From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5A20BC35DF8 for ; Tue, 25 Feb 2020 07:37:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 30D9221744 for ; Tue, 25 Feb 2020 07:37:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="K+Ml/upn" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729309AbgBYHhm (ORCPT ); Tue, 25 Feb 2020 02:37:42 -0500 Received: from mail-pl1-f196.google.com ([209.85.214.196]:36783 "EHLO mail-pl1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729189AbgBYHhl (ORCPT ); Tue, 25 Feb 2020 02:37:41 -0500 Received: by mail-pl1-f196.google.com with SMTP id a6so5142758plm.3 for ; Mon, 24 Feb 2020 23:37:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=fTm63vWBfzb1BdQ6B/CmE6SJCijkNB09UHlH94Y5uzA=; b=K+Ml/upn0oxvTo+3gRr3MfXbq8amghsNv5GktyPa1Bz9dIl4nWMHbaBhQYNQ6aszrz zm8G7MUyUXlzA1GvJ/5600wGmPeJXbjNXy/8mpDOuGJugnA7guDIbK8h/76jQQDmuUI8 i6hbT8QosV3VkssGwCBeHYXolDg6ws+D9G7fX2VcSSOa4ITxIhhs5mxnjXCiD3HrjS4s mzGmmR0k0trfs8P3tZhMTBXB2o/Z+A8BC1jt/KfCY8ATrXdkQaNTPAcxtY1ZkGmaUtKY mFqk7ByJPLfAelkxnmvMvKy6IUbUMWgCf0+YqNGTdve3w12izGIve8+fAIUrtppB8Xec audQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=fTm63vWBfzb1BdQ6B/CmE6SJCijkNB09UHlH94Y5uzA=; b=Gok2w5PyIduMi6RNt1BQQ2MKEAqzbr1tmqQCj9pnwQ3AN8fzlGlvvPN4rbboqoA+GF f3ZpUm2YH9WALbeRdjq3i3LJE15WYO2JsAORI4R9lUAqlaeI8z2bvbvlYxwiTrxYZo/I h2qfAUHjhXdj49XOh2bj7uIoAnAazQaOwBv8DqjgjXLVj9UjE+TWl1YRD1wTRvDgHSoz eR/X6GqTZKDS/dRwB8gZLo5GhhpAacpgpaQg5AytTP9jQ1qmySEUK/ooyWtfpX3YD0dO B8uYH03OU1WouLMdBrSu7xq/F3ErDtfUkTA0ofQ2ltt9+v4fW2nWlKiHkEjw9wVG9+iD MKoQ== X-Gm-Message-State: APjAAAX3SU+f3pfplNS91TikBSHRVBu2bA2r1qCWDm/hmwra6Ndm2UCy y/4m4S0kvWr4vEh1s2+I+i4= X-Google-Smtp-Source: APXvYqxqGvlZHIvXAmalhDezZDCnSGjb/EEDWYMB9RmGsUbBfPun/pC4HedAaHvGDMV4hAB9Smnhhw== X-Received: by 2002:a17:90a:a616:: with SMTP id c22mr3595342pjq.47.1582616260726; Mon, 24 Feb 2020 23:37:40 -0800 (PST) Received: from laptop.hsd1.wa.comcast.net ([2601:600:817f:a132:df3e:521d:99d5:710d]) by smtp.gmail.com with ESMTPSA id m128sm15979390pfm.183.2020.02.24.23.37.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 Feb 2020 23:37:40 -0800 (PST) From: Andrei Vagin To: Vincenzo Frascino Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Andrei Vagin , Thomas Gleixner , Dmitry Safonov Subject: [PATCH v2 1/6] arm64/vdso: use the fault callback to map vvar pages Date: Mon, 24 Feb 2020 23:37:26 -0800 Message-Id: <20200225073731.465270-2-avagin@gmail.com> X-Mailer: git-send-email 2.17.2 In-Reply-To: <20200225073731.465270-1-avagin@gmail.com> References: <20200225073731.465270-1-avagin@gmail.