1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (C) 2008-2011 Freescale Semiconductor, Inc. All rights reserved.
4  *
5  * Author: Yu Liu <yu.liu@freescale.com>
6  *         Scott Wood <scottwood@freescale.com>
7  *         Ashish Kalra <ashish.kalra@freescale.com>
8  *         Varun Sethi <varun.sethi@freescale.com>
9  *
10  * Description:
11  * This file is based on arch/powerpc/kvm/44x_tlb.h and
12  * arch/powerpc/include/asm/kvm_44x.h by Hollis Blanchard <hollisb@us.ibm.com>,
13  * Copyright IBM Corp. 2007-2008
14  */
15 
16 #ifndef KVM_E500_H
17 #define KVM_E500_H
18 
19 #include <linux/kvm_host.h>
20 #include <asm/nohash/mmu-book3e.h>
21 #include <asm/tlb.h>
22 #include <asm/cputhreads.h>
23 
24 enum vcpu_ftr {
25 	VCPU_FTR_MMU_V2
26 };
27 
28 #define E500_PID_NUM   3
29 #define E500_TLB_NUM   2
30 
31 /* entry is mapped somewhere in host TLB */
32 #define E500_TLB_VALID		(1 << 31)
33 /* TLB1 entry is mapped by host TLB1, tracked by bitmaps */
34 #define E500_TLB_BITMAP		(1 << 30)
35 /* TLB1 entry is mapped by host TLB0 */
36 #define E500_TLB_TLB0		(1 << 29)
37 /* bits [6-5] MAS2_X1 and MAS2_X0 and [4-0] bits for WIMGE */
38 #define E500_TLB_MAS2_ATTR	(0x7f)
39 
40 struct tlbe_ref {
41 	kvm_pfn_t pfn;		/* valid only for TLB0, except briefly */
42 	unsigned int flags;	/* E500_TLB_* */
43 };
44 
45 struct tlbe_priv {
46 	struct tlbe_ref ref;
47 };
48 
49 #ifdef CONFIG_KVM_E500V2
50 struct vcpu_id_table;
51 #endif
52 
53 struct kvmppc_e500_tlb_params {
54 	int entries, ways, sets;
55 };
56 
57 struct kvmppc_vcpu_e500 {
58 	struct kvm_vcpu vcpu;
59 
60 	/* Unmodified copy of the guest's TLB -- shared with host userspace. */
61 	struct kvm_book3e_206_tlb_entry *gtlb_arch;
62 
63 	/* Starting entry number in gtlb_arch[] */
64 	int gtlb_offset[E500_TLB_NUM];
65 
66 	/* KVM internal information associated with each guest TLB entry */
67 	struct tlbe_priv *gtlb_priv[E500_TLB_NUM];
68 
69 	struct kvmppc_e500_tlb_params gtlb_params[E500_TLB_NUM];
70 
71 	unsigned int gtlb_nv[E500_TLB_NUM];
72 
73 	unsigned int host_tlb1_nv;
74 
75 	u32 svr;
76 	u32 l1csr0;
77 	u32 l1csr1;
78 	u32 hid0;
79 	u32 hid1;
80 	u64 mcar;
81 
82 	struct page **shared_tlb_pages;
83 	int num_shared_tlb_pages;
84 
85 	u64 *g2h_tlb1_map;
86 	unsigned int *h2g_tlb1_rmap;
87 
88 	/* Minimum and maximum address mapped my TLB1 */
89 	unsigned long tlb1_min_eaddr;
90 	unsigned long tlb1_max_eaddr;
91 
92 #ifdef CONFIG_KVM_E500V2
93 	u32 pid[E500_PID_NUM];
94 
95 	/* vcpu id table */
96 	struct vcpu_id_table *idt;
97 #endif
98 };
99 
to_e500(struct kvm_vcpu * vcpu)100 static inline struct kvmppc_vcpu_e500 *to_e500(struct kvm_vcpu *vcpu)
