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Linux/arch/x86/mm/pageattr-test.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * self test for change_page_attr.
  4  *
  5  * Clears the a test pte bit on random pages in the direct mapping,
  6  * then reverts and compares page tables forwards and afterwards.
  7  */
  8 #include <linux/memblock.h>
  9 #include <linux/kthread.h>
 10 #include <linux/random.h>
 11 #include <linux/kernel.h>
 12 #include <linux/init.h>
 13 #include <linux/mm.h>
 14 #include <linux/vmalloc.h>
 15 
 16 #include <asm/cacheflush.h>
 17 #include <asm/pgtable.h>
 18 #include <asm/kdebug.h>
 19 
 20 /*
 21  * Only print the results of the first pass:
 22  */
 23 static __read_mostly int print = 1;
 24 
 25 enum {
 26         NTEST                   = 3 * 100,
 27         NPAGES                  = 100,
 28 #ifdef CONFIG_X86_64
 29         LPS                     = (1 << PMD_SHIFT),
 30 #elif defined(CONFIG_X86_PAE)
 31         LPS                     = (1 << PMD_SHIFT),
 32 #else
 33         LPS                     = (1 << 22),
 34 #endif
 35         GPS                     = (1<<30)
 36 };
 37 
 38 #define PAGE_CPA_TEST   __pgprot(_PAGE_CPA_TEST)
 39 
 40 static int pte_testbit(pte_t pte)
 41 {
 42         return pte_flags(pte) & _PAGE_SOFTW1;
 43 }
 44 
 45 struct split_state {
 46         long lpg, gpg, spg, exec;
 47         long min_exec, max_exec;
 48 };
 49 
 50 static int print_split(struct split_state *s)
 51 {
 52         long i, expected, missed = 0;
 53         int err = 0;
 54 
 55         s->lpg = s->gpg = s->spg = s->exec = 0;
 56         s->min_exec = ~0UL;
 57         s->max_exec = 0;
 58         for (i = 0; i < max_pfn_mapped; ) {
 59                 unsigned long addr = (unsigned long)__va(i << PAGE_SHIFT);
 60                 unsigned int level;
 61                 pte_t *pte;
 62 
 63                 pte = lookup_address(addr, &level);
 64                 if (!pte) {
 65                         missed++;
 66                         i++;
 67                         continue;
 68                 }
 69 
 70                 if (level == PG_LEVEL_1G && sizeof(long) == 8) {
 71                         s->gpg++;
 72                         i += GPS/PAGE_SIZE;
 73                 } else if (level == PG_LEVEL_2M) {
 74                         if ((pte_val(*pte) & _PAGE_PRESENT) && !(pte_val(*pte) & _PAGE_PSE)) {
 75                                 printk(KERN_ERR
 76                                         "%lx level %d but not PSE %Lx\n",
 77                                         addr, level, (u64)pte_val(*pte));
 78                                 err = 1;
 79                         }
 80                         s->lpg++;
 81                         i += LPS/PAGE_SIZE;
 82                 } else {
 83                         s->spg++;
 84                         i++;
 85                 }
 86                 if (!(pte_val(*pte) & _PAGE_NX)) {
 87                         s->exec++;
 88                         if (addr < s->min_exec)
 89                                 s->min_exec = addr;
 90                         if (addr > s->max_exec)
 91                                 s->max_exec = addr;
 92                 }
 93         }
 94         if (print) {
 95                 printk(KERN_INFO
 96                         " 4k %lu large %lu gb %lu x %lu[%lx-%lx] miss %lu\n",
 97                         s->spg, s->lpg, s->gpg, s->exec,
 98                         s->min_exec != ~0UL ? s->min_exec : 0,
 99                         s->max_exec, missed);
100         }
101 
102         expected = (s->gpg*GPS + s->lpg*LPS)/PAGE_SIZE + s->spg + missed;
103         if (expected != i) {
104                 printk(KERN_ERR "CPA max_pfn_mapped %lu but expected %lu\n",
105                         max_pfn_mapped, expected);
106                 return 1;
107         }
108         return err;
109 }
110 
111 static unsigned long addr[NTEST];
112 static unsigned int len[NTEST];
113 
114 static struct page *pages[NPAGES];
115 static unsigned long addrs[NPAGES];
116 
117 /* Change the global bit on random pages in the direct mapping */
118 static int pageattr_test(void)
119 {
120         struct split_state sa, sb, sc;
121         unsigned long *bm;
122         pte_t *pte, pte0;
123         int failed = 0;
124         unsigned int level;
125         int i, k;
126         int err;
127 
128         if (print)
129                 printk(KERN_INFO "CPA self-test:\n");
130 
131         bm = vzalloc((max_pfn_mapped + 7) / 8);
132         if (!bm) {
133                 printk(KERN_ERR "CPA Cannot vmalloc bitmap\n");
134                 return -ENOMEM;
135         }
136 
137         failed += print_split(&sa);
138 
139         for (i = 0; i < NTEST; i++) {
140                 unsigned long pfn = prandom_u32() % max_pfn_mapped;
141 
142                 addr[i] = (unsigned long)__va(pfn << PAGE_SHIFT);
143                 len[i] = prandom_u32() % NPAGES;
144                 len[i] = min_t(unsigned long, len[i], max_pfn_mapped - pfn - 1);
145 
