From patchwork Thu Sep 5 21:15:51 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Charlie Jenkins X-Patchwork-Id: 13792997 Received: from mail-ot1-f50.google.com (mail-ot1-f50.google.com [209.85.210.50]) (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 B8B821AD270 for ; Thu, 5 Sep 2024 21:16:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.50 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725570979; cv=none; b=fbJ0G67+1qg5ZsxKp0NehDYIw506y7WZCImSSD7Fzm5n7R+XrxytGat9lYLbjv/8ckOkPyCd6doya9njVDjgkt2FsCK8wknvogXtTMWlviRLPj2T0a4Y3VLbsWPjJWWV/AbwGu/3YI6Nn92y4e1Fd5UF+sH8HZ9VK10YpmX2NrM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725570979; c=relaxed/simple; bh=B2nFsYQPUa93R6MPC6rybC4BjlmBU89eB/xyA3tmSh8=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=g5radifZ3GCHd3OtjYyva6Mld2ZQVf9AAuqDgBENgd2GX52zJ5VVmj3dkkJblY43AdhvyWbE04JGxVRimdCTrCov8Re333aSsIblyB/Civwgm0n/2o61jNQB18T7S0xQpsvHgZ2Hhy1RX+ez/jvsGBePb7uwUEYnadMCDAf+IG8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rivosinc.com; spf=pass smtp.mailfrom=rivosinc.com; dkim=pass (2048-bit key) header.d=rivosinc-com.20230601.gappssmtp.com header.i=@rivosinc-com.20230601.gappssmtp.com header.b=kwcr2M9f; arc=none smtp.client-ip=209.85.210.50 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rivosinc.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rivosinc.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=rivosinc-com.20230601.gappssmtp.com header.i=@rivosinc-com.20230601.gappssmtp.com header.b="kwcr2M9f" Received: by mail-ot1-f50.google.com with SMTP id 46e09a7af769-70f6a1afc90so649476a34.3 for ; Thu, 05 Sep 2024 14:16:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20230601.gappssmtp.com; s=20230601; t=1725570976; x=1726175776; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=f6U8xmtXOad/vlvI1PiwvXKTTO0WQVhDEUoOSf42FlI=; b=kwcr2M9fgdzlMxXxsayGgr8FB6aw0Hi/w/Uub2U9/gvoItEWYuyY00uL0iGEYsHR8u GzpH2W1Y0Y2/r+kq3e9N6mPxLqJtCzVp/9rZ7rAp0ocRPdMczBj28zwKzjl2rWU4m67b jmZ+JQekCPFbAZ1rVbsGYXW/KjoT/cKjW4pzzx7MIIOHc/8glsj90n6oEYjU6urKpv5E O4naPYEPOcl/gYnCb1sgjdE8U/+p+E0zc1PyQ8jy4No90yl17lLSAEjG9wEDgS3Ep3lm FTwQAH/NzfHnZsddyTCCeepeaY7xQVFJEYI/bDJewzysQOQOkwxvxmz0hPncK+ZHtceZ ahnQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1725570976; x=1726175776; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=f6U8xmtXOad/vlvI1PiwvXKTTO0WQVhDEUoOSf42FlI=; b=S84035To1v9r/skw1K+SHHlhUuE/ya4h61g01rBb41XMq+0OXa1nxOpH3wpMznYxyz 2+ffFqYmdfvQyvCwP2MG3q4yR1ALMIgQBnPKNJQ2+pgWP43wKDuanWSoV9327MOEPJq/ 7vZzJ4XnShQhPBWaSHTeS4/A+4EbSzgWDVGvzIqjziobI30DAcbGU2sZT6uW3pOCyl3q NHQVkI9zq1OM/+IVpfZAby3EFP7EVpXYi6RDlGchHnz0GUF/rJoWsMx/fJI2IWVqYlWI L+UmrMY8Kvs0Aiyeq3RxYq4AIRF4RwBP4VrcYP1Kexddm5ePMw1Lq0cZ7JphpPsFWgY4 NwQw== X-Forwarded-Encrypted: i=1; AJvYcCW3rsp2+Fz+IUlykHrMeuM/8qntE+8DcfSnSrAXszlqHDI1mzI7OxoVi1QC52tsuLhr5fXWY6SX6tUG@vger.kernel.org X-Gm-Message-State: AOJu0YxYpvrz/tW2PlXYYXIwP8hjG53kAX8mOY2IqLPXgFQ8MaE5xGcJ PcZBKtKHh16KY+Aw5H56PNAb0r6WRznLLMBDAw8VcqT3X2+ZvVXxo+C3FO4MgSs= X-Google-Smtp-Source: AGHT+IHmMPDz3EnCCj73XeYdf9AhtZ+Ct4KejhsVi5dvIA4rh768bjpktZjdCxUayXeGPhLE3R+w8Q== X-Received: by 2002:a05:6358:4287:b0:1b5:be34:9ad5 with SMTP id e5c5f4694b2df-1b83866e08bmr73366455d.15.1725570975653; Thu, 05 Sep 2024 14:16:15 -0700 (PDT) Received: from charlie.ba.rivosinc.com ([64.71.180.162]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-7d4fbda7abesm3775746a12.61.2024.09.05.14.16.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Sep 2024 14:16:14 -0700 (PDT) From: Charlie Jenkins Date: Thu, 05 Sep 2024 14:15:51 -0700 Subject: [PATCH RFC v3 1/2] mm: Add personality flag to limit address to 47 bits Precedence: bulk X-Mailing-List: linux-mips@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240905-patches-below_hint_mmap-v3-1-3cd5564efbbb@rivosinc.com> References: <20240905-patches-below_hint_mmap-v3-0-3cd5564efbbb@rivosinc.com> In-Reply-To: <20240905-patches-below_hint_mmap-v3-0-3cd5564efbbb@rivosinc.com> To: Arnd Bergmann , Richard Henderson , Ivan Kokshaysky , Matt Turner , Vineet Gupta , Russell King , Guo Ren , Huacai Chen , WANG Xuerui , Thomas Bogendoerfer , "James E.J. Bottomley" , Helