From patchwork Thu Oct 10 07:01:08 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Thomas_Wei=C3=9Fschuh?= X-Patchwork-Id: 13829599 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (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 6CF0F1BBBC3; Thu, 10 Oct 2024 07:02:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728543727; cv=none; b=WtrnbCZYsK7yPCPL9wcWEDaBCga9FLEqdC7PhXY3CpHgMMs7Xc3RQnDpxAwtYd45tcXJ/7lS/NOQzFTfD1MLxZaLf9j5iFzbPY59q5z/YYprm2iJNutnAlhX+zgVwIlmSHA2s1aWkeiqLFj7JrnQ/hWSZkkymv3PZh+h/lDOuwE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728543727; c=relaxed/simple; bh=WIPUW1+5c4OWUexEOYHAu/zDSui+TD1Rmwt6KNpKs/A=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=SJeVf91SJf7o0LnIA0iNBwxCN92GJqYqdMFB56FA5EgBnl3IzN3fhuYrEjYl5oViCV6HrTZQlQDkpVyXz8L6rUFG8TpaUWEI8bDj0NWtqKcnl8bAI+nvEtgpwWpNMhLg5OBN7DgACeG1xd+wBwfJtnOiN0WT8lCZorDcG3qRqww= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=ndJGHPfL; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=MH2T81Ao; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="ndJGHPfL"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="MH2T81Ao" From: =?utf-8?q?Thomas_Wei=C3=9Fschuh?= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1728543723; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=KF1X3F6ARHGxF8oaxKdzOM4GysZzGmQKcnkswWuBTx0=; b=ndJGHPfLf2ExpAJ4MbxYj5J+P8wuFGPA7VYN9NrXrNAlUm/CGVxUrauYkG7TikMLhcJxcW iYwYdcNH5zfSrEBIy6lQMphOmnfJCE2iBKi76iPIHzw2lm67oIBLKMmGv4o6xsuENV3Myh ZMy30US0WZjW3qpAQMEbjjivpvqZ3CQcPPdqXQZq90KEIthe4wDpFw5ctRf6kBi/tz2cMk 1RzXAnqR9sZVO/JiMKcJ/Qtv0ZKmrNnOsqgOQMvHaNQaERMQ0LRmxDFNnlG1ehHvcq5RqB di01YHTH1z+vMFEWL+Gj0vn08Yfy+H+PsfKAjPiZtv6I/8MsShEMUFQVU7F7Fw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1728543723; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=KF1X3F6ARHGxF8oaxKdzOM4GysZzGmQKcnkswWuBTx0=; b=MH2T81AojO0jKuneSuCD3w8FdNX+OeGnOT9yCnWr3ROkgtmsAPXlTHrQQkIrlSnbh7IvlZ nzv+XX0BfnW2BKAQ== Date: Thu, 10 Oct 2024 09:01:08 +0200 Subject: [PATCH 06/28] riscv: vdso: Use only one single vvar mapping Precedence: bulk X-Mailing-List: linux-mips@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241010-vdso-generic-base-v1-6-b64f0842d512@linutronix.de> References: <20241010-vdso-generic-base-v1-0-b64f0842d512@linutronix.de> In-Reply-To: <20241010-vdso-generic-base-v1-0-b64f0842d512@linutronix.de> To: Guo Ren , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Catalin Marinas , Will Deacon , Paul Walmsley , Palmer Dabbelt , Albert Ou , Russell King , Huacai Chen , WANG Xuerui , Theodore Ts'o , "Jason A. Donenfeld" , Thomas Bogendoerfer , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Naveen N Rao , Madhavan Srinivasan , Vincenzo Frascino Cc: Christophe Leroy , linux-csky@vger.kernel.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-riscv@lists.infradead.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, =?utf-8?q?Thoma?= =?utf-8?q?s_Wei=C3=9Fschuh?