arch/powerpc/kvm/e500.h

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