Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
fa2d8369 AK |
2 | /* |
3 | * self test for change_page_attr. | |
4 | * | |
5a654ba7 JF |
5 | * Clears the a test pte bit on random pages in the direct mapping, |
6 | * then reverts and compares page tables forwards and afterwards. | |
fa2d8369 | 7 | */ |
851339b1 | 8 | #include <linux/bootmem.h> |
971a52d6 | 9 | #include <linux/kthread.h> |
fa2d8369 AK |
10 | #include <linux/random.h> |
11 | #include <linux/kernel.h> | |
8f45fe44 | 12 | #include <linux/init.h> |
851339b1 | 13 | #include <linux/mm.h> |
d6472302 | 14 | #include <linux/vmalloc.h> |
851339b1 | 15 | |
fa2d8369 AK |
16 | #include <asm/cacheflush.h> |
17 | #include <asm/pgtable.h> | |
18 | #include <asm/kdebug.h> | |
19 | ||
971a52d6 IM |
20 | /* |
21 | * Only print the results of the first pass: | |
22 | */ | |
23 | static __read_mostly int print = 1; | |
24 | ||
fa2d8369 | 25 | enum { |
971a52d6 | 26 | NTEST = 400, |
fa2d8369 | 27 | #ifdef CONFIG_X86_64 |
851339b1 | 28 | LPS = (1 << PMD_SHIFT), |
fa2d8369 | 29 | #elif defined(CONFIG_X86_PAE) |
851339b1 | 30 | LPS = (1 << PMD_SHIFT), |
fa2d8369 | 31 | #else |
851339b1 | 32 | LPS = (1 << 22), |
fa2d8369 | 33 | #endif |
851339b1 | 34 | GPS = (1<<30) |
fa2d8369 AK |
35 | }; |
36 | ||
110e0358 | 37 | #define PAGE_CPA_TEST __pgprot(_PAGE_CPA_TEST) |
5a654ba7 JF |
38 | |
39 | static int pte_testbit(pte_t pte) | |
40 | { | |
c46a7c81 | 41 | return pte_flags(pte) & _PAGE_SOFTW1; |
5a654ba7 JF |
42 | } |
43 | ||
fa2d8369 AK |
44 | struct split_state { |
45 | long lpg, gpg, spg, exec; | |
46 | long min_exec, max_exec; | |
47 | }; | |
48 | ||
971a52d6 | 49 | static int print_split(struct split_state *s) |
fa2d8369 | 50 | { |
fa2d8369 AK |
51 | long i, expected, missed = 0; |
52 | int err = 0; | |
53 | ||
54 | s->lpg = s->gpg = s->spg = s->exec = 0; | |
55 | s->min_exec = ~0UL; | |
56 | s->max_exec = 0; | |
f87519e8 | 57 | for (i = 0; i < max_pfn_mapped; ) { |
851339b1 | 58 | unsigned long addr = (unsigned long)__va(i << PAGE_SHIFT); |
93809be8 | 59 | unsigned int level; |
fa2d8369 | 60 | pte_t *pte; |
fa2d8369 | 61 | |
851339b1 | 62 | pte = lookup_address(addr, &level); |
fa2d8369 | 63 | if (!pte) { |
fa2d8369 AK |
64 | missed++; |
65 | i++; | |
66 | continue; | |
67 | } | |
68 | ||
86f03989 | 69 | if (level == PG_LEVEL_1G && sizeof(long) == 8) { |
fa2d8369 AK |
70 | s->gpg++; |
71 | i += GPS/PAGE_SIZE; | |
86f03989 | 72 | } else if (level == PG_LEVEL_2M) { |
18699739 | 73 | if ((pte_val(*pte) & _PAGE_PRESENT) && !(pte_val(*pte) & _PAGE_PSE)) { |
851339b1 IM |
74 | printk(KERN_ERR |
75 | "%lx level %d but not PSE %Lx\n", | |
76 | addr, level, (u64)pte_val(*pte)); | |
fa2d8369 AK |
77 | err = 1; |
78 | } | |
79 | s->lpg++; | |
80 | i += LPS/PAGE_SIZE; | |
81 | } else { | |
82 | s->spg++; | |
83 | i++; | |
84 | } | |
85 | if (!(pte_val(*pte) & _PAGE_NX)) { | |
86 | s->exec++; | |
851339b1 IM |
87 | if (addr < s->min_exec) |
