From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Andrew Morton <akpm@linux-foundation.org>,
Steven Rostedt <rostedt@goodmis.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Nicholas Piggin <npiggin@gmail.com>,
Naveen N Rao <naveen@kernel.org>,
Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>,
Bill Wendling <morbo@google.com>,
Justin Stitt <justinstitt@google.com>,
Shuah Khan <shuah@kernel.org>,
"Jason A . Donenfeld" <Jason@zx2c4.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>,
linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
linux-kselftest@vger.kernel.org, llvm@lists.linux.dev,
linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
linux-trace-kernel@vger.kernel.org,
Adhemerval Zanella <adhemerval.zanella@linaro.org>,
Xi Ruoyao <xry111@xry111.site>
Subject: [PATCH v3 0/5] Wire up getrandom() vDSO implementation on powerpc
Date: Fri, 30 Aug 2024 17:57:04 +0200 [thread overview]
Message-ID: <cover.1725031952.git.christophe.leroy@csgroup.eu> (raw)
This series wires up getrandom() vDSO implementation on powerpc.
Tested on PPC32 on real hardware.
Tested on PPC64 (both BE and LE) on QEMU:
Performance on powerpc 885:
~# ./vdso_test_getrandom bench-single
vdso: 25000000 times in 62.938002291 seconds
libc: 25000000 times in 535.581916866 seconds
syscall: 25000000 times in 531.525042806 seconds
Performance on powerpc 8321:
~# ./vdso_test_getrandom bench-single
vdso: 25000000 times in 16.899318858 seconds
libc: 25000000 times in 131.050596522 seconds
syscall: 25000000 times in 129.794790389 seconds
Performance on QEMU pseries:
~ # ./vdso_test_getrandom bench-single
vdso: 25000000 times in 4.977777162 seconds
libc: 25000000 times in 75.516749981 seconds
syscall: 25000000 times in 86.842242014 seconds
In order to run selftests, some fixes are needed, see
https://lore.kernel.org/linuxppc-dev/6c5da802e72befecfa09046c489aa45d934d611f.1725020674.git.christophe.leroy@csgroup.eu/
Those selftest fixes are independant and are not required to apply
and use this series.
Changes in v3:
- Rebased on recent random git tree (0c7e00e22c21)
- Fixed build failures reported by robots around VM_DROPPABLE
- Fixed crash on PPC64 due to clobbered r13 by not using r13 anymore (saving it was not enough for signals).
- Split final patch in two, first for PPC32, second for PPC64
- Moved selftest fixes out of this series
Changes in v2:
- Define VM_DROPPABLE for powerpc/32
- Fixes generic vDSO getrandom headers to enable CONFIG_COMPAT build.
- Fixed size of generation counter
- Fixed selftests to work on non x86 architectures
Christophe Leroy (5):
mm: Define VM_DROPPABLE for powerpc/32
powerpc/vdso32: Add crtsavres
powerpc/vdso: Refactor CFLAGS for CVDSO build
powerpc/vdso: Wire up getrandom() vDSO implementation on PPC32
powerpc/vdso: Wire up getrandom() vDSO implementation on PPC64
arch/powerpc/Kconfig | 1 +
arch/powerpc/include/asm/asm-compat.h | 8 +
arch/powerpc/include/asm/mman.h | 2 +-
arch/powerpc/include/asm/vdso/getrandom.h | 54 ++++
arch/powerpc/include/asm/vdso/vsyscall.h | 6 +
arch/powerpc/include/asm/vdso_datapage.h | 2 +
arch/powerpc/kernel/asm-offsets.c | 1 +
arch/powerpc/kernel/vdso/Makefile | 57 ++--
arch/powerpc/kernel/vdso/getrandom.S | 58 ++++
arch/powerpc/kernel/vdso/gettimeofday.S | 13 -
arch/powerpc/kernel/vdso/vdso32.lds.S | 1 +
arch/powerpc/kernel/vdso/vdso64.lds.S | 1 +
arch/powerpc/kernel/vdso/vgetrandom-chacha.S | 299 +++++++++++++++++++
arch/powerpc/kernel/vdso/vgetrandom.c | 14 +
fs/proc/task_mmu.c | 4 +-
include/linux/mm.h | 4 +-
include/trace/events/mmflags.h | 4 +-
tools/arch/powerpc/vdso | 1 +
tools/testing/selftests/vDSO/Makefile | 4 +
19 files changed, 492 insertions(+), 42 deletions(-)
create mode 100644 arch/powerpc/include/asm/vdso/getrandom.h
create mode 100644 arch/powerpc/kernel/vdso/getrandom.S
create mode 100644 arch/powerpc/kernel/vdso/vgetrandom-chacha.S
create mode 100644 arch/powerpc/kernel/vdso/vgetrandom.c
create mode 120000 tools/arch/powerpc/vdso
--
2.44.0
next reply other threads:[~2024-08-30 15:57 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-08-30 15:57 Christophe Leroy [this message]
2024-08-30 15:57 ` [PATCH v3 1/5] mm: Define VM_DROPPABLE for powerpc/32 Christophe Leroy
2024-09-01 11:17 ` Michael Ellerman
2024-08-30 15:57 ` [PATCH v3 2/5] powerpc/vdso32: Add crtsavres Christophe Leroy
2024-08-30 15:57 ` [PATCH v3 3/5] powerpc/vdso: Refactor CFLAGS for CVDSO build Christophe Leroy
2024-08-30 15:57 ` [PATCH v3 4/5] powerpc/vdso: Wire up getrandom() vDSO implementation on PPC32 Christophe Leroy
2024-08-30 16:14 ` Jason A. Donenfeld
2024-08-30 16:42 ` Christophe Leroy
2024-08-30 17:23 ` Christophe Leroy
2024-08-30 16:17 ` Jason A. Donenfeld
2024-08-30 18:52 ` Christophe Leroy
2024-08-30 15:57 ` [PATCH v3 5/5] powerpc/vdso: Wire up getrandom() vDSO implementation on PPC64 Christophe Leroy
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