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From: Gregory Price <gourry.memverge@gmail.com>
To: linux-mm@kvack.org
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	Hasan.Maruf@amd.com,
	seungjun.ha@samsung.com,
	Michal Hocko <mhocko@suse.com>,
	Frank van der Linden <fvdl@google.com>
Subject: [PATCH v5 10/11] mm/mempolicy: add the mbind2 syscall
Date: Sat, 23 Dec 2023 13:11:00 -0500
Message-Id: <20231223181101.1954-11-gregory.price@memverge.com>
In-Reply-To: <20231223181101.1954-1-gregory.price@memverge.com>
References: <20231223181101.1954-1-gregory.price@memverge.com>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

mbind2 is an extensible mbind interface which allows a user to
set the mempolicy for one or more address ranges.

Defined as:

mbind2(unsigned long addr, unsigned long len, struct mpol_args *args,
       size_t size, unsigned long flags)

addr:         address of the memory range to operate on
len:          length of the memory range
flags:        MPOL_MF_HOME_NODE + original mbind() flags

Input values include the following fields of mpol_args:

mode:         The MPOL_* policy (DEFAULT, INTERLEAVE, etc.)
mode_flags:   The MPOL_F_* flags that were previously passed in or'd
	      into the mode.  This was split to hopefully allow future
	      extensions additional mode/flag space.
home_node:    if (flags & MPOL_MF_HOME_NODE), set home node of policy
	      to this otherwise it is ignored.
pol_maxnodes: The max number of nodes described by pol_nodes
pol_nodes:    the nodemask to apply for the memory policy

The semantics are otherwise the same as mbind(), except that
the home_node can be set.

Suggested-by: Michal Hocko <mhocko@suse.com>
Suggested-by: Frank van der Linden <fvdl@google.com>
Suggested-by: Vinicius Tavares Petrucci <vtavarespetr@micron.com>
Suggested-by: Rakie Kim <rakie.kim@sk.com>
Suggested-by: Hyeongtak Ji <hyeongtak.ji@sk.com>
Suggested-by: Honggyu Kim <honggyu.kim@sk.com>
Signed-off-by: Gregory Price <gregory.price@memverge.com>
Co-developed-by: Vinicius Tavares Petrucci <vtavarespetr@micron.com>
---
 .../admin-guide/mm/numa_memory_policy.rst     | 12 +++++-
 arch/alpha/kernel/syscalls/syscall.tbl        |  1 +
 arch/arm/tools/syscall.tbl                    |  1 +
 arch/arm64/include/asm/unistd.h               |  2 +-
 arch/arm64/include/asm/unistd32.h             |  2 +
 arch/m68k/kernel/syscalls/syscall.tbl         |  1 +
 arch/microblaze/kernel/syscalls/syscall.tbl   |  1 +
 arch/mips/kernel/syscalls/syscall_n32.tbl     |  1 +
 arch/mips/kernel/syscalls/syscall_o32.tbl     |  1 +
 arch/parisc/kernel/syscalls/syscall.tbl       |  1 +
 arch/powerpc/kernel/syscalls/syscall.tbl      |  1 +
 arch/s390/kernel/syscalls/syscall.tbl         |  1 +
 arch/sh/kernel/syscalls/syscall.tbl           |  1 +
 arch/sparc/kernel/syscalls/syscall.tbl        |  1 +
 arch/x86/entry/syscalls/syscall_32.tbl        |  1 +
 arch/x86/entry/syscalls/syscall_64.tbl        |  1 +
 arch/xtensa/kernel/syscalls/syscall.tbl       |  1 +
 include/linux/syscalls.h                      |  3 ++
 include/uapi/asm-generic/unistd.h             |  4 +-
 include/uapi/linux/mempolicy.h                |  5 ++-
 kernel/sys_ni.c                               |  1 +
 mm/mempolicy.c                                | 43 +++++++++++++++++++
 .../arch/mips/entry/syscalls/syscall_n64.tbl  |  1 +
 .../arch/powerpc/entry/syscalls/syscall.tbl   |  1 +
 .../perf/arch/s390/entry/syscalls/syscall.tbl |  1 +
 .../arch/x86/entry/syscalls/syscall_64.tbl    |  1 +
 26 files changed, 85 insertions(+), 5 deletions(-)

