Commit | Line | Data |
---|---|---|
fa2d8369 AK |
1 | /* |
2 | * self test for change_page_attr. | |
3 | * | |
5a654ba7 JF |
4 | * Clears the a test pte bit on random pages in the direct mapping, |
5 | * then reverts and compares page tables forwards and afterwards. | |
fa2d8369 | 6 | */ |
851339b1 | 7 | #include <linux/bootmem.h> |
971a52d6 | 8 | #include <linux/kthread.h> |
fa2d8369 AK |
9 | #include <linux/random.h> |
10 | #include <linux/kernel.h> | |
851339b1 IM |
11 | #include <linux/mm.h> |
12 | ||
fa2d8369 AK |
13 | #include <asm/cacheflush.h> |
14 | #include <asm/pgtable.h> | |
15 | #include <asm/kdebug.h> | |
16 | ||
971a52d6 IM |
17 | /* |
18 | * Only print the results of the first pass: | |
19 | */ | |
20 | static __read_mostly int print = 1; | |
21 | ||
fa2d8369 | 22 | enum { |
971a52d6 | 23 | NTEST = 400, |
fa2d8369 | 24 | #ifdef CONFIG_X86_64 |
851339b1 | 25 | LPS = (1 << PMD_SHIFT), |
fa2d8369 | 26 | #elif defined(CONFIG_X86_PAE) |
851339b1 | 27 | LPS = (1 << PMD_SHIFT), |
fa2d8369 | 28 | #else |
851339b1 | 29 | LPS = (1 << 22), |
fa2d8369 | 30 | #endif |
851339b1 | 31 | GPS = (1<<30) |
fa2d8369 AK |
32 | }; |
33 | ||
110e0358 | 34 | #define PAGE_CPA_TEST __pgprot(_PAGE_CPA_TEST) |
5a654ba7 JF |
35 | |
36 | static int pte_testbit(pte_t pte) | |
37 | { | |
c46a7c81 | 38 | return pte_flags(pte) & _PAGE_SOFTW1; |
5a654ba7 JF |
39 | } |
40 | ||
fa2d8369 AK |
41 | struct split_state { |
42 | long lpg, gpg, spg, exec; | |
43 | long min_exec, max_exec; | |
44 | }; | |
45 | ||
971a52d6 | 46 | static int print_split(struct split_state *s) |
fa2d8369 | 47 | { |
fa2d8369 AK |
48 | long i, expected, missed = 0; |
49 | int err = 0; | |
50 | ||
51 | s->lpg = s->gpg = s->spg = s->exec = 0; | |
52 | s->min_exec = ~0UL; | |
53 | s->max_exec = 0; | |
f87519e8 | 54 | for (i = 0; i < max_pfn_mapped; ) { |
851339b1 | 55 | unsigned long addr = (unsigned long)__va(i << PAGE_SHIFT); |
93809be8 | 56 | unsigned int level; |
fa2d8369 | 57 | pte_t *pte; |
fa2d8369 | 58 | |
851339b1 | 59 | pte = lookup_address(addr, &level); |
fa2d8369 | 60 | if (!pte) { |
fa2d8369 AK |
61 | missed++; |
62 | i++; | |
63 | continue; | |
64 | } | |
65 | ||
86f03989 | 66 | if (level == PG_LEVEL_1G && sizeof(long) == 8) { |
fa2d8369 AK |
67 | s->gpg++; |
68 | i += GPS/PAGE_SIZE; | |
86f03989 | 69 | } else if (level == PG_LEVEL_2M) { |
18699739 | 70 | if ((pte_val(*pte) & _PAGE_PRESENT) && !(pte_val(*pte) & _PAGE_PSE)) { |
851339b1 IM |
71 | printk(KERN_ERR |
72 | "%lx level %d but not PSE %Lx\n", | |
73 | addr, level, (u64)pte_val(*pte)); | |
fa2d8369 AK |
74 | err = 1; |
75 | } | |
76 | s->lpg++; | |
77 | i += LPS/PAGE_SIZE; | |
78 | } else { | |
79 | s->spg++; | |
80 | i++; | |
81 | } | |
82 | if (!(pte_val(*pte) & _PAGE_NX)) { | |
83 | s->exec++; | |
851339b1 IM |
84 | if (addr < s->min_exec) |
85 | s->min_exec = addr; | |
86 | if (addr > s->max_exec) | |