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is required to support time namespaces where a time namespace data page is different for each namespace. Signed-off-by: Andrei Vagin --- arch/arm64/kernel/vdso.c | 24 +++++++++++++++--------- 1 file changed, 15 insertions(+), 9 deletions(-) diff --git a/arch/arm64/kernel/vdso.c b/arch/arm64/kernel/vdso.c index 354b11e27c07..290c36d74e03 100644 --- a/arch/arm64/kernel/vdso.c +++ b/arch/arm64/kernel/vdso.c @@ -114,28 +114,32 @@ static int __vdso_init(enum arch_vdso_type arch_index) PAGE_SHIFT; /* Allocate the vDSO pagelist, plus a page for the data. */ - vdso_pagelist = kcalloc(vdso_lookup[arch_index].vdso_pages + 1, + vdso_pagelist = kcalloc(vdso_lookup[arch_index].vdso_pages, sizeof(struct page *), GFP_KERNEL); if (vdso_pagelist == NULL) return -ENOMEM; - /* Grab the vDSO data page. */ - vdso_pagelist[0] = phys_to_page(__pa_symbol(vdso_data)); - - /* Grab the vDSO code pages. */ pfn = sym_to_pfn(vdso_lookup[arch_index].vdso_code_start); for (i = 0; i < vdso_lookup[arch_index].vdso_pages; i++) - vdso_pagelist[i + 1] = pfn_to_page(pfn + i); + vdso_pagelist[i] = pfn_to_page(pfn + i); - vdso_lookup[arch_index].dm->pages = &vdso_pagelist[0]; - vdso_lookup[arch_index].cm->pages = &vdso_pagelist[1]; + vdso_lookup[arch_index].cm->pages = vdso_pagelist; return 0; } +static vm_fault_t vvar_fault(const struct vm_special_mapping *sm, + struct vm_area_struct *vma, struct vm_fault *vmf) +{ + if (vmf->pgoff == 0) + return vmf_insert_pfn(vma, vmf->address, + sym_to_pfn(vdso_data)); + return VM_FAULT_SIGBUS; +} + static int __setup_additional_pages(enum arch_vdso_type arch_index, struct mm_struct *mm, struct linux_binprm *bprm, @@ -155,7 +159,7 @@ static int __setup_additional_pages(enum arch_vdso_type arch_index, } ret = _install_special_mapping(mm, vdso_base, PAGE_SIZE, - VM_READ|VM_MAYREAD, + VM_READ|VM_MAYREAD|VM_PFNMAP, vdso_lookup[arch_index].dm); if (IS_ERR(ret)) goto up_fail; @@ -215,6 +219,7 @@ static struct vm_special_mapping aarch32_vdso_spec[C_PAGES] = { #ifdef CONFIG_COMPAT_VDSO { .name = "[vvar]", + .fault = vvar_fault, }, { .name = "[vdso]", @@ -396,6 +401,7 @@ static int vdso_mremap(const struct vm_special_mapping *sm, static struct vm_special_mapping vdso_spec[A_PAGES] __ro_after_init = { { .name = "[vvar]", + .fault = vvar_fault, }, { .name = "[vdso]", -- 2.24.1 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.7 required=3.0 tests=DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED,DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 28B73C35DF8 for ; Tue, 25 Feb 2020 07:38:11 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id EF6F724650 for ; Tue, 25 Feb 2020 07:38:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="a04AOFTr"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="K+Ml/upn" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EF6F724650 