101 {
102 	return container_of(vcpu, struct kvmppc_vcpu_e500, vcpu);
103 }
104 
105 
106 /* This geometry is the legacy default -- can be overridden by userspace */
107 #define KVM_E500_TLB0_WAY_SIZE		128
108 #define KVM_E500_TLB0_WAY_NUM		2
109 
110 #define KVM_E500_TLB0_SIZE  (KVM_E500_TLB0_WAY_SIZE * KVM_E500_TLB0_WAY_NUM)
111 #define KVM_E500_TLB1_SIZE  16
112 
113 #define index_of(tlbsel, esel)	(((tlbsel) << 16) | ((esel) & 0xFFFF))
114 #define tlbsel_of(index)	((index) >> 16)
115 #define esel_of(index)		((index) & 0xFFFF)
116 
117 #define E500_TLB_USER_PERM_MASK (MAS3_UX|MAS3_UR|MAS3_UW)
118 #define E500_TLB_SUPER_PERM_MASK (MAS3_SX|MAS3_SR|MAS3_SW)
119 #define MAS2_ATTRIB_MASK \
120 	  (MAS2_X0 | MAS2_X1 | MAS2_E | MAS2_G)
121 #define MAS3_ATTRIB_MASK \
122 	  (MAS3_U0 | MAS3_U1 | MAS3_U2 | MAS3_U3 \
123 	   | E500_TLB_USER_PERM_MASK | E500_TLB_SUPER_PERM_MASK)
124 
125 int kvmppc_e500_emul_mt_mmucsr0(struct kvmppc_vcpu_e500 *vcpu_e500,
126 				ulong value);
127 int kvmppc_e500_emul_tlbwe(struct kvm_vcpu *vcpu);
128 int kvmppc_e500_emul_tlbre(struct kvm_vcpu *vcpu);
129 int kvmppc_e500_emul_tlbivax(struct kvm_vcpu *vcpu, gva_t ea);
130 int kvmppc_e500_emul_tlbilx(struct kvm_vcpu *vcpu, int type, gva_t ea);
131 int kvmppc_e500_emul_tlbsx(struct kvm_vcpu *vcpu, gva_t ea);
132 int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 *vcpu_e500);
133 void kvmppc_e500_tlb_uninit(struct kvmppc_vcpu_e500 *vcpu_e500);
134 
135 void kvmppc_get_sregs_e500_tlb(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs);
136 int kvmppc_set_sregs_e500_tlb(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs);
137 
138 int kvmppc_get_one_reg_e500_tlb(struct kvm_vcpu *vcpu, u64 id,
139 				union kvmppc_one_reg *val);
140 int kvmppc_set_one_reg_e500_tlb(struct kvm_vcpu *vcpu, u64 id,
141 			       union kvmppc_one_reg *val);
142 
143 #ifdef CONFIG_KVM_E500V2
144 unsigned int kvmppc_e500_get_sid(struct kvmppc_vcpu_e500 *vcpu_e500,
145 				 unsigned int as, unsigned int gid,
146 				 unsigned int pr, int avoid_recursion);
147 #endif
148 
149 /* TLB helper functions */
150 static inline unsigned int
get_tlb_size(const struct kvm_book3e_206_tlb_entry * tlbe)151 get_tlb_size(const struct kvm_book3e_206_tlb_entry *tlbe)
152 {
153 	return (tlbe->mas1 >> 7) & 0x1f;
154 }
155 
get_tlb_eaddr(const struct kvm_book3e_206_tlb_entry * tlbe)156 static inline gva_t get_tlb_eaddr(const struct kvm_book3e_206_tlb_entry *tlbe)
157 {
158 	return tlbe->mas2 & MAS2_EPN;
159 }
160 
get_tlb_bytes(const struct kvm_book3e_206_tlb_entry * tlbe)161 static inline u64 get_tlb_bytes(const struct kvm_book3e_206_tlb_entry *tlbe)
162 {