87 | s->max_exec = addr; | |
fa2d8369 AK |
88 | } |
89 | } | |
971a52d6 IM |
90 | if (print) { |
91 | printk(KERN_INFO | |
92 | " 4k %lu large %lu gb %lu x %lu[%lx-%lx] miss %lu\n", | |
93 | s->spg, s->lpg, s->gpg, s->exec, | |
94 | s->min_exec != ~0UL ? s->min_exec : 0, | |
95 | s->max_exec, missed); | |
96 | } | |
851339b1 | 97 | |
fa2d8369 AK |
98 | expected = (s->gpg*GPS + s->lpg*LPS)/PAGE_SIZE + s->spg + missed; |
99 | if (expected != i) { | |
f87519e8 TG |
100 | printk(KERN_ERR "CPA max_pfn_mapped %lu but expected %lu\n", |
101 | max_pfn_mapped, expected); | |
fa2d8369 AK |
102 | return 1; |
103 | } | |
104 | return err; | |
105 | } | |
106 | ||
971a52d6 IM |
107 | static unsigned long addr[NTEST]; |
108 | static unsigned int len[NTEST]; | |
fa2d8369 AK |
109 | |
110 | /* Change the global bit on random pages in the direct mapping */ | |
971a52d6 | 111 | static int pageattr_test(void) |
fa2d8369 | 112 | { |
851339b1 IM |
113 | struct split_state sa, sb, sc; |
114 | unsigned long *bm; | |
fa2d8369 | 115 | pte_t *pte, pte0; |
851339b1 | 116 | int failed = 0; |
93809be8 | 117 | unsigned int level; |
851339b1 | 118 | int i, k; |
fa2d8369 | 119 | int err; |
ab7e7924 | 120 | unsigned long test_addr; |
fa2d8369 | 121 | |
971a52d6 IM |
122 | if (print) |
123 | printk(KERN_INFO "CPA self-test:\n"); | |
fa2d8369 | 124 | |
c4d017f2 | 125 | bm = vzalloc((max_pfn_mapped + 7) / 8); |
fa2d8369 | 126 | if (!bm) { |
851339b1 | 127 | printk(KERN_ERR "CPA Cannot vmalloc bitmap\n"); |
fa2d8369 AK |
128 | return -ENOMEM; |
129 | } | |
fa2d8369 AK |
130 | |
131 | failed += print_split(&sa); | |
851339b1 | 132 | |
fa2d8369 | 133 | for (i = 0; i < NTEST; i++) { |
56a1ba5f | 134 | unsigned long pfn = prandom_u32() % max_pfn_mapped; |
851339b1 | 135 | |
fa2d8369 | 136 | addr[i] = (unsigned long)__va(pfn << PAGE_SHIFT); |
56a1ba5f | 137 | len[i] = prandom_u32() % 100; |
f87519e8 | 138 | len[i] = min_t(unsigned long, len[i], max_pfn_mapped - pfn - 1); |
851339b1 | 139 | |
fa2d8369 AK |
140 | if (len[i] == 0) |
141 | len[i] = 1; | |
142 | ||
143 | pte = NULL; | |
144 | pte0 = pfn_pte(0, __pgprot(0)); /* shut gcc up */ | |
851339b1 | 145 | |
fa2d8369 AK |
146 | for (k = 0; k < len[i]; k++) { |
147 | pte = lookup_address(addr[i] + k*PAGE_SIZE, &level); | |
64f351d1 TG |
148 | if (!pte || pgprot_val(pte_pgprot(*pte)) == 0 || |
149 | !(pte_val(*pte) & _PAGE_PRESENT)) { | |
fa2d8369 AK |
150 | addr[i] = 0; |
151 | break; | |
152 | } | |
851339b1 | 153 | if (k == 0) { |
fa2d8369 | 154 | pte0 = *pte; |
851339b1 IM |
155 | } else { |
156 | if (pgprot_val(pte_pgprot(*pte)) != | |
fa2d8369 | 157 | pgprot_val(pte_pgprot(pte0))) { |
851339b1 IM |
158 | len[i] = k; |
159 | break; | |
160 | } | |
fa2d8369 AK |
161 | } |
162 | if (test_bit(pfn + k, bm)) { | |
163 | len[i] = k; | |
164 | break; | |
165 | } | |
166 | __set_bit(pfn + k, bm); | |
167 | } | |
168 | if (!addr[i] || !pte || !k) { | |
