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277 lines
5.6 KiB
277 lines
5.6 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* self test for change_page_attr. |
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* |
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* Clears the a test pte bit on random pages in the direct mapping, |
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* then reverts and compares page tables forwards and afterwards. |
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*/ |
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#include <linux/memblock.h> |
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#include <linux/kthread.h> |
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#include <linux/random.h> |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/mm.h> |
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#include <linux/vmalloc.h> |
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#include <asm/cacheflush.h> |
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#include <asm/kdebug.h> |
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/* |
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* Only print the results of the first pass: |
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*/ |
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static __read_mostly int print = 1; |
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enum { |
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NTEST = 3 * 100, |
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NPAGES = 100, |
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#ifdef CONFIG_X86_64 |
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LPS = (1 << PMD_SHIFT), |
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#elif defined(CONFIG_X86_PAE) |
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LPS = (1 << PMD_SHIFT), |
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#else |
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LPS = (1 << 22), |
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#endif |
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GPS = (1<<30) |
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}; |
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#define PAGE_CPA_TEST __pgprot(_PAGE_CPA_TEST) |
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static int pte_testbit(pte_t pte) |
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{ |
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return pte_flags(pte) & _PAGE_SOFTW1; |
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} |
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struct split_state { |
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long lpg, gpg, spg, exec; |
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long min_exec, max_exec; |
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}; |
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static int print_split(struct split_state *s) |
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{ |
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long i, expected, missed = 0; |
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int err = 0; |
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s->lpg = s->gpg = s->spg = s->exec = 0; |
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s->min_exec = ~0UL; |
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s->max_exec = 0; |
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for (i = 0; i < max_pfn_mapped; ) { |
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unsigned long addr = (unsigned long)__va(i << PAGE_SHIFT); |
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unsigned int level; |
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pte_t *pte; |
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pte = lookup_address(addr, &level); |
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if (!pte) { |
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missed++; |
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i++; |
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continue; |
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} |
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if (level == PG_LEVEL_1G && sizeof(long) == 8) { |
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s->gpg++; |
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i += GPS/PAGE_SIZE; |
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} else if (level == PG_LEVEL_2M) { |
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if ((pte_val(*pte) & _PAGE_PRESENT) && !(pte_val(*pte) & _PAGE_PSE)) { |
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printk(KERN_ERR |
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"%lx level %d but not PSE %Lx\n", |
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addr, level, (u64)pte_val(*pte)); |
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err = 1; |
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} |
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s->lpg++; |
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i += LPS/PAGE_SIZE; |
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} else { |
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s->spg++; |
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i++; |
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} |
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if (!(pte_val(*pte) & _PAGE_NX)) { |
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s->exec++; |
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if (addr < s->min_exec) |
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s->min_exec = addr; |
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if (addr > s->max_exec) |
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s->max_exec = addr; |
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} |
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} |
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if (print) { |
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printk(KERN_INFO |
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" 4k %lu large %lu gb %lu x %lu[%lx-%lx] miss %lu\n", |
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s->spg, s->lpg, s->gpg, s->exec, |
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s->min_exec != ~0UL ? s->min_exec : 0, |
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s->max_exec, missed); |
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} |
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expected = (s->gpg*GPS + s->lpg*LPS)/PAGE_SIZE + s->spg + missed; |
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if (expected != i) { |
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printk(KERN_ERR "CPA max_pfn_mapped %lu but expected %lu\n", |
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max_pfn_mapped, expected); |
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return 1; |
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} |
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return err; |
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} |
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static unsigned long addr[NTEST]; |
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static unsigned int len[NTEST]; |
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static struct page *pages[NPAGES]; |
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static unsigned long addrs[NPAGES]; |
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/* Change the global bit on random pages in the direct mapping */ |
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static int pageattr_test(void) |
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{ |
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struct split_state sa, sb, sc; |
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unsigned long *bm; |
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pte_t *pte, pte0; |
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int failed = 0; |
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unsigned int level; |
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int i, k; |
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int err; |
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if (print) |
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printk(KERN_INFO "CPA self-test:\n"); |
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bm = vzalloc((max_pfn_mapped + 7) / 8); |
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if (!bm) { |
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printk(KERN_ERR "CPA Cannot vmalloc bitmap\n"); |
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return -ENOMEM; |
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} |
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failed += print_split(&sa); |
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for (i = 0; i < NTEST; i++) { |
