arch/ia64/kvm/mmio.c

   1 /*
   2  * mmio.c: MMIO emulation components.
   3  * Copyright (c) 2004, Intel Corporation.
   4  *  Yaozu Dong (Eddie Dong) (Eddie.dong@intel.com)
   5  *  Kun Tian (Kevin Tian) (Kevin.tian@intel.com)
   6  *
   7  * Copyright (c) 2007 Intel Corporation  KVM support.
   8  * Xuefei Xu (Anthony Xu) (anthony.xu@intel.com)
   9  * Xiantao Zhang  (xiantao.zhang@intel.com)
  10  *
  11  * This program is free software; you can redistribute it and/or modify it
  12  * under the terms and conditions of the GNU General Public License,
  13  * version 2, as published by the Free Software Foundation.
  14  *
  15  * This program is distributed in the hope it will be useful, but WITHOUT
  16  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  17  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  18  * more details.
  19  *
  20  * You should have received a copy of the GNU General Public License along with
  21  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  22  * Place - Suite 330, Boston, MA 02111-1307 USA.
  23  *
  24  */
  25
  26 #include <linux/kvm_host.h>
  27
  28 #include "vcpu.h"
  29
  30 static void vlsapic_write_xtp(struct kvm_vcpu *v, uint8_t val)
  31 {
  32         VLSAPIC_XTP(v) = val;
  33 }
  34
  35 /*
  36  * LSAPIC OFFSET
  37  */
  38 #define PIB_LOW_HALF(ofst)     !(ofst & (1 << 20))
  39 #define PIB_OFST_INTA          0x1E0000
  40 #define PIB_OFST_XTP           0x1E0008
  41
  42 /*
  43  * execute write IPI op.
  44  */
  45 static void vlsapic_write_ipi(struct kvm_vcpu *vcpu,
  46                                         uint64_t addr, uint64_t data)
  47 {
  48         struct exit_ctl_data *p = &current_vcpu->arch.exit_data;
  49         unsigned long psr;
  50
  51         local_irq_save(psr);
  52
  53         p->exit_reason = EXIT_REASON_IPI;
  54         p->u.ipi_data.addr.val = addr;
  55         p->u.ipi_data.data.val = data;
  56         vmm_transition(current_vcpu);
  57
  58         local_irq_restore(psr);
  59
  60 }
  61
  62 void lsapic_write(struct kvm_vcpu *v, unsigned long addr,
  63                         unsigned long length, unsigned long val)
  64 {
  65         addr &= (PIB_SIZE - 1);
  66
  67         switch (addr) {
  68         case PIB_OFST_INTA:
  69                 panic_vm(v, "Undefined write on PIB INTA\n");
  70                 break;
  71         case PIB_OFST_XTP:
  72                 if (length == 1) {
  73                         vlsapic_write_xtp(v, val);
  74                 } else {
  75                         panic_vm(v, "Undefined write on PIB XTP\n");
  76                 }
  77                 break;
  78         default:
  79                 if (PIB_LOW_HALF(addr)) {
  80                         /*Lower half */
  81                         if (length != 8)
  82                                 panic_vm(v, "Can't LHF write with size %ld!\n",
  83                                                 length);
  84                         else
  85                                 vlsapic_write_ipi(v, addr, val);
  86                 } else {   /*Upper half */
  87                         panic_vm(v, "IPI-UHF write %lx\n", addr);
  88                 }
  89                 break;
  90         }
  91 }
  92
  93 unsigned long lsapic_read(struct kvm_vcpu *v, unsigned long addr,
  94                 unsigned long length)
  95 {
  96         uint64_t result = 0;
  97
  98         addr &= (PIB_SIZE - 1);
  99
 100         switch (addr) {
 101         case PIB_OFST_INTA:
 102                 if (length == 1) /* 1 byte load */
 103                         ; /* There is no i8259, there is no INTA access*/
 104                 else
 105                         panic_vm(v, "Undefined read on PIB INTA\n");
 106
 107                 break;
 108         case PIB_OFST_XTP:
 109                 if (length == 1) {
 110                         result = VLSAPIC_XTP(v);
 111                 } else {
 112                         panic_vm(v, "Undefined read on PIB XTP\n");
 113                 }
 114                 break;
 115         default:
 116                 panic_vm(v, "Undefined addr access for lsapic!\n");
 117                 break;
 118         }
 119         return result;
 120 }
 121
 122 static void mmio_access(struct kvm_vcpu *vcpu, u64 src_pa, u64 *dest,
 123                                         u16 s, int ma, int dir)
 124 {
 125         unsigned long iot;
 126         struct exit_ctl_data *p = &vcpu->arch.exit_data;
 127         unsigned long psr;
 128
 129         iot = __gpfn_is_io(src_pa >> PAGE_SHIFT);
 130
 131         local_irq_save(psr);
 132
 133         /*Intercept the access for PIB range*/
 134         if (iot == GPFN_PIB) {
 135                 if (!dir)
 136                         lsapic_write(vcpu, src_pa, s, *dest);
 137                 else
 138                         *dest = lsapic_read(vcpu, src_pa, s);
 139                 goto out;
 140         }
 141         p->exit_reason = EXIT_REASON_MMIO_INSTRUCTION;
 142         p->u.ioreq.addr = src_pa;
 143         p->u.ioreq.size = s;
 144         p->u.ioreq.dir = dir;
 145         if (dir == IOREQ_WRITE)
 146                 p->u.ioreq.data = *dest;
 147         p->u.ioreq.state = STATE_IOREQ_READY;
 148         vmm_transition(vcpu);
 149
 150         if (p->u.ioreq.state == STATE_IORESP_READY) {
 151                 if (dir == IOREQ_READ)
 152                         /* it's necessary to ensure zero extending */
 153                         *dest = p->u.ioreq.data & (~0UL >> (64-(s*8)));
 154         } else
 155                 panic_vm(vcpu, "Unhandled mmio access returned!\n");
 156 out:
 157         local_irq_restore(psr);
 158         return ;
 159 }
 160
 161 /*
 162    dir 1: read 0:write
 163    inst_type 0:integer 1:floating point
 164  */
 165 #define SL_INTEGER      0       /* store/load interger*/
 166 #define SL_FLOATING     1       /* store/load floating*/
 167
 168 void emulate_io_inst(struct kvm_vcpu *vcpu, u64 padr, u64 ma)
 169 {
 170         struct kvm_pt_regs *regs;
 171         IA64_BUNDLE bundle;
 172         int slot, dir = 0;
 173         int inst_type = -1;
 174         u16 size = 0;
 175         u64 data, slot1a, slot1b, temp, update_reg;
 176         s32 imm;
 177         INST64 inst;
 178
 179         regs = vcpu_regs(vcpu);
 180
 181         if (fetch_code(vcpu, regs->cr_iip, &bundle)) {
 182                 /* if fetch code fail, return and try again */
 183                 return;
 184         }
 185         slot = ((struct ia64_psr *)&(regs->cr_ipsr))->ri;
 186         if (!slot)
 187                 inst.inst = bundle.slot0;
 188         else if (slot == 1) {
 189                 slot1a = bundle.slot1a;
 190                 slot1b = bundle.slot1b;
 191                 inst.inst = slot1a + (slot1b << 18);
 192         } else if (slot == 2)
 193                 inst.inst = bundle.slot2;
 194
 195         /* Integer Load/Store */
 196         if (inst.M1.major == 4 && inst.M1.m == 0 && inst.M1.x == 0) {
 197                 inst_type = SL_INTEGER;
 198                 size = (inst.M1.x6 & 0x3);
 199                 if ((inst.M1.x6 >> 2) > 0xb) {
 200                         /*write*/
 201                         dir = IOREQ_WRITE;
 202                         data = vcpu_get_gr(vcpu, inst.M4.r2);
 203                 } else if ((inst.M1.x6 >> 2) < 0xb) {
 204                         /*read*/
 205                         dir = IOREQ_READ;
 206                 }
 207         } else if (inst.M2.major == 4 && inst.M2.m == 1 && inst.M2.x == 0) {
 208                 /* Integer Load + Reg update */
 209                 inst_type = SL_INTEGER;
 210                 dir = IOREQ_READ;
 211                 size = (inst.M2.x6 & 0x3);
 212                 temp = vcpu_get_gr(vcpu, inst.M2.r3);
 213                 update_reg = vcpu_get_gr(vcpu, inst.M2.r2);
 214                 temp += update_reg;
 215                 vcpu_set_gr(vcpu, inst.M2.r3, temp, 0);
 216         } else if (inst.M3.major == 5) {
 217                 /*Integer Load/Store + Imm update*/
 218                 inst_type = SL_INTEGER;
 219                 size = (inst.M3.x6&0x3);
 220                 if ((inst.M5.x6 >> 2) > 0xb) {
 221                         /*write*/
 222                         dir = IOREQ_WRITE;
 223                         data = vcpu_get_gr(vcpu, inst.M5.r2);
 224                         temp = vcpu_get_gr(vcpu, inst.M5.r3);
 225                         imm = (inst.M5.s << 31) | (inst.M5.i << 30) |
 226                                 (inst.M5.imm7 << 23);
 227                         temp += imm >> 23;
 228                         vcpu_set_gr(vcpu, inst.M5.r3, temp, 0);
 229
 230                 } else if ((inst.M3.x6 >> 2) < 0xb) {
 231                         /*read*/
 232                         dir = IOREQ_READ;
 233                         temp = vcpu_get_gr(vcpu, inst.M3.r3);
 234                         imm = (inst.M3.s << 31) | (inst.M3.i << 30) |
 235                                 (inst.M3.imm7 << 23);
 236                         temp += imm >> 23;
 237                         vcpu_set_gr(vcpu, inst.M3.r3, temp, 0);
 238
 239                 }
