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Fri, 17 Feb 2023 16:43:15 -0800 (PST) Date: Sat, 18 Feb 2023 00:43:01 +0000 In-Reply-To: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.39.2.637.g21b0678d19-goog Message-ID: <4ea08e03d57152d505b747a6a570752dd698e315.1676680548.git.ackerleytng@google.com> Subject: [RFC PATCH 1/2] mm: restrictedmem: Add flag as THP allocation hint for memfd_restricted() syscall From: Ackerley Tng To: kvm@vger.kernel.org, linux-api@vger.kernel.org, linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, qemu-devel@nongnu.org Cc: aarcange@redhat.com, ak@linux.intel.com, akpm@linux-foundation.org, arnd@arndb.de, bfields@fieldses.org, bp@alien8.de, chao.p.peng@linux.intel.com, corbet@lwn.net, dave.hansen@intel.com, david@redhat.com, ddutile@redhat.com, dhildenb@redhat.com, hpa@zytor.com, hughd@google.com, jlayton@kernel.org, jmattson@google.com, joro@8bytes.org, jun.nakajima@intel.com, kirill.shutemov@linux.intel.com, linmiaohe@huawei.com, luto@kernel.org, mail@maciej.szmigiero.name, mhocko@suse.com, michael.roth@amd.com, mingo@redhat.com, naoya.horiguchi@nec.com, pbonzini@redhat.com, qperret@google.com, rppt@kernel.org, seanjc@google.com, shuah@kernel.org, steven.price@arm.com, tabba@google.com, tglx@linutronix.de, vannapurve@google.com, vbabka@suse.cz, vkuznets@redhat.com, wanpengli@tencent.com, wei.w.wang@intel.com, x86@kernel.org, yu.c.zhang@linux.intel.com, Ackerley Tng Received-SPF: pass client-ip=2607:f8b0:4864:20::1149; envelope-from=3Ix_wYwsKCkgkmuo1vo83xqqyyqvo.myw0ow4-no5ovxyxqx4.y1q@flex--ackerleytng.bounces.google.com; helo=mail-yw1-x1149.google.com X-Spam_score_int: -95 X-Spam_score: -9.6 X-Spam_bar: --------- X-Spam_report: (-9.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Allow userspace to hint the kernel to use Transparent HugePages to back restricted memory on a per-file basis. Signed-off-by: Ackerley Tng --- include/uapi/linux/restrictedmem.h | 1 + mm/restrictedmem.c | 27 +++++++++++++++++---------- 2 files changed, 18 insertions(+), 10 deletions(-) diff --git a/include/uapi/linux/restrictedmem.h b/include/uapi/linux/restrictedmem.h index 9f108dd1ac4c..f671ccbb43bc 100644 --- a/include/uapi/linux/restrictedmem.h +++ b/include/uapi/linux/restrictedmem.h @@ -4,5 +4,6 @@ /* flags for memfd_restricted */ #define RMFD_TMPFILE 0x0001U +#define RMFD_HUGEPAGE 0x0002U #endif /* _UAPI_LINUX_RESTRICTEDMEM_H */ diff --git a/mm/restrictedmem.c b/mm/restrictedmem.c index 97f3e2159e8b..87c829960b31 100644 --- a/mm/restrictedmem.c +++ b/mm/restrictedmem.c @@ -190,19 +190,25 @@ static struct file *restrictedmem_file_create(struct file *memfd) return file; } -static int restrictedmem_create(struct vfsmount *mount) +static int restrictedmem_create(unsigned int flags, struct vfsmount *mount) { struct file *file, *restricted_file; int fd, err; + unsigned long shmem_setup_flags = VM_NORESERVE; fd = get_unused_fd_flags(0); if (fd < 0) return fd; - if (mount) - file = shmem_file_setup_with_mnt(mount, "memfd:restrictedmem", 0, VM_NORESERVE); - else - file = shmem_file_setup("memfd:restrictedmem", 0, VM_NORESERVE); + if (flags & RMFD_HUGEPAGE) + shmem_setup_flags |= VM_HUGEPAGE; + + if (mount) { + file = shmem_file_setup_with_mnt(mount, "memfd:restrictedmem", + 0, shmem_setup_flags); + } else { + file = shmem_file_setup("memfd:restrictedmem", 0, shmem_setup_flags); + } if (IS_ERR(file)) { err = PTR_ERR(file); @@ -230,7 +236,8 @@ static bool is_shmem_mount(struct vfsmount *mnt) return mnt->mnt_sb->s_magic == TMPFS_MAGIC; } -static int restrictedmem_create_from_path(const char __user *mount_path) +static int restrictedmem_create_from_path(unsigned int flags, + const char __user *mount_path) { int ret; struct path path; @@ -250,7 +257,7 @@ static int restrictedmem_create_from_path(const char __user *mount_path) if (unlikely(ret)) goto out; - ret = restrictedmem_create(path.mnt); + ret = restrictedmem_create(flags, path.mnt); mnt_drop_write(path.mnt); out: @@ -261,16 +268,16 @@ static int restrictedmem_create_from_path(const char __user *mount_path) SYSCALL_DEFINE2(memfd_restricted, unsigned int, flags, const char __user *, mount_path) { - if (flags & ~RMFD_TMPFILE) + if (flags & ~(RMFD_TMPFILE | RMFD_HUGEPAGE)) return -EINVAL; if (flags == RMFD_TMPFILE) { if (!mount_path) return -EINVAL; - return restrictedmem_create_from_path(mount_path); + return restrictedmem_create_from_path(flags, mount_path); } else { - return restrictedmem_create(NULL); + return restrictedmem_create(flags, NULL); } } From patchwork Sat Feb 18 00:43:02 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ackerley Tng X-Patchwork-Id: 1744489 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; 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Fri, 17 Feb 2023 16:43:21 -0800 (PST) Date: Sat, 18 Feb 2023 00:43:02 +0000 In-Reply-To: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.39.2.637.g21b0678d19-goog Message-ID: <67956539824ea9dd66a94d67b046b2f4bb0aa6f2.1676680548.git.ackerleytng@google.com> Subject: [RFC PATCH 2/2] selftests: restrictedmem: Add selftest for RMFD_HUGEPAGE From: Ackerley Tng To: kvm@vger.kernel.org, linux-api@vger.kernel.org, linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, qemu-devel@nongnu.org Cc: aarcange@redhat.com, ak@linux.intel.com, akpm@linux-foundation.org, arnd@arndb.de, bfields@fieldses.org, bp@alien8.de, chao.p.peng@linux.intel.com, corbet@lwn.net, dave.hansen@intel.com, david@redhat.com, ddutile@redhat.com, dhildenb@redhat.com, hpa@zytor.com, hughd@google.com, jlayton@kernel.org, jmattson@google.com, joro@8bytes.org, jun.nakajima@intel.com, kirill.shutemov@linux.intel.com, linmiaohe@huawei.com, luto@kernel.org, mail@maciej.szmigiero.name, mhocko@suse.com, michael.roth@amd.com, mingo@redhat.com, naoya.horiguchi@nec.com, pbonzini@redhat.com, qperret@google.com, rppt@kernel.org, seanjc@google.com, shuah@kernel.org, steven.price@arm.com, tabba@google.com, tglx@linutronix.de, vannapurve@google.com, vbabka@suse.cz, vkuznets@redhat.com, wanpengli@tencent.com, wei.w.wang@intel.com, x86@kernel.org, yu.c.zhang@linux.intel.com, Ackerley Tng Received-SPF: pass client-ip=2607:f8b0:4864:20::b4a; envelope-from=3KR_wYwsKCk4qs0u71uE93ww44w1u.s426u2A-tuBu1343w3A.47w@flex--ackerleytng.bounces.google.com; helo=mail-yb1-xb4a.google.com X-Spam_score_int: -95 X-Spam_score: -9.6 X-Spam_bar: --------- X-Spam_report: (-9.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Tests that when RMFD_HUGEPAGE is specified, restrictedmem will be backed by Transparent HugePages. Signed-off-by: Ackerley Tng --- .../restrictedmem_hugepage_test.c | 25 +++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/tools/testing/selftests/restrictedmem/restrictedmem_hugepage_test.c b/tools/testing/selftests/restrictedmem/restrictedmem_hugepage_test.c index 0d9cf2ced754..75283d68696f 100644 --- a/tools/testing/selftests/restrictedmem/restrictedmem_hugepage_test.c +++ b/tools/testing/selftests/restrictedmem/restrictedmem_hugepage_test.c @@ -180,6 +180,31 @@ TEST_F(reset_shmem_enabled, restrictedmem_fstat_shmem_enabled_always) close(mfd); } +TEST(restrictedmem_invalid_flags) +{ + int mfd = memfd_restricted(99, NULL); + + ASSERT_EQ(-1, mfd); + ASSERT_EQ(EINVAL, errno); +} + +TEST_F(reset_shmem_enabled, restrictedmem_rmfd_hugepage) +{ + int mfd = -1; + struct stat stat; + + ASSERT_EQ(0, set_shmem_thp_policy("never")); + + mfd = memfd_restricted(RMFD_HUGEPAGE, NULL); + ASSERT_NE(-1, mfd); + + ASSERT_EQ(0, fstat(mfd, &stat)); + + ASSERT_EQ(stat.st_blksize, get_hpage_pmd_size()); + + close(mfd); +} + TEST(restrictedmem_tmpfile_no_mount_path) { int mfd = memfd_restricted(RMFD_TMPFILE, NULL);