arch/s390/include/asm/uv.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Ultravisor Interfaces
   4  *
   5  * Copyright IBM Corp. 2019
   6  *
   7  * Author(s):
   8  *      Vasily Gorbik <gor@linux.ibm.com>
   9  *      Janosch Frank <frankja@linux.ibm.com>
  10  */
  11 #ifndef _ASM_S390_UV_H
  12 #define _ASM_S390_UV_H
  13
  14 #include <linux/types.h>
  15 #include <linux/errno.h>
  16 #include <linux/bug.h>
  17 #include <linux/sched.h>
  18 #include <asm/page.h>
  19 #include <asm/gmap.h>
  20
  21 #define UVC_RC_EXECUTED         0x0001
  22 #define UVC_RC_INV_CMD          0x0002
  23 #define UVC_RC_INV_STATE        0x0003
  24 #define UVC_RC_INV_LEN          0x0005
  25 #define UVC_RC_NO_RESUME        0x0007
  26 #define UVC_RC_NEED_DESTROY     0x8000
  27
  28 #define UVC_CMD_QUI                     0x0001
  29 #define UVC_CMD_INIT_UV                 0x000f
  30 #define UVC_CMD_CREATE_SEC_CONF         0x0100
  31 #define UVC_CMD_DESTROY_SEC_CONF        0x0101
  32 #define UVC_CMD_CREATE_SEC_CPU          0x0120
  33 #define UVC_CMD_DESTROY_SEC_CPU         0x0121
  34 #define UVC_CMD_CONV_TO_SEC_STOR        0x0200
  35 #define UVC_CMD_CONV_FROM_SEC_STOR      0x0201
  36 #define UVC_CMD_DESTR_SEC_STOR          0x0202
  37 #define UVC_CMD_SET_SEC_CONF_PARAMS     0x0300
  38 #define UVC_CMD_UNPACK_IMG              0x0301
  39 #define UVC_CMD_VERIFY_IMG              0x0302
  40 #define UVC_CMD_CPU_RESET               0x0310
  41 #define UVC_CMD_CPU_RESET_INITIAL       0x0311
  42 #define UVC_CMD_PREPARE_RESET           0x0320
  43 #define UVC_CMD_CPU_RESET_CLEAR         0x0321
  44 #define UVC_CMD_CPU_SET_STATE           0x0330
  45 #define UVC_CMD_SET_UNSHARE_ALL         0x0340
  46 #define UVC_CMD_PIN_PAGE_SHARED         0x0341
  47 #define UVC_CMD_UNPIN_PAGE_SHARED       0x0342
  48 #define UVC_CMD_SET_SHARED_ACCESS       0x1000
  49 #define UVC_CMD_REMOVE_SHARED_ACCESS    0x1001
  50
  51 /* Bits in installed uv calls */
  52 enum uv_cmds_inst {
  53         BIT_UVC_CMD_QUI = 0,
  54         BIT_UVC_CMD_INIT_UV = 1,
  55         BIT_UVC_CMD_CREATE_SEC_CONF = 2,
  56         BIT_UVC_CMD_DESTROY_SEC_CONF = 3,
  57         BIT_UVC_CMD_CREATE_SEC_CPU = 4,
  58         BIT_UVC_CMD_DESTROY_SEC_CPU = 5,
  59         BIT_UVC_CMD_CONV_TO_SEC_STOR = 6,
  60         BIT_UVC_CMD_CONV_FROM_SEC_STOR = 7,
  61         BIT_UVC_CMD_SET_SHARED_ACCESS = 8,
  62         BIT_UVC_CMD_REMOVE_SHARED_ACCESS = 9,
  63         BIT_UVC_CMD_SET_SEC_PARMS = 11,
  64         BIT_UVC_CMD_UNPACK_IMG = 13,
  65         BIT_UVC_CMD_VERIFY_IMG = 14,
  66         BIT_UVC_CMD_CPU_RESET = 15,
  67         BIT_UVC_CMD_CPU_RESET_INITIAL = 16,
  68         BIT_UVC_CMD_CPU_SET_STATE = 17,
  69         BIT_UVC_CMD_PREPARE_RESET = 18,
  70         BIT_UVC_CMD_CPU_PERFORM_CLEAR_RESET = 19,
  71         BIT_UVC_CMD_UNSHARE_ALL = 20,
  72         BIT_UVC_CMD_PIN_PAGE_SHARED = 21,
  73         BIT_UVC_CMD_UNPIN_PAGE_SHARED = 22,
  74 };
  75
  76 enum uv_feat_ind {
  77         BIT_UV_FEAT_MISC = 0,
  78 };
  79
  80 struct uv_cb_header {
  81         u16 len;
  82         u16 cmd;        /* Command Code */
  83         u16 rc;         /* Response Code */
  84         u16 rrc;        /* Return Reason Code */
  85 } __packed __aligned(8);
  86
  87 /* Query Ultravisor Information */
  88 struct uv_cb_qui {
  89         struct uv_cb_header header;
  90         u64 reserved08;
  91         u64 inst_calls_list[4];
  92         u64 reserved30[2];
  93         u64 uv_base_stor_len;
  94         u64 reserved48;
  95         u64 conf_base_phys_stor_len;
  96         u64 conf_base_virt_stor_len;
  97         u64 conf_virt_var_stor_len;
  98         u64 cpu_stor_len;
  99         u32 reserved70[3];
 100         u32 max_num_sec_conf;
 101         u64 max_guest_stor_addr;
 102         u8  reserved88[158 - 136];
 103         u16 max_guest_cpu_id;
 104         u64 uv_feature_indications;
 105         u8  reserveda0[200 - 168];
 106 } __packed __aligned(8);
 107
 108 /* Initialize Ultravisor */
 109 struct uv_cb_init {
 110         struct uv_cb_header header;
 111         u64 reserved08[2];
