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Linux kernel mirror (for testing)
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1/*
2 * Copyright (C) 2008-2011 Freescale Semiconductor, Inc. All rights reserved.
3 *
4 * Author: Yu Liu, yu.liu@freescale.com
5 *
6 * Description:
7 * This file is based on arch/powerpc/kvm/44x_tlb.h,
8 * by Hollis Blanchard <hollisb@us.ibm.com>.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License, version 2, as
12 * published by the Free Software Foundation.
13 */
14
15#ifndef __KVM_E500_TLB_H__
16#define __KVM_E500_TLB_H__
17
18#include <linux/kvm_host.h>
19#include <asm/mmu-book3e.h>
20#include <asm/tlb.h>
21#include <asm/kvm_e500.h>
22
23/* This geometry is the legacy default -- can be overridden by userspace */
24#define KVM_E500_TLB0_WAY_SIZE 128
25#define KVM_E500_TLB0_WAY_NUM 2
26
27#define KVM_E500_TLB0_SIZE (KVM_E500_TLB0_WAY_SIZE * KVM_E500_TLB0_WAY_NUM)
28#define KVM_E500_TLB1_SIZE 16
29
30#define index_of(tlbsel, esel) (((tlbsel) << 16) | ((esel) & 0xFFFF))
31#define tlbsel_of(index) ((index) >> 16)
32#define esel_of(index) ((index) & 0xFFFF)
33
34#define E500_TLB_USER_PERM_MASK (MAS3_UX|MAS3_UR|MAS3_UW)
35#define E500_TLB_SUPER_PERM_MASK (MAS3_SX|MAS3_SR|MAS3_SW)
36#define MAS2_ATTRIB_MASK \
37 (MAS2_X0 | MAS2_X1)
38#define MAS3_ATTRIB_MASK \
39 (MAS3_U0 | MAS3_U1 | MAS3_U2 | MAS3_U3 \
40 | E500_TLB_USER_PERM_MASK | E500_TLB_SUPER_PERM_MASK)
41
42extern void kvmppc_dump_tlbs(struct kvm_vcpu *);
43extern int kvmppc_e500_emul_mt_mmucsr0(struct kvmppc_vcpu_e500 *, ulong);
44extern int kvmppc_e500_emul_tlbwe(struct kvm_vcpu *);
45extern int kvmppc_e500_emul_tlbre(struct kvm_vcpu *);
46extern int kvmppc_e500_emul_tlbivax(struct kvm_vcpu *, int, int);
47extern int kvmppc_e500_emul_tlbsx(struct kvm_vcpu *, int);
48extern int kvmppc_e500_tlb_search(struct kvm_vcpu *, gva_t, unsigned int, int);
49extern void kvmppc_e500_tlb_put(struct kvm_vcpu *);
50extern void kvmppc_e500_tlb_load(struct kvm_vcpu *, int);
51extern int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 *);
52extern void kvmppc_e500_tlb_uninit(struct kvmppc_vcpu_e500 *);
53extern void kvmppc_e500_tlb_setup(struct kvmppc_vcpu_e500 *);
54extern void kvmppc_e500_recalc_shadow_pid(struct kvmppc_vcpu_e500 *);
55
56/* TLB helper functions */
57static inline unsigned int
58get_tlb_size(const struct kvm_book3e_206_tlb_entry *tlbe)
59{
60 return (tlbe->mas1 >> 7) & 0x1f;
61}
62
63static inline gva_t get_tlb_eaddr(const struct kvm_book3e_206_tlb_entry *tlbe)
64{
65 return tlbe->mas2 & 0xfffff000;
66}
67
68static inline u64 get_tlb_bytes(const struct kvm_book3e_206_tlb_entry *tlbe)
69{
70 unsigned int pgsize = get_tlb_size(tlbe);
71 return 1ULL << 10 << pgsize;
72}
73
74static inline gva_t get_tlb_end(const struct kvm_book3e_206_tlb_entry *tlbe)
75{
76 u64 bytes = get_tlb_bytes(tlbe);
77 return get_tlb_eaddr(tlbe) + bytes - 1;
78}
79
80static inline u64 get_tlb_raddr(const struct kvm_book3e_206_tlb_entry *tlbe)
81{
82 return tlbe->mas7_3 & ~0xfffULL;
83}
84
85static inline unsigned int
86get_tlb_tid(const struct kvm_book3e_206_tlb_entry *tlbe)
87{
88 return (tlbe->mas1 >> 16) & 0xff;
89}
90
91static inline unsigned int
92get_tlb_ts(const struct kvm_book3e_206_tlb_entry *tlbe)
93{
94 return (tlbe->mas1 >> 12) & 0x1;
95}
96
97static inline unsigned int
98get_tlb_v(const struct kvm_book3e_206_tlb_entry *tlbe)
99{
100 return (tlbe->mas1 >> 31) & 0x1;
101}
102
103static inline unsigned int
104get_tlb_iprot(const struct kvm_book3e_206_tlb_entry *tlbe)
105{
106 return (tlbe->mas1 >> 30) & 0x1;
107}
108
109static inline unsigned int get_cur_pid(struct kvm_vcpu *vcpu)
110{
111 return vcpu->arch.pid & 0xff;
112}
113
114static inline unsigned int get_cur_as(struct kvm_vcpu *vcpu)
115{
116 return !!(vcpu->arch.shared->msr & (MSR_IS | MSR_DS));
117}
118
119static inline unsigned int get_cur_pr(struct kvm_vcpu *vcpu)
120{
121 return !!(vcpu->arch.shared->msr & MSR_PR);
122}
123
124static inline unsigned int get_cur_spid(const struct kvm_vcpu *vcpu)
125{
126 return (vcpu->arch.shared->mas6 >> 16) & 0xff;
127}
128
129static inline unsigned int get_cur_sas(const struct kvm_vcpu *vcpu)
130{
131 return vcpu->arch.shared->mas6 & 0x1;
132}
133
134static inline unsigned int get_tlb_tlbsel(const struct kvm_vcpu *vcpu)
135{
136 /*
137 * Manual says that tlbsel has 2 bits wide.
138 * Since we only have two TLBs, only lower bit is used.
139 */
140 return (vcpu->arch.shared->mas0 >> 28) & 0x1;
141}
142
143static inline unsigned int get_tlb_nv_bit(const struct kvm_vcpu *vcpu)
144{
145 return vcpu->arch.shared->mas0 & 0xfff;
146}
147
148static inline unsigned int get_tlb_esel_bit(const struct kvm_vcpu *vcpu)
149{
150 return (vcpu->arch.shared->mas0 >> 16) & 0xfff;
151}
152
153static inline int tlbe_is_host_safe(const struct kvm_vcpu *vcpu,
154 const struct kvm_book3e_206_tlb_entry *tlbe)
155{
156 gpa_t gpa;
157
158 if (!get_tlb_v(tlbe))
159 return 0;
160
161 /* Does it match current guest AS? */
162 /* XXX what about IS != DS? */
163 if (get_tlb_ts(tlbe) != !!(vcpu->arch.shared->msr & MSR_IS))
164 return 0;
165
166 gpa = get_tlb_raddr(tlbe);
167 if (!gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT))
168 /* Mapping is not for RAM. */
169 return 0;
170
171 return 1;
172}
173
174#endif /* __KVM_E500_TLB_H__ */