diff --git a/Documentation/admin-guide/mm/numa_memory_policy.rst b/Documentation/admin-guide/mm/numa_memory_policy.rst
index f50b7f7ddbf9..7edee775cd2f 100644
--- a/Documentation/admin-guide/mm/numa_memory_policy.rst
+++ b/Documentation/admin-guide/mm/numa_memory_policy.rst
@@ -478,12 +478,18 @@ Install VMA/Shared Policy for a Range of Task's Address Space::
 	long mbind(void *start, unsigned long len, int mode,
 		   const unsigned long *nmask, unsigned long maxnode,
 		   unsigned flags);
+	long mbind2(void* start, unsigned long len, struct mpol_args args,
+		    size_t size, unsigned long flags);
 
 mbind() installs the policy specified by (mode, nmask, maxnodes) as a
 VMA policy for the range of the calling task's address space specified
 by the 'start' and 'len' arguments.  Additional actions may be
 requested via the 'flags' argument.
 
+mbind2() is an extended version of mbind() capable of setting extended
+mempolicy features. For example, one can set the home node for the memory
+policy without an additional call to set_mempolicy_home_node().
+
 See the mbind(2) man page for more details.
 
 Set home node for a Range of Task's Address Spacec::
@@ -499,6 +505,9 @@ closest to which page allocation will come from. Specifying the home node overri
 the default allocation policy to allocate memory close to the local node for an
 executing CPU.
 
+mbind2() also provides a way for the home node to be set at the time the
+mempolicy is set. See the mbind(2) man page for more details.
+
 Extended Mempolicy Arguments::
 
 	struct mpol_args {
@@ -512,7 +521,8 @@ Extended Mempolicy Arguments::
 The extended mempolicy argument structure is defined to allow the mempolicy
 interfaces future extensibility without the need for additional system calls.
 
-Extended interfaces (set_mempolicy2 and get_mempolicy2) use this structure.
+Extended interfaces (set_mempolicy2, get_mempolicy2, and mbind2) use this
+this argument structure.
 
 The core arguments (mode, mode_flags, pol_nodes, and pol_maxnodes) apply to
 all interfaces relative to their non-extended counterparts. Each additional
diff --git a/arch/alpha/kernel/syscalls/syscall.tbl b/arch/alpha/kernel/syscalls/syscall.tbl
index 0301a8b0a262..e8239293c35a 100644
--- a/arch/alpha/kernel/syscalls/syscall.tbl
+++ b/arch/alpha/kernel/syscalls/syscall.tbl
@@ -498,3 +498,4 @@
 566	common	futex_requeue			sys_futex_requeue
 567	common	set_mempolicy2			sys_set_mempolicy2
 568	common	get_mempolicy2			sys_get_mempolicy2
+569	common	mbind2				sys_mbind2
diff --git a/arch/arm/tools/syscall.tbl b/arch/arm/tools/syscall.tbl
index 771a33446e8e..a3f39750257a 100644
--- a/arch/arm/tools/syscall.tbl
+++ b/arch/arm/tools/syscall.tbl
@@ -472,3 +472,4 @@
 456	common	futex_requeue			sys_futex_requeue
 457	common	set_mempolicy2			sys_set_mempolicy2
 458	common	get_mempolicy2			sys_get_mempolicy2
+459	common	mbind2				sys_mbind2
diff --git a/arch/arm64/include/asm/unistd.h b/arch/arm64/include/asm/unistd.h
index b63f870debaf..abe10a833fcd 100644
--- a/arch/arm64/include/asm/unistd.h
+++ b/arch/arm64/include/asm/unistd.h
@@ -39,7 +39,7 @@
 #define __ARM_NR_compat_set_tls		(__ARM_NR_COMPAT_BASE + 5)
 #define __ARM_NR_COMPAT_END		(__ARM_NR_COMPAT_BASE + 0x800)
 
