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a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=6UeiqGixMTsA:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=yPCof4ZbAAAA:8 a=VwQbUJbxAAAA:8 a=Q1rnGyXiy6mPtF9hYIQA:9 a=cPQSjfK2_nFv0Q5t_7PE:22 X-Proofpoint-ORIG-GUID: i4rBokD65iIEIR8M5c4ymK56BMeOLzUk X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTE1MDAzMSBTYWx0ZWRfX5gdgRed5QcW8 Askk0jpUy6jA5ylzcPUMDxtJp9ZtZbZ8zYwLaa59LaaklsuHJgX0qnnUthnmbz+SBT+Bbl9kMfd uh/c/9hIg0LqGKP5+NKSsUnh4HToD4AkfxB2wsGCa3klnqJY7sFE6l69vY4O25htjGQzuhU7mLj benGHm9NnOYH8NpKNkz00kF8UJLmHiR8hl+8p7E/AS2nnQbGxd0RPKNOHHwrlSXIBbvTvTgRz2O GpPt1l/MdT+TPBp0ehgl1RNUkj9ET+lo573Q+RiSZKyom0HcTUuRJNOdd5+vTj3byoRzBTp7lW9 YIPjLAee+d0kyNPE33oIi1qDHAn+HZ/NahSYbEbFj0ET8gp0YJMhTch5bJFrKYO8E3luzvEiBC4 8HT/VxNL+Yy5hEMgH4XyFpO0fPk1WA== X-Proofpoint-GUID: i4rBokD65iIEIR8M5c4ymK56BMeOLzUk Content-Type: text/plain; charset="utf-8" Currently we set VM_SOFTDIRTY when a new mapping is set up (whether by establishing a new VMA, or via merge) as implemented in __mmap_complete() and do_brk_flags(). However, when performing a merge of existing mappings such as when performing mprotect(), we may lose the VM_SOFTDIRTY flag. This is because currently we simply ignore VM_SOFTDIRTY for the purposes of merge, so one VMA may possess the flag and another not, and whichever happens to be the target VMA will be the one upon which the merge is performed which may or may not have VM_SOFTDIRTY set. Now we have the concept of 'sticky' VMA flags, let's make VM_SOFTDIRTY one which solves this issue. Additionally update VMA userland tests to propagate changes. Signed-off-by: Lorenzo Stoakes Suggested-by: Vlastimil Babka Acked-by: David Hildenbrand (Red Hat) Reviewed-by: Pedro Falcato Acked-by: Andrey Vagin Reviewed-by: Vlastimil Babka --- include/linux/mm.h | 23 +++++++++++------------ tools/testing/vma/vma_internal.h | 23 +++++++++++------------ 2 files changed, 22 insertions(+), 24 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 73fc90cbad94..057649b948f2 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -532,29 +532,28 @@ extern unsigned int kobjsize(const void *objp); * possesses it but the other does not, the merged VMA should nonetheless = have * applied to it: * + * VM_SOFTDIRTY - if a VMA is marked soft-dirty, that is has not had its + * references cleared via /proc/$pid/clear_refs, any merg= ed VMA + * should be considered soft-dirty also as it operates at= a VMA + * granularity. + * * VM_MAYBE_GUARD - If a VMA may have guard regions in place it implies th= at * mapped page tables may contain metadata not described = by the * VMA and thus any merged VMA may also contain this meta= data, * and thus we must make this flag sticky. */ -#define VM_STICKY VM_MAYBE_GUARD +#define VM_STICKY (VM_SOFTDIRTY | VM_MAYBE_GUARD) /* * VMA flags we ignore for the purposes of merge, i.e. one VMA possessing = one * of these flags and the other not does not preclude a merge. * - * VM_SOFTDIRTY - Should not prevent from VMA merging, if we match the fla= gs but - * dirty bit -- the caller should mark merged VMA as dirty.= If - * dirty bit won't be excluded from comparison, we increase - * pressure on the memory system forcing the kernel to gene= rate - * new VMAs when old one could be extended instead. - * - * VM_STICKY - If one VMA has flags which most be 'sticky', that is ones - * which should propagate to all VMAs, but the other does n= ot, - * the merge should still proceed with the merge logic appl= ying - * sticky flags to the final VMA. + * VM_STICKY - If one VMA has flags which most be 'sticky', that is ones + * which should propagate to all VMAs, but the other does not, + * the