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selftests/mm: smoke test UFFD_FEATURE_WP_UNPOPULATED

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Enable it by default on the stress test, and add some smoke tests for the
pte markers on anonymous.

Link: https://lkml.kernel.org/r/20230309223711.823547-3-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Muhammad Usama Anjum <usama.anjum@collabora.com>
Cc: Nadav Amit <nadav.amit@gmail.com>
Cc: Paul Gofman <pgofman@codeweavers.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Peter Xu 2023-03-09 17:37:11 -05:00 committed by Andrew Morton
parent 2bad466cc9
commit 47fba2b6d5
1 changed files with 43 additions and 2 deletions
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45
tools/testing/selftests/mm/userfaultfd.c
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@ -1444,6 +1444,43 @@ static int pagemap_test_fork(bool present)
return result;
}
static void userfaultfd_wp_unpopulated_test(int pagemap_fd)
{
uint64_t value;
/* Test applying pte marker to anon unpopulated */
wp_range(uffd, (uint64_t)area_dst, page_size, true);
value = pagemap_read_vaddr(pagemap_fd, area_dst);
pagemap_check_wp(value, true);
/* Test unprotect on anon pte marker */
wp_range(uffd, (uint64_t)area_dst, page_size, false);
value = pagemap_read_vaddr(pagemap_fd, area_dst);
pagemap_check_wp(value, false);
/* Test zap on anon marker */
wp_range(uffd, (uint64_t)area_dst, page_size, true);
if (madvise(area_dst, page_size, MADV_DONTNEED))
err("madvise(MADV_DONTNEED) failed");
value = pagemap_read_vaddr(pagemap_fd, area_dst);
pagemap_check_wp(value, false);
/* Test fault in after marker removed */
*area_dst = 1;
value = pagemap_read_vaddr(pagemap_fd, area_dst);
pagemap_check_wp(value, false);
/* Drop it to make pte none again */
if (madvise(area_dst, page_size, MADV_DONTNEED))
err("madvise(MADV_DONTNEED) failed");
/* Test read-zero-page upon pte marker */
wp_range(uffd, (uint64_t)area_dst, page_size, true);
*(volatile char *)area_dst;
/* Drop it to make pte none again */
if (madvise(area_dst, page_size, MADV_DONTNEED))
err("madvise(MADV_DONTNEED) failed");
}
static void userfaultfd_pagemap_test(unsigned int test_pgsize)
{
struct uffdio_register uffdio_register;
@ -1462,7 +1499,7 @@ static void userfaultfd_pagemap_test(unsigned int test_pgsize)
/* Flush so it doesn't flush twice in parent/child later */
fflush(stdout);
uffd_test_ctx_init(0);
uffd_test_ctx_init(UFFD_FEATURE_WP_UNPOPULATED);
if (test_pgsize > page_size) {
/* This is a thp test */
@ -1482,6 +1519,10 @@ static void userfaultfd_pagemap_test(unsigned int test_pgsize)
pagemap_fd = pagemap_open();
/* Smoke test WP_UNPOPULATED first when it's still empty */
if (test_pgsize == page_size)
userfaultfd_wp_unpopulated_test(pagemap_fd);
/* Touch the page */
*area_dst = 1;
wp_range(uffd, (uint64_t)area_dst, test_pgsize, true);
@ -1526,7 +1567,7 @@ static int userfaultfd_stress(void)
struct uffdio_register uffdio_register;
struct uffd_stats uffd_stats[nr_cpus];
uffd_test_ctx_init(0);
uffd_test_ctx_init(UFFD_FEATURE_WP_UNPOPULATED);
if (posix_memalign(&area, page_size, page_size))
err("out of memory");