 112         u64 stor_origin;
 113         u64 stor_len;
 114         u64 reserved28[4];
 115 } __packed __aligned(8);
 116
 117 /* Create Guest Configuration */
 118 struct uv_cb_cgc {
 119         struct uv_cb_header header;
 120         u64 reserved08[2];
 121         u64 guest_handle;
 122         u64 conf_base_stor_origin;
 123         u64 conf_virt_stor_origin;
 124         u64 reserved30;
 125         u64 guest_stor_origin;
 126         u64 guest_stor_len;
 127         u64 guest_sca;
 128         u64 guest_asce;
 129         u64 reserved58[5];
 130 } __packed __aligned(8);
 131
 132 /* Create Secure CPU */
 133 struct uv_cb_csc {
 134         struct uv_cb_header header;
 135         u64 reserved08[2];
 136         u64 cpu_handle;
 137         u64 guest_handle;
 138         u64 stor_origin;
 139         u8  reserved30[6];
 140         u16 num;
 141         u64 state_origin;
 142         u64 reserved40[4];
 143 } __packed __aligned(8);
 144
 145 /* Convert to Secure */
 146 struct uv_cb_cts {
 147         struct uv_cb_header header;
 148         u64 reserved08[2];
 149         u64 guest_handle;
 150         u64 gaddr;
 151 } __packed __aligned(8);
 152
 153 /* Convert from Secure / Pin Page Shared */
 154 struct uv_cb_cfs {
 155         struct uv_cb_header header;
 156         u64 reserved08[2];
 157         u64 paddr;
 158 } __packed __aligned(8);
 159
 160 /* Set Secure Config Parameter */
 161 struct uv_cb_ssc {
 162         struct uv_cb_header header;
 163         u64 reserved08[2];
 164         u64 guest_handle;
 165         u64 sec_header_origin;
 166         u32 sec_header_len;
 167         u32 reserved2c;
 168         u64 reserved30[4];
 169 } __packed __aligned(8);
 170
 171 /* Unpack */
 172 struct uv_cb_unp {
 173         struct uv_cb_header header;
 174         u64 reserved08[2];
 175         u64 guest_handle;
 176         u64 gaddr;
 177         u64 tweak[2];
 178         u64 reserved38[3];
 179 } __packed __aligned(8);
 180
 181 #define PV_CPU_STATE_OPR        1
 182 #define PV_CPU_STATE_STP        2
 183 #define PV_CPU_STATE_CHKSTP     3
 184 #define PV_CPU_STATE_OPR_LOAD   5
 185
 186 struct uv_cb_cpu_set_state {
 187         struct uv_cb_header header;
 188         u64 reserved08[2];
 189         u64 cpu_handle;
 190         u8  reserved20[7];
 191         u8  state;
 192         u64 reserved28[5];
 193 };
 194
 195 /*
 196  * A common UV call struct for calls that take no payload
 197  * Examples:
 198  * Destroy cpu/config
 199  * Verify
 200  */
 201 struct uv_cb_nodata {
 202         struct uv_cb_header header;
 203         u64 reserved08[2];
 204         u64 handle;
 205         u64 reserved20[4];
 206 } __packed __aligned(8);
 207
 208 /* Set Shared Access */
 209 struct uv_cb_share {
 210         struct uv_cb_header header;
 211         u64 reserved08[3];
 212         u64 paddr;
 213         u64 reserved28;
 214 } __packed __aligned(8);
 215
 216 static inline int __uv_call(unsigned long r1, unsigned long r2)
 217 {
 218         int cc;
 219
 220         asm volatile(
 221                 "       .insn rrf,0xB9A40000,%[r1],%[r2],0,0\n"
 222                 "       ipm     %[cc]\n"
 223                 "       srl     %[cc],28\n"
 224                 : [cc] "=d" (cc)
 225                 : [r1] "a" (r1), [r2] "a" (r2)
 226                 : "memory", "cc");
 227         return cc;
 228 }
 229
 230 static inline int uv_call(unsigned long r1, unsigned long r2)
 231 {
 232         int cc;
 233
 234         do {
 235                 cc = __uv_call(r1, r2);
 236         } while (cc > 1);
 237         return cc;
 238 }
 239
 240 /* Low level uv_call that avoids stalls for long running busy conditions  */
 241 static inline int uv_call_sched(unsigned long r1, unsigned long r2)
 242 {
 243         int cc;
 244
 245         do {
 246                 cc = __uv_call(r1, r2);
 247                 cond_resched();
 248         } while (cc > 1);
 249         return cc;
 250 }
 251
 252 /*
 253  * special variant of uv_call that only transports the cpu or guest
 254  * handle and the command, like destroy or verify.
