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Date: Wed, 12 Apr 2023 12:43:41 -0400
From: Peter Xu <peterx@...hat.com>
To: linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc: David Hildenbrand <david@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Leonardo Bras Soares Passos <lsoaresp@...hat.com>,
peterx@...hat.com, Andrea Arcangeli <aarcange@...hat.com>,
Nadav Amit <nadav.amit@...il.com>,
Mike Rapoport <rppt@...ux.vnet.ibm.com>,
Axel Rasmussen <axelrasmussen@...gle.com>,
Mike Kravetz <mike.kravetz@...cle.com>
Subject: [PATCH v2 20/31] selftests/mm: Let uffd_handle_page_fault() take wp parameter
Make the handler optionally apply WP bit when resolving page faults for
either missing or minor page faults. This moves towards removing global
test_uffdio_wp outside of the common code.
Signed-off-by: Peter Xu <peterx@...hat.com>
---
tools/testing/selftests/mm/uffd-common.c | 17 +++++++++--------
tools/testing/selftests/mm/uffd-common.h | 6 ++++--
tools/testing/selftests/mm/uffd-stress.c | 16 ++++++++++------
3 files changed, 23 insertions(+), 16 deletions(-)
diff --git a/tools/testing/selftests/mm/uffd-common.c b/tools/testing/selftests/mm/uffd-common.c
index e746405aa8f3..daa2a95408e6 100644
--- a/tools/testing/selftests/mm/uffd-common.c
+++ b/tools/testing/selftests/mm/uffd-common.c
@@ -353,7 +353,7 @@ void wp_range(int ufd, __u64 start, __u64 len, bool wp)
err("clear WP failed: address=0x%"PRIx64, (uint64_t)start);
}
-static void continue_range(int ufd, __u64 start, __u64 len)
+static void continue_range(int ufd, __u64 start, __u64 len, bool wp)
{
struct uffdio_continue req;
int ret;
@@ -361,7 +361,7 @@ static void continue_range(int ufd, __u64 start, __u64 len)
req.range.start = start;
req.range.len = len;
req.mode = 0;
- if (test_uffdio_wp)
+ if (wp)
req.mode |= UFFDIO_CONTINUE_MODE_WP;
if (ioctl(ufd, UFFDIO_CONTINUE, &req))
@@ -429,7 +429,8 @@ void uffd_handle_page_fault(struct uffd_msg *msg, struct uffd_args *args)
area_dst_alias));
for (b = 0; b < page_size; ++b)
area[b] = ~area[b];
- continue_range(uffd, msg->arg.pagefault.address, page_size);
+ continue_range(uffd, msg->arg.pagefault.address, page_size,
+ args->apply_wp);
args->minor_faults++;
} else {
/*
@@ -459,7 +460,7 @@ void uffd_handle_page_fault(struct uffd_msg *msg, struct uffd_args *args)
offset = (char *)(unsigned long)msg->arg.pagefault.address - area_dst;
offset &= ~(page_size-1);
- if (copy_page(uffd, offset))
+ if (copy_page(uffd, offset, args->apply_wp))
args->missing_faults++;
}
}
@@ -555,7 +556,7 @@ static void wake_range(int ufd, unsigned long addr, unsigned long len)
addr), exit(1);
}
-int __copy_page(int ufd, unsigned long offset, bool retry)
+int __copy_page(int ufd, unsigned long offset, bool retry, bool wp)
{
struct uffdio_copy uffdio_copy;
@@ -564,7 +565,7 @@ int __copy_page(int ufd, unsigned long offset, bool retry)
uffdio_copy.dst = (unsigned long) area_dst + offset;
uffdio_copy.src = (unsigned long) area_src + offset;
uffdio_copy.len = page_size;
- if (test_uffdio_wp)
+ if (wp)
uffdio_copy.mode = UFFDIO_COPY_MODE_WP;
else
uffdio_copy.mode = 0;
@@ -587,7 +588,7 @@ int __copy_page(int ufd, unsigned long offset, bool retry)
return 0;
}
-int copy_page(int ufd, unsigned long offset)
+int copy_page(int ufd, unsigned long offset, bool wp)
{
- return __copy_page(ufd, offset, false);
+ return __copy_page(ufd, offset, false, wp);
}
diff --git a/tools/testing/selftests/mm/uffd-common.h b/tools/testing/selftests/mm/uffd-common.h
index f8d2ad178827..0ec07d025cfe 100644
--- a/tools/testing/selftests/mm/uffd-common.h
+++ b/tools/testing/selftests/mm/uffd-common.h
@@ -72,6 +72,8 @@
/* Userfaultfd test statistics */
struct uffd_args {
int cpu;
+ /* Whether apply wr-protects when installing pages */
+ bool apply_wp;
unsigned long missing_faults;
unsigned long wp_faults;
unsigned long minor_faults;
@@ -104,8 +106,8 @@ void userfaultfd_open(uint64_t *features);
int uffd_read_msg(int ufd, struct uffd_msg *msg);
void wp_range(int ufd, __u64 start, __u64 len, bool wp);
void uffd_handle_page_fault(struct uffd_msg *msg, struct uffd_args *args);
-int __copy_page(int ufd, unsigned long offset, bool retry);
-int copy_page(int ufd, unsigned long offset);
+int __copy_page(int ufd, unsigned long offset, bool retry, bool wp);
+int copy_page(int ufd, unsigned long offset, bool wp);
void *uffd_poll_thread(void *arg);
#define TEST_ANON 1
diff --git a/tools/testing/selftests/mm/uffd-stress.c b/tools/testing/selftests/mm/uffd-stress.c
index ce7251ab93ef..747d588c0d69 100644
--- a/tools/testing/selftests/mm/uffd-stress.c
+++ b/tools/testing/selftests/mm/uffd-stress.c
@@ -96,6 +96,7 @@ static void uffd_stats_reset(struct uffd_args *args, unsigned long n_cpus)
for (i = 0; i < n_cpus; i++) {
args[i].cpu = i;
+ args[i].apply_wp = test_uffdio_wp;
args[i].missing_faults = 0;
args[i].wp_faults = 0;
args[i].minor_faults = 0;
@@ -155,7 +156,7 @@ static void *locking_thread(void *arg)
static int copy_page_retry(int ufd, unsigned long offset)
{
- return __copy_page(ufd, offset, true);
+ return __copy_page(ufd, offset, true, test_uffdio_wp);
}
pthread_mutex_t uffd_read_mutex = PTHREAD_MUTEX_INITIALIZER;
@@ -308,7 +309,7 @@ static void sighndl(int sig, siginfo_t *siginfo, void *ptr)
* This also tests UFFD_FEATURE_EVENT_FORK event along with the signal
* feature. Using monitor thread, verify no userfault events are generated.
*/
-static int faulting_process(int signal_test)
+static int faulting_process(int signal_test, bool wp)
{
unsigned long nr;
unsigned long long count;
@@ -343,7 +344,7 @@ static int faulting_process(int signal_test)
if (steps == 1) {
/* This is a MISSING request */
steps++;
- if (copy_page(uffd, offset))
+ if (copy_page(uffd, offset, wp))
signalled++;
} else {
/* This is a WP request */
@@ -507,6 +508,7 @@ static int userfaultfd_events_test(void)
true, test_uffdio_wp, false))
err("register failure");
+ args.apply_wp = test_uffdio_wp;
if (pthread_create(&uffd_mon, &attr, uffd_poll_thread, &args))
err("uffd_poll_thread create");
@@ -515,7 +517,7 @@ static int userfaultfd_events_test(void)
err("fork");
if (!pid)
- exit(faulting_process(0));
+ exit(faulting_process(0, test_uffdio_wp));
waitpid(pid, &err, 0);
if (err)
@@ -551,11 +553,12 @@ static int userfaultfd_sig_test(void)
true, test_uffdio_wp, false))
err("register failure");
- if (faulting_process(1))
+ if (faulting_process(1, test_uffdio_wp))
err("faulting process failed");
uffd_test_ops->release_pages(area_dst);
+ args.apply_wp = test_uffdio_wp;
if (pthread_create(&uffd_mon, &attr, uffd_poll_thread, &args))
err("uffd_poll_thread create");
@@ -564,7 +567,7 @@ static int userfaultfd_sig_test(void)
err("fork");
if (!pid)
- exit(faulting_process(2));
+ exit(faulting_process(2, test_uffdio_wp));
waitpid(pid, &err, 0);
if (err)
@@ -628,6 +631,7 @@ static int userfaultfd_minor_test(void)
page_size);
}
+ args.apply_wp = test_uffdio_wp;
if (pthread_create(&uffd_mon, &attr, uffd_poll_thread, &args))
err("uffd_poll_thread create");
--
2.39.1
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