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Subject[PATCH V2] selftest/vm: Add test case for mmap across 128TB boundary.
Date
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>

This patch add a self-test that covers a few corner cases of the interface.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---

Changes from V1:
* Add the test to run_vmtests script

tools/testing/selftests/vm/Makefile | 1 +
tools/testing/selftests/vm/run_vmtests | 11 ++
tools/testing/selftests/vm/va_128TBswitch.c | 297 ++++++++++++++++++++++++++++
3 files changed, 309 insertions(+)
create mode 100644 tools/testing/selftests/vm/va_128TBswitch.c

diff --git a/tools/testing/selftests/vm/Makefile b/tools/testing/selftests/vm/Makefile
index cbb29e41ef2b..b1fb3cd7cf52 100644
--- a/tools/testing/selftests/vm/Makefile
+++ b/tools/testing/selftests/vm/Makefile
@@ -17,6 +17,7 @@ TEST_GEN_FILES += transhuge-stress
TEST_GEN_FILES += userfaultfd
TEST_GEN_FILES += mlock-random-test
TEST_GEN_FILES += virtual_address_range
+TEST_GEN_FILES += va_128TBswitch

TEST_PROGS := run_vmtests

diff --git a/tools/testing/selftests/vm/run_vmtests b/tools/testing/selftests/vm/run_vmtests
index 07548a1fa901..d8305fb83125 100755
--- a/tools/testing/selftests/vm/run_vmtests
+++ b/tools/testing/selftests/vm/run_vmtests
@@ -176,4 +176,15 @@ else
echo "[PASS]"
fi