-#define __NR_compat_syscalls		459
+#define __NR_compat_syscalls		460
 #endif
 
 #define __ARCH_WANT_SYS_CLONE
diff --git a/arch/arm64/include/asm/unistd32.h b/arch/arm64/include/asm/unistd32.h
index f8d01007aee0..446b7f034332 100644
--- a/arch/arm64/include/asm/unistd32.h
+++ b/arch/arm64/include/asm/unistd32.h
@@ -923,6 +923,8 @@ __SYSCALL(__NR_futex_requeue, sys_futex_requeue)
 __SYSCALL(__NR_set_mempolicy2, sys_set_mempolicy2)
 #define __NR_get_mempolicy2 458
 __SYSCALL(__NR_get_mempolicy2, sys_get_mempolicy2)
+#define __NR_mbind2 459
+__SYSCALL(__NR_mbind2, sys_mbind2)
 
 /*
  * Please add new compat syscalls above this comment and update
diff --git a/arch/m68k/kernel/syscalls/syscall.tbl b/arch/m68k/kernel/syscalls/syscall.tbl
index 048a409e684c..9a12dface18e 100644
--- a/arch/m68k/kernel/syscalls/syscall.tbl
+++ b/arch/m68k/kernel/syscalls/syscall.tbl
@@ -458,3 +458,4 @@
 456	common	futex_requeue			sys_futex_requeue
 457	common	set_mempolicy2			sys_set_mempolicy2
 458	common	get_mempolicy2			sys_get_mempolicy2
+459	common	mbind2				sys_mbind2
diff --git a/arch/microblaze/kernel/syscalls/syscall.tbl b/arch/microblaze/kernel/syscalls/syscall.tbl
index 327b01bd6793..6cb740123137 100644
--- a/arch/microblaze/kernel/syscalls/syscall.tbl
+++ b/arch/microblaze/kernel/syscalls/syscall.tbl
@@ -464,3 +464,4 @@
 456	common	futex_requeue			sys_futex_requeue
 457	common	set_mempolicy2			sys_set_mempolicy2
 458	common	get_mempolicy2			sys_get_mempolicy2
+459	common	mbind2				sys_mbind2
diff --git a/arch/mips/kernel/syscalls/syscall_n32.tbl b/arch/mips/kernel/syscalls/syscall_n32.tbl
index 921d58e1da23..52cf720f8ae2 100644
--- a/arch/mips/kernel/syscalls/syscall_n32.tbl
+++ b/arch/mips/kernel/syscalls/syscall_n32.tbl
@@ -397,3 +397,4 @@
 456	n32	futex_requeue			sys_futex_requeue
 457	n32	set_mempolicy2			sys_set_mempolicy2
 458	n32	get_mempolicy2			sys_get_mempolicy2
+459	n32	mbind2				sys_mbind2
diff --git a/arch/mips/kernel/syscalls/syscall_o32.tbl b/arch/mips/kernel/syscalls/syscall_o32.tbl
index 9271c83c9993..fd37c5301a48 100644
--- a/arch/mips/kernel/syscalls/syscall_o32.tbl
+++ b/arch/mips/kernel/syscalls/syscall_o32.tbl
@@ -446,3 +446,4 @@
 456	o32	futex_requeue			sys_futex_requeue
 457	o32	set_mempolicy2			sys_set_mempolicy2
 458	o32	get_mempolicy2			sys_get_mempolicy2
+459	o32	mbind2				sys_mbind2
diff --git a/arch/parisc/kernel/syscalls/syscall.tbl b/arch/parisc/kernel/syscalls/syscall.tbl
index 0654f3f89fc7..fcd67bc405b1 100644
--- a/arch/parisc/kernel/syscalls/syscall.tbl
+++ b/arch/parisc/kernel/syscalls/syscall.tbl
@@ -457,3 +457,4 @@
 456	common	futex_requeue			sys_futex_requeue