 240         } else if (inst.M9.major == 6 && inst.M9.x6 == 0x3B
 241                                 && inst.M9.m == 0 && inst.M9.x == 0) {
 242                 /* Floating-point spill*/
 243                 struct ia64_fpreg v;
 244
 245                 inst_type = SL_FLOATING;
 246                 dir = IOREQ_WRITE;
 247                 vcpu_get_fpreg(vcpu, inst.M9.f2, &v);
 248                 /* Write high word. FIXME: this is a kludge!  */
 249                 v.u.bits[1] &= 0x3ffff;
 250                 mmio_access(vcpu, padr + 8, (u64 *)&v.u.bits[1], 8,
 251                             ma, IOREQ_WRITE);
 252                 data = v.u.bits[0];
 253                 size = 3;
 254         } else if (inst.M10.major == 7 && inst.M10.x6 == 0x3B) {
 255                 /* Floating-point spill + Imm update */
 256                 struct ia64_fpreg v;
 257
 258                 inst_type = SL_FLOATING;
 259                 dir = IOREQ_WRITE;
 260                 vcpu_get_fpreg(vcpu, inst.M10.f2, &v);
 261                 temp = vcpu_get_gr(vcpu, inst.M10.r3);
 262                 imm = (inst.M10.s << 31) | (inst.M10.i << 30) |
 263                         (inst.M10.imm7 << 23);
 264                 temp += imm >> 23;
 265                 vcpu_set_gr(vcpu, inst.M10.r3, temp, 0);
 266
 267                 /* Write high word.FIXME: this is a kludge!  */
 268                 v.u.bits[1] &= 0x3ffff;
 269                 mmio_access(vcpu, padr + 8, (u64 *)&v.u.bits[1],
 270                             8, ma, IOREQ_WRITE);
 271                 data = v.u.bits[0];
 272                 size = 3;
 273         } else if (inst.M10.major == 7 && inst.M10.x6 == 0x31) {
 274                 /* Floating-point stf8 + Imm update */
 275                 struct ia64_fpreg v;
 276                 inst_type = SL_FLOATING;
 277                 dir = IOREQ_WRITE;
 278                 size = 3;
 279                 vcpu_get_fpreg(vcpu, inst.M10.f2, &v);
 280                 data = v.u.bits[0]; /* Significand.  */
 281                 temp = vcpu_get_gr(vcpu, inst.M10.r3);
 282                 imm = (inst.M10.s << 31) | (inst.M10.i << 30) |
 283                         (inst.M10.imm7 << 23);
 284                 temp += imm >> 23;
 285                 vcpu_set_gr(vcpu, inst.M10.r3, temp, 0);
 286         } else if (inst.M15.major == 7 && inst.M15.x6 >= 0x2c
 287                         && inst.M15.x6 <= 0x2f) {
 288                 temp = vcpu_get_gr(vcpu, inst.M15.r3);
 289                 imm = (inst.M15.s << 31) | (inst.M15.i << 30) |
 290                         (inst.M15.imm7 << 23);
 291                 temp += imm >> 23;
 292                 vcpu_set_gr(vcpu, inst.M15.r3, temp, 0);
 293
 294                 vcpu_increment_iip(vcpu);
 295                 return;
 296         } else if (inst.M12.major == 6 && inst.M12.m == 1
 297                         && inst.M12.x == 1 && inst.M12.x6 == 1) {
 298                 /* Floating-point Load Pair + Imm ldfp8 M12*/
 299                 struct ia64_fpreg v;
 300
 301                 inst_type = SL_FLOATING;
 302                 dir = IOREQ_READ;
 303                 size = 8;     /*ldfd*/
 304                 mmio_access(vcpu, padr, &data, size, ma, dir);
 305                 v.u.bits[0] = data;
 306                 v.u.bits[1] = 0x1003E;
 307                 vcpu_set_fpreg(vcpu, inst.M12.f1, &v);
 308                 padr += 8;
 309                 mmio_access(vcpu, padr, &data, size, ma, dir);
 310                 v.u.bits[0] = data;
 311                 v.u.bits[1] = 0x1003E;
 312                 vcpu_set_fpreg(vcpu, inst.M12.f2, &v);
 313                 padr += 8;
 314                 vcpu_set_gr(vcpu, inst.M12.r3, padr, 0);
 315                 vcpu_increment_iip(vcpu);
 316                 return;
 317         } else {
 318                 inst_type = -1;
 319                 panic_vm(vcpu, "Unsupported MMIO access instruction! "
 320                                 "Bunld[0]=0x%lx, Bundle[1]=0x%lx\n",
 321                                 bundle.i64[0], bundle.i64[1]);
 322         }
 323
 324         size = 1 << size;
 325         if (dir == IOREQ_WRITE) {
 326                 mmio_access(vcpu, padr, &data, size, ma, dir);
 327         } else {
 328                 mmio_access(vcpu, padr, &data, size, ma, dir);
 329                 if (inst_type == SL_INTEGER)
 330                         vcpu_set_gr(vcpu, inst.M1.r1, data, 0);
 331                 else
 332                         panic_vm(vcpu, "Unsupported instruction type!\n");
 333
 334         }
 335         vcpu_increment_iip(vcpu);
 336 }