163 	unsigned int pgsize = get_tlb_size(tlbe);
164 	return 1ULL << 10 << pgsize;
165 }
166 
get_tlb_end(const struct kvm_book3e_206_tlb_entry * tlbe)167 static inline gva_t get_tlb_end(const struct kvm_book3e_206_tlb_entry *tlbe)
168 {
169 	u64 bytes = get_tlb_bytes(tlbe);
170 	return get_tlb_eaddr(tlbe) + bytes - 1;
171 }
172 
get_tlb_raddr(const struct kvm_book3e_206_tlb_entry * tlbe)173 static inline u64 get_tlb_raddr(const struct kvm_book3e_206_tlb_entry *tlbe)
174 {
175 	return tlbe->mas7_3 & ~0xfffULL;
176 }
177 
178 static inline unsigned int
get_tlb_tid(const struct kvm_book3e_206_tlb_entry * tlbe)179 get_tlb_tid(const struct kvm_book3e_206_tlb_entry *tlbe)
180 {
181 	return (tlbe->mas1 >> 16) & 0xff;
182 }
183 
184 static inline unsigned int
get_tlb_ts(const struct kvm_book3e_206_tlb_entry * tlbe)185 get_tlb_ts(const struct kvm_book3e_206_tlb_entry *tlbe)
186 {
187 	return (tlbe->mas1 >> 12) & 0x1;
188 }
189 
190 static inline unsigned int
get_tlb_v(const struct kvm_book3e_206_tlb_entry * tlbe)191 get_tlb_v(const struct kvm_book3e_206_tlb_entry *tlbe)
192 {
193 	return (tlbe->mas1 >> 31) & 0x1;
194 }
195 
196 static inline unsigned int
get_tlb_iprot(const struct kvm_book3e_206_tlb_entry * tlbe)197 get_tlb_iprot(const struct kvm_book3e_206_tlb_entry *tlbe)
198 {
199 	return (tlbe->mas1 >> 30) & 0x1;
200 }
201 
202 static inline unsigned int
get_tlb_tsize(const struct kvm_book3e_206_tlb_entry * tlbe)203 get_tlb_tsize(const struct kvm_book3e_206_tlb_entry *tlbe)
204 {
205 	return (tlbe->mas1 & MAS1_TSIZE_MASK) >> MAS1_TSIZE_SHIFT;
206 }
207 
get_cur_pid(struct kvm_vcpu * vcpu)208 static inline unsigned int get_cur_pid(struct kvm_vcpu *vcpu)
209 {
210 	return vcpu->arch.pid & 0xff;
211 }
212 
get_cur_as(struct kvm_vcpu * vcpu)213 static inline unsigned int get_cur_as(struct kvm_vcpu *vcpu)
214 {
215 	return !!(vcpu->arch.shared->msr & (MSR_IS | MSR_DS));
216 }
217 
get_cur_pr(struct kvm_vcpu * vcpu)218 static inline unsigned int get_cur_pr(struct kvm_vcpu *vcpu)
219 {
220 	return !!(vcpu->arch.shared->msr & MSR_PR);
221 }
222 
get_cur_spid(const struct kvm_vcpu * vcpu)223 static inline unsigned int get_cur_spid(const struct kvm_vcpu *vcpu)
224 {
225 	return (vcpu->arch.shared->mas6 >> 16) & 0xff;
226 }
227 
get_cur_sas(const struct kvm_vcpu * vcpu)228 static inline unsigned int get_cur_sas(const struct kvm_vcpu *vcpu)
229 {
230 	return vcpu->arch.shared->mas6 & 0x1;
231 }
232 
get_tlb_tlbsel(const struct kvm_vcpu * vcpu)233 static inline unsigned int get_tlb_tlbsel(const struct kvm_vcpu *vcpu)
234 {
235 	/*
236 	 * Manual says that tlbsel has 2 bits wide.
237 	 * Since we only have two TLBs, only lower bit is used.
