mirror of
https://git.proxmox.com/git/mirror_ubuntu-kernels.git
synced 2026-01-28 09:08:15 +00:00
81b1e3f91d
Patch series "selftests/mm: new test for FOLL_LONGTERM on file mappings". Let's add some selftests to make sure that: * R/O long-term pinning always works of file mappings * R/W long-term pinning always works in MAP_PRIVATE file mappings * R/W long-term pinning only works in MAP_SHARED mappings with special filesystems (shmem, hugetlb) and fails with other filesystems (ext4, btrfs, xfs). The tests make use of the gup_test kernel module to trigger ordinary GUP and GUP-fast, and liburing (similar to our COW selftests). Test with memfd, memfd hugetlb, tmpfile() and mkstemp(). The latter usually gives us a "real" filesystem (ext4, btrfs, xfs) where long-term pinning is expected to fail. Note that these selftests don't contain any actual reproducers for data corruptions in case R/W long-term pinning on problematic filesystems "would" work. Maybe we can later come up with a racy !FOLL_LONGTERM reproducer that can reuse an existing interface to trigger short-term pinning (I'll look into that next). On current mm/mm-unstable: # ./gup_longterm # [INFO] detected hugetlb page size: 2048 KiB # [INFO] detected hugetlb page size: 1048576 KiB TAP version 13 1..50 # [RUN] R/W longterm GUP pin in MAP_SHARED file mapping ... with memfd ok 1 Should have worked # [RUN] R/W longterm GUP pin in MAP_SHARED file mapping ... with tmpfile ok 2 Should have worked # [RUN] R/W longterm GUP pin in MAP_SHARED file mapping ... with local tmpfile ok 3 Should have failed # [RUN] R/W longterm GUP pin in MAP_SHARED file mapping ... with memfd hugetlb (2048 kB) ok 4 Should have worked # [RUN] R/W longterm GUP pin in MAP_SHARED file mapping ... with memfd hugetlb (1048576 kB) ok 5 Should have worked # [RUN] R/W longterm GUP-fast pin in MAP_SHARED file mapping ... with memfd ok 6 Should have worked # [RUN] R/W longterm GUP-fast pin in MAP_SHARED file mapping ... with tmpfile ok 7 Should have worked # [RUN] R/W longterm GUP-fast pin in MAP_SHARED file mapping ... with local tmpfile ok 8 Should have failed # [RUN] R/W longterm GUP-fast pin in MAP_SHARED file mapping ... with memfd hugetlb (2048 kB) ok 9 Should have worked # [RUN] R/W longterm GUP-fast pin in MAP_SHARED file mapping ... with memfd hugetlb (1048576 kB) ok 10 Should have worked # [RUN] R/O longterm GUP pin in MAP_SHARED file mapping ... with memfd ok 11 Should have worked # [RUN] R/O longterm GUP pin in MAP_SHARED file mapping ... with tmpfile ok 12 Should have worked # [RUN] R/O longterm GUP pin in MAP_SHARED file mapping ... with local tmpfile ok 13 Should have worked # [RUN] R/O longterm GUP pin in MAP_SHARED file mapping ... with memfd hugetlb (2048 kB) ok 14 Should have worked # [RUN] R/O longterm GUP pin in MAP_SHARED file mapping ... with memfd hugetlb (1048576 kB) ok 15 Should have worked # [RUN] R/O longterm GUP-fast pin in MAP_SHARED file mapping ... with memfd ok 16 Should have worked # [RUN] R/O longterm GUP-fast pin in MAP_SHARED file mapping ... with tmpfile ok 17 Should have worked # [RUN] R/O longterm GUP-fast pin in MAP_SHARED file mapping ... with local tmpfile ok 18 Should have worked # [RUN] R/O longterm GUP-fast pin in