88 | s->min_exec = addr; | |
89 | if (addr > s->max_exec) | |
90 | s->max_exec = addr; | |
fa2d8369 AK |
91 | } |
92 | } | |
971a52d6 IM |
93 | if (print) { |
94 | printk(KERN_INFO | |
95 | " 4k %lu large %lu gb %lu x %lu[%lx-%lx] miss %lu\n", | |
96 | s->spg, s->lpg, s->gpg, s->exec, | |
97 | s->min_exec != ~0UL ? s->min_exec : 0, | |
98 | s->max_exec, missed); | |
99 | } | |
851339b1 | 100 | |
fa2d8369 AK |
101 | expected = (s->gpg*GPS + s->lpg*LPS)/PAGE_SIZE + s->spg + missed; |
102 | if (expected != i) { | |
f87519e8 TG |
103 | printk(KERN_ERR "CPA max_pfn_mapped %lu but expected %lu\n", |
104 | max_pfn_mapped, expected); | |
fa2d8369 AK |
105 | return 1; |
106 | } | |
107 | return err; | |
108 | } | |
109 | ||
971a52d6 IM |
110 | static unsigned long addr[NTEST]; |
111 | static unsigned int len[NTEST]; | |
fa2d8369 AK |
112 | |
113 | /* Change the global bit on random pages in the direct mapping */ | |
971a52d6 | 114 | static int pageattr_test(void) |
fa2d8369 | 115 | { |
851339b1 IM |
116 | struct split_state sa, sb, sc; |
117 | unsigned long *bm; | |
fa2d8369 | 118 | pte_t *pte, pte0; |
851339b1 | 119 | int failed = 0; |
93809be8 | 120 | unsigned int level; |
851339b1 | 121 | int i, k; |
fa2d8369 | 122 | int err; |
ab7e7924 | 123 | unsigned long test_addr; |
fa2d8369 | 124 | |
971a52d6 IM |
125 | if (print) |
126 | printk(KERN_INFO "CPA self-test:\n"); | |
fa2d8369 | 127 | |
c4d017f2 | 128 | bm = vzalloc((max_pfn_mapped + 7) / 8); |
fa2d8369 | 129 | if (!bm) { |
851339b1 | 130 | printk(KERN_ERR "CPA Cannot vmalloc bitmap\n"); |
fa2d8369 AK |
131 | return -ENOMEM; |
132 | } | |
fa2d8369 AK |
133 | |
134 | failed += print_split(&sa); | |
851339b1 | 135 | |
fa2d8369 | 136 | for (i = 0; i < NTEST; i++) { |
56a1ba5f | 137 | unsigned long pfn = prandom_u32() % max_pfn_mapped; |
851339b1 | 138 | |
fa2d8369 | 139 | addr[i] = (unsigned long)__va(pfn << PAGE_SHIFT); |
56a1ba5f | 140 | len[i] = prandom_u32() % 100; |
f87519e8 | 141 | len[i] = min_t(unsigned long, len[i], max_pfn_mapped - pfn - 1); |
851339b1 | 142 | |
fa2d8369 AK |
143 | if (len[i] == 0) |
144 | len[i] = 1; | |
145 | ||
146 | pte = NULL; | |
147 | pte0 = pfn_pte(0, __pgprot(0)); /* shut gcc up */ | |
851339b1 | 148 | |
fa2d8369 AK |
149 | for (k = 0; k < len[i]; k++) { |
150 | pte = lookup_address(addr[i] + k*PAGE_SIZE, &level); | |
64f351d1 TG |
151 | if (!pte || pgprot_val(pte_pgprot(*pte)) == 0 || |
152 | !(pte_val(*pte) & _PAGE_PRESENT)) { | |
fa2d8369 AK |
153 | addr[i] = 0; |
154 | break; | |
155 | } | |
851339b1 | 156 | if (k == 0) { |
fa2d8369 | 157 | pte0 = *pte; |
851339b1 IM |
158 | } else { |
159 | if (pgprot_val(pte_pgprot(*pte)) != | |
fa2d8369 | 160 | pgprot_val(pte_pgprot(pte0))) { |
851339b1 IM |
161 | len[i] = k; |
162 | break; | |
163 | } | |
fa2d8369 AK |
164 | } |
165 | if (test_bit(pfn + k, bm)) { | |
166 | len[i] = k; | |
167 | break; | |
168 | } | |
169 | __set_bit(pfn + k, bm); | |