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=tK6QB2+Mq1ZiZq4UefgJfaDQgh0NS2lQ0NCjb9KTaT8=; b=a04AOFTrOKEudZHQbDYMaLGRt1 CTnY9xJPmz6J/vWqcdP2SwUGlxvjmzLjm+fS01qtKaR8hg52tNBXuHZQZALIayMj5CCDiCLC4PBWF ohGdOtV7HGKwZDus3vUYwPYue0tj4pDOrANmvpXQdYzzYEyjgglmsNSUpSY1/Ud5BFgVRjETpVqMH wuhV5tF4dpR8f6Jfjyp8EuBW39eHeTl25HK2BxMLl6fFMHC9iuncClAyOAuUfriu7SP9jImg6rgH5 efceuAEFRgm0nz8w9CFrlDpwDs8IdvIr23lX+zEP/r+RteIJzJabd0EmHi1glckpCZPHbpUvOZJVM UqoKuI6Q==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1j6Un5-0000M3-8c; Tue, 25 Feb 2020 07:38:03 +0000 Received: from mail-pl1-x643.google.com ([2607:f8b0:4864:20::643]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1j6Umj-00006G-NV for linux-arm-kernel@lists.infradead.org; Tue, 25 Feb 2020 07:37:43 +0000 Received: by mail-pl1-x643.google.com with SMTP id y8so5125287pll.13 for ; Mon, 24 Feb 2020 23:37:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=fTm63vWBfzb1BdQ6B/CmE6SJCijkNB09UHlH94Y5uzA=; b=K+Ml/upn0oxvTo+3gRr3MfXbq8amghsNv5GktyPa1Bz9dIl4nWMHbaBhQYNQ6aszrz zm8G7MUyUXlzA1GvJ/5600wGmPeJXbjNXy/8mpDOuGJugnA7guDIbK8h/76jQQDmuUI8 i6hbT8QosV3VkssGwCBeHYXolDg6ws+D9G7fX2VcSSOa4ITxIhhs5mxnjXCiD3HrjS4s mzGmmR0k0trfs8P3tZhMTBXB2o/Z+A8BC1jt/KfCY8ATrXdkQaNTPAcxtY1ZkGmaUtKY mFqk7ByJPLfAelkxnmvMvKy6IUbUMWgCf0+YqNGTdve3w12izGIve8+fAIUrtppB8Xec audQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=fTm63vWBfzb1BdQ6B/CmE6SJCijkNB09UHlH94Y5uzA=; b=LogcajBLYvtdLjPVRjdFz/8MJ9aacDkE85NAjuUNTNenoHcb4IR2k8DlgsO+Q/jIOR dJskh897FSXZphHIsXIo8dhjEDs5MF6gde7gZUqA5f9wBKgoHUjPBup0UHxDrrlT/v8G WkHkLLTAEi8+a6Dag9kJQy2MPLDZdrZFYr/rYBHMwEkYeEH1zaUVZaFIawYgxNbRrZcw WVXskjLs42oEGTEOfa/Q5fWhZVfA5lyc667Rm8Bf8MlgMI3WONq0fHQMyy2zrsl/Z69R S3Y1BtfeezXrR12TskhaaCdCSkVXMGJsDPGqfPQtRoHA9Jc9fbDgqw7udXIJx0mq2N88 PeGQ== X-Gm-Message-State: APjAAAVcYZ4oLAWM1mS4HOfYm4m+2CIR5FH7UZpHiyi30MNJYVehFB00 s7q4ZtVbnYfjFBgshzQXsyU= X-Google-Smtp-Source: APXvYqxqGvlZHIvXAmalhDezZDCnSGjb/EEDWYMB9RmGsUbBfPun/pC4HedAaHvGDMV4hAB9Smnhhw== X-Received: by 2002:a17:90a:a616:: with SMTP id c22mr3595342pjq.47.1582616260726; Mon, 24 Feb 2020 23:37:40 -0800 (PST) Received: from laptop.hsd1.wa.comcast.net ([2601:600:817f:a132:df3e:521d:99d5:710d]) by smtp.gmail.com with ESMTPSA id m128sm15979390pfm.183.2020.02.24.23.37.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 Feb 2020 23:37:40 -0800 (PST) From: Andrei Vagin To: Vincenzo Frascino Subject: [PATCH v2 1/6] arm64/vdso: use the fault callback to map vvar pages Date: Mon, 24 Feb 2020 23:37:26 -0800 Message-Id: <20200225073731.465270-2-avagin@gmail.com> X-Mailer: git-send-email 2.17.2 In-Reply-To: <20200225073731.465270-1-avagin@gmail.com> References: <20200225073731.465270-1-avagin@gmail.