169 | addr[i] = 0; | |
170 | continue; | |
171 | } | |
172 | ||
ab7e7924 | 173 | test_addr = addr[i]; |
110e0358 | 174 | err = change_page_attr_set(&test_addr, len[i], PAGE_CPA_TEST, 0); |
fa2d8369 | 175 | if (err < 0) { |
851339b1 | 176 | printk(KERN_ERR "CPA %d failed %d\n", i, err); |
fa2d8369 AK |
177 | failed++; |
178 | } | |
179 | ||
180 | pte = lookup_address(addr[i], &level); | |
5a654ba7 | 181 | if (!pte || !pte_testbit(*pte) || pte_huge(*pte)) { |
851339b1 | 182 | printk(KERN_ERR "CPA %lx: bad pte %Lx\n", addr[i], |
fa2d8369 AK |
183 | pte ? (u64)pte_val(*pte) : 0ULL); |
184 | failed++; | |
185 | } | |
86f03989 | 186 | if (level != PG_LEVEL_4K) { |
851339b1 IM |
187 | printk(KERN_ERR "CPA %lx: unexpected level %d\n", |
188 | addr[i], level); | |
fa2d8369 AK |
189 | failed++; |
190 | } | |
191 | ||
192 | } | |
193 | vfree(bm); | |
fa2d8369 AK |
194 | |
195 | failed += print_split(&sb); | |
196 | ||
fa2d8369 AK |
197 | for (i = 0; i < NTEST; i++) { |
198 | if (!addr[i]) | |
199 | continue; | |
200 | pte = lookup_address(addr[i], &level); | |
201 | if (!pte) { | |
851339b1 | 202 | printk(KERN_ERR "CPA lookup of %lx failed\n", addr[i]); |
fa2d8369 AK |
203 | failed++; |
204 | continue; | |
205 | } | |
ab7e7924 | 206 | test_addr = addr[i]; |
110e0358 | 207 | err = change_page_attr_clear(&test_addr, len[i], PAGE_CPA_TEST, 0); |
fa2d8369 | 208 | if (err < 0) { |
851339b1 | 209 | printk(KERN_ERR "CPA reverting failed: %d\n", err); |
fa2d8369 AK |
210 | failed++; |
211 | } | |
212 | pte = lookup_address(addr[i], &level); | |
5a654ba7 | 213 | if (!pte || pte_testbit(*pte)) { |
851339b1 IM |
214 | printk(KERN_ERR "CPA %lx: bad pte after revert %Lx\n", |
215 | addr[i], pte ? (u64)pte_val(*pte) : 0ULL); | |
fa2d8369 AK |
216 | failed++; |
217 | } | |
218 | ||
219 | } | |
fa2d8369 AK |
220 | |
221 | failed += print_split(&sc); | |
fa2d8369 | 222 | |
55ce29ba | 223 | if (failed) { |
875e40b9 | 224 | WARN(1, KERN_ERR "NOT PASSED. Please report.\n"); |
971a52d6 | 225 | return -EINVAL; |
55ce29ba | 226 | } else { |
971a52d6 IM |
227 | if (print) |
228 | printk(KERN_INFO "ok.\n"); | |
55ce29ba | 229 | } |
fa2d8369 AK |
230 | |
231 | return 0; | |
232 | } | |
971a52d6 IM |
233 | |
234 | static int do_pageattr_test(void *__unused) | |
235 | { | |
236 | while (!kthread_should_stop()) { | |
237 | schedule_timeout_interruptible(HZ*30); | |
238 | if (pageattr_test() < 0) | |
239 | break; | |
240 | if (print) | |
241 | print--; | |
242 | } | |
243 | return 0; | |
244 | } | |
245 | ||
246 | static int start_pageattr_test(void) | |
247 | { | |
248 | struct task_struct *p; | |
249 | ||
250 | p = kthread_create(do_pageattr_test, NULL, "pageattr-test"); | |
251 | if (!IS_ERR(p)) | |
252 | wake_up_process(p); | |
253 | else | |
254 | WARN_ON(1); | |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
259 | module_init(start_pageattr_test); |