146                 if (len[i] == 0)
147                         len[i] = 1;
148 
149                 pte = NULL;
150                 pte0 = pfn_pte(0, __pgprot(0)); /* shut gcc up */
151 
152                 for (k = 0; k < len[i]; k++) {
153                         pte = lookup_address(addr[i] + k*PAGE_SIZE, &level);
154                         if (!pte || pgprot_val(pte_pgprot(*pte)) == 0 ||
155                             !(pte_val(*pte) & _PAGE_PRESENT)) {
156                                 addr[i] = 0;
157                                 break;
158                         }
159                         if (k == 0) {
160                                 pte0 = *pte;
161                         } else {
162                                 if (pgprot_val(pte_pgprot(*pte)) !=
163                                         pgprot_val(pte_pgprot(pte0))) {
164                                         len[i] = k;
165                                         break;
166                                 }
167                         }
168                         if (test_bit(pfn + k, bm)) {
169                                 len[i] = k;
170                                 break;
171                         }
172                         __set_bit(pfn + k, bm);
173                         addrs[k] = addr[i] + k*PAGE_SIZE;
174                         pages[k] = pfn_to_page(pfn + k);
175                 }
176                 if (!addr[i] || !pte || !k) {
177                         addr[i] = 0;
178                         continue;
179                 }
180 
181                 switch (i % 3) {
182                 case 0:
183                         err = change_page_attr_set(&addr[i], len[i], PAGE_CPA_TEST, 0);
184                         break;
185 
186                 case 1:
187                         err = change_page_attr_set(addrs, len[1], PAGE_CPA_TEST, 1);
188                         break;
189 
190                 case 2:
191                         err = cpa_set_pages_array(pages, len[i], PAGE_CPA_TEST);
192                         break;
193                 }
194 
195 
196                 if (err < 0) {
197                         printk(KERN_ERR "CPA %d failed %d\n", i, err);
198                         failed++;
199                 }
200 
201                 pte = lookup_address(addr[i], &level);
202                 if (!pte || !pte_testbit(*pte) || pte_huge(*pte)) {
203                         printk(KERN_ERR "CPA %lx: bad pte %Lx\n", addr[i],
204                                 pte ? (u64)pte_val(*pte) : 0ULL);
205                         failed++;
206                 }
207                 if (level != PG_LEVEL_4K) {
208                         printk(KERN_ERR "CPA %lx: unexpected level %d\n",
209                                 addr[i], level);
210                         failed++;
211                 }
212 
213         }
214         vfree(bm);
215 
216         failed += print_split(&sb);
217 
218         for (i = 0; i < NTEST; i++) {
219                 if (!addr[i])
220                         continue;
221                 pte = lookup_address(addr[i], &level);
222                 if (!pte) {
223                         printk(KERN_ERR "CPA lookup of %lx failed\n", addr[i]);
224                         failed++;
225                         continue;
226                 }
227                 err = change_page_attr_clear(&addr[i], len[i], PAGE_CPA_TEST, 0);
228                 if (err < 0) {
229                         printk(KERN_ERR "CPA reverting failed: %d\n", err);
230                         failed++;
231                 }
232                 pte = lookup_address(addr[i], &level);
233                 if (!pte || pte_testbit(*pte)) {
234                         printk(KERN_ERR "CPA %lx: bad pte after revert %Lx\n",
235                                 addr[i], pte ? (u64)pte_val(*pte) : 0ULL);
236                         failed++;
237                 }
238 
239         }
240 
241         failed += print_split(&sc);
242 
243         if (failed) {
244                 WARN(1, KERN_ERR "NOT PASSED. Please report.\n");
245                 return -EINVAL;
246         } else {
247                 if (print)
248                         printk(KERN_INFO "ok.\n");
249         }
250 
251         return 0;
252 }
253 
254 static int do_pageattr_test(void *__unused)
255 {
256         while (!kthread_should_stop()) {
257                 schedule_timeout_interruptible(HZ*30);
258                 if (pageattr_test() < 0)
259                         break;
260                 if (print)
261                         print--;
262         }
263         return 0;
264 }
265 
266 static int start_pageattr_test(void)
267 {
268         struct task_struct *p;
269 
270         p = kthread_create(do_pageattr_test, NULL, "pageattr-test");
271         if (!IS_ERR(p))
272                 wake_up_process(p);
273         else
274                 WARN_ON(1);
275 
276         return 0;
277 }
278 device_initcall(start_pageattr_test);
279 

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