loongarch: wire up memfd_secret system call

[PATCH] loongarch: wire up memfd_secret system call

Posted by Lain Fearyncess Yang 1 month ago

From: "Lain \"Fearyncess\" Yang" <fearyncess@aosc.io>

LoongArch supports ARCH_HAS_SET_DIRECT_MAP, therefore wire up the
memfd_secret system call, which depends on it.

Signed-off-by: Lain "Fearyncess" Yang <fearyncess@aosc.io>
---
 arch/loongarch/include/asm/unistd.h     | 1 +
 arch/loongarch/kernel/Makefile.syscalls | 6 +++---
 tools/testing/selftests/mm/Makefile     | 2 +-
 3 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/loongarch/include/asm/unistd.h b/arch/loongarch/include/asm/unistd.h
index e2c0f3d86c7bd..e7649c1582482 100644
--- a/arch/loongarch/include/asm/unistd.h
+++ b/arch/loongarch/include/asm/unistd.h
@@ -10,5 +10,6 @@
 
 #define __ARCH_WANT_NEW_STAT
 #define __ARCH_WANT_SYS_CLONE
+#define __ARCH_WANT_MEMFD_SECRET
 
 #define NR_syscalls (__NR_syscalls)
diff --git a/arch/loongarch/kernel/Makefile.syscalls b/arch/loongarch/kernel/Makefile.syscalls
index cd46c2b69c7fd..6360381baf931 100644
--- a/arch/loongarch/kernel/Makefile.syscalls
+++ b/arch/loongarch/kernel/Makefile.syscalls
@@ -1,5 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0
 
-# No special ABIs on loongarch so far
-syscall_abis_32 +=
-syscall_abis_64 +=
+# Add memfd_secret explictly for la64 and la32
+syscall_abis_32 += memfd_secret
+syscall_abis_64 += memfd_secret
diff --git a/tools/testing/selftests/mm/Makefile b/tools/testing/selftests/mm/Makefile
index eaf9312097f7b..79582438efc4d 100644
--- a/tools/testing/selftests/mm/Makefile
+++ b/tools/testing/selftests/mm/Makefile
@@ -72,7 +72,7 @@ TEST_GEN_FILES += madv_populate
 TEST_GEN_FILES += map_fixed_noreplace
 TEST_GEN_FILES += map_hugetlb
 TEST_GEN_FILES += map_populate
-ifneq (,$(filter $(ARCH),arm64 riscv riscv64 x86 x86_64))
+ifneq (,$(filter $(ARCH),arm64 riscv riscv64 x86 x86_64 loongarch32 loongarch64))
 TEST_GEN_FILES += memfd_secret
 endif
 TEST_GEN_FILES += migration
-- 
2.52.0

Re: [PATCH] loongarch: wire up memfd_secret system call

Posted by Huacai Chen 2 weeks ago

Applied, thanks.

