e500.h

  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-e500.h>
 21#include <asm/tlb.h>
 22#include <asm/cputhreads.h>
 23
 24enum 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/* entry is writable on the host */
 38#define E500_TLB_WRITABLE	(1 << 28)
 39/* bits [6-5] MAS2_X1 and MAS2_X0 and [4-0] bits for WIMGE */
 40#define E500_TLB_MAS2_ATTR	(0x7f)
 41
 42struct tlbe_ref {
 43	kvm_pfn_t pfn;		/* valid only for TLB0, except briefly */
 44	unsigned int flags;	/* E500_TLB_* */
 45};
 46
 47struct tlbe_priv {
 48	struct tlbe_ref ref;
 49};
 50
 51#ifdef CONFIG_KVM_E500V2
 52struct vcpu_id_table;
 53#endif
 54
 55struct kvmppc_e500_tlb_params {
 56	int entries, ways, sets;
 57};
 58
 59struct kvmppc_vcpu_e500 {
 60	struct kvm_vcpu vcpu;
 61
 62	/* Unmodified copy of the guest's TLB -- shared with host userspace. */
 63	struct kvm_book3e_206_tlb_entry *gtlb_arch;
 64
 65	/* Starting entry number in gtlb_arch[] */
 66	int gtlb_offset[E500_TLB_NUM];
 67
 68	/* KVM internal information associated with each guest TLB entry */
 69	struct tlbe_priv *gtlb_priv[E500_TLB_NUM];
 70
 71	struct kvmppc_e500_tlb_params gtlb_params[E500_TLB_NUM];
 72
 73	unsigned int gtlb_nv[E500_TLB_NUM];
 74
 75	unsigned int host_tlb1_nv;
 76
 77	u32 svr;
 78	u32 l1csr0;
 79	u32 l1csr1;
 80	u32 hid0;
 81	u32 hid1;
 82	u64 mcar;
 83
 84	struct page **shared_tlb_pages;
 85	int num_shared_tlb_pages;
 86
 87	u64 *g2h_tlb1_map;
 88	unsigned int *h2g_tlb1_rmap;
 89
 90	/* Minimum and maximum address mapped my TLB1 */
 91	unsigned long tlb1_min_eaddr;
 92	unsigned long tlb1_max_eaddr;
 93
 94#ifdef CONFIG_KVM_E500V2
 95	u32 pid[E500_PID_NUM];
 96
 97	/* vcpu id table */
 98	struct vcpu_id_table *idt;
 99#endif
100};
101
102static inline struct kvmppc_vcpu_e500 *to_e500(struct kvm_vcpu *vcpu)
103{
104	return container_of(vcpu, struct kvmppc_vcpu_e500, vcpu);
105}
106
107
108/* This geometry is the legacy default -- can be overridden by userspace */
109#define KVM_E500_TLB0_WAY_SIZE		128
110#define KVM_E500_TLB0_WAY_NUM		2
111
112#define KVM_E500_TLB0_SIZE  (KVM_E500_TLB0_WAY_SIZE * KVM_E500_TLB0_WAY_NUM)
113#define KVM_E500_TLB1_SIZE  16
114
115#define index_of(tlbsel, esel)	(((tlbsel) << 16) | ((esel) & 0xFFFF))
116#define tlbsel_of(index)	((index) >> 16)
117#define esel_of(index)		((index) & 0xFFFF)
118
119#define E500_TLB_USER_PERM_MASK (MAS3_UX|MAS3_UR|MAS3_UW)
120#define E500_TLB_SUPER_PERM_MASK (MAS3_SX|MAS3_SR|MAS3_SW)
121#define MAS2_ATTRIB_MASK \
122	  (MAS2_X0 | MAS2_X1 | MAS2_E | MAS2_G)
123#define MAS3_ATTRIB_MASK \
124	  (MAS3_U0 | MAS3_U1 | MAS3_U2 | MAS3_U3 \
125	   | E500_TLB_USER_PERM_MASK | E500_TLB_SUPER_PERM_MASK)
126
127int kvmppc_e500_emul_mt_mmucsr0(struct kvmppc_vcpu_e500 *vcpu_e500,
128				ulong value);
129int kvmppc_e500_emul_tlbwe(struct kvm_vcpu *vcpu);
130int kvmppc_e500_emul_tlbre(struct kvm_vcpu *vcpu);
131int kvmppc_e500_emul_tlbivax(struct kvm_vcpu *vcpu, gva_t ea);
132int kvmppc_e500_emul_tlbilx(struct kvm_vcpu *vcpu, int type, gva_t ea);
133int kvmppc_e500_emul_tlbsx(struct kvm_vcpu *vcpu, gva_t ea);
134int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 *vcpu_e500);
135void kvmppc_e500_tlb_uninit(struct kvmppc_vcpu_e500 *vcpu_e500);
136
137void kvmppc_get_sregs_e500_tlb(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs);
138int kvmppc_set_sregs_e500_tlb(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs);
139
140int kvmppc_get_one_reg_e500_tlb(struct kvm_vcpu *vcpu, u64 id,
141				union kvmppc_one_reg *val);
142int kvmppc_set_one_reg_e500_tlb(struct kvm_vcpu *vcpu, u64 id,
143			       union kvmppc_one_reg *val);
144
145#ifdef CONFIG_KVM_E500V2
146unsigned int kvmppc_e500_get_sid(struct kvmppc_vcpu_e500 *vcpu_e500,
147				 unsigned int as, unsigned int gid,
148				 unsigned int pr, int avoid_recursion);
149#endif
150
151/* TLB helper functions */
152static inline unsigned int
153get_tlb_size(const struct kvm_book3e_206_tlb_entry *tlbe)
154{
155	return (tlbe->mas1 >> 7) & 0x1f;
156}
157
158static inline gva_t get_tlb_eaddr(const struct kvm_book3e_206_tlb_entry *tlbe)
159{
160	return tlbe->mas2 & MAS2_EPN;
161}
162
163static inline u64 get_tlb_bytes(const struct kvm_book3e_206_tlb_entry *tlbe)
164{
165	unsigned int pgsize = get_tlb_size(tlbe);
166	return 1ULL << 10 << pgsize;
167}
168
169static inline gva_t get_tlb_end(const struct kvm_book3e_206_tlb_entry *tlbe)
170{
171	u64 bytes = get_tlb_bytes(tlbe);
172	return get_tlb_eaddr(tlbe) + bytes - 1;
173}
174
175static inline u64 get_tlb_raddr(const struct kvm_book3e_206_tlb_entry *tlbe)
176{
177	return tlbe->mas7_3 & ~0xfffULL;
178}
179
180static inline unsigned int
181get_tlb_tid(const struct kvm_book3e_206_tlb_entry *tlbe)
182{
183	return (tlbe->mas1 >> 16) & 0xff;
184}
185
186static inline unsigned int
187get_tlb_ts(const struct kvm_book3e_206_tlb_entry *tlbe)
188{
189	return (tlbe->mas1 >> 12) & 0x1;
190}
191
192static inline unsigned int
193get_tlb_v(const struct kvm_book3e_206_tlb_entry *tlbe)
194{
195	return (tlbe->mas1 >> 31) & 0x1;
196}
197
198static inline unsigned int
199get_tlb_iprot(const struct kvm_book3e_206_tlb_entry *tlbe)
200{
201	return (tlbe->mas1 >> 30) & 0x1;
202}
203
204static inline unsigned int
205get_tlb_tsize(const struct kvm_book3e_206_tlb_entry *tlbe)
206{
207	return (tlbe->mas1 & MAS1_TSIZE_MASK) >> MAS1_TSIZE_SHIFT;
208}
209
210static inline unsigned int get_cur_pid(struct kvm_vcpu *vcpu)
211{
212	return vcpu->arch.pid & 0xff;
213}
214
215static inline unsigned int get_cur_as(struct kvm_vcpu *vcpu)
216{
217	return !!(vcpu->arch.shared->msr & (MSR_IS | MSR_DS));
218}
219
220static inline unsigned int get_cur_pr(struct kvm_vcpu *vcpu)
221{
222	return !!(vcpu->arch.shared->msr & MSR_PR);
223}
224
225static inline unsigned int get_cur_spid(const struct kvm_vcpu *vcpu)
226{
227	return (vcpu->arch.shared->mas6 >> 16) & 0xff;
228}
229
230static inline unsigned int get_cur_sas(const struct kvm_vcpu *vcpu)
231{
232	return vcpu->arch.shared->mas6 & 0x1;
233}
234
235static inline unsigned int get_tlb_tlbsel(const struct kvm_vcpu *vcpu)
236{
237	/*
238	 * Manual says that tlbsel has 2 bits wide.
239	 * Since we only have two TLBs, only lower bit is used.
240	 */
241	return (vcpu->arch.shared->mas0 >> 28) & 0x1;
242}
243
244static inline unsigned int get_tlb_nv_bit(const struct kvm_vcpu *vcpu)
245{
246	return vcpu->arch.shared->mas0 & 0xfff;
247}
248
249static inline unsigned int get_tlb_esel_bit(const struct kvm_vcpu *vcpu)
250{
251	return (vcpu->arch.shared->mas0 >> 16) & 0xfff;
252}
253
254static inline int tlbe_is_host_safe(const struct kvm_vcpu *vcpu,
255			const struct kvm_book3e_206_tlb_entry *tlbe)
256{
257	gpa_t gpa;
258
259	if (!get_tlb_v(tlbe))
260		return 0;
261
262#ifndef CONFIG_KVM_BOOKE_HV
263	/* Does it match current guest AS? */
264	/* XXX what about IS != DS? */
265	if (get_tlb_ts(tlbe) != !!(vcpu->arch.shared->msr & MSR_IS))
266		return 0;
267#endif
268
269	gpa = get_tlb_raddr(tlbe);
270	if (!gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT))
271		/* Mapping is not for RAM. */
272		return 0;
273
274	return 1;
275}
276
277static inline struct kvm_book3e_206_tlb_entry *get_entry(
278	struct kvmppc_vcpu_e500 *vcpu_e500, int tlbsel, int entry)
279{
280	int offset = vcpu_e500->gtlb_offset[tlbsel];
281	return &vcpu_e500->gtlb_arch[offset + entry];
282}
283
284void kvmppc_e500_tlbil_one(struct kvmppc_vcpu_e500 *vcpu_e500,
285			   struct kvm_book3e_206_tlb_entry *gtlbe);
286void kvmppc_e500_tlbil_all(struct kvmppc_vcpu_e500 *vcpu_e500);
287
288#ifdef CONFIG_KVM_BOOKE_HV
289#define kvmppc_e500_get_tlb_stid(vcpu, gtlbe)       get_tlb_tid(gtlbe)
290#define get_tlbmiss_tid(vcpu)           get_cur_pid(vcpu)
291#define get_tlb_sts(gtlbe)              (gtlbe->mas1 & MAS1_TS)
292
293/*
294 * These functions should be called with preemption disabled
295 * and the returned value is valid only in that context
296 */
297static inline int get_thread_specific_lpid(int vm_lpid)
298{
299	int vcpu_lpid = vm_lpid;
300
301	if (threads_per_core == 2)
302		vcpu_lpid |= smp_processor_id() & 1;
303
304	return vcpu_lpid;
305}
306
307static inline int get_lpid(struct kvm_vcpu *vcpu)
308{
309	return get_thread_specific_lpid(vcpu->kvm->arch.lpid);
310}
311#else
312unsigned int kvmppc_e500_get_tlb_stid(struct kvm_vcpu *vcpu,
313				      struct kvm_book3e_206_tlb_entry *gtlbe);
314
315static inline unsigned int get_tlbmiss_tid(struct kvm_vcpu *vcpu)
316{
317	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
318	unsigned int tidseld = (vcpu->arch.shared->mas4 >> 16) & 0xf;
319
320	return vcpu_e500->pid[tidseld];
321}
322
323/* Force TS=1 for all guest mappings. */
324#define get_tlb_sts(gtlbe)              (MAS1_TS)
325#endif /* !BOOKE_HV */
326
327static inline bool has_feature(const struct kvm_vcpu *vcpu,
328			       enum vcpu_ftr ftr)
329{
330	bool has_ftr;
331	switch (ftr) {
332	case VCPU_FTR_MMU_V2:
333		has_ftr = ((vcpu->arch.mmucfg & MMUCFG_MAVN) == MMUCFG_MAVN_V2);
334		break;
335	default:
336		return false;
337	}
338	return has_ftr;
339}
340
341#endif /* KVM_E500_H */