 457	common	set_mempolicy2			sys_set_mempolicy2
 458	common	get_mempolicy2			sys_get_mempolicy2
+459	common	mbind2				sys_mbind2
diff --git a/arch/powerpc/kernel/syscalls/syscall.tbl b/arch/powerpc/kernel/syscalls/syscall.tbl
index ac11d2064e7a..89715417014c 100644
--- a/arch/powerpc/kernel/syscalls/syscall.tbl
+++ b/arch/powerpc/kernel/syscalls/syscall.tbl
@@ -545,3 +545,4 @@
 456	common	futex_requeue			sys_futex_requeue
 457	common	set_mempolicy2			sys_set_mempolicy2
 458	common	get_mempolicy2			sys_get_mempolicy2
+459	common	mbind2				sys_mbind2
diff --git a/arch/s390/kernel/syscalls/syscall.tbl b/arch/s390/kernel/syscalls/syscall.tbl
index 1cdcafe1ccca..c8304e0d0aa7 100644
--- a/arch/s390/kernel/syscalls/syscall.tbl
+++ b/arch/s390/kernel/syscalls/syscall.tbl
@@ -461,3 +461,4 @@
 456  common	futex_requeue		sys_futex_requeue		sys_futex_requeue
 457  common	set_mempolicy2		sys_set_mempolicy2		sys_set_mempolicy2
 458  common	get_mempolicy2		sys_get_mempolicy2		sys_get_mempolicy2
+459  common	mbind2			sys_mbind2			sys_mbind2
diff --git a/arch/sh/kernel/syscalls/syscall.tbl b/arch/sh/kernel/syscalls/syscall.tbl
index f71742024c29..e5c51b6c367f 100644
--- a/arch/sh/kernel/syscalls/syscall.tbl
+++ b/arch/sh/kernel/syscalls/syscall.tbl
@@ -461,3 +461,4 @@
 456	common	futex_requeue			sys_futex_requeue
 457	common	set_mempolicy2			sys_set_mempolicy2
 458	common	get_mempolicy2			sys_get_mempolicy2
+459	common	mbind2				sys_mbind2
diff --git a/arch/sparc/kernel/syscalls/syscall.tbl b/arch/sparc/kernel/syscalls/syscall.tbl
index 2fbf5dbe0620..74527f585500 100644
--- a/arch/sparc/kernel/syscalls/syscall.tbl
+++ b/arch/sparc/kernel/syscalls/syscall.tbl
@@ -504,3 +504,4 @@
 456	common	futex_requeue			sys_futex_requeue
 457	common	set_mempolicy2			sys_set_mempolicy2
 458	common	get_mempolicy2			sys_get_mempolicy2
+459	common	mbind2				sys_mbind2
diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl
index 0af813b9a118..be2e2aa17dd8 100644
--- a/arch/x86/entry/syscalls/syscall_32.tbl
+++ b/arch/x86/entry/syscalls/syscall_32.tbl
@@ -463,3 +463,4 @@
 456	i386	futex_requeue		sys_futex_requeue
 457	i386	set_mempolicy2		sys_set_mempolicy2
 458	i386	get_mempolicy2		sys_get_mempolicy2
+459	i386	mbind2			sys_mbind2
diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl
index 0b777876fc15..6e2347eb8773 100644
--- a/arch/x86/entry/syscalls/syscall_64.tbl
+++ b/arch/x86/entry/syscalls/syscall_64.tbl
@@ -380,6 +380,7 @@
 456	common	futex_requeue		sys_futex_requeue
 457	common	set_mempolicy2		sys_set_mempolicy2
 458	common	get_mempolicy2		sys_get_mempolicy2
+459	common	mbind2			sys_mbind2
 