MAP_SHARED file mapping ... with memfd hugetlb (2048 kB) ok 19 Should have worked # [RUN] R/O longterm GUP-fast pin in MAP_SHARED file mapping ... with memfd hugetlb (1048576 kB) ok 20 Should have worked # [RUN] R/W longterm GUP pin in MAP_PRIVATE file mapping ... with memfd ok 21 Should have worked # [RUN] R/W longterm GUP pin in MAP_PRIVATE file mapping ... with tmpfile ok 22 Should have worked # [RUN] R/W longterm GUP pin in MAP_PRIVATE file mapping ... with local tmpfile ok 23 Should have worked # [RUN] R/W longterm GUP pin in MAP_PRIVATE file mapping ... with memfd hugetlb (2048 kB) ok 24 Should have worked # [RUN] R/W longterm GUP pin in MAP_PRIVATE file mapping ... with memfd hugetlb (1048576 kB) ok 25 Should have worked # [RUN] R/W longterm GUP-fast pin in MAP_PRIVATE file mapping ... with memfd ok 26 Should have worked # [RUN] R/W longterm GUP-fast pin in MAP_PRIVATE file mapping ... with tmpfile ok 27 Should have worked # [RUN] R/W longterm GUP-fast pin in MAP_PRIVATE file mapping ... with local tmpfile ok 28 Should have worked # [RUN] R/W longterm GUP-fast pin in MAP_PRIVATE file mapping ... with memfd hugetlb (2048 kB) ok 29 Should have worked # [RUN] R/W longterm GUP-fast pin in MAP_PRIVATE file mapping ... with memfd hugetlb (1048576 kB) ok 30 Should have worked # [RUN] R/O longterm GUP pin in MAP_PRIVATE file mapping ... with memfd ok 31 Should have worked # [RUN] R/O longterm GUP pin in MAP_PRIVATE file mapping ... with tmpfile ok 32 Should have worked # [RUN] R/O longterm GUP pin in MAP_PRIVATE file mapping ... with local tmpfile ok 33 Should have worked # [RUN] R/O longterm GUP pin in MAP_PRIVATE file mapping ... with memfd hugetlb (2048 kB) ok 34 Should have worked # [RUN] R/O longterm GUP pin in MAP_PRIVATE file mapping ... with memfd hugetlb (1048576 kB) ok 35 Should have worked # [RUN] R/O longterm GUP-fast pin in MAP_PRIVATE file mapping ... with memfd ok 36 Should have worked # [RUN] R/O longterm GUP-fast pin in MAP_PRIVATE file mapping ... with tmpfile ok 37 Should have worked # [RUN] R/O longterm GUP-fast pin in MAP_PRIVATE file mapping ... with local tmpfile ok 38 Should have worked # [RUN] R/O longterm GUP-fast pin in MAP_PRIVATE file mapping ... with memfd hugetlb (2048 kB) ok 39 Should have worked # [RUN] R/O longterm GUP-fast pin in MAP_PRIVATE file mapping ... with memfd hugetlb (1048576 kB) ok 40 Should have worked # [RUN] io_uring fixed buffer with MAP_SHARED file mapping ... with memfd ok 41 Should have worked # [RUN] io_uring fixed buffer with MAP_SHARED file mapping ... with tmpfile ok 42 Should have worked # [RUN] io_uring fixed buffer with MAP_SHARED file mapping ... with local tmpfile ok 43 Should have failed # [RUN] io_uring fixed buffer with MAP_SHARED file mapping ... with memfd hugetlb (2048 kB) ok 44 Should have worked # [RUN] io_uring fixed buffer with MAP_SHARED file mapping ... with memfd hugetlb (1048576 kB) ok 45 Should have worked # [RUN] io_uring fixed buffer with MAP_PRIVATE file mapping ... with memfd ok 46 Should have worked # [RUN] io_uring fixed buffer with MAP_PRIVATE file mapping ... with tmpfile ok 47 Should have worked # [RUN] io_uring fixed buffer with MAP_PRIVATE file mapping ... with local tmpfile ok 48 