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200224_233741_768796_5C8D057E X-CRM114-Status: GOOD ( 14.40 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Thomas Gleixner , Andrei Vagin , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Dmitry Safonov MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org This is required to support time namespaces where a time namespace data page is different for each namespace. Signed-off-by: Andrei Vagin --- arch/arm64/kernel/vdso.c | 24 +++++++++++++++--------- 1 file changed, 15 insertions(+), 9 deletions(-) diff --git a/arch/arm64/kernel/vdso.c b/arch/arm64/kernel/vdso.c index 354b11e27c07..290c36d74e03 100644 --- a/arch/arm64/kernel/vdso.c +++ b/arch/arm64/kernel/vdso.c @@ -114,28 +114,32 @@ static int __vdso_init(enum arch_vdso_type arch_index) PAGE_SHIFT; /* Allocate the vDSO pagelist, plus a page for the data. */ - vdso_pagelist = kcalloc(vdso_lookup[arch_index].vdso_pages + 1, + vdso_pagelist = kcalloc(vdso_lookup[arch_index].vdso_pages, sizeof(struct page *), GFP_KERNEL); if (vdso_pagelist == NULL) return -ENOMEM; - /* Grab the vDSO data page. */ - vdso_pagelist[0] = phys_to_page(__pa_symbol(vdso_data)); - - /* Grab the vDSO code pages. */ pfn = sym_to_pfn(vdso_lookup[arch_index].vdso_code_start); for (i = 0; i < vdso_lookup[arch_index].vdso_pages; i++) - vdso_pagelist[i + 1] = pfn_to_page(pfn + i); + vdso_pagelist[i] = pfn_to_page(pfn + i); - vdso_lookup[arch_index].dm->pages = &vdso_pagelist[0]; - vdso_lookup[arch_index].cm->pages = &vdso_pagelist[1]; + vdso_lookup[arch_index].cm->pages = vdso_pagelist; return 0; } +static vm_fault_t vvar_fault(const struct vm_special_mapping *sm, + struct vm_area_struct *vma, struct vm_fault *vmf) +{ + if (vmf->pgoff == 0) + return vmf_insert_pfn(vma, vmf->address, + sym_to_pfn(vdso_data)); + return VM_FAULT_SIGBUS; +} + static int __setup_additional_pages(enum arch_vdso_type arch_index, struct mm_struct *mm, struct linux_binprm *bprm, @@ -155,7 +159,7 @@ static int __setup_additional_pages(enum arch_vdso_type arch_index, } ret = _install_special_mapping(mm, vdso_base, PAGE_SIZE, - VM_READ|VM_MAYREAD, + VM_READ|VM_MAYREAD|VM_PFNMAP, vdso_lookup[arch_index].dm); if (IS_ERR(ret)) goto up_fail; @@ -215,6 +219,7 @@ static struct vm_special_mapping aarch32_vdso_spec[C_PAGES] = { #ifdef CONFIG_COMPAT_VDSO { .name = "[vvar]", + .fault = vvar_fault, }, { .name = "[vdso]", @@ -396,6 +401,7 @@ static int vdso_mremap(const struct vm_special_mapping *sm, static struct vm_special_mapping vdso_spec[A_PAGES] __ro_after_init = { { .name = "[vvar]", + .fault = vvar_fault, }, { .name = "[vdso]", -- 2.24.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel