From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f42.google.com (mail-ot1-f42.google.com [209.85.210.42]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7A89C28E23 for ; Tue, 5 Mar 2024 03:05:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.42 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709607922; cv=none; b=TCFpoob7YRiJJevvId5RvOsPIbisZjRD0g1hAYMtIblIMCfo0cp/hkiPwSR3rjfeXAQfT/BckC+yOc/97HcEki/BszeDT5yq/IOHb2hCN1GoC8EZkhTmDACE08lJgw8H067+1ZAL7n2ixSVsw42cq4VbLOW8GUNNO9DSEdmMveg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709607922; c=relaxed/simple; bh=5ZVjSwAfJsPd+QkXMr9nZIk7lyTzPslSdY9PUohFIoU=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=gdEX69+vjjEbCPN2LbIF+wUMDdVtNBc26K4To/nP6hkw51dK5htSEDW9zqHN8maed2yLl/HHlgxqeL6Ilyj5tBUD6XLUFeTMybbb4pxfBYcNgP0J2lAKWpIDUvTHSurr/6ysyc2CMx5sJFsmLIo4xo9oVDYgxP8P2n64dadCZzY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=Vy5Si5xR; arc=none smtp.client-ip=209.85.210.42 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Vy5Si5xR" Received: by mail-ot1-f42.google.com with SMTP id 46e09a7af769-6e4b34f2455so2856399a34.2 for ; Mon, 04 Mar 2024 19:05:21 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1709607920; x=1710212720; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=GO37OSQRQXlN2VGFyW6LzwjH/NpS/PSzwjkGcO70oKE=; b=Vy5Si5xRsbpFzCRuiXEp+ZJv2EceCxMmgm268nuwJpgFlaukFeKkwTr6/H9QMJ6mdV aaD1YgQ3SqgXaIRMLnc1ao0yjb0gORz0ufl1gtVKV0oqur+cSijtKBU3yCJYRGX+aBKz L9u74BhtHhe2fZxJDLYOYrQsNS07ryUY5ei8RBjDkRTK5vhNdujl0xiP0uRd03wK5UuF ne2QIC19/wkrwpDTapVu+whRm8EzmZs/sMzwq7fAjs4MePM0CFAmyEbVxE3xUjnjYMyW XDpaeIxiKiJppTDOUftNVUmFEwNYDOzSb7nnVKHFHR1GDTKPutuaqfFkV9jhsOw8u/PW sV5g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1709607920; x=1710212720; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=GO37OSQRQXlN2VGFyW6LzwjH/NpS/PSzwjkGcO70oKE=; b=u6L6NAyk2sHdhL763KdtFGZFSraNsqYsWRF+ravJWS87vTDkXBwB1RPMLMpXboEKUq +b9blWTcdcAy63FsbZt4F+VWlapI1cAQsD5Mvd1D5XEP2qig5TSbqNqH9ACfVlkNAY/Y NfbEaRzKHc6cAqFqfe5CD+twJat7EGlSiiOddDoWppM7uCWL/jQrE6F9utZoD2+MFuCp iyuBsudugMCP/impK+AQzW7WbWKBm20IvuN/MU2PulK1sL82AwqVzMyeh9e44jFfpgHi Rgy+q/vRBfp+PoVKpgiajcgcy/4jiT6t/UgnutrIdGOaU+mdvVDR+BKOd9Gdn8yRrNng GZwQ== X-Gm-Message-State: AOJu0YxGB+awaFC/LNj2gZjQhhXGjFsSqFBeWy9npjMB9huEETQ73D5E 4O+ppWYsQA313N/fRW6y71uHhnA/8m3N+SP+OFoKDAf+neiF7iqG4r3NImjv X-Google-Smtp-Source: AGHT+IF4DC0r95WIbRC/5og05/9WKTnTnsPpk3e37OmDlc5CQCogzBPB5agJQ7Ifv5VhRu3af2p6Pw== X-Received: by 2002:a05:6870:898f:b0:220:99bf:c26d with SMTP id f15-20020a056870898f00b0022099bfc26dmr589777oaq.9.1709607919882; Mon, 04 Mar 2024 19:05:19 -0800 (PST) Received: from localhost.localdomain ([2620:10d:c090:400::5:9426]) by smtp.gmail.com with ESMTPSA id y15-20020aa7854f000000b006e5a99942c6sm6822695pfn.88.2024.03.04.19.05.18 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Mon, 04 Mar 2024 19:05:19 -0800 (PST) From: Alexei Starovoitov To: bpf@vger.kernel.org Cc: daniel@iogearbox.net, andrii@kernel.org, torvalds@linux-foundation.org, brho@google.com, hannes@cmpxchg.org, lstoakes@gmail.com, akpm@linux-foundation.org, urezki@gmail.com, hch@infradead.org, rppt@kernel.org, boris.ostrovsky@oracle.com, sstabellini@kernel.org, jgross@suse.com, linux-mm@kvack.org, xen-devel@lists.xenproject.org, kernel-team@fb.com Subject: [PATCH v4 bpf-next 0/2] mm: Enforce ioremap address space and introduce sparse vm_area Date: Mon, 4 Mar 2024 19:05:14 -0800 Message-Id: <20240305030516.41519-1-alexei.starovoitov@gmail.com> X-Mailer: git-send-email 2.39.3 (Apple Git-145) Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Alexei Starovoitov v3 -> v4 - dropped VM_XEN patch for now. It will be in the follow up. - fixed constant as pointed out by Mike v2 -> v3 - added Christoph's reviewed-by to patch 1 - cap commit log lines to 75 chars - factored out common checks in patch 3 into helper - made vm_area_unmap_pages() return void There are various users of kernel virtual address space: vmalloc, vmap, ioremap, xen. - vmalloc use case dominates the usage. Such vm areas have VM_ALLOC flag and these areas are treated differently by KASAN. - the areas created by vmap() function should be tagged with VM_MAP (as majority of the users do). - ioremap areas are tagged with VM_IOREMAP and vm area start is aligned to size of the area unlike vmalloc/vmap. - there is also xen usage that is marked as VM_IOREMAP, but it doesn't call ioremap_page_range() unlike all other VM_IOREMAP users. To clean this up a bit, enforce that ioremap_page_range() checks the range and VM_IOREMAP flag. In addition BPF would like to reserve regions of kernel virtual address space and populate it lazily, similar to xen use cases. For that reason, introduce VM_SPARSE flag and vm_area_[un]map_pages() helpers to populate this sparse area. In the end the /proc/vmallocinfo will show "vmalloc" "vmap" "ioremap" "sparse" categories for different kinds of address regions. ioremap, sparse will return zero when dumped through /proc/kcore Alexei Starovoitov (2): mm: Enforce VM_IOREMAP flag and range in ioremap_page_range. mm: Introduce VM_SPARSE kind and vm_area_[un]map_pages(). include/linux/vmalloc.h | 5 +++ mm/vmalloc.c | 72 +++++++++++++++++++++++++++++++++++++++-- 2 files changed, 75 insertions(+), 2 deletions(-) -- 2.43.0