From: Mike Rapoport <rppt@kernel.org>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Andy Lutomirski <luto@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
Borislav Petkov <bp@alien8.de>,
Christopher Lameter <cl@linux.com>,
Dan Williams <dan.j.williams@intel.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
David Hildenbrand <david@redhat.com>,
Elena Reshetova <elena.reshetova@intel.com>,
"H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
James Bottomley <jejb@linux.ibm.com>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
Matthew Wilcox <willy@infradead.org>,
Mark Rutland <mark.rutland@arm.com>,
Mike Rapoport <rppt@linux.ibm.com>,
Michael Kerrisk <mtk.manpages@gmail.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
Peter Zijlstra <peterz@infradead.org>,
Rick Edgecombe <rick.p.edgecombe@intel.com>,
Roman Gushchin <guro@fb.com>, Shuah Khan <shuah@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Tycho Andersen <tycho@tycho.ws>, Will Deacon <will@kernel.org>,
linux-api@vger.kernel.org, linux-arch@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
linux-nvdimm@lists.01.org, linux-riscv@lists.infradead.org,
x86@kernel.org, Palmer Dabbelt <palmerdabbelt@google.com>
Subject: Re: [PATCH v9 8/9] arch, mm: wire up memfd_secret system call were relevant
Date: Wed, 18 Nov 2020 08:57:06 +0200 [thread overview]
Message-ID: <20201118065706.GL370813@kernel.org> (raw)
In-Reply-To: <X7QFMhQlyBMI1wXE@trantor>
On Tue, Nov 17, 2020 at 05:15:30PM +0000, Catalin Marinas wrote:
> On Tue, Nov 17, 2020 at 06:29:31PM +0200, Mike Rapoport wrote:
> > From: Mike Rapoport <rppt@linux.ibm.com>
> >
> > Wire up memfd_secret system call on architectures that define
> > ARCH_HAS_SET_DIRECT_MAP, namely arm64, risc-v and x86.
> >
> > Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
> > Acked-by: Palmer Dabbelt <palmerdabbelt@google.com>
> > Acked-by: Arnd Bergmann <arnd@arndb.de>
> > ---
> > arch/arm64/include/asm/unistd.h | 2 +-
> > arch/arm64/include/asm/unistd32.h | 2 ++
> > arch/arm64/include/uapi/asm/unistd.h | 1 +
> > arch/riscv/include/asm/unistd.h | 1 +
> > arch/x86/entry/syscalls/syscall_32.tbl | 1 +
> > arch/x86/entry/syscalls/syscall_64.tbl | 1 +
> > include/linux/syscalls.h | 1 +
> > include/uapi/asm-generic/unistd.h | 6 +++++-
> > scripts/checksyscalls.sh | 4 ++++
> > 9 files changed, 17 insertions(+), 2 deletions(-)
> >
> > diff --git a/arch/arm64/include/asm/unistd.h b/arch/arm64/include/asm/unistd.h
> > index 86a9d7b3eabe..949788f5ba40 100644
> > --- a/arch/arm64/include/asm/unistd.h
> > +++ b/arch/arm64/include/asm/unistd.h
> > @@ -38,7 +38,7 @@
> > #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 442
> > +#define __NR_compat_syscalls 443
> > #endif
> >
> > #define __ARCH_WANT_SYS_CLONE
> > diff --git a/arch/arm64/include/asm/unistd32.h b/arch/arm64/include/asm/unistd32.h
> > index 6c1dcca067e0..5279481ec95b 100644
> > --- a/arch/arm64/include/asm/unistd32.h
> > +++ b/arch/arm64/include/asm/unistd32.h
> > @@ -891,6 +891,8 @@ __SYSCALL(__NR_faccessat2, sys_faccessat2)
> > __SYSCALL(__NR_process_madvise, sys_process_madvise)
> > #define __NR_watch_mount 441
> > __SYSCALL(__NR_watch_mount, sys_watch_mount)
> > +/* 442 is memfd_secret, it is not implemented for 32-bit */
> > +__SYSCALL(442, sys_ni_syscall)
>
> It now behaves correctly for compat but I don't think we need to
> increment __NR_compat_syscalls. The compat syscall handler already calls
> sys_ni_syscall() if out of range.
Ok, let's drop this change as well :)
> So the only arm64 change needed is defining __ARCH_WANT_MEMFD_SECRET
> (well, we don't have a use for it yet ;)).
>
> --
> Catalin
--
Sincerely yours,
Mike.
next prev parent reply other threads:[~2020-11-18 6:57 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-17 16:29 [PATCH v9 0/9] mm: introduce memfd_secret system call to create "secret" memory areas Mike Rapoport
2020-11-17 16:29 ` [PATCH v9 1/9] mm: add definition of PMD_PAGE_ORDER Mike Rapoport
2020-11-17 16:29 ` [PATCH v9 2/9] mmap: make mlock_future_check() global Mike Rapoport
2020-11-17 16:29 ` [PATCH v9 3/9] set_memory: allow set_direct_map_*_noflush() for multiple pages Mike Rapoport
2020-11-17 16:29 ` [PATCH v9 4/9] mm: introduce memfd_secret system call to create "secret" memory areas Mike Rapoport
2020-11-17 16:29 ` [PATCH v9 5/9] secretmem: use PMD-size pages to amortize direct map fragmentation Mike Rapoport
2020-11-17 16:29 ` [PATCH v9 6/9] secretmem: add memcg accounting Mike Rapoport
2020-11-17 19:33 ` Roman Gushchin
2020-11-17 20:02 ` Shakeel Butt
2020-11-18 6:55 ` Mike Rapoport
2020-11-17 16:29 ` [PATCH v9 7/9] PM: hibernate: disable when there are active secretmem users Mike Rapoport
2020-11-17 16:29 ` [PATCH v9 8/9] arch, mm: wire up memfd_secret system call were relevant Mike Rapoport
2020-11-17 17:15 ` Catalin Marinas
2020-11-18 6:57 ` Mike Rapoport [this message]
2020-11-17 16:29 ` [PATCH v9 9/9] secretmem: test: add basic selftest for memfd_secret(2) Mike Rapoport
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