merge should still proceed with the merge logic applying + * sticky flags to the final VMA. */ -#define VM_IGNORE_MERGE (VM_SOFTDIRTY | VM_STICKY) +#define VM_IGNORE_MERGE VM_STICKY /* * Flags which should result in page tables being copied on fork. These are diff --git a/tools/testing/vma/vma_internal.h b/tools/testing/vma/vma_inter= nal.h index bd6352a5f24d..10f46a95a73a 100644 --- a/tools/testing/vma/vma_internal.h +++ b/tools/testing/vma/vma_internal.h @@ -122,29 +122,28 @@ extern unsigned long dac_mmap_min_addr; * possesses it but the other does not, the merged VMA should nonetheless = have * applied to it: * + * VM_SOFTDIRTY - if a VMA is marked soft-dirty, that is has not had its + * references cleared via /proc/$pid/clear_refs, any merg= ed VMA + * should be considered soft-dirty also as it operates at= a VMA + * granularity. + * * VM_MAYBE_GUARD - If a VMA may have guard regions in place it implies th= at * mapped page tables may contain metadata not described = by the * VMA and thus any merged VMA may also contain this meta= data, * and thus we must make this flag sticky. */ -#define VM_STICKY VM_MAYBE_GUARD +#define VM_STICKY (VM_SOFTDIRTY | VM_MAYBE_GUARD) /* * VMA flags we ignore for the purposes of merge, i.e. one VMA possessing = one * of these flags and the other not does not preclude a merge. * - * VM_SOFTDIRTY - Should not prevent from VMA merging, if we match the fla= gs but - * dirty bit -- the caller should mark merged VMA as dirty.= If - * dirty bit won't be excluded from comparison, we increase - * pressure on the memory system forcing the kernel to gene= rate - * new VMAs when old one could be extended instead. - * - * VM_STICKY - If one VMA has flags which most be 'sticky', that is ones - * which should propagate to all VMAs, but the other does n= ot, - * the merge should still proceed with the merge logic appl= ying - * sticky flags to the final VMA. + * VM_STICKY - If one VMA has flags which most be 'sticky', that is ones + * which should propagate to all VMAs, but the other does not, + * the merge should still proceed with the merge logic applying + * sticky flags to the final VMA. */ -#define VM_IGNORE_MERGE (VM_SOFTDIRTY | VM_STICKY) +#define VM_IGNORE_MERGE VM_STICKY /* * Flags which should result in page tables being copied on fork. 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In order to do so, we have to account for the fact the pagemap interface checks soft dirty PTEs and additionally that newly merged VMAs are marked VM_SOFTDIRTY. We do this by using use unfaulted anon VMAs, establishing one and clearing references on that one, before establishing another and merging the two before checking that soft-dirty is propagated as expected. We check that this functions correctly with mremap() and mprotect() as sample cases, because VMA merge of adjacent newly mapped VMAs will automatically be made soft-dirty due to existing logic which does so. We are therefore exercising other means of merging VMAs. Signed-off-by: Lorenzo Stoakes --- tools/testing/selftests/mm/soft-dirty.c | 127 +++++++++++++++++++++++- 1 file changed, 126 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/mm/soft-dirty.c b/tools/testing/selfte= sts/mm/soft-dirty.c index 4ee4db3750c1..4c73820070ba 100644 --- a/tools/testing/selftests/mm/soft-dirty.c +++ b/tools/testing/selftests/mm/soft-dirty.c @@ -184,6 +184,130 @@ static void test_mprotect(int pagemap_fd, int pagesiz= e, bool anon) close(test_fd); } +static void test_merge(int pagemap_fd, int pagesize) +{ + char *reserved, *map, *map2; + + /* + * Reserve space for tests: + * + * ---padding to --- + * | avoid adj. | + * v merge v + * |---|---|---|---|---| + * | | 