238 	 */
239 	return (vcpu->arch.shared->mas0 >> 28) & 0x1;
240 }
241 
get_tlb_nv_bit(const struct kvm_vcpu * vcpu)242 static inline unsigned int get_tlb_nv_bit(const struct kvm_vcpu *vcpu)
243 {
244 	return vcpu->arch.shared->mas0 & 0xfff;
245 }
246 
get_tlb_esel_bit(const struct kvm_vcpu * vcpu)247 static inline unsigned int get_tlb_esel_bit(const struct kvm_vcpu *vcpu)
248 {
249 	return (vcpu->arch.shared->mas0 >> 16) & 0xfff;
250 }
251 
tlbe_is_host_safe(const struct kvm_vcpu * vcpu,const struct kvm_book3e_206_tlb_entry * tlbe)252 static inline int tlbe_is_host_safe(const struct kvm_vcpu *vcpu,
253 			const struct kvm_book3e_206_tlb_entry *tlbe)
254 {
255 	gpa_t gpa;
256 
257 	if (!get_tlb_v(tlbe))
258 		return 0;
259 
260 #ifndef CONFIG_KVM_BOOKE_HV
261 	/* Does it match current guest AS? */
262 	/* XXX what about IS != DS? */
263 	if (get_tlb_ts(tlbe) != !!(vcpu->arch.shared->msr & MSR_IS))
264 		return 0;
265 #endif
266 
267 	gpa = get_tlb_raddr(tlbe);
268 	if (!gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT))
269 		/* Mapping is not for RAM. */
270 		return 0;
271 
272 	return 1;
273 }
274 
get_entry(struct kvmppc_vcpu_e500 * vcpu_e500,int tlbsel,int entry)275 static inline struct kvm_book3e_206_tlb_entry *get_entry(
276 	struct kvmppc_vcpu_e500 *vcpu_e500, int tlbsel, int entry)
277 {
278 	int offset = vcpu_e500->gtlb_offset[tlbsel];
279 	return &vcpu_e500->gtlb_arch[offset + entry];
280 }
281 
282 void kvmppc_e500_tlbil_one(struct kvmppc_vcpu_e500 *vcpu_e500,
283 			   struct kvm_book3e_206_tlb_entry *gtlbe);
284 void kvmppc_e500_tlbil_all(struct kvmppc_vcpu_e500 *vcpu_e500);
285 
286 #ifdef CONFIG_KVM_BOOKE_HV
287 #define kvmppc_e500_get_tlb_stid(vcpu, gtlbe)       get_tlb_tid(gtlbe)
288 #define get_tlbmiss_tid(vcpu)           get_cur_pid(vcpu)
289 #define get_tlb_sts(gtlbe)              (gtlbe->mas1 & MAS1_TS)
290 
291 /*
292  * These functions should be called with preemption disabled
293  * and the returned value is valid only in that context
294  */
get_thread_specific_lpid(int vm_lpid)295 static inline int get_thread_specific_lpid(int vm_lpid)
296 {
297 	int vcpu_lpid = vm_lpid;
298 
299 	if (threads_per_core == 2)
300 		vcpu_lpid |= smp_processor_id() & 1;
301 
302 	return vcpu_lpid;
303 }
304 
get_lpid(struct kvm_vcpu * vcpu)305 static inline int get_lpid(struct kvm_vcpu *vcpu)
306 {
307 	return get_thread_specific_lpid(vcpu->kvm->arch.lpid);
308 }
309 #else
310 unsigned int kvmppc_e500_get_tlb_stid(struct kvm_vcpu *vcpu,
311 				      struct kvm_book3e_206_tlb_entry *gtlbe);
312 
get_tlbmiss_tid(struct kvm_vcpu * vcpu)313 static inline unsigned int get_tlbmiss_tid(struct kvm_vcpu *vcpu)
314 {
315 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
316 	unsigned int tidseld = (vcpu->arch.shared->mas4 >> 16) & 0xf;
317 
318 	return vcpu_e500->pid[tidseld];
319 }
320 
321 /* Force TS=1 for all guest mappings. */
322 #define get_tlb_sts(gtlbe)              (MAS1_TS)
323 #endif /* !BOOKE_HV */
324 
has_feature(const struct kvm_vcpu * vcpu,enum vcpu_ftr ftr)325 static inline bool has_feature(const struct kvm_vcpu *vcpu,
326 			       enum vcpu_ftr ftr)
327 {
328 	bool has_ftr;
329 	switch (ftr) {
330 	case VCPU_FTR_MMU_V2:
331 		has_ftr = ((vcpu->arch.mmucfg & MMUCFG_MAVN) == MMUCFG_MAVN_V2);
332 		break;
333 	default:
334 		return false;
335 	}
336 	return has_ftr;
337 }
338 
339 #endif /* KVM_E500_H */
340