Should have worked # [RUN] io_uring fixed buffer with MAP_PRIVATE file mapping ... with memfd hugetlb (2048 kB) ok 49 Should have worked # [RUN] io_uring fixed buffer with MAP_PRIVATE file mapping ... with memfd hugetlb (1048576 kB) ok 50 Should have worked # Totals: pass:50 fail:0 xfail:0 xpass:0 skip:0 error:0 This patch (of 3): Let's factor detection out into vm_util, to be reused by a new test. Link: https://lkml.kernel.org/r/20230519102723.185721-1-david@redhat.com Link: https://lkml.kernel.org/r/20230519102723.185721-2-david@redhat.com Signed-off-by: David Hildenbrand <david@redhat.com> Reviewed-by: Lorenzo Stoakes <lstoakes@gmail.com> Cc: Jan Kara <jack@suse.cz> Cc: Jason Gunthorpe <jgg@nvidia.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Peter Xu <peterx@redhat.com> Cc: Shuah Khan <shuah@kernel.org> 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 */
|
|
#include <stdint.h>
|
|
#include <stdbool.h>
|
|
#include <sys/mman.h>
|
|
#include <err.h>
|
|
#include <string.h> /* ffsl() */
|
|
#include <unistd.h> /* _SC_PAGESIZE */
|
|
|
|
#define BIT_ULL(nr) (1ULL << (nr))
|
|
#define PM_SOFT_DIRTY BIT_ULL(55)
|
|
#define PM_MMAP_EXCLUSIVE BIT_ULL(56)
|
|
#define PM_UFFD_WP BIT_ULL(57)
|
|
#define PM_FILE BIT_ULL(61)
|
|
#define PM_SWAP BIT_ULL(62)
|
|
#define PM_PRESENT BIT_ULL(63)
|
|
|
|
extern unsigned int __page_size;
|
|
extern unsigned int __page_shift;
|
|
|
|
static inline unsigned int psize(void)
|
|
{
|
|
if (!__page_size)
|
|
__page_size = sysconf(_SC_PAGESIZE);
|
|
return __page_size;
|
|
}
|
|
|
|
static inline unsigned int pshift(void)
|
|
{
|
|
if (!__page_shift)
|
|
__page_shift = (ffsl(psize()) - 1);
|
|
return __page_shift;
|
|
}
|
|
|
|
uint64_t pagemap_get_entry(int fd, char *start);
|
|
bool pagemap_is_softdirty(int fd, char *start);
|
|
bool pagemap_is_swapped(int fd, char *start);
|
|
bool pagemap_is_populated(int fd, char *start);
|
|
unsigned long pagemap_get_pfn(int fd, char *start);
|
|
void clear_softdirty(void);
|
|
bool check_for_pattern(FILE *fp, const char *pattern, char *buf, size_t len);
|
|
uint64_t read_pmd_pagesize(void);
|
|
bool check_huge_anon(void *addr, int nr_hpages, uint64_t hpage_size);
|
|
bool check_huge_file(void *addr, int nr_hpages, uint64_t hpage_size);
|
|
bool check_huge_shmem(void *addr, int nr_hpages, uint64_t hpage_size);
|
|
int64_t allocate_transhuge(void *ptr, int pagemap_fd);
|
|
unsigned long default_huge_page_size(void);
|
|
int detect_hugetlb_page_sizes(size_t sizes[], int max);
|
|
|
|
int uffd_register(int uffd, void *addr, uint64_t len,
|
|
bool miss, bool wp, bool minor);
|
|
int uffd_unregister(int uffd, void *addr, uint64_t len);
|
|
int uffd_open_dev(unsigned int flags);
|
|
int uffd_open_sys(unsigned int flags);
|
|
int uffd_open(unsigned int flags);
|
|
int uffd_get_features(uint64_t *features);
|
|
int uffd_register_with_ioctls(int uffd, void *addr, uint64_t len,
|
|
bool miss, bool wp, bool minor, uint64_t *ioctls);
|
|
|
|
/*
|
|
* On ppc64 this will only work with radix 2M hugepage size
|
|
*/
|
|
#define HPAGE_SHIFT 21
|
|
#define HPAGE_SIZE (1 << HPAGE_SHIFT)
|
|
|
|
#define PAGEMAP_PRESENT(ent) (((ent) & (1ull << 63)) != 0)
|
|
#define PAGEMAP_PFN(ent) ((ent) & ((1ull << 55) - 1))
|