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Peter Anvin" , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Jonathan Corbet , Shuah Khan , Shuah Khan , Vishal Annapurve , Andrew Morton , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , Youngjun Park , Qi Zheng , Shakeel Butt , Kiryl Shutsemau , Baoquan He , Jason Gunthorpe , John Hubbard , Peter Xu , tarunsahu@google.com, Jason Gunthorpe , Vlastimil Babka , Baoquan He Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, linux-coco@lists.linux.dev, Ackerley Tng X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1786139565; l=2727; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=hcW1DlqCdnSzmI45o3LcgBosQ7tTRCZf45DfrB9G7us=; b=D/7W5Lg+H24nvcVwXqYHutKeJIxMyV63gfZOGX1T6+gdFLZZ9D28ih82o1BmY8o8nFoq89D/n K2P0seUgnSjCPz3zEhqVM2qdMNqrM3HR/dEYV4zwyHiGOF6w0Es1Ifb X-Developer-Key: i=ackerleytng@google.com; a=ed25519; pk=sAZDYXdm6Iz8FHitpHeFlCMXwabodTm7p8/3/8xUxuU= X-Endpoint-Received: by B4 Relay for ackerleytng@google.com/20260225 with auth_id=649 X-Original-From: Ackerley Tng Reply-To: ackerleytng@google.com X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 3FAD0A000B X-Stat-Signature: msy46p3kwzwficjpcw6ureuz35nb7qfy X-HE-Tag: 1786139584-714224 X-HE-Meta: U2FsdGVkX19QPcYetLvkaQxtIKakIJSn5DCa+g7UlcpgEjt4ZFxcnwv988hA3dQejZuHeNTIhbtg4+ffKaBagcmtDi7XDTlQVYzSBIDMvDHKWmPPub8z/TzKFYdwDr8DONDV2gthkEGF1n5ZwtMH4T3xd2WRBzG0Fs55aZmCANjs4MmV+A5lMWPU1ytRBLzD4mDMQk/FL90ZD++MsrVVVK3jqNaLnxVqnje0ZVH5tA+DwOhlCVd722sQCWWsyBmpjWiZgT9fUmZPAtN3kq3GambmK4oQezcGFpmPibXtvHeI1CNxI+hWeHV8ZpTtyhd8NnKD5bYqM/t4CXgEFKHR/hTAdr1Dzue6poSCjaWrCtmm8AkoVUtV+CKZ8Oar91QjStytkX2gihQPqG1COlhsTiVARKRRm84/Y6eobgINTDSMF1NC206QYWo8pDZn+pq909xITDtq0rlaVAEh6Y5FdAJVrbWHjlNCDBS0kmHPqkZ/73kMXBNj1ZlFlCQsSQ/6vrQ1QZSIJ1I9LTO0hBA1TPRftcHbkMFHr52XO/s+jCFUKP5UDl/JMpZeBTBNCy+F0pecA0V67lP0zZCZoIcuSRME5wjA/gpIbLL9jevqGtqH9ZP52iUVMpVsmfu8TPWsdCK8IHxK74mcXpOgIekP7IZhzL9SMwJvt6XCJiFhswW3QWsv3J9nTM/cjXann8AVEyR54ibsG+Yv7DyOCivsNqR+YiMk6Pf8jfnfeqp/1BcrF7vAmpYMKtSkhsNNgP4HycL9BxOiIMdz5ITyb1D8zSxj6ls8o7xRocPps/FVUau2tNwEQlXgMM8DcRvC4HaDAnFzD+NFkW1/4Eltfx/rZULa+o672wmC4KMNyQsYn3vyH3uIGp+fev4xbtdfo3bhrU6mOxpu/yPAGAV9hEskvPoh/51BudOATKw1Qdyc3H7lXqWcsFl3CmeZ0aBdXYMx8MmB9CfyaS+Awrcza9n ueWnLtp4 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Ackerley Tng Add helper functions to allow KVM selftests to pin memory using CONFIG_GUP_TEST. This is useful for testing scenarios where some page has an increased refcount. such as in guest_memfd in-place conversion tests. The helpers open /sys/kernel/debug/gup_test and invoke the PIN_LONGTERM_TEST_START and PIN_LONGTERM_TEST_STOP ioctls. Since this functionality depends on the kernel being built with CONFIG_GUP_TEST, provide stub implementations that trigger a test failure if the configuration is missing. Reviewed-by: Fuad Tabba Tested-by: Shivank Garg Signed-off-by: Ackerley Tng --- tools/testing/selftests/kvm/include/kvm_util.h | 3 +++ tools/testing/selftests/kvm/lib/kvm_util.c | 25 +++++++++++++++++++++++++ 2 files changed, 28 insertions(+) diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h index 575032e9791d2..3cfe243d7c8b0 100644 --- a/tools/testing/selftests/kvm/include/kvm_util.h +++ b/tools/testing/selftests/kvm/include/kvm_util.h @@ -1206,6 +1206,9 @@ static inline int pin_self_to_any_cpu(void) return pin_task_to_any_cpu(pthread_self()); } +void pin_pages(void *vaddr, uint64_t size); +void unpin_pages(void); + void kvm_print_vcpu_pinning_help(void); void kvm_parse_vcpu_pinning(const char *pcpus_string, u32 vcpu_to_pcpu[], int nr_vcpus); diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index cd468b2bb8343..b1456ed76e27e 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -19,6 +19,8 @@ #include #include +#include "../../../../../mm/gup_test.h" + #define KVM_UTIL_MIN_PFN 2 u32 kvm_random_seed; @@ -645,6 +647,29 @@ int __pin_task_to_cpu(pthread_t task, int cpu) return pthread_setaffinity_np(task, sizeof(cpuset), &cpuset); } +static int gup_test_fd = -1; + +void pin_pages(void *vaddr, uint64_t size) +{ + const struct pin_longterm_test args = { + .addr = (uint64_t)vaddr, + .size = size, + .flags = PIN_LONGTERM_TEST_FLAG_USE_WRITE, + }; + + gup_test_fd = __open_path_or_exit("/sys/kernel/debug/gup_test", O_RDWR, + "Is CONFIG_GUP_TEST enabled?"); + + TEST_ASSERT_EQ(ioctl(gup_test_fd, PIN_LONGTERM_TEST_START, &args), 0); +} + +void unpin_pages(void) +{ + TEST_ASSERT_EQ(ioctl(gup_test_fd, PIN_LONGTERM_TEST_STOP), 0); + + kvm_free_fd(gup_test_fd); +} + static u32 parse_pcpu(const char *cpu_str, const cpu_set_t *allowed_mask) { u32 pcpu = atoi_non_negative("CPU number", cpu_str); -- 2.55.0.654.g21b8a5bc05-goog