= X-Developer-Signature: v=1; a=ed25519-sha256; t=1728543717; l=3820; i=thomas.weissschuh@linutronix.de; s=20240209; h=from:subject:message-id; bh=WIPUW1+5c4OWUexEOYHAu/zDSui+TD1Rmwt6KNpKs/A=; b=rP6ASr+p5qtSseOgybXaXYykoMDxYyz+tu1FXrx8Y3WZD4L2xbuIpAuT0PAHKcEkh9WZFigt/ RdDK+Gfq3LhADBTLK1iLgcDK80l4VS/omBd9TTZ4wW4ybQLNN2a7Sud X-Developer-Key: i=thomas.weissschuh@linutronix.de; a=ed25519; pk=pfvxvpFUDJV2h2nY0FidLUml22uGLSjByFbM6aqQQws= The vvar mapping is the same for all processes. Use a single mapping to simplify the logic and align it with the other architectures. In addition this will enable the move of the vvar handling into generic code. Signed-off-by: Thomas Weißschuh --- arch/riscv/kernel/vdso.c | 52 ++++++++++++++++-------------------------------- 1 file changed, 17 insertions(+), 35 deletions(-) diff --git a/arch/riscv/kernel/vdso.c b/arch/riscv/kernel/vdso.c index 98315b98256df412d48479c0114b5a5b49a7b583..3ca3ae4277e187e790a8bf513a9e80d8b6290bb2 100644 --- a/arch/riscv/kernel/vdso.c +++ b/arch/riscv/kernel/vdso.c @@ -23,11 +23,6 @@ enum vvar_pages { VVAR_NR_PAGES, }; -enum rv_vdso_map { - RV_VDSO_MAP_VVAR, - RV_VDSO_MAP_VDSO, -}; - #define VVAR_SIZE (VVAR_NR_PAGES << PAGE_SHIFT) static union vdso_data_store vdso_data_store __page_aligned_data; @@ -38,8 +33,6 @@ struct __vdso_info { const char *vdso_code_start; const char *vdso_code_end; unsigned long vdso_pages; - /* Data Mapping */ - struct vm_special_mapping *dm; /* Code Mapping */ struct vm_special_mapping *cm; }; @@ -92,6 +85,8 @@ struct vdso_data *arch_get_vdso_data(void *vvar_page) return (struct vdso_data *)(vvar_page); } +static const struct vm_special_mapping rv_vvar_map; + /* * The vvar mapping contains data for a specific time namespace, so when a task * changes namespace we must unmap its vvar data for the old namespace. @@ -108,12 +103,8 @@ int vdso_join_timens(struct task_struct *task, struct time_namespace *ns) mmap_read_lock(mm); for_each_vma(vmi, vma) { - if (vma_is_special_mapping(vma, vdso_info.dm)) - zap_vma_pages(vma); -#ifdef CONFIG_COMPAT - if (vma_is_special_mapping(vma, compat_vdso_info.dm)) + if (vma_is_special_mapping(vma, &rv_vvar_map)) zap_vma_pages(vma); -#endif } mmap_read_unlock(mm); @@ -155,43 +146,34 @@ static vm_fault_t vvar_fault(const struct vm_special_mapping *sm, return vmf_insert_pfn(vma, vmf->address, pfn); } -static struct vm_special_mapping rv_vdso_maps[] __ro_after_init = { - [RV_VDSO_MAP_VVAR] = { - .name = "[vvar]", - .fault = vvar_fault, - }, - [RV_VDSO_MAP_VDSO] = { - .name = "[vdso]", - .mremap = vdso_mremap, - }, +static const struct vm_special_mapping rv_vvar_map = { + .name = "[vvar]", + .fault = vvar_fault, +}; + +static struct vm_special_mapping rv_vdso_map __ro_after_init = { + .name = "[vdso]", + .mremap = vdso_mremap, }; static struct __vdso_info vdso_info __ro_after_init = { .name = "vdso", .vdso_code_start = vdso_start, .vdso_code_end = vdso_end, - .dm = &rv_vdso_maps[RV_VDSO_MAP_VVAR], - .cm = &rv_vdso_maps[RV_VDSO_MAP_VDSO], + .cm = &rv_vdso_map, }; #ifdef CONFIG_COMPAT -static struct vm_special_mapping rv_compat_vdso_maps[] __ro_after_init = { - [RV_VDSO_MAP_VVAR] = { - .name = "[vvar]", - .fault = vvar_fault, - }, - [RV_VDSO_MAP_VDSO] = { - .name = "[vdso]", - .mremap = vdso_mremap, - }, +static struct vm_special_mapping rv_compat_vdso_map __ro_after_init = { + .name = "[vdso]", + .mremap = vdso_mremap, }; static struct __vdso_info compat_vdso_info __ro_after_init = { .name = "compat_vdso", .vdso_code_start = compat_vdso_start, .vdso_code_end = compat_vdso_end, - .dm = &rv_compat_vdso_maps[RV_VDSO_MAP_VVAR], - .cm = &rv_compat_vdso_maps[RV_VDSO_MAP_VDSO], + .cm = &rv_compat_vdso_map, }; #endif @@ -227,7 +209,7 @@ static int __setup_additional_pages(struct mm_struct *mm, } ret = _install_special_mapping(mm, vdso_base, VVAR_SIZE, - (VM_READ | VM_MAYREAD | VM_PFNMAP), vdso_info->dm); + (VM_READ | VM_MAYREAD | VM_PFNMAP), &rv_vvar_map); if (IS_ERR(ret)) goto up_fail;