2a
PM		 266extern void kvmppc_update_lpcr(struct kvm *kvm, unsigned long lpcr,
267 unsigned long mask);
8e6afa36 268extern void kvmppc_set_fscr(struct kvm_vcpu *vcpu, u64 fscr);
4e342025 269
4bb3c7a0
PM		 270extern int kvmhv_p9_tm_emulation_early(struct kvm_vcpu *vcpu);
271extern int kvmhv_p9_tm_emulation(struct kvm_vcpu *vcpu);
272extern void kvmhv_emulate_tm_rollback(struct kvm_vcpu *vcpu);
273
02143947 274extern void kvmppc_entry_trampoline(void);
de56a948 275extern void kvmppc_hv_entry_trampoline(void);
ca7f4203
AG		 276extern u32 kvmppc_alignment_dsisr(struct kvm_vcpu *vcpu, unsigned int inst);
277extern ulong kvmppc_alignment_dar(struct kvm_vcpu *vcpu, unsigned int inst);
0254f074 278extern int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd);
699a0ea0 279extern void kvmppc_pr_init_default_hcalls(struct kvm *kvm);
ae2113a4
PM		 280extern int kvmppc_hcall_impl_pr(unsigned long cmd);
281extern int kvmppc_hcall_impl_hv_realmode(unsigned long cmd);
07ae5389
AG		 282extern void kvmppc_copy_to_svcpu(struct kvm_vcpu *vcpu);
283extern void kvmppc_copy_from_svcpu(struct kvm_vcpu *vcpu);
8d2e2fc5
SG		 284
285#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
286void kvmppc_save_tm_pr(struct kvm_vcpu *vcpu);
287void kvmppc_restore_tm_pr(struct kvm_vcpu *vcpu);
e32c53d1 288void kvmppc_save_tm_sprs(struct kvm_vcpu *vcpu);
5706340a 289void kvmppc_restore_tm_sprs(struct kvm_vcpu *vcpu);
8d2e2fc5
SG		 290#else
291static inline void kvmppc_save_tm_pr(struct kvm_vcpu *vcpu) {}
292static inline void kvmppc_restore_tm_pr(struct kvm_vcpu *vcpu) {}
e32c53d1 293static inline void kvmppc_save_tm_sprs(struct kvm_vcpu *vcpu) {}
5706340a 294static inline void kvmppc_restore_tm_sprs(struct kvm_vcpu *vcpu) {}
8d2e2fc5
SG		 295#endif
296
8e3f5fc1
PM		 297long kvmhv_nested_init(void);
298void kvmhv_nested_exit(void);
299void kvmhv_vm_nested_init(struct kvm *kvm);
300long kvmhv_set_partition_table(struct kvm_vcpu *vcpu);
301void kvmhv_set_ptbl_entry(unsigned int lpid, u64 dw0, u64 dw1);
302void kvmhv_release_all_nested(struct kvm *kvm);
360cae31 303long kvmhv_enter_nested_guest(struct kvm_vcpu *vcpu);
e3b6b466 304long kvmhv_do_nested_tlbie(struct kvm_vcpu *vcpu);
360cae31
PM		 305int kvmhv_run_single_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu,
306 u64 time_limit, unsigned long lpcr);
307void kvmhv_save_hv_regs(struct kvm_vcpu *vcpu, struct hv_guest_state *hr);
308void kvmhv_restore_hv_return_state(struct kvm_vcpu *vcpu,
309 struct hv_guest_state *hr);
310long int kvmhv_nested_page_fault(struct kvm_vcpu *vcpu);
8e3f5fc1 311
7284ca8a
SG		 312void kvmppc_giveup_fac(struct kvm_vcpu *vcpu, ulong fac);
313
644abbb2 314extern int kvm_irq_bypass;
4e342025
AG		 315
316static inline struct kvmppc_vcpu_book3s *to_book3s(struct kvm_vcpu *vcpu)
317{
3ff95502 318 return vcpu->arch.book3s;
4e342025
AG		 319}
320
de56a948
PM		 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
c7f38f46
AG		 330static inline void kvmppc_set_gpr(struct kvm_vcpu *vcpu, int num, ulong val)
331{
1143a706 332 vcpu->arch.regs.gpr[num] = val;
c7f38f46
AG		 333}
334
335static inline ulong kvmppc_get_gpr(struct kvm_vcpu *vcpu, int num)
336{
1143a706 337 return vcpu->arch.regs.gpr[num];
c7f38f46
AG		 338}
339
340static inline void kvmppc_set_cr(struct kvm_vcpu *vcpu, u32 val)
341{
fd0944ba 342 vcpu->arch.regs.ccr = val;
c7f38f46
AG		 343}
344
345static inline u32 kvmppc_get_cr(struct kvm_vcpu *vcpu)
346{
fd0944ba 347 return vcpu->arch.regs.ccr;
c7f38f46
AG		 348}
349
c63517c2 350static inline void kvmppc_set_xer(struct kvm_vcpu *vcpu, ulong val)
c7f38f46 351{
173c520a 352 vcpu->arch.regs.xer = val;
c7f38f46
AG		 353}
354
c63517c2 355static inline ulong kvmppc_get_xer(struct kvm_vcpu *vcpu)
c7f38f46 356{
173c520a 357 return vcpu->arch.regs.xer;
c7f38f46
AG		 358}
359
360static inline void kvmppc_set_ctr(struct kvm_vcpu *vcpu, ulong val)
361{
173c520a 362 vcpu->arch.regs.ctr = val;
c7f38f46
AG		 363}
364
365static inline ulong kvmppc_get_ctr(struct kvm_vcpu *vcpu)
366{
173c520a 367 return vcpu->arch.regs.ctr;
c7f38f46
AG		 368}
369
370static inline void kvmppc_set_lr(struct kvm_vcpu *vcpu, ulong val)
371{
173c520a 372 vcpu->arch.regs.link = val;
c7f38f46
AG		 373}
374
375static inline ulong kvmppc_get_lr(struct kvm_vcpu *vcpu)
376{
173c520a 377 return vcpu->arch.regs.link;
c7f38f46
AG		 378}
379
380static inline void kvmppc_set_pc(struct kvm_vcpu *vcpu, ulong val)
381{
173c520a 382 vcpu->arch.regs.nip = val;
c7f38f46
AG		 383}
384
385static inline ulong kvmppc_get_pc(struct kvm_vcpu *vcpu)
386{
173c520a 387 return vcpu->arch.regs.nip;
c7f38f46
AG		 388}
389
5deb8e7a 390static inline u64 kvmppc_get_msr(struct kvm_vcpu *vcpu);
73601775 391static inline bool kvmppc_need_byteswap(struct kvm_vcpu *vcpu)
c7f38f46 392{
5deb8e7a 393 return (kvmppc_get_msr(vcpu) & MSR_LE) != (MSR_KERNEL & MSR_LE);
73601775 394}
c7f38f46 395
c7f38f46
AG		 396static inline ulong kvmppc_get_fault_dar(struct kvm_vcpu *vcpu)
397{
a2d56020
PM		 398 return vcpu->arch.fault_dar;
399}
400
e59d24e6
GK		 401static inline bool is_kvmppc_resume_guest(int r)
402{
403 return (r == RESUME_GUEST || r == RESUME_GUEST_NV);
404}
405
c12fb43c
AG		 406static inline bool is_kvmppc_hv_enabled(struct kvm *kvm);
407static 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
99342cf8
DG		 413extern int kvmppc_h_logical_ci_load(struct kvm_vcpu *vcpu);
414extern int kvmppc_h_logical_ci_store(struct kvm_vcpu *vcpu);
415
ad0a048b
AG		 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
4e342025 421#define INS_DCBZ 0x7c0007ec
8c32a2ea
BB		 422/* TO = 31 for unconditional trap */
423#define INS_TW 0x7fe00008
4e342025 424
c01e3f66
AG		 425#define SPLIT_HACK_MASK 0xff000000
426#define SPLIT_HACK_OFFS 0xfb000000
427
1e175d2e
SB		 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 */
460static 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
4e342025 475#endif /* __ASM_KVM_BOOK3S_H__ */
Linux 6.x block layer and io_uring tree(s)