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Linux/arch/x86/kernel/tboot.c

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  1 /*
  2  * tboot.c: main implementation of helper functions used by kernel for
  3  *          runtime support of Intel(R) Trusted Execution Technology
  4  *
  5  * Copyright (c) 2006-2009, Intel Corporation
  6  *
  7  * This program is free software; you can redistribute it and/or modify it
  8  * under the terms and conditions of the GNU General Public License,
  9  * version 2, as published by the Free Software Foundation.
 10  *
 11  * This program is distributed in the hope it will be useful, but WITHOUT
 12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 14  * more details.
 15  *
 16  * You should have received a copy of the GNU General Public License along with
 17  * this program; if not, write to the Free Software Foundation, Inc.,
 18  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 19  *
 20  */
 21 
 22 #include <linux/dma_remapping.h>
 23 #include <linux/init_task.h>
 24 #include <linux/spinlock.h>
 25 #include <linux/export.h>
 26 #include <linux/delay.h>
 27 #include <linux/sched.h>
 28 #include <linux/init.h>
 29 #include <linux/dmar.h>
 30 #include <linux/cpu.h>
 31 #include <linux/pfn.h>
 32 #include <linux/mm.h>
 33 #include <linux/tboot.h>
 34 #include <linux/debugfs.h>
 35 
 36 #include <asm/realmode.h>
 37 #include <asm/processor.h>
 38 #include <asm/bootparam.h>
 39 #include <asm/pgtable.h>
 40 #include <asm/pgalloc.h>
 41 #include <asm/swiotlb.h>
 42 #include <asm/fixmap.h>
 43 #include <asm/proto.h>
 44 #include <asm/setup.h>
 45 #include <asm/e820.h>
 46 #include <asm/io.h>
 47 
 48 #include "../realmode/rm/wakeup.h"
 49 
 50 /* Global pointer to shared data; NULL means no measured launch. */
 51 struct tboot *tboot __read_mostly;
 52 EXPORT_SYMBOL(tboot);
 53 
 54 /* timeout for APs (in secs) to enter wait-for-SIPI state during shutdown */
 55 #define AP_WAIT_TIMEOUT         1
 56 
 57 #undef pr_fmt
 58 #define pr_fmt(fmt)     "tboot: " fmt
 59 
 60 static u8 tboot_uuid[16] __initdata = TBOOT_UUID;
 61 
 62 void __init tboot_probe(void)
 63 {
 64         /* Look for valid page-aligned address for shared page. */
 65         if (!boot_params.tboot_addr)
 66                 return;
 67         /*
 68          * also verify that it is mapped as we expect it before calling
 69          * set_fixmap(), to reduce chance of garbage value causing crash
 70          */
 71         if (!e820_any_mapped(boot_params.tboot_addr,
 72                              boot_params.tboot_addr, E820_RESERVED)) {
 73                 pr_warning("non-0 tboot_addr but it is not of type E820_RESERVED\n");
 74                 return;
 75         }
 76 
 77         /* only a natively booted kernel should be using TXT */
 78         if (paravirt_enabled()) {
 79                 pr_warning("non-0 tboot_addr but pv_ops is enabled\n");
 80                 return;
 81         }
 82 
 83         /* Map and check for tboot UUID. */
 84         set_fixmap(FIX_TBOOT_BASE, boot_params.tboot_addr);
 85         tboot = (struct tboot *)fix_to_virt(FIX_TBOOT_BASE);
 86         if (memcmp(&tboot_uuid, &tboot->uuid, sizeof(tboot->uuid))) {
 87                 pr_warning("tboot at 0x%llx is invalid\n",
 88                            boot_params.tboot_addr);
 89                 tboot = NULL;
 90                 return;
 91         }
 92         if (tboot->version < 5) {
 93                 pr_warning("tboot version is invalid: %u\n", tboot->version);
 94                 tboot = NULL;
 95                 return;
 96         }
 97 
 98         pr_info("found shared page at phys addr 0x%llx:\n",