 #
 # Due to a historical design error, certain syscalls are numbered differently
diff --git a/arch/xtensa/kernel/syscalls/syscall.tbl b/arch/xtensa/kernel/syscalls/syscall.tbl
index 4536c9a4227d..f00a21317dc0 100644
--- a/arch/xtensa/kernel/syscalls/syscall.tbl
+++ b/arch/xtensa/kernel/syscalls/syscall.tbl
@@ -429,3 +429,4 @@
 456	common	futex_requeue			sys_futex_requeue
 457	common	set_mempolicy2			sys_set_mempolicy2
 458	common	get_mempolicy2			sys_get_mempolicy2
+459	common	mbind2				sys_mbind2
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index f696855cbe8c..b42622ea9ed9 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -817,6 +817,9 @@ asmlinkage long sys_mbind(unsigned long start, unsigned long len,
 				const unsigned long __user *nmask,
 				unsigned long maxnode,
 				unsigned flags);
+asmlinkage long sys_mbind2(unsigned long start, unsigned long len,
+			   const struct mpol_args __user *uargs, size_t usize,
+			   unsigned long flags);
 asmlinkage long sys_get_mempolicy(int __user *policy,
 				unsigned long __user *nmask,
 				unsigned long maxnode,
diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
index 719accc731db..cd31599bb9cc 100644
--- a/include/uapi/asm-generic/unistd.h
+++ b/include/uapi/asm-generic/unistd.h
@@ -832,9 +832,11 @@ __SYSCALL(__NR_futex_requeue, sys_futex_requeue)
 __SYSCALL(__NR_set_mempolicy2, sys_set_mempolicy2)
 #define __NR_get_mempolicy2 458
 __SYSCALL(__NR_get_mempolicy2, sys_get_mempolicy2)
+#define __NR_mbind2 459
+__SYSCALL(__NR_mbind2, sys_mbind2)
 
 #undef __NR_syscalls
-#define __NR_syscalls 459
+#define __NR_syscalls 460
 
 /*
  * 32 bit systems traditionally used different
diff --git a/include/uapi/linux/mempolicy.h b/include/uapi/linux/mempolicy.h
index 4dd2d2e0d2ed..8880b753a446 100644
--- a/include/uapi/linux/mempolicy.h
+++ b/include/uapi/linux/mempolicy.h
@@ -52,13 +52,14 @@ struct mpol_args {
 #define MPOL_F_ADDR	(1<<1)	/* look up vma using address */
 #define MPOL_F_MEMS_ALLOWED (1<<2) /* return allowed memories */
 
-/* Flags for mbind */
+/* Flags for mbind/mbind2 */
 #define MPOL_MF_STRICT	(1<<0)	/* Verify existing pages in the mapping */
 #define MPOL_MF_MOVE	 (1<<1)	/* Move pages owned by this process to conform
 				   to policy */
 #define MPOL_MF_MOVE_ALL (1<<2)	/* Move every page to conform to policy */
 #define MPOL_MF_LAZY	 (1<<3)	/* UNSUPPORTED FLAG: Lazy migrate on fault */
-#define MPOL_MF_INTERNAL (1<<4)	/* Internal flags start here */
+#define MPOL_MF_HOME_NODE (1<<4)	/* mbind2: set home node */
+#define MPOL_MF_INTERNAL (1<<5)	/* Internal flags start here */
 
 #define MPOL_MF_VALID	(MPOL_MF_STRICT   | 	\
 			 MPOL_MF_MOVE     | 	\
diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
index 6afbd3a41319..2483b5afa99f 100644
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c
@@ -187,6 +187,7 @@ COND_SYSCALL(process_madvise);
 COND_SYSCALL(process_mrelease);
 COND_SYSCALL(remap_file_pages);
 COND_SYSCALL(mbind);
+COND_SYSCALL(mbind2);
 COND_SYSCALL(get_mempolicy);
 COND_SYSCALL(get_mempolicy2);
 COND_SYSCALL(set_mempolicy);
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index f2c12a8ff7b8..b5aca779249a 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1601,6 +1601,49 @@ SYSCALL_DEFINE6(mbind, unsigned long, start, unsigned long, len,
 	return kernel_mbind(start, len, mode, nmask, maxnode, flags);
 }
 
+SYSCALL_DEFINE5(mbind2, unsigned long, start, unsigned long, len,
+		const struct mpol_args __user *, uargs, size_t, usize,
+		unsigned long, flags)
+{
+	struct mpol_args kargs;
+	struct mempolicy_args margs;
+	nodemask_t policy_nodes;
+	unsigned long __user *nodes_ptr;
+	int err;
+
+	if (!start || !len)
+		return -EINVAL;
+
+	err = copy_struct_from_user(&kargs, sizeof(kargs), uargs, usize);
+	if (err)
+		return -EINVAL;
+
+	err = validate_mpol_flags(kargs.mode, &kargs.mode_flags);
+	if (err)
+		return err;
+
+	margs.mode = kargs.mode;
+	margs.mode_flags = kargs.mode_flags;
+
+	/* if home node given, validate it is online */
+	if (flags & MPOL_MF_HOME_NODE) {
+		if ((kargs.home_node >= MAX_NUMNODES) ||
+			!node_online(kargs.home_node))
+			return -EINVAL;
+		margs.home_node = kargs.home_node;
+	} else
+		margs.home_node = NUMA_NO_NODE;
+	flags &= ~MPOL_MF_HOME_NODE;
+
+	nodes_ptr = u64_to_user_ptr(kargs.pol_nodes);
+	err = get_nodes(&policy_nodes, nodes_ptr, kargs.pol_maxnodes);
+	if (err)
+		return err;
+	margs.policy_nodes = &policy_nodes;
+
+	return do_mbind(untagged_addr(start), len, &margs, flags);
+}
+
 /* Set the process memory policy */
 static long kernel_set_mempolicy(int mode, const unsigned long __user *nmask,
 				 unsigned long maxnode)
diff --git a/tools/perf/arch/mips/entry/syscalls/syscall_n64.tbl b/tools/perf/arch/mips/entry/syscalls/syscall_n64.tbl
index c34c6877379e..4fd9f742d903 100644
--- a/tools/perf/arch/mips/entry/syscalls/syscall_n64.tbl
+++ b/tools/perf/arch/mips/entry/syscalls/syscall_n64.tbl
@@ -373,3 +373,4 @@
 456	n64	futex_requeue			sys_futex_requeue
 457	n64	set_mempolicy2			sys_set_mempolicy2
 458	n64	get_mempolicy2			sys_get_mempolicy2
+459	n64	mbind2				sys_mbind2
diff --git a/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl b/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl
index ac11d2064e7a..89715417014c 100644
--- a/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl
+++ b/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl
@@ -545,3 +545,4 @@
 456	common	futex_requeue			sys_futex_requeue
 457	common	set_mempolicy2			sys_set_mempolicy2
 458	common	get_mempolicy2			sys_get_mempolicy2
+459	common	mbind2				sys_mbind2
diff --git a/tools/perf/arch/s390/entry/syscalls/syscall.tbl b/tools/perf/arch/s390/entry/syscalls/syscall.tbl
index 1cdcafe1ccca..c8304e0d0aa7 100644
--- a/tools/perf/arch/s390/entry/syscalls/syscall.tbl
+++ b/tools/perf/arch/s390/entry/syscalls/syscall.tbl
@@ -461,3 +461,4 @@
 456  common	futex_requeue		sys_futex_requeue		sys_futex_requeue
 457  common	set_mempolicy2		sys_set_mempolicy2		sys_set_mempolicy2
 458  common	get_mempolicy2		sys_get_mempolicy2		sys_get_mempolicy2
+459  common	mbind2			sys_mbind2			sys_mbind2
diff --git a/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl b/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl
index edf338f32645..3fc74241da5d 100644
--- a/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl
+++ b/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl
@@ -380,6 +380,7 @@
 456	common	futex_requeue		sys_futex_requeue
 457	common 	set_mempolicy2		sys_set_mempolicy2
 458	common 	get_mempolicy2		sys_get_mempolicy2
+459	common 	mbind2			sys_mbind2
 
 #
 # Due to a historical design error, certain syscalls are numbered differently
-- 
2.39.1