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f3b92176f4
Add a test to the guard region self tests to assert that the /proc/$pid/pagemap information now made availabile to the user correctly identifies and reports guard regions. As a part of this change, update vm_util.h to add the new bit (note there is no header file in the kernel where this is exposed, the user is expected to provide their own mask) and utilise the helper functions there for pagemap functionality. [lorenzo.stoakes@oracle.com: fixup define name] Link: https://lkml.kernel.org/r/32e83941-e6f5-42ee-9292-a44c16463cf1@lucifer.local Link: https://lkml.kernel.org/r/164feb0a43ae72650e6b20c3910213f469566311.1740139449.git.lorenzo.stoakes@oracle.com Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: David Hildenbrand <david@redhat.com> Cc: Jann Horn <jannh@google.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Kalesh Singh <kaleshsingh@google.com> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Matthew Wilcow (Oracle) <willy@infradead.org> Cc: "Paul E . McKenney" <paulmck@kernel.org> Cc: Shuah Khan <shuah@kernel.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
67 lines
2.2 KiB
C
67 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#include <stdint.h>
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#include <stdbool.h>
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#include <sys/mman.h>
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#include <err.h>
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#include <strings.h> /* ffsl() */
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#include <unistd.h> /* _SC_PAGESIZE */
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#define BIT_ULL(nr) (1ULL << (nr))
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#define PM_SOFT_DIRTY BIT_ULL(55)
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#define PM_MMAP_EXCLUSIVE BIT_ULL(56)
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#define PM_UFFD_WP BIT_ULL(57)
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#define PM_GUARD_REGION BIT_ULL(58)
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#define PM_FILE BIT_ULL(61)
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#define PM_SWAP BIT_ULL(62)
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#define PM_PRESENT BIT_ULL(63)
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extern unsigned int __page_size;
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extern unsigned int __page_shift;
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static inline unsigned int psize(void)
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{
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if (!__page_size)
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__page_size = sysconf(_SC_PAGESIZE);
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return __page_size;
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}
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static inline unsigned int pshift(void)
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{
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if (!__page_shift)
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__page_shift = (ffsl(psize()) - 1);
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return __page_shift;
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}
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uint64_t pagemap_get_entry(int fd, char *start);
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bool pagemap_is_softdirty(int fd, char *start);
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bool pagemap_is_swapped(int fd, char *start);
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bool pagemap_is_populated(int fd, char *start);
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unsigned long pagemap_get_pfn(int fd, char *start);
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void clear_softdirty(void);
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bool check_for_pattern(FILE *fp, const char *pattern, char *buf, size_t len);
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uint64_t read_pmd_pagesize(void);
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unsigned long rss_anon(void);
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bool check_huge_anon(void *addr, int nr_hpages, uint64_t hpage_size);
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bool check_huge_file(void *addr, int nr_hpages, uint64_t hpage_size);
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bool check_huge_shmem(void *addr, int nr_hpages, uint64_t hpage_size);
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int64_t allocate_transhuge(void *ptr, int pagemap_fd);
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unsigned long default_huge_page_size(void);
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int detect_hugetlb_page_sizes(size_t sizes[], int max);
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int uffd_register(int uffd, void *addr, uint64_t len,
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bool miss, bool wp, bool minor);
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int uffd_unregister(int uffd, void *addr, uint64_t len);
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int uffd_register_with_ioctls(int uffd, void *addr, uint64_t len,
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bool miss, bool wp, bool minor, uint64_t *ioctls);
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unsigned long get_free_hugepages(void);
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bool check_vmflag_io(void *addr);
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/*
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* On ppc64 this will only work with radix 2M hugepage size
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*/
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#define HPAGE_SHIFT 21
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#define HPAGE_SIZE (1 << HPAGE_SHIFT)
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#define PAGEMAP_PRESENT(ent) (((ent) & (1ull << 63)) != 0)
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#define PAGEMAP_PFN(ent) ((ent) & ((1ull << 55) - 1))
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