From: Axel Rasmussen <axelrasmussen@google.com>
To: Alexander Viro <viro@zeniv.linux.org.uk>,
Andrea Arcangeli <aarcange@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Hugh Dickins <hughd@google.com>,
Jerome Glisse <jglisse@redhat.com>, Joe Perches <joe@perches.com>,
Lokesh Gidra <lokeshgidra@google.com>,
Mike Kravetz <mike.kravetz@oracle.com>,
Mike Rapoport <rppt@linux.vnet.ibm.com>,
Peter Xu <peterx@redhat.com>, Shaohua Li <shli@fb.com>,
Shuah Khan <shuah@kernel.org>,
Stephen Rothwell <sfr@canb.auug.org.au>,
Wang Qing <wangqing@vivo.com>
Cc: linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
linux-mm@kvack.org, Axel Rasmussen <axelrasmussen@google.com>,
Brian Geffon <bgeffon@google.com>,
"Dr . David Alan Gilbert" <dgilbert@redhat.com>,
Mina Almasry <almasrymina@google.com>,
Oliver Upton <oupton@google.com>
Subject: [PATCH v2 8/9] userfaultfd/selftests: exercise minor fault handling shmem support
Date: Mon, 12 Apr 2021 22:17:20 -0700 [thread overview]
Message-ID: <20210413051721.2896915-9-axelrasmussen@google.com> (raw)
In-Reply-To: <20210413051721.2896915-1-axelrasmussen@google.com>
Enable test_uffdio_minor for test_type == TEST_SHMEM, and modify the
test slightly to pass in / check for the right feature flags.
Signed-off-by: Axel Rasmussen <axelrasmussen@google.com>
---
tools/testing/selftests/vm/userfaultfd.c | 29 ++++++++++++++++++++----
1 file changed, 25 insertions(+), 4 deletions(-)
diff --git a/tools/testing/selftests/vm/userfaultfd.c b/tools/testing/selftests/vm/userfaultfd.c
index 0ff01f437a39..0830f155e6c2 100644
--- a/tools/testing/selftests/vm/userfaultfd.c
+++ b/tools/testing/selftests/vm/userfaultfd.c
@@ -484,6 +484,7 @@ 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;
@@ -492,6 +493,17 @@ 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)
@@ -1196,7 +1208,7 @@ 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;
@@ -1204,10 +1216,18 @@ static int userfaultfd_minor_test(void)
printf("testing minor faults: ");
fflush(stdout);
- if (uffd_test_ctx_clear() || uffd_test_ctx_init_ext(&features))
+ 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;
+ if (uffd_test_ctx_clear() || uffd_test_ctx_init_ext(&features_out))
return 1;
- /* If kernel reports the feature isn't supported, skip the test. */
- if (!(features & UFFD_FEATURE_MINOR_HUGETLBFS)) {
+ /* 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;
@@ -1442,6 +1462,7 @@ 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);
}
--
2.31.1.295.g9ea45b61b8-goog
next prev parent reply other threads:[~2021-04-13 5:17 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-13 5:17 [PATCH v2 0/9] userfaultfd: add minor fault handling for shmem Axel Rasmussen
2021-04-13 5:17 ` [PATCH v2 1/9] userfaultfd/hugetlbfs: avoid including userfaultfd_k.h in hugetlb.h Axel Rasmussen
2021-04-14 6:43 ` Hugh Dickins
2021-04-13 5:17 ` [PATCH v2 2/9] userfaultfd/shmem: combine shmem_{mcopy_atomic,mfill_zeropage}_pte Axel Rasmussen
2021-04-14 6:51 ` Hugh Dickins
2021-04-13 5:17 ` [PATCH v2 3/9] userfaultfd/shmem: support minor fault registration for shmem Axel Rasmussen
2021-04-13 20:43 ` Peter Xu
2021-04-14 7:36 ` Hugh Dickins
2021-04-14 18:51 ` Peter Xu
2021-04-13 5:17 ` [PATCH v2 4/9] userfaultfd/shmem: support UFFDIO_CONTINUE " Axel Rasmussen
2021-04-16 23:47 ` Hugh Dickins
2021-04-20 18:05 ` Axel Rasmussen
2021-04-13 5:17 ` [PATCH v2 5/9] userfaultfd/selftests: use memfd_create for shmem test type Axel Rasmussen
2021-04-13 20:16 ` Peter Xu
2021-04-13 5:17 ` [PATCH v2 6/9] userfaultfd/selftests: create alias mappings in the shmem test Axel Rasmussen
2021-04-13 20:17 ` Peter Xu
2021-04-13 5:17 ` [PATCH v2 7/9] userfaultfd/selftests: reinitialize test context in each test Axel Rasmussen
2021-04-13 20:15 ` Peter Xu
2021-04-15 18:03 ` Axel Rasmussen
2021-04-13 5:17 ` Axel Rasmussen [this message]
2021-04-13 5:17 ` [PATCH v2 9/9] userfaultfd/shmem: modify shmem_mcopy_atomic_pte to use install_ptes Axel Rasmussen
2021-04-17 0:34 ` Hugh Dickins
2021-04-20 18:43 ` Axel Rasmussen
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210413051721.2896915-9-axelrasmussen@google.com \
--to=axelrasmussen@google.com \
--cc=aarcange@redhat.com \
--cc=akpm@linux-foundation.org \
--cc=almasrymina@google.com \
--cc=bgeffon@google.com \
--cc=dgilbert@redhat.com \
--cc=hughd@google.com \
--cc=jglisse@redhat.com \
--cc=joe@perches.com \
--cc=linux-api@vger.kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-kselftest@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=lokeshgidra@google.com \
--cc=mike.kravetz@oracle.com \
--cc=oupton@google.com \
--cc=peterx@redhat.com \
--cc=rppt@linux.vnet.ibm.com \
--cc=sfr@canb.auug.org.au \
--cc=shli@fb.com \
--cc=shuah@kernel.org \
--cc=viro@zeniv.linux.org.uk \
--cc=wangqing@vivo.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).