+echo "-----------------------------"
+echo "running virtual address 128TB switch test"
+echo "-----------------------------"
+./va_128TBswitch
+if [ $? -ne 0 ]; then
+ echo "[FAIL]"
+ exitcode=1
+else
+ echo "[PASS]"
+fi
+
exit $exitcode
diff --git a/tools/testing/selftests/vm/va_128TBswitch.c b/tools/testing/selftests/vm/va_128TBswitch.c
new file mode 100644
index 000000000000..2fdb84ab94b1
--- /dev/null
+++ b/tools/testing/selftests/vm/va_128TBswitch.c
@@ -0,0 +1,297 @@
+/*
+ *
+ * Authors: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
+ * Authors: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2.1 of the GNU Lesser General Public License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ */
+
+#include <stdio.h>
+#include <sys/mman.h>
+#include <string.h>
+
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
+
+#ifdef __powerpc64__
+#define PAGE_SIZE (64 << 10)
+/*
+ * This will work with 16M and 2M hugepage size
+ */
+#define HUGETLB_SIZE (16 << 20)
+#else
+#define PAGE_SIZE (4 << 10)
+#define HUGETLB_SIZE (2 << 20)
+#endif
+
+/*
+ * >= 128TB is the hint addr value we used to select
+ * large address space.
+ */
+#define ADDR_SWITCH_HINT (1UL << 47)
+#define LOW_ADDR ((void *) (1UL << 30))
+#define HIGH_ADDR ((void *) (1UL << 48))
+
+struct testcase {
+ void *addr;
+ unsigned long size;
+ unsigned long flags;
+ const char *msg;
+ unsigned int low_addr_required:1;
+ unsigned int keep_mapped:1;
+};
+
+static struct testcase testcases[] = {
+ {
+ /*
+ * If stack is moved, we could possibly allocate
+ * this at the requested address.
+ */
+ .addr = ((void *)(ADDR_SWITCH_HINT - PAGE_SIZE)),
+ .size = PAGE_SIZE,
+ .flags = MAP_PRIVATE | MAP_ANONYMOUS,
+ .msg = "mmap(ADDR_SWITCH_HINT - PAGE_SIZE, PAGE_SIZE)",
+ .low_addr_required = 1,
+ },
+ {
+ /*
+ * We should never allocate at the requested address or above it
+ * The len cross the 128TB boundary. Without MAP_FIXED
+ * we will always search in the lower address space.
+ */
+ .addr = ((void *)(ADDR_SWITCH_HINT - PAGE_SIZE)),
+ .size = 2 * PAGE_SIZE,
+ .flags = MAP_PRIVATE | MAP_ANONYMOUS,
+ .msg = "mmap(ADDR_SWITCH_HINT - PAGE_SIZE, (2 * PAGE_SIZE))",
+ .low_addr_required = 1,
+ },
+ {
+ /*
+ * Exact mapping at 128TB, the area is free we should get that
+ * even without MAP_FIXED.
+ */
+ .addr = ((void *)(ADDR_SWITCH_HINT)),
+ .size = PAGE_SIZE,
+ .flags = MAP_PRIVATE | MAP_ANONYMOUS,
+ .msg = "mmap(ADDR_SWITCH_HINT, PAGE_SIZE)",
+ .keep_mapped = 1,
+ },
+ {
+ .addr = (void *)(ADDR_SWITCH_HINT),
+ .size = 2 * PAGE_SIZE,
+ .flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED,
+ .msg = "mmap(ADDR_SWITCH_HINT, 2 * PAGE_SIZE, MAP_FIXED)",
+ },
+ {
+ .addr = NULL,
+ .size = 2 * PAGE_SIZE,
+ .flags = MAP_PRIVATE | MAP_ANONYMOUS,
+ .msg = "mmap(NULL)",
+ .low_addr_required = 1,
+ },
+ {
+ .addr = LOW_ADDR,
+ .size = 2 * PAGE_SIZE,
+ .flags = MAP_PRIVATE | MAP_ANONYMOUS,
+ .msg = "mmap(LOW_ADDR)",
+ .low_addr_required = 1,
+ },
+ {
+ .addr = HIGH_ADDR,
+ .size = 2 * PAGE_SIZE,
+ .flags = MAP_PRIVATE | MAP_ANONYMOUS,
+ .msg = "mmap(HIGH_ADDR)",
+ .keep_mapped = 1,
+ },
+ {
+ .addr = HIGH_ADDR,
+ .size = 2 * PAGE_SIZE,
+ .flags = MAP_PRIVATE | MAP_ANONYMOUS,
+ .msg = "mmap(HIGH_ADDR) again",
+ .keep_mapped = 1,
+ },
+ {
+ .addr = HIGH_ADDR,
+ .size = 2 * PAGE_SIZE,
+ .flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED,
+ .msg = "mmap(HIGH_ADDR, MAP_FIXED)",
+ },
+ {
+ .addr = (void *) -1,
+ .size = 2 * PAGE_SIZE,
+ .flags = MAP_PRIVATE | MAP_ANONYMOUS,
+ .msg = "mmap(-1)",
+ .keep_mapped = 1,
+ },
+ {
+ .addr = (void *) -1,
+ .size = 2 * PAGE_SIZE,
+ .flags = MAP_PRIVATE | MAP_ANONYMOUS,
+ .msg = "mmap(-1) again",
+ },
+ {
+ .addr = ((void *)(ADDR_SWITCH_HINT - PAGE_SIZE)),
+ .size = PAGE_SIZE,
+ .flags = MAP_PRIVATE | MAP_ANONYMOUS,