 255  */
 256 static inline int uv_cmd_nodata(u64 handle, u16 cmd, u16 *rc, u16 *rrc)
 257 {
 258         struct uv_cb_nodata uvcb = {
 259                 .header.cmd = cmd,
 260                 .header.len = sizeof(uvcb),
 261                 .handle = handle,
 262         };
 263         int cc;
 264
 265         WARN(!handle, "No handle provided to Ultravisor call cmd %x\n", cmd);
 266         cc = uv_call_sched(0, (u64)&uvcb);
 267         *rc = uvcb.header.rc;
 268         *rrc = uvcb.header.rrc;
 269         return cc ? -EINVAL : 0;
 270 }
 271
 272 struct uv_info {
 273         unsigned long inst_calls_list[4];
 274         unsigned long uv_base_stor_len;
 275         unsigned long guest_base_stor_len;
 276         unsigned long guest_virt_base_stor_len;
 277         unsigned long guest_virt_var_stor_len;
 278         unsigned long guest_cpu_stor_len;
 279         unsigned long max_sec_stor_addr;
 280         unsigned int max_num_sec_conf;
 281         unsigned short max_guest_cpu_id;
 282         unsigned long uv_feature_indications;
 283 };
 284
 285 extern struct uv_info uv_info;
 286
 287 #ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
 288 extern int prot_virt_guest;
 289
 290 static inline int is_prot_virt_guest(void)
 291 {
 292         return prot_virt_guest;
 293 }
 294
 295 static inline int share(unsigned long addr, u16 cmd)
 296 {
 297         struct uv_cb_share uvcb = {
 298                 .header.cmd = cmd,
 299                 .header.len = sizeof(uvcb),
 300                 .paddr = addr
 301         };
 302
 303         if (!is_prot_virt_guest())
 304                 return -EOPNOTSUPP;
 305         /*
 306          * Sharing is page wise, if we encounter addresses that are
 307          * not page aligned, we assume something went wrong. If
 308          * malloced structs are passed to this function, we could leak
 309          * data to the hypervisor.
 310          */
 311         BUG_ON(addr & ~PAGE_MASK);
 312
 313         if (!uv_call(0, (u64)&uvcb))
 314                 return 0;
 315         return -EINVAL;
 316 }
 317
 318 /*
 319  * Guest 2 request to the Ultravisor to make a page shared with the
 320  * hypervisor for IO.
 321  *
 322  * @addr: Real or absolute address of the page to be shared
 323  */
 324 static inline int uv_set_shared(unsigned long addr)
 325 {
 326         return share(addr, UVC_CMD_SET_SHARED_ACCESS);
 327 }
 328
 329 /*
 330  * Guest 2 request to the Ultravisor to make a page unshared.
 331  *
 332  * @addr: Real or absolute address of the page to be unshared
 333  */
 334 static inline int uv_remove_shared(unsigned long addr)
 335 {
 336         return share(addr, UVC_CMD_REMOVE_SHARED_ACCESS);
 337 }
 338
 339 #else
 340 #define is_prot_virt_guest() 0
 341 static inline int uv_set_shared(unsigned long addr) { return 0; }
 342 static inline int uv_remove_shared(unsigned long addr) { return 0; }
 343 #endif
 344
 345 #if IS_ENABLED(CONFIG_KVM)
 346 extern int prot_virt_host;
 347
 348 static inline int is_prot_virt_host(void)
 349 {
 350         return prot_virt_host;
 351 }
 352
 353 int gmap_make_secure(struct gmap *gmap, unsigned long gaddr, void *uvcb);
 354 int uv_destroy_page(unsigned long paddr);
 355 int uv_convert_from_secure(unsigned long paddr);
 356 int gmap_convert_to_secure(struct gmap *gmap, unsigned long gaddr);
 357
 358 void setup_uv(void);
 359 #else
 360 #define is_prot_virt_host() 0
 361 static inline void setup_uv(void) {}
 362
 363 static inline int uv_destroy_page(unsigned long paddr)
 364 {
 365         return 0;
 366 }
 367
 368 static inline int uv_convert_from_secure(unsigned long paddr)
 369 {
 370         return 0;
 371 }
 372 #endif
 373
 374 #endif /* _ASM_S390_UV_H */