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unsigned long pfn = prandom_u32() % max_pfn_mapped; |
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addr[i] = (unsigned long)__va(pfn << PAGE_SHIFT); |
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len[i] = prandom_u32() % NPAGES; |
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len[i] = min_t(unsigned long, len[i], max_pfn_mapped - pfn - 1); |
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if (len[i] == 0) |
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len[i] = 1; |
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pte = NULL; |
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pte0 = pfn_pte(0, __pgprot(0)); /* shut gcc up */ |
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for (k = 0; k < len[i]; k++) { |
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pte = lookup_address(addr[i] + k*PAGE_SIZE, &level); |
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if (!pte || pgprot_val(pte_pgprot(*pte)) == 0 || |
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!(pte_val(*pte) & _PAGE_PRESENT)) { |
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addr[i] = 0; |
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break; |
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} |
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if (k == 0) { |
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pte0 = *pte; |
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} else { |
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if (pgprot_val(pte_pgprot(*pte)) != |
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pgprot_val(pte_pgprot(pte0))) { |
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len[i] = k; |
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break; |
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} |
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} |
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if (test_bit(pfn + k, bm)) { |
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len[i] = k; |
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break; |
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} |
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__set_bit(pfn + k, bm); |
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addrs[k] = addr[i] + k*PAGE_SIZE; |
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pages[k] = pfn_to_page(pfn + k); |
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} |
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if (!addr[i] || !pte || !k) { |
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addr[i] = 0; |
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continue; |
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} |
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switch (i % 3) { |
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case 0: |
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err = change_page_attr_set(&addr[i], len[i], PAGE_CPA_TEST, 0); |
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break; |
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case 1: |
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err = change_page_attr_set(addrs, len[1], PAGE_CPA_TEST, 1); |
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break; |
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case 2: |
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err = cpa_set_pages_array(pages, len[i], PAGE_CPA_TEST); |
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break; |
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} |
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if (err < 0) { |
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printk(KERN_ERR "CPA %d failed %d\n", i, err); |
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failed++; |
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} |
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pte = lookup_address(addr[i], &level); |
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if (!pte || !pte_testbit(*pte) || pte_huge(*pte)) { |
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printk(KERN_ERR "CPA %lx: bad pte %Lx\n", addr[i], |
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pte ? (u64)pte_val(*pte) : 0ULL); |
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failed++; |
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} |
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if (level != PG_LEVEL_4K) { |
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printk(KERN_ERR "CPA %lx: unexpected level %d\n", |
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addr[i], level); |
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failed++; |
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} |
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} |
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vfree(bm); |
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failed += print_split(&sb); |
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for (i = 0; i < NTEST; i++) { |
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if (!addr[i]) |
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continue; |
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pte = lookup_address(addr[i], &level); |
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if (!pte) { |
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printk(KERN_ERR "CPA lookup of %lx failed\n", addr[i]); |
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failed++; |
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continue; |
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} |
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err = change_page_attr_clear(&addr[i], len[i], PAGE_CPA_TEST, 0); |
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if (err < 0) { |
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printk(KERN_ERR "CPA reverting failed: %d\n", err); |
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failed++; |
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} |
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pte = lookup_address(addr[i], &level); |
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if (!pte || pte_testbit(*pte)) { |
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printk(KERN_ERR "CPA %lx: bad pte after revert %Lx\n", |
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addr[i], pte ? (u64)pte_val(*pte) : 0ULL); |
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failed++; |
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} |
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} |
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failed += print_split(&sc); |
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if (failed) { |
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WARN(1, KERN_ERR "NOT PASSED. Please report.\n"); |
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return -EINVAL; |
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} else { |
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if (print) |
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printk(KERN_INFO "ok.\n"); |
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} |
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return 0; |
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} |
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static int do_pageattr_test(void *__unused) |
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{ |
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while (!kthread_should_stop()) { |
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schedule_timeout_interruptible(HZ*30); |
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if (pageattr_test() < 0) |
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break; |
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if (print) |
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print--; |
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} |
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return 0; |
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} |
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static int start_pageattr_test(void) |
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{ |
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struct task_struct *p; |
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p = kthread_create(do_pageattr_test, NULL, "pageattr-test"); |
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if (!IS_ERR(p)) |
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wake_up_process(p); |
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else |
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WARN_ON(1); |
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return 0; |
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} |
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device_initcall(start_pageattr_test);
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