+ .msg = "mmap(ADDR_SWITCH_HINT - PAGE_SIZE, PAGE_SIZE)",
+ .low_addr_required = 1,
+ },
+ {
+ .addr = (void *)(ADDR_SWITCH_HINT - PAGE_SIZE),
+ .size = 2 * PAGE_SIZE,
+ .flags = MAP_PRIVATE | MAP_ANONYMOUS,
+ .msg = "mmap(ADDR_SWITCH_HINT - PAGE_SIZE, 2 * PAGE_SIZE)",
+ .low_addr_required = 1,
+ .keep_mapped = 1,
+ },
+ {
+ .addr = (void *)(ADDR_SWITCH_HINT - PAGE_SIZE / 2),
+ .size = 2 * PAGE_SIZE,
+ .flags = MAP_PRIVATE | MAP_ANONYMOUS,
+ .msg = "mmap(ADDR_SWITCH_HINT - PAGE_SIZE/2 , 2 * PAGE_SIZE)",
+ .low_addr_required = 1,
+ .keep_mapped = 1,
+ },
+ {
+ .addr = ((void *)(ADDR_SWITCH_HINT)),
+ .size = PAGE_SIZE,
+ .flags = MAP_PRIVATE | MAP_ANONYMOUS,
+ .msg = "mmap(ADDR_SWITCH_HINT, PAGE_SIZE)",
+ },
+ {
+ .addr = (void *)(ADDR_SWITCH_HINT),
+ .size = 2 * PAGE_SIZE,
+ .flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED,
+ .msg = "mmap(ADDR_SWITCH_HINT, 2 * PAGE_SIZE, MAP_FIXED)",
+ },
+};
+
+static struct testcase hugetlb_testcases[] = {
+ {
+ .addr = NULL,
+ .size = HUGETLB_SIZE,
+ .flags = MAP_HUGETLB | MAP_PRIVATE | MAP_ANONYMOUS,
+ .msg = "mmap(NULL, MAP_HUGETLB)",
+ .low_addr_required = 1,
+ },
+ {
+ .addr = LOW_ADDR,
+ .size = HUGETLB_SIZE,
+ .flags = MAP_HUGETLB | MAP_PRIVATE | MAP_ANONYMOUS,
+ .msg = "mmap(LOW_ADDR, MAP_HUGETLB)",
+ .low_addr_required = 1,
+ },
+ {
+ .addr = HIGH_ADDR,
+ .size = HUGETLB_SIZE,
+ .flags = MAP_HUGETLB | MAP_PRIVATE | MAP_ANONYMOUS,
+ .msg = "mmap(HIGH_ADDR, MAP_HUGETLB)",
+ .keep_mapped = 1,
+ },
+ {
+ .addr = HIGH_ADDR,
+ .size = HUGETLB_SIZE,
+ .flags = MAP_HUGETLB | MAP_PRIVATE | MAP_ANONYMOUS,
+ .msg = "mmap(HIGH_ADDR, MAP_HUGETLB) again",
+ .keep_mapped = 1,
+ },
+ {
+ .addr = HIGH_ADDR,
+ .size = HUGETLB_SIZE,
+ .flags = MAP_HUGETLB | MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED,
+ .msg = "mmap(HIGH_ADDR, MAP_FIXED | MAP_HUGETLB)",
+ },
+ {
+ .addr = (void *) -1,
+ .size = HUGETLB_SIZE,
+ .flags = MAP_HUGETLB | MAP_PRIVATE | MAP_ANONYMOUS,
+ .msg = "mmap(-1, MAP_HUGETLB)",
+ .keep_mapped = 1,
+ },
+ {
+ .addr = (void *) -1,
+ .size = HUGETLB_SIZE,
+ .flags = MAP_HUGETLB | MAP_PRIVATE | MAP_ANONYMOUS,
+ .msg = "mmap(-1, MAP_HUGETLB) again",
+ },
+ {
+ .addr = (void *)(ADDR_SWITCH_HINT - PAGE_SIZE),
+ .size = 2 * HUGETLB_SIZE,
+ .flags = MAP_HUGETLB | MAP_PRIVATE | MAP_ANONYMOUS,
+ .msg = "mmap(ADDR_SWITCH_HINT - PAGE_SIZE, 2*HUGETLB_SIZE, MAP_HUGETLB)",
+ .low_addr_required = 1,
+ .keep_mapped = 1,
+ },
+ {
+ .addr = (void *)(ADDR_SWITCH_HINT),
+ .size = 2 * HUGETLB_SIZE,
+ .flags = MAP_HUGETLB | MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED,
+ .msg = "mmap(ADDR_SWITCH_HINT , 2*HUGETLB_SIZE, MAP_FIXED | MAP_HUGETLB)",
+ },
+};
+
+static int run_test(struct testcase *test, int count)
+{
+ void *p;
+ int i, ret = 0;
+
+ for (i = 0; i < count; i++) {
+ struct testcase *t = test + i;
+
+ p = mmap(t->addr, t->size, PROT_READ | PROT_WRITE, t->flags, -1, 0);
+
+ printf("%s: %p - ", t->msg, p);
+
+ if (p == MAP_FAILED) {
+ printf("FAILED\n");
+ ret = 1;
+ continue;
+ }
+
+ if (t->low_addr_required && p >= (void *)(1UL << 47)) {
+ printf("FAILED\n");
+ ret = 1;
+ } else {
+ /*
+ * Do a dereference of the address returned so that we catch
+ * bugs in page fault handling
+ */
+ *(int *)p = 10;
+ printf("OK\n");
+ }
+ if (!t->keep_mapped)
+ munmap(p, t->size);
+ }
+
+ return ret;
+}
+
+static int supported_arch(void)
+{
+#if defined(__powerpc64__)
+ return 1;
+#elif defined(__x86_64__)
+ return 1;
+#else
+ return 0;
+#endif
+}
+
+int main(int argc, char **argv)
+{
+ int ret;
+
+ if (!supported_arch())
+ return 0;
+
+ ret = run_test(testcases, ARRAY_SIZE(testcases));
+ if (argc == 2 && !strcmp(argv[1], "--run-hugetlb"))
+ ret = run_test(hugetlb_testcases, ARRAY_SIZE(hugetlb_testcases));
+ return ret;
+}
--
2.14.3
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