170 | } | |
171 | if (!addr[i] || !pte || !k) { | |
172 | addr[i] = 0; | |
173 | continue; | |
174 | } | |
175 | ||
ab7e7924 | 176 | test_addr = addr[i]; |
110e0358 | 177 | err = change_page_attr_set(&test_addr, len[i], PAGE_CPA_TEST, 0); |
fa2d8369 | 178 | if (err < 0) { |
851339b1 | 179 | printk(KERN_ERR "CPA %d failed %d\n", i, err); |
fa2d8369 AK |
180 | failed++; |
181 | } | |
182 | ||
183 | pte = lookup_address(addr[i], &level); | |
5a654ba7 | 184 | if (!pte || !pte_testbit(*pte) || pte_huge(*pte)) { |
851339b1 | 185 | printk(KERN_ERR "CPA %lx: bad pte %Lx\n", addr[i], |
fa2d8369 AK |
186 | pte ? (u64)pte_val(*pte) : 0ULL); |
187 | failed++; | |
188 | } | |
86f03989 | 189 | if (level != PG_LEVEL_4K) { |
851339b1 IM |
190 | printk(KERN_ERR "CPA %lx: unexpected level %d\n", |
191 | addr[i], level); | |
fa2d8369 AK |
192 | failed++; |
193 | } | |
194 | ||
195 | } | |
196 | vfree(bm); | |
fa2d8369 AK |
197 | |
198 | failed += print_split(&sb); | |
199 | ||
fa2d8369 AK |
200 | for (i = 0; i < NTEST; i++) { |
201 | if (!addr[i]) | |
202 | continue; | |
203 | pte = lookup_address(addr[i], &level); | |
204 | if (!pte) { | |
851339b1 | 205 | printk(KERN_ERR "CPA lookup of %lx failed\n", addr[i]); |
fa2d8369 AK |
206 | failed++; |
207 | continue; | |
208 | } | |
ab7e7924 | 209 | test_addr = addr[i]; |
110e0358 | 210 | err = change_page_attr_clear(&test_addr, len[i], PAGE_CPA_TEST, 0); |
fa2d8369 | 211 | if (err < 0) { |
851339b1 | 212 | printk(KERN_ERR "CPA reverting failed: %d\n", err); |
fa2d8369 AK |
213 | failed++; |
214 | } | |
215 | pte = lookup_address(addr[i], &level); | |
5a654ba7 | 216 | if (!pte || pte_testbit(*pte)) { |
851339b1 IM |
217 | printk(KERN_ERR "CPA %lx: bad pte after revert %Lx\n", |
218 | addr[i], pte ? (u64)pte_val(*pte) : 0ULL); | |
fa2d8369 AK |
219 | failed++; |
220 | } | |
221 | ||
222 | } | |
fa2d8369 AK |
223 | |
224 | failed += print_split(&sc); | |
fa2d8369 | 225 | |
55ce29ba | 226 | if (failed) { |
875e40b9 | 227 | WARN(1, KERN_ERR "NOT PASSED. Please report.\n"); |
971a52d6 | 228 | return -EINVAL; |
55ce29ba | 229 | } else { |
971a52d6 IM |
230 | if (print) |
231 | printk(KERN_INFO "ok.\n"); | |
55ce29ba | 232 | } |
fa2d8369 AK |
233 | |
234 | return 0; | |
235 | } | |
971a52d6 IM |
236 | |
237 | static int do_pageattr_test(void *__unused) | |
238 | { | |
239 | while (!kthread_should_stop()) { | |
240 | schedule_timeout_interruptible(HZ*30); | |
241 | if (pageattr_test() < 0) | |
242 | break; | |
243 | if (print) | |
244 | print--; | |
245 | } | |
246 | return 0; | |
247 | } | |
248 | ||
249 | static int start_pageattr_test(void) | |
250 | { | |
251 | struct task_struct *p; | |
252 | ||
253 | p = kthread_create(do_pageattr_test, NULL, "pageattr-test"); | |
254 | if (!IS_ERR(p)) | |
255 | wake_up_process(p); | |
256 | else | |
257 | WARN_ON(1); | |
258 | ||
259 | return 0; | |
260 | } | |
8f45fe44 | 261 | device_initcall(start_pageattr_test); |