1 | 2 | 3 | | + * |---|---|---|---|---| + */ + reserved =3D mmap(NULL, 5 * pagesize, PROT_NONE, + MAP_ANON | MAP_PRIVATE, -1, 0); + if (reserved =3D=3D MAP_FAILED) + ksft_exit_fail_msg("mmap failed\n"); + munmap(reserved, 4 * pagesize); + + /* + * Establish initial VMA: + * + * S/D + * |---|---|---|---|---| + * | | 1 | | | | + * |---|---|---|---|---| + */ + map =3D mmap(&reserved[pagesize], pagesize, PROT_READ | PROT_WRITE, + MAP_ANON | MAP_PRIVATE | MAP_FIXED, -1, 0); + if (map =3D=3D MAP_FAILED) + ksft_exit_fail_msg("mmap failed\n"); + + /* This will clear VM_SOFTDIRTY too. */ + clear_softdirty(); + + /* + * Now place a new mapping which will be marked VM_SOFTDIRTY. Away from + * map: + * + * - S/D + * |---|---|---|---|---| + * | | 1 | | 2 | | + * |---|---|---|---|---| + */ + map2 =3D mmap(&reserved[3 * pagesize], pagesize, PROT_READ | PROT_WRITE, + MAP_ANON | MAP_PRIVATE | MAP_FIXED, -1, 0); + if (map2 =3D=3D MAP_FAILED) + ksft_exit_fail_msg("mmap failed\n"); + + /* + * Now remap it immediately adjacent to map, if the merge correctly + * propagates VM_SOFTDIRTY, we should then observe the VMA as a whole + * being marked soft-dirty: + * + * merge + * S/D + * |---|-------|---|---| + * | | 1 | | | + * |---|-------|---|---| + */ + map2 =3D mremap(map2, pagesize, pagesize, MREMAP_FIXED | MREMAP_MAYMOVE, + &reserved[2 * pagesize]); + if (map2 =3D=3D MAP_FAILED) + ksft_exit_fail_msg("mremap failed\n"); + ksft_test_result(pagemap_is_softdirty(pagemap_fd, map) =3D=3D 1, + "Test %s-anon soft-dirty after remap merge 1st pg\n", + __func__); + ksft_test_result(pagemap_is_softdirty(pagemap_fd, map2) =3D=3D 1, + "Test %s-anon soft-dirty after remap merge 2nd pg\n", + __func__); + + munmap(map, 2 * pagesize); + + /* + * Now establish another VMA: + * + * S/D + * |---|---|---|---|---| + * | | 1 | | | | + * |---|---|---|---|---| + */ + map =3D mmap(&reserved[pagesize], pagesize, PROT_READ | PROT_WRITE, + MAP_ANON | MAP_PRIVATE | MAP_FIXED, -1, 0); + if (map =3D=3D MAP_FAILED) + ksft_exit_fail_msg("mmap failed\n"); + + /* Clear VM_SOFTDIRTY... */ + clear_softdirty(); + /* ...and establish incompatible adjacent VMA: + * + * - S/D + * |---|---|---|---|---| + * | | 1 | 2 | | | + * |---|---|---|---|---| + */ + map2 =3D mmap(&reserved[2 * pagesize], pagesize, + PROT_READ | PROT_WRITE | PROT_EXEC, + MAP_ANON | MAP_PRIVATE | MAP_FIXED, -1, 0); + if (map2 =3D=3D MAP_FAILED) + ksft_exit_fail_msg("mmap failed\n"); + + /* + * Now mprotect() VMA 1 so it's compatible with 2 and therefore merges: + * + * merge + * S/D + * |---|-------|---|---| + * | | 1 | | | + * |---|-------|---|---| + */ + if (mprotect(map, pagesize, PROT_READ | PROT_WRITE | PROT_EXEC)) + ksft_exit_fail_msg("mprotect failed\n"); + + ksft_test_result(pagemap_is_softdirty(pagemap_fd, map) =3D=3D 1, + "Test %s-anon soft-dirty after mprotect merge 1st pg\n", + __func__); + ksft_test_result(pagemap_is_softdirty(pagemap_fd, map2) =3D=3D 1, + "Test %s-anon soft-dirty after mprotect merge 2nd pg\n", + __func__); + + munmap(map, 2 * pagesize); +} + static void test_mprotect_anon(int pagemap_fd, int pagesize) { test_mprotect(pagemap_fd, pagesize, true); @@ -204,7 +328,7 @@ int main(int argc, char **argv) if (!softdirty_supported()) ksft_exit_skip("soft-dirty is not support\n"); - ksft_set_plan(15); + ksft_set_plan(19); pagemap_fd =3D open(PAGEMAP_FILE_PATH, O_RDONLY); if (pagemap_fd < 0) ksft_exit_fail_msg("Failed to open %s\n", PAGEMAP_FILE_PATH); @@ -216,6 +340,7 @@ int main(int argc, char **argv) test_hugepage(pagemap_fd, pagesize); test_mprotect_anon(pagemap_fd, pagesize); test_mprotect_file(pagemap_fd, pagesize); + test_merge(pagemap_fd, pagesize); close(pagemap_fd); -- 2.51.0