From patchwork Mon Sep 2 12:04:37 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christophe Leroy X-Patchwork-Id: 13787154 Received: from pegase2.c-s.fr (pegase2.c-s.fr [93.17.235.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A2320142651; Mon, 2 Sep 2024 12:04:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=93.17.235.10 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725278689; cv=none; b=VJHPIw+CL7hknvk8ian/x42QgGLbeXmkLAnPHoKIg1GHN53GPtp6UGCnWmM94K5ZH1Vqff7Pe9EPJsLwYMm4Bk6FIpfTJPoMmEG9v3oOIqwtpOAmw9XQLUh6oymhFdt5y4SpBss6pDzQR73l4GYWLt/yOnnv0RWOhI5yarhJ8pA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725278689; c=relaxed/simple; bh=6QJA22qLgaef3fSOvlKvx8xuZHLDNXZ+/mQjcDCzEMY=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=uVjXy6nOQxcaUrxvHUcnkLWCzaqARXY9ZtuljvhgKcNga/7glXGp7pvwclw3oXdM0+hywG3PN8Dh0ZB2psvjm98z29LK3x/XsKHmCDTy8Q8CdonaNIq3XUFFgajoci5k2p3NN9QX8VWEYfzvBMmtTDCCUgGPf7rrq3X2yLMhBos= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=csgroup.eu; spf=pass smtp.mailfrom=csgroup.eu; arc=none smtp.client-ip=93.17.235.10 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=csgroup.eu Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=csgroup.eu Received: from localhost (mailhub3.si.c-s.fr [172.26.127.67]) by localhost (Postfix) with ESMTP id 4Wy6rF4LfZz9sSN; Mon, 2 Sep 2024 14:04:45 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from pegase2.c-s.fr ([172.26.127.65]) by localhost (pegase2.c-s.fr [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id yk9NbO304bBT; Mon, 2 Sep 2024 14:04:45 +0200 (CEST) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase2.c-s.fr (Postfix) with ESMTP id 4Wy6rF35r3z9sS7; Mon, 2 Sep 2024 14:04:45 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 5422D8B76D; Mon, 2 Sep 2024 14:04:45 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id 52TK7Nj36tHo; Mon, 2 Sep 2024 14:04:45 +0200 (CEST) Received: from PO20335.idsi0.si.c-s.fr (unknown [192.168.234.167]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 524D28B763; Mon, 2 Sep 2024 14:04:44 +0200 (CEST) From: Christophe Leroy To: Andrew Morton , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Michael Ellerman , Nicholas Piggin , Naveen N Rao , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , Shuah Khan , "Jason A . Donenfeld" Cc: Christophe Leroy , 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 , Xi Ruoyao Subject: [PATCH v4 0/5] Wire up getrandom() vDSO implementation on powerpc Date: Mon, 2 Sep 2024 14:04:37 +0200 Message-ID: X-Mailer: git-send-email 2.44.0 Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1725278679; l=3360; i=christophe.leroy@csgroup.eu; s=20211009; h=from:subject:message-id; bh=6QJA22qLgaef3fSOvlKvx8xuZHLDNXZ+/mQjcDCzEMY=; b=rkRd0PJANyDxoARin8UZaDw85VDVM67JUNJRPKtg/l5osHwVfNdLo2rqVgI+mMAut8vXZ2bwB KXoGERc0HRoCjQSpBMuxuW9ZLqlOAtlY/8R4T+eTO3MO/rpoaIMyeN7 X-Developer-Key: i=christophe.leroy@csgroup.eu; a=ed25519; pk=HIzTzUj91asvincQGOFx6+ZF5AoUuP9GdOtQChs7Mm0= 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 Changes in v4: - Rebased on recent random git tree (963233ff0133) (The new tree includes selftests fixes) - Read/write counter in native byte order - Don't use anymore compat macros to write output - Fixed selftests build failure with patch 4 (without patch 5) on little endian on PPC64 - Implement a __kernel_getrandom() stub returning ENOSYS on ppc64 in patch 4 (without patch 5) to make selftests happy. 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/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 | 320 +++++++++++++++++++ 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/testing/selftests/vDSO/Makefile | 2 +- 17 files changed, 501 insertions(+), 43 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