Huacai

On Fri, Jan 9, 2026 at 1:11 PM Lain Fearyncess Yang <fearyncess@aosc.io> wrote:
>
> From: "Lain \"Fearyncess\" Yang" <fearyncess@aosc.io>
>
> LoongArch supports ARCH_HAS_SET_DIRECT_MAP, therefore wire up the
> memfd_secret system call, which depends on it.
>
> Signed-off-by: Lain "Fearyncess" Yang <fearyncess@aosc.io>
> ---
>  arch/loongarch/include/asm/unistd.h     | 1 +
>  arch/loongarch/kernel/Makefile.syscalls | 6 +++---
>  tools/testing/selftests/mm/Makefile     | 2 +-
>  3 files changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/arch/loongarch/include/asm/unistd.h b/arch/loongarch/include/asm/unistd.h
> index e2c0f3d86c7bd..e7649c1582482 100644
> --- a/arch/loongarch/include/asm/unistd.h
> +++ b/arch/loongarch/include/asm/unistd.h
> @@ -10,5 +10,6 @@
>
>  #define __ARCH_WANT_NEW_STAT
>  #define __ARCH_WANT_SYS_CLONE
> +#define __ARCH_WANT_MEMFD_SECRET
>
>  #define NR_syscalls (__NR_syscalls)
> diff --git a/arch/loongarch/kernel/Makefile.syscalls b/arch/loongarch/kernel/Makefile.syscalls
> index cd46c2b69c7fd..6360381baf931 100644
> --- a/arch/loongarch/kernel/Makefile.syscalls
> +++ b/arch/loongarch/kernel/Makefile.syscalls
> @@ -1,5 +1,5 @@
>  # SPDX-License-Identifier: GPL-2.0
>
> -# No special ABIs on loongarch so far
> -syscall_abis_32 +=
> -syscall_abis_64 +=
> +# Add memfd_secret explictly for la64 and la32
> +syscall_abis_32 += memfd_secret
> +syscall_abis_64 += memfd_secret
> diff --git a/tools/testing/selftests/mm/Makefile b/tools/testing/selftests/mm/Makefile
> index eaf9312097f7b..79582438efc4d 100644
> --- a/tools/testing/selftests/mm/Makefile
> +++ b/tools/testing/selftests/mm/Makefile
> @@ -72,7 +72,7 @@ TEST_GEN_FILES += madv_populate
>  TEST_GEN_FILES += map_fixed_noreplace
>  TEST_GEN_FILES += map_hugetlb
>  TEST_GEN_FILES += map_populate
> -ifneq (,$(filter $(ARCH),arm64 riscv riscv64 x86 x86_64))
> +ifneq (,$(filter $(ARCH),arm64 riscv riscv64 x86 x86_64 loongarch32 loongarch64))
>  TEST_GEN_FILES += memfd_secret
>  endif
>  TEST_GEN_FILES += migration
> --
> 2.52.0
>

Re: [PATCH] loongarch: wire up memfd_secret system call

Posted by David Hildenbrand (Red Hat) 1 month ago

On 1/9/26 06:10, Lain Fearyncess Yang wrote:
> From: "Lain \"Fearyncess\" Yang" <fearyncess@aosc.io>
> 
> LoongArch supports ARCH_HAS_SET_DIRECT_MAP, therefore wire up the
> memfd_secret system call, which depends on it.
> 
> Signed-off-by: Lain "Fearyncess" Yang <fearyncess@aosc.io>
> ---
>   arch/loongarch/include/asm/unistd.h     | 1 +
>   arch/loongarch/kernel/Makefile.syscalls | 6 +++---
>   tools/testing/selftests/mm/Makefile     | 2 +-
>   3 files changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/loongarch/include/asm/unistd.h b/arch/loongarch/include/asm/unistd.h
> index e2c0f3d86c7bd..e7649c1582482 100644
> --- a/arch/loongarch/include/asm/unistd.h
> +++ b/arch/loongarch/include/asm/unistd.h
> @@ -10,5 +10,6 @@
>   
>   #define __ARCH_WANT_NEW_STAT
>   #define __ARCH_WANT_SYS_CLONE
> +#define __ARCH_WANT_MEMFD_SECRET
>   
>   #define NR_syscalls (__NR_syscalls)
> diff --git a/arch/loongarch/kernel/Makefile.syscalls b/arch/loongarch/kernel/Makefile.syscalls
> index cd46c2b69c7fd..6360381baf931 100644
> --- a/arch/loongarch/kernel/Makefile.syscalls
> +++ b/arch/loongarch/kernel/Makefile.syscalls
> @@ -1,5 +1,5 @@
>   # SPDX-License-Identifier: GPL-2.0
>   
> -# No special ABIs on loongarch so far
> -syscall_abis_32 +=
> -syscall_abis_64 +=
> +# Add memfd_secret explictly for la64 and la32
> +syscall_abis_32 += memfd_secret
> +syscall_abis_64 += memfd_secret
> diff --git a/tools/testing/selftests/mm/Makefile b/tools/testing/selftests/mm/Makefile
> index eaf9312097f7b..79582438efc4d 100644
> --- a/tools/testing/selftests/mm/Makefile
> +++ b/tools/testing/selftests/mm/Makefile
> @@ -72,7 +72,7 @@ TEST_GEN_FILES += madv_populate
>   TEST_GEN_FILES += map_fixed_noreplace
>   TEST_GEN_FILES += map_hugetlb
>   TEST_GEN_FILES += map_populate
> -ifneq (,$(filter $(ARCH),arm64 riscv riscv64 x86 x86_64))
> +ifneq (,$(filter $(ARCH),arm64 riscv riscv64 x86 x86_64 loongarch32 loongarch64))

