hw/s390x/ipl.h

   1 /*
   2  * s390 IPL device
   3  *
   4  * Copyright 2015, 2020 IBM Corp.
   5  * Author(s): Zhang Fan <bjfanzh@cn.ibm.com>
   6  * Janosch Frank <frankja@linux.ibm.com>
   7  *
   8  * This work is licensed under the terms of the GNU GPL, version 2 or (at
   9  * your option) any later version. See the COPYING file in the top-level
  10  * directory.
  11  */
  12
  13 #ifndef HW_S390_IPL_H
  14 #define HW_S390_IPL_H
  15
  16 #include "cpu.h"
  17 #include "exec/address-spaces.h"
  18 #include "hw/qdev-core.h"
  19 #include "qom/object.h"
  20
  21 struct IPLBlockPVComp {
  22     uint64_t tweak_pref;
  23     uint64_t addr;
  24     uint64_t size;
  25 } QEMU_PACKED;
  26 typedef struct IPLBlockPVComp IPLBlockPVComp;
  27
  28 struct IPLBlockPV {
  29     uint8_t  reserved18[87];    /* 0x18 */
  30     uint8_t  version;           /* 0x6f */
  31     uint32_t reserved70;        /* 0x70 */
  32     uint32_t num_comp;          /* 0x74 */
  33     uint64_t pv_header_addr;    /* 0x78 */
  34     uint64_t pv_header_len;     /* 0x80 */
  35     struct IPLBlockPVComp components[0];
  36 } QEMU_PACKED;
  37 typedef struct IPLBlockPV IPLBlockPV;
  38
  39 struct IplBlockCcw {
  40     uint8_t  reserved0[85];
  41     uint8_t  ssid;
  42     uint16_t devno;
  43     uint8_t  vm_flags;
  44     uint8_t  reserved3[3];
  45     uint32_t vm_parm_len;
  46     uint8_t  nss_name[8];
  47     uint8_t  vm_parm[64];
  48     uint8_t  reserved4[8];
  49 } QEMU_PACKED;
  50 typedef struct IplBlockCcw IplBlockCcw;
  51
  52 struct IplBlockFcp {
  53     uint8_t  reserved1[305 - 1];
  54     uint8_t  opt;
  55     uint8_t  reserved2[3];
  56     uint16_t reserved3;
  57     uint16_t devno;
  58     uint8_t  reserved4[4];
  59     uint64_t wwpn;
  60     uint64_t lun;
  61     uint32_t bootprog;
  62     uint8_t  reserved5[12];
  63     uint64_t br_lba;
  64     uint32_t scp_data_len;
  65     uint8_t  reserved6[260];
  66     uint8_t  scp_data[0];
  67 } QEMU_PACKED;
  68 typedef struct IplBlockFcp IplBlockFcp;
  69
  70 struct IplBlockQemuScsi {
  71     uint32_t lun;
  72     uint16_t target;
  73     uint16_t channel;
  74     uint8_t  reserved0[77];
  75     uint8_t  ssid;
  76     uint16_t devno;
  77 } QEMU_PACKED;
  78 typedef struct IplBlockQemuScsi IplBlockQemuScsi;
  79
  80 #define DIAG308_FLAGS_LP_VALID 0x80
  81
  82 union IplParameterBlock {
  83     struct {
  84         uint32_t len;
  85         uint8_t  reserved0[3];
  86         uint8_t  version;
  87         uint32_t blk0_len;
  88         uint8_t  pbt;
  89         uint8_t  flags;
  90         uint16_t reserved01;
  91         uint8_t  loadparm[8];
  92         union {
  93             IplBlockCcw ccw;
  94             IplBlockFcp fcp;
  95             IPLBlockPV pv;
  96             IplBlockQemuScsi scsi;
  97         };
  98     } QEMU_PACKED;
  99     struct {
 100         uint8_t  reserved1[110];
 101         uint16_t devno;
 102         uint8_t  reserved2[88];
 103         uint8_t  reserved_ext[4096 - 200];
 104     } QEMU_PACKED;
 105 } QEMU_PACKED;
