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userfaultfd/selftests: exercise minor fault handling shmem support

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Enable test_uffdio_minor for test_type == TEST_SHMEM, and modify the test
slightly to pass in / check for the right feature flags.

Link: https://lkml.kernel.org/r/20210503180737.2487560-11-axelrasmussen@google.com
Signed-off-by: Axel Rasmussen <axelrasmussen@google.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Brian Geffon <bgeffon@google.com>
Cc: "Dr . David Alan Gilbert" <dgilbert@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: Joe Perches <joe@perches.com>
Cc: Kirill A. Shutemov <kirill@shutemov.name>
Cc: Lokesh Gidra <lokeshgidra@google.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Oliver Upton <oupton@google.com>
Cc: Shaohua Li <shli@fb.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Wang Qing <wangqing@vivo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Axel Rasmussen 2021-06-30 18:49:45 -07:00 committed by Linus Torvalds
parent 8ba6e86408
commit 4a8f021ba0
1 changed files with 25 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

29
tools/testing/selftests/vm/userfaultfd.c
View file

@ -474,6 +474,7 @@ static void wp_range(int ufd, __u64 start, __u64 len, bool wp)
static void continue_range(int ufd, __u64 start, __u64 len)
{
struct uffdio_continue req;
int ret;
req.range.start = start;
req.range.len = len;
@ -482,6 +483,17 @@ static void continue_range(int ufd, __u64 start, __u64 len)
if (ioctl(ufd, UFFDIO_CONTINUE, &req))
err("UFFDIO_CONTINUE failed for address 0x%" PRIx64,
(uint64_t)start);
/*
* Error handling within the kernel for continue is subtly different
* from copy or zeropage, so it may be a source of bugs. Trigger an
* error (-EEXIST) on purpose, to verify doing so doesn't cause a BUG.
*/
req.mapped = 0;
ret = ioctl(ufd, UFFDIO_CONTINUE, &req);
if (ret >= 0 || req.mapped != -EEXIST)
err("failed to exercise UFFDIO_CONTINUE error handling, ret=%d, mapped=%" PRId64,
ret, (int64_t) req.mapped);
}
static void *locking_thread(void *arg)
@ -1182,7 +1194,7 @@ static int userfaultfd_minor_test(void)
void *expected_page;
char c;
struct uffd_stats stats = { 0 };
uint64_t features = UFFD_FEATURE_MINOR_HUGETLBFS;
uint64_t req_features, features_out;
if (!test_uffdio_minor)
return 0;
@ -1190,9 +1202,17 @@ static int userfaultfd_minor_test(void)
printf("testing minor faults: ");
fflush(stdout);
uffd_test_ctx_init_ext(&features);
/* If kernel reports the feature isn't supported, skip the test. */
if (!(features & UFFD_FEATURE_MINOR_HUGETLBFS)) {
if (test_type == TEST_HUGETLB)
req_features = UFFD_FEATURE_MINOR_HUGETLBFS;
else if (test_type == TEST_SHMEM)
req_features = UFFD_FEATURE_MINOR_SHMEM;
else
return 1;
features_out = req_features;
uffd_test_ctx_init_ext(&features_out);
/* If kernel reports required features aren't supported, skip test. */
if ((features_out & req_features) != req_features) {
printf("skipping test due to lack of feature support\n");
fflush(stdout);
return 0;
@ -1575,6 +1595,7 @@ static void set_test_type(const char *type)
map_shared = true;
test_type = TEST_SHMEM;
uffd_test_ops = &shmem_uffd_test_ops;
test_uffdio_minor = true;
} else {
err("Unknown test type: %s", type);
}