For the core-mm bits

Acked-by: David Hildenbrand (Red Hat) <david@kernel.org>

-- 
Cheers

David

Re: [PATCH] loongarch: wire up memfd_secret system call

Posted by Mike Rapoport 1 month ago

On Fri, Jan 09, 2026 at 01:10:51PM +0800, Lain Fearyncess Yang wrote:
> From: "Lain \"Fearyncess\" Yang" <fearyncess@aosc.io>
> 
> LoongArch supports ARCH_HAS_SET_DIRECT_MAP, therefore wire up the
> memfd_secret system call, which depends on it.

LoongArch version of set_memory* does not support splitting of leaf PMD
entries. Does LoongArch always use PTE-level mappings in the direct map?
 
> Signed-off-by: Lain "Fearyncess" Yang <fearyncess@aosc.io>
> ---
>  arch/loongarch/include/asm/unistd.h     | 1 +
>  arch/loongarch/kernel/Makefile.syscalls | 6 +++---
>  tools/testing/selftests/mm/Makefile     | 2 +-
>  3 files changed, 5 insertions(+), 4 deletions(-)

-- 
Sincerely yours,
Mike.

Re: [PATCH] loongarch: wire up memfd_secret system call

Posted by Huacai Chen 2 weeks ago

On Fri, Jan 9, 2026 at 4:21 PM Mike Rapoport <rppt@kernel.org> wrote:
>
> On Fri, Jan 09, 2026 at 01:10:51PM +0800, Lain Fearyncess Yang wrote:
> > From: "Lain \"Fearyncess\" Yang" <fearyncess@aosc.io>
> >
> > LoongArch supports ARCH_HAS_SET_DIRECT_MAP, therefore wire up the
> > memfd_secret system call, which depends on it.
>
> LoongArch version of set_memory* does not support splitting of leaf PMD
> entries. Does LoongArch always use PTE-level mappings in the direct map?
No PMD level mappings now.

Huacai
>
> > Signed-off-by: Lain "Fearyncess" Yang <fearyncess@aosc.io>
> > ---
> >  arch/loongarch/include/asm/unistd.h     | 1 +
> >  arch/loongarch/kernel/Makefile.syscalls | 6 +++---
> >  tools/testing/selftests/mm/Makefile     | 2 +-
> >  3 files changed, 5 insertions(+), 4 deletions(-)
>
> --
> Sincerely yours,
> Mike.

Re: [PATCH] loongarch: wire up memfd_secret system call

Posted by Mike Rapoport 2 weeks ago

On Sun, Jan 25, 2026 at 12:03:25PM +0800, Huacai Chen wrote:
> On Fri, Jan 9, 2026 at 4:21 PM Mike Rapoport <rppt@kernel.org> wrote:
> >
> > On Fri, Jan 09, 2026 at 01:10:51PM +0800, Lain Fearyncess Yang wrote:
> > > From: "Lain \"Fearyncess\" Yang" <fearyncess@aosc.io>
> > >
> > > LoongArch supports ARCH_HAS_SET_DIRECT_MAP, therefore wire up the
> > > memfd_secret system call, which depends on it.
> >
> > LoongArch version of set_memory* does not support splitting of leaf PMD
> > entries. Does LoongArch always use PTE-level mappings in the direct map?
> No PMD level mappings now.

Thanks for the clarification. You can add

Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>

if it's not too late :)

> Huacai

-- 
Sincerely yours,
Mike.

Re: [PATCH] loongarch: wire up memfd_secret system call

Posted by Arnd Bergmann 1 month ago

On Fri, Jan 9, 2026, at 06:10, Lain Fearyncess Yang wrote:
> From: "Lain \"Fearyncess\" Yang" <fearyncess@aosc.io>
>
> LoongArch supports ARCH_HAS_SET_DIRECT_MAP, therefore wire up the
> memfd_secret system call, which depends on it.
>
> Signed-off-by: Lain "Fearyncess" Yang <fearyncess@aosc.io>
> ---

Acked-by: Arnd Bergmann <arnd@arndb.de>