 106 typedef union IplParameterBlock IplParameterBlock;
 107
 108 int s390_ipl_set_loadparm(uint8_t *loadparm);
 109 void s390_ipl_update_diag308(IplParameterBlock *iplb);
 110 int s390_ipl_prepare_pv_header(void);
 111 int s390_ipl_pv_unpack(void);
 112 void s390_ipl_prepare_cpu(S390CPU *cpu);
 113 IplParameterBlock *s390_ipl_get_iplb(void);
 114 IplParameterBlock *s390_ipl_get_iplb_pv(void);
 115
 116 enum s390_reset {
 117     /* default is a reset not triggered by a CPU e.g. issued by QMP */
 118     S390_RESET_EXTERNAL = 0,
 119     S390_RESET_REIPL,
 120     S390_RESET_MODIFIED_CLEAR,
 121     S390_RESET_LOAD_NORMAL,
 122     S390_RESET_PV,
 123 };
 124 void s390_ipl_reset_request(CPUState *cs, enum s390_reset reset_type);
 125 void s390_ipl_get_reset_request(CPUState **cs, enum s390_reset *reset_type);
 126 void s390_ipl_clear_reset_request(void);
 127
 128 #define QIPL_ADDRESS  0xcc
 129
 130 /* Boot Menu flags */
 131 #define QIPL_FLAG_BM_OPTS_CMD   0x80
 132 #define QIPL_FLAG_BM_OPTS_ZIPL  0x40
 133
 134 /*
 135  * The QEMU IPL Parameters will be stored at absolute address
 136  * 204 (0xcc) which means it is 32-bit word aligned but not
 137  * double-word aligned.
 138  * Placement of data fields in this area must account for
 139  * their alignment needs. E.g., netboot_start_address must
 140  * have an offset of 4 + n * 8 bytes within the struct in order
 141  * to keep it double-word aligned.
 142  * The total size of the struct must never exceed 28 bytes.
 143  * This definition must be kept in sync with the definition
 144  * in pc-bios/s390-ccw/iplb.h.
 145  */
 146 struct QemuIplParameters {
 147     uint8_t  qipl_flags;
 148     uint8_t  reserved1[3];
 149     uint64_t netboot_start_addr;
 150     uint32_t boot_menu_timeout;
 151     uint8_t  reserved2[12];
 152 } QEMU_PACKED;
 153 typedef struct QemuIplParameters QemuIplParameters;
 154
 155 #define TYPE_S390_IPL "s390-ipl"
 156 OBJECT_DECLARE_SIMPLE_TYPE(S390IPLState, S390_IPL)
 157
 158 struct S390IPLState {
 159     /*< private >*/
 160     DeviceState parent_obj;
 161     IplParameterBlock iplb;
 162     IplParameterBlock iplb_pv;
 163     QemuIplParameters qipl;
 164     uint64_t start_addr;
 165     uint64_t compat_start_addr;
 166     uint64_t bios_start_addr;
 167     uint64_t compat_bios_start_addr;
 168     bool enforce_bios;
 169     bool iplb_valid;
 170     bool iplb_valid_pv;
 171     bool netboot;
 172     /* reset related properties don't have to be migrated or reset */
 173     enum s390_reset reset_type;
 174     int reset_cpu_index;
 175
 176     /*< public >*/
 177     char *kernel;
 178     char *initrd;
 179     char *cmdline;
 180     char *firmware;
 181     char *netboot_fw;
 182     uint8_t cssid;
 183     uint8_t ssid;
 184     uint16_t devno;
 185     bool iplbext_migration;
 186 };
 187 QEMU_BUILD_BUG_MSG(offsetof(S390IPLState, iplb) & 3, "alignment of iplb wrong");
 188
 189 #define DIAG_308_RC_OK              0x0001
 190 #define DIAG_308_RC_NO_CONF         0x0102
 191 #define DIAG_308_RC_INVALID         0x0402
 192 #define DIAG_308_RC_NO_PV_CONF      0x0902
 193 #define DIAG_308_RC_INVAL_FOR_PV    0x0a02
 194
 195 #define DIAG308_RESET_MOD_CLR       0
 196 #define DIAG308_RESET_LOAD_NORM     1
 197 #define DIAG308_LOAD_CLEAR          3
 198 #define DIAG308_LOAD_NORMAL_DUMP    4
 199 #define DIAG308_SET                 5
 200 #define DIAG308_STORE               6
 201 #define DIAG308_PV_SET              8
 202 #define DIAG308_PV_STORE            9
 203 #define DIAG308_PV_START            10
 204
 205 #define S390_IPL_TYPE_FCP 0x00
 206 #define S390_IPL_TYPE_CCW 0x02
 207 #define S390_IPL_TYPE_PV 0x05
 208 #define S390_IPL_TYPE_QEMU_SCSI 0xff
 209
 210 #define S390_IPLB_HEADER_LEN 8
 211 #define S390_IPLB_MIN_PV_LEN 148
 212 #define S390_IPLB_MIN_CCW_LEN 200
 213 #define S390_IPLB_MIN_FCP_LEN 384
 214 #define S390_IPLB_MIN_QEMU_SCSI_LEN 200
 215
 216 static inline bool iplb_valid_len(IplParameterBlock *iplb)
 217 {
 218     return be32_to_cpu(iplb->len) <= sizeof(IplParameterBlock);
 219 }
 220
 221 static inline bool ipl_valid_pv_components(IplParameterBlock *iplb)
 222 {
 223     IPLBlockPV *ipib_pv = &iplb->pv;
 224     int i;
 225
 226     if (ipib_pv->num_comp == 0) {
 227         return false;
 228     }
 229
 230     for (i = 0; i < ipib_pv->num_comp; i++) {
 231         /* Addr must be 4k aligned */
 232         if (ipib_pv->components[i].addr & ~TARGET_PAGE_MASK) {
 233             return false;
 234         }
 235
 236         /* Tweak prefix is monotonically increasing with each component */
 237         if (i < ipib_pv->num_comp - 1 &&
 238             ipib_pv->components[i].tweak_pref >=
 239             ipib_pv->components[i + 1].tweak_pref) {
 240             return false;
 241         }
 242     }
 243     return true;
 244 }
 245
 246 static inline bool ipl_valid_pv_header(IplParameterBlock *iplb)
 247 {
 248         IPLBlockPV *ipib_pv = &iplb->pv;
 249
 250         if (ipib_pv->pv_header_len > 2 * TARGET_PAGE_SIZE) {
 251             return false;
 252         }
 253
 254         if (!address_space_access_valid(&address_space_memory,
 255                                         ipib_pv->pv_header_addr,
 256                                         ipib_pv->pv_header_len,
 257                                         false,
 258                                         MEMTXATTRS_UNSPECIFIED)) {
 259             return false;
 260         }
 261
 262         return true;
 263 }
 264
 265 static inline bool iplb_valid_pv(IplParameterBlock *iplb)
 266 {
 267     if (iplb->pbt != S390_IPL_TYPE_PV ||
 268         be32_to_cpu(iplb->len) < S390_IPLB_MIN_PV_LEN) {
 269         return false;
 270     }
 271     if (!ipl_valid_pv_header(iplb)) {
 272         return false;
 273     }
 274     return ipl_valid_pv_components(iplb);
 275 }
 276
 277 static inline bool iplb_valid(IplParameterBlock *iplb)
 278 {
 279     switch (iplb->pbt) {
 280     case S390_IPL_TYPE_FCP:
 281         return be32_to_cpu(iplb->len) >= S390_IPLB_MIN_FCP_LEN;
 282     case S390_IPL_TYPE_CCW:
 283         return be32_to_cpu(iplb->len) >= S390_IPLB_MIN_CCW_LEN;
 284     default:
 285         return false;
 286     }
 287 }
 288
 289 #endif