 99                 boot_params.tboot_addr);
100         pr_debug("version: %d\n", tboot->version);
101         pr_debug("log_addr: 0x%08x\n", tboot->log_addr);
102         pr_debug("shutdown_entry: 0x%x\n", tboot->shutdown_entry);
103         pr_debug("tboot_base: 0x%08x\n", tboot->tboot_base);
104         pr_debug("tboot_size: 0x%x\n", tboot->tboot_size);
105 }
106 
107 static pgd_t *tboot_pg_dir;
108 static struct mm_struct tboot_mm = {
109         .mm_rb          = RB_ROOT,
110         .pgd            = swapper_pg_dir,
111         .mm_users       = ATOMIC_INIT(2),
112         .mm_count       = ATOMIC_INIT(1),
113         .mmap_sem       = __RWSEM_INITIALIZER(init_mm.mmap_sem),
114         .page_table_lock =  __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock),
115         .mmlist         = LIST_HEAD_INIT(init_mm.mmlist),
116 };
117 
118 static inline void switch_to_tboot_pt(void)
119 {
120         write_cr3(virt_to_phys(tboot_pg_dir));
121 }
122 
123 static int map_tboot_page(unsigned long vaddr, unsigned long pfn,
124                           pgprot_t prot)
125 {
126         pgd_t *pgd;
127         pud_t *pud;
128         pmd_t *pmd;
129         pte_t *pte;
130 
131         pgd = pgd_offset(&tboot_mm, vaddr);
132         pud = pud_alloc(&tboot_mm, pgd, vaddr);
133         if (!pud)
134                 return -1;
135         pmd = pmd_alloc(&tboot_mm, pud, vaddr);
136         if (!pmd)
137                 return -1;
138         pte = pte_alloc_map(&tboot_mm, NULL, pmd, vaddr);
139         if (!pte)
140                 return -1;
141         set_pte_at(&tboot_mm, vaddr, pte, pfn_pte(pfn, prot));
142         pte_unmap(pte);
143         return 0;
144 }
145 
146 static int map_tboot_pages(unsigned long vaddr, unsigned long start_pfn,
147                            unsigned long nr)
148 {
149         /* Reuse the original kernel mapping */
150         tboot_pg_dir = pgd_alloc(&tboot_mm);
151         if (!tboot_pg_dir)
152                 return -1;
153 
154         for (; nr > 0; nr--, vaddr += PAGE_SIZE, start_pfn++) {
155                 if (map_tboot_page(vaddr, start_pfn, PAGE_KERNEL_EXEC))
156                         return -1;
157         }
158 
159         return 0;
160 }
161 
162 static void tboot_create_trampoline(void)
163 {
164         u32 map_base, map_size;
165 
166         /* Create identity map for tboot shutdown code. */
167         map_base = PFN_DOWN(tboot->tboot_base);
168         map_size = PFN_UP(tboot->tboot_size);
169         if (map_tboot_pages(map_base << PAGE_SHIFT, map_base, map_size))
170                 panic("tboot: Error mapping tboot pages (mfns) @ 0x%x, 0x%x\n",
171                       map_base, map_size);
172 }
173 
174 #ifdef CONFIG_ACPI_SLEEP
175 
176 static void add_mac_region(phys_addr_t start, unsigned long size)
177 {
178         struct tboot_mac_region *mr;
179         phys_addr_t end = start + size;
180 
181         if (tboot->num_mac_regions >= MAX_TB_MAC_REGIONS)
182                 panic("tboot: Too many MAC regions\n");
183 
184         if (start && size) {
185                 mr = &tboot->mac_regions[tboot->num_mac_regions++];
186                 mr->start = round_down(start, PAGE_SIZE);
187                 mr->size  = round_up(end, PAGE_SIZE) - mr->start;
188         }
189 }
190 
191 static int tboot_setup_sleep(void)
192 {
193         int i;
194 
195         tboot->num_mac_regions = 0;
196 
197         for (i = 0; i < e820.nr_map; i++) {
198                 if ((e820.map[i].type != E820_RAM)
199                  && (e820.map[i].type != E820_RESERVED_KERN))
200                         continue;
201 
202                 add_mac_region(e820.map[i].addr, e820.map[i].size);
