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b=hdxETzlYOYOWvXH3q86eaH3Tcmbd4oqURs55k1ia508fxvTigLoOA222ptdt5lojzy nRyopB2z3mdMJClnw8Hdha69ldS26TMC/ADIVonolnUYJxtM6P8CbUYe/Yi4vwbSX2Ii bzihXkXturWez/EM0665IUJ0gd5xVVwOOF1wu+1OZdrnDWGgrlUGTCoA5NcoE4C43RH+ t88irALLRrXb1EOi3clB4V8ARNixijsdqNIT/H4OvumKv2XGVG07wXG/TrT7eCZf77O5 0FOuhBse7Tf2+wL29VCLH8FO4sS8xD/T2gC4WVaViLe94iZefZxjsSshAU6A2HwO0aKp FX4g== X-Gm-Message-State: AO0yUKUxV9AViOPhOOjcm84kO/CRxcxX9fLDknZ11FWaKWkK2bcOxDXG DrCmgUQjC4UGfB9Jdnd9KdMeWjSMSCcn/bvHTg== X-Google-Smtp-Source: AK7set/gCiyNU2zsSUQcnpfweO59d4+LMWomYJ6sq6DKFLDhVfbtMpiT7MZoq2d4nExGworQhG3UEyTFbFT8aAYUHA== X-Received: from ackerleytng-cloudtop.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:1f5f]) (user=ackerleytng job=sendgmr) by 2002:a05:6902:1024:b0:8fc:686c:cf87 with SMTP id x4-20020a056902102400b008fc686ccf87mr57267ybt.4.1676680995496; 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 (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @google.com) X-ZM-MESSAGEID: 1676681046011100005 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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/restri= ctedmem.h index 9f108dd1ac4c..f671ccbb43bc 100644 --- a/include/uapi/linux/restrictedmem.h +++ b/include/uapi/linux/restrictedmem.h @@ -4,5 +4,6 @@ =20 /* flags for memfd_restricted */ #define RMFD_TMPFILE 0x0001U +#define RMFD_HUGEPAGE 0x0002U =20 #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; } =20 -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 =3D VM_NORESERVE; =20 fd =3D get_unused_fd_flags(0); if (fd < 0) return fd; =20 - if (mount) - file =3D shmem_file_setup_with_mnt(mount, "memfd:restrictedmem", 0, VM_N= ORESERVE); - else - file =3D shmem_file_setup("memfd:restrictedmem", 0, VM_NORESERVE); + if (flags & RMFD_HUGEPAGE) + shmem_setup_flags |=3D VM_HUGEPAGE; + + if (mount) { + file =3D shmem_file_setup_with_mnt(mount, "memfd:restrictedmem", + 0, shmem_setup_flags); + } else { + file =3D shmem_file_setup("memfd:restrictedmem", 0, shmem_setup_flags); + } =20 if (IS_ERR(file)) { err =3D PTR_ERR(file); @@ -230,7 +236,8 @@ static bool is_shmem_mount(struct vfsmount *mnt) return mnt->mnt_sb->s_magic =3D=3D TMPFS_MAGIC; } =20 -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; =20 - ret =3D restrictedmem_create(path.mnt); + ret =3D restrictedmem_create(flags, path.mnt); =20 mnt_drop_write(path.mnt); out: @@ -261,16 +268,16 @@ static int restrictedmem_create_from_path(const char = __user *mount_path) =20 SYSCALL_DEFINE2(memfd_restricted, unsigned int, flags, const char __user *= , mount_path) { - if (flags & ~RMFD_TMPFILE) + if (flags & ~(RMFD_TMPFILE | RMFD_HUGEPAGE)) return -EINVAL; =20 if (flags =3D=3D RMFD_TMPFILE) { if (!mount_path) return -EINVAL; =20 - 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); } } =20 --=20 2.39.2.637.g21b0678d19-goog From nobody Sat May 18 17:15:58 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=reject dis=none) header.from=google.com ARC-Seal: i=1; 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charset="utf-8" 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_t= est.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); } =20 +TEST(restrictedmem_invalid_flags) +{ + int mfd =3D memfd_restricted(99, NULL); + + ASSERT_EQ(-1, mfd); + ASSERT_EQ(EINVAL, errno); +} + +TEST_F(reset_shmem_enabled, restrictedmem_rmfd_hugepage) +{ + int mfd =3D -1; + struct stat stat; + + ASSERT_EQ(0, set_shmem_thp_policy("never")); + + mfd =3D 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 =3D memfd_restricted(RMFD_TMPFILE, NULL); --=20 2.39.2.637.g21b0678d19-goog