203         }
204 
205         tboot->acpi_sinfo.kernel_s3_resume_vector =
206                 real_mode_header->wakeup_start;
207 
208         return 0;
209 }
210 
211 #else /* no CONFIG_ACPI_SLEEP */
212 
213 static int tboot_setup_sleep(void)
214 {
215         /* S3 shutdown requested, but S3 not supported by the kernel... */
216         BUG();
217         return -1;
218 }
219 
220 #endif
221 
222 void tboot_shutdown(u32 shutdown_type)
223 {
224         void (*shutdown)(void);
225 
226         if (!tboot_enabled())
227                 return;
228 
229         /*
230          * if we're being called before the 1:1 mapping is set up then just
231          * return and let the normal shutdown happen; this should only be
232          * due to very early panic()
233          */
234         if (!tboot_pg_dir)
235                 return;
236 
237         /* if this is S3 then set regions to MAC */
238         if (shutdown_type == TB_SHUTDOWN_S3)
239                 if (tboot_setup_sleep())
240                         return;
241 
242         tboot->shutdown_type = shutdown_type;
243 
244         switch_to_tboot_pt();
245 
246         shutdown = (void(*)(void))(unsigned long)tboot->shutdown_entry;
247         shutdown();
248 
249         /* should not reach here */
250         while (1)
251                 halt();
252 }
253 
254 static void tboot_copy_fadt(const struct acpi_table_fadt *fadt)
255 {
256 #define TB_COPY_GAS(tbg, g)                     \
257         tbg.space_id     = g.space_id;          \
258         tbg.bit_width    = g.bit_width;         \
259         tbg.bit_offset   = g.bit_offset;        \
260         tbg.access_width = g.access_width;      \
261         tbg.address      = g.address;
262 
263         TB_COPY_GAS(tboot->acpi_sinfo.pm1a_cnt_blk, fadt->xpm1a_control_block);
264         TB_COPY_GAS(tboot->acpi_sinfo.pm1b_cnt_blk, fadt->xpm1b_control_block);
265         TB_COPY_GAS(tboot->acpi_sinfo.pm1a_evt_blk, fadt->xpm1a_event_block);
266         TB_COPY_GAS(tboot->acpi_sinfo.pm1b_evt_blk, fadt->xpm1b_event_block);
267 
268         /*
269          * We need phys addr of waking vector, but can't use virt_to_phys() on
270          * &acpi_gbl_FACS because it is ioremap'ed, so calc from FACS phys
271          * addr.
272          */
273         tboot->acpi_sinfo.wakeup_vector = fadt->facs +
274                 offsetof(struct acpi_table_facs, firmware_waking_vector);
275 }
276 
277 static int tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control)
278 {
279         static u32 acpi_shutdown_map[ACPI_S_STATE_COUNT] = {
280                 /* S0,1,2: */ -1, -1, -1,
281                 /* S3: */ TB_SHUTDOWN_S3,
282                 /* S4: */ TB_SHUTDOWN_S4,
283                 /* S5: */ TB_SHUTDOWN_S5 };
284 
285         if (!tboot_enabled())
286                 return 0;
287 
288         tboot_copy_fadt(&acpi_gbl_FADT);
289         tboot->acpi_sinfo.pm1a_cnt_val = pm1a_control;
290         tboot->acpi_sinfo.pm1b_cnt_val = pm1b_control;
291         /* we always use the 32b wakeup vector */
292         tboot->acpi_sinfo.vector_width = 32;
293 
294         if (sleep_state >= ACPI_S_STATE_COUNT ||
295             acpi_shutdown_map[sleep_state] == -1) {
296                 pr_warning("unsupported sleep state 0x%x\n", sleep_state);
297                 return -1;
298         }
299 
300         tboot_shutdown(acpi_shutdown_map[sleep_state]);
301         return 0;
302 }
303 
304 static int tboot_extended_sleep(u8 sleep_state, u32 val_a, u32 val_b)
305 {
306         if (!tboot_enabled())
307                 return 0;
308 
309         pr_warning("tboot is not able to suspend on platforms with reduced hardware sleep (ACPIv5)");
310         return -ENODEV;
311 }
312 
313 static atomic_t ap_wfs_count;
314 
315 static int tboot_wait_for_aps(int num_aps)
316 {
317         unsigned long timeout;
318 
319         timeout = AP_WAIT_TIMEOUT*HZ;
320         while (atomic_read((atomic_t *)&tboot->num_in_wfs) != num_aps &&
321                timeout) {
322                 mdelay(1);
323                 timeout--;
324         }
325 
326         if (timeout)
327                 pr_warning("tboot wait for APs timeout\n");
328 
329         return !(atomic_read((atomic_t *)&tboot->num_in_wfs) == num_aps);
330 }
331 
332 static int tboot_cpu_callback(struct notifier_block *nfb, unsigned long action,
333                               void *hcpu)
334 {
335         switch (action) {
336         case CPU_DYING:
337                 atomic_inc(&ap_wfs_count);
338                 if (num_online_cpus() == 1)
339                         if (tboot_wait_for_aps(atomic_read(&ap_wfs_count)))
340                                 return NOTIFY_BAD;
341                 break;
342         }
343         return NOTIFY_OK;
344 }
345 
346 static struct notifier_block tboot_cpu_notifier =
347 {
348         .notifier_call = tboot_cpu_callback,
349 };
350 
351 #ifdef CONFIG_DEBUG_FS
352 
353 #define TBOOT_LOG_UUID  { 0x26, 0x25, 0x19, 0xc0, 0x30, 0x6b, 0xb4, 0x4d, \
354                           0x4c, 0x84, 0xa3, 0xe9, 0x53, 0xb8, 0x81, 0x74 }
355 
356 #define TBOOT_SERIAL_LOG_ADDR   0x60000
357 #define TBOOT_SERIAL_LOG_SIZE   0x08000
358 #define LOG_MAX_SIZE_OFF        16
359 #define LOG_BUF_OFF             24
360 
361 static uint8_t tboot_log_uuid[16] = TBOOT_LOG_UUID;
362 
363 static ssize_t tboot_log_read(struct file *file, char __user *user_buf, size_t count, loff_t *ppos)
364 {
365         void __iomem *log_base;
366         u8 log_uuid[16];
367         u32 max_size;
368         void *kbuf;
369         int ret = -EFAULT;
370 
371         log_base = ioremap_nocache(TBOOT_SERIAL_LOG_ADDR, TBOOT_SERIAL_LOG_SIZE);
372         if (!log_base)
373                 return ret;
374 
375         memcpy_fromio(log_uuid, log_base, sizeof(log_uuid));
376         if (memcmp(&tboot_log_uuid, log_uuid, sizeof(log_uuid)))
377                 goto err_iounmap;
378 
379         max_size = readl(log_base + LOG_MAX_SIZE_OFF);
380         if (*ppos >= max_size) {
381                 ret = 0;
382                 goto err_iounmap;
383         }
384 
385         if (*ppos + count > max_size)
386                 count = max_size - *ppos;
387 
388         kbuf = kmalloc(count, GFP_KERNEL);
389         if (!kbuf) {
390                 ret = -ENOMEM;
391                 goto err_iounmap;
392         }
393 
394         memcpy_fromio(kbuf, log_base + LOG_BUF_OFF + *ppos, count);
395         if (copy_to_user(user_buf, kbuf, count))
396                 goto err_kfree;
397 
398         *ppos += count;
399 
400         ret = count;
401 
402 err_kfree:
403         kfree(kbuf);
404 
405 err_iounmap:
406         iounmap(log_base);
407 
408         return ret;
409 }
410 
411 static const struct file_operations tboot_log_fops = {
412         .read   = tboot_log_read,
413         .llseek = default_llseek,
414 };
415 
416 #endif /* CONFIG_DEBUG_FS */
417 
418 static __init int tboot_late_init(void)
419 {
420         if (!tboot_enabled())
421                 return 0;
422 
423         tboot_create_trampoline();
424 
425         atomic_set(&ap_wfs_count, 0);
426         register_hotcpu_notifier(&tboot_cpu_notifier);
427 
428 #ifdef CONFIG_DEBUG_FS
429         debugfs_create_file("tboot_log", S_IRUSR,
430                         arch_debugfs_dir, NULL, &tboot_log_fops);
431 #endif
432 
433         acpi_os_set_prepare_sleep(&tboot_sleep);
434         acpi_os_set_prepare_extended_sleep(&tboot_extended_sleep);
435         return 0;
436 }
437 
438 late_initcall(tboot_late_init);
439 
440 /*
441  * TXT configuration registers (offsets from TXT_{PUB, PRIV}_CONFIG_REGS_BASE)
442  */
443 
444 #define TXT_PUB_CONFIG_REGS_BASE       0xfed30000
445 #define TXT_PRIV_CONFIG_REGS_BASE      0xfed20000
446 
447 /* # pages for each config regs space - used by fixmap */
448 #define NR_TXT_CONFIG_PAGES     ((TXT_PUB_CONFIG_REGS_BASE -                \
449                                   TXT_PRIV_CONFIG_REGS_BASE) >> PAGE_SHIFT)
450 
451 /* offsets from pub/priv config space */
452 #define TXTCR_HEAP_BASE             0x0300
453 #define TXTCR_HEAP_SIZE             0x0308
454 
455 #define SHA1_SIZE      20
456 
457 struct sha1_hash {
458         u8 hash[SHA1_SIZE];
459 };
460 
461 struct sinit_mle_data {
462         u32               version;             /* currently 6 */
463         struct sha1_hash  bios_acm_id;
464         u32               edx_senter_flags;
465         u64               mseg_valid;
466         struct sha1_hash  sinit_hash;
467         struct sha1_hash  mle_hash;
468         struct sha1_hash  stm_hash;
469         struct sha1_hash  lcp_policy_hash;
470         u32               lcp_policy_control;
471         u32               rlp_wakeup_addr;
472         u32               reserved;
473         u32               num_mdrs;
474         u32               mdrs_off;
475         u32               num_vtd_dmars;
476         u32               vtd_dmars_off;
477 } __packed;
478 
479 struct acpi_table_header *tboot_get_dmar_table(struct acpi_table_header *dmar_tbl)
480 {
481         void *heap_base, *heap_ptr, *config;
482 
483         if (!tboot_enabled())
484                 return dmar_tbl;
485 
486         /*
487          * ACPI tables may not be DMA protected by tboot, so use DMAR copy
488          * SINIT saved in SinitMleData in TXT heap (which is DMA protected)
489          */
490 
491         /* map config space in order to get heap addr */
492         config = ioremap(TXT_PUB_CONFIG_REGS_BASE, NR_TXT_CONFIG_PAGES *
493                          PAGE_SIZE);
494         if (!config)
495                 return NULL;
496 
497         /* now map TXT heap */
498         heap_base = ioremap(*(u64 *)(config + TXTCR_HEAP_BASE),
499                             *(u64 *)(config + TXTCR_HEAP_SIZE));
500         iounmap(config);
501         if (!heap_base)
502                 return NULL;
503 
504         /* walk heap to SinitMleData */
505         /* skip BiosData */
506         heap_ptr = heap_base + *(u64 *)heap_base;
507         /* skip OsMleData */
508         heap_ptr += *(u64 *)heap_ptr;
509         /* skip OsSinitData */
510         heap_ptr += *(u64 *)heap_ptr;
511         /* now points to SinitMleDataSize; set to SinitMleData */
512         heap_ptr += sizeof(u64);
513         /* get addr of DMAR table */
514         dmar_tbl = (struct acpi_table_header *)(heap_ptr +
515                    ((struct sinit_mle_data *)heap_ptr)->vtd_dmars_off -
516                    sizeof(u64));
517 
518         /* don't unmap heap because dmar.c needs access to this */
519 
520         return dmar_tbl;
521 }
522 
523 int tboot_force_iommu(void)
524 {
525         if (!tboot_enabled())
526                 return 0;
527 
528         if (no_iommu || swiotlb || dmar_disabled)
529                 pr_warning("Forcing Intel-IOMMU to enabled\n");
530 
531         dmar_disabled = 0;
532 #ifdef CONFIG_SWIOTLB
533         swiotlb = 0;
534 #endif
535         no_iommu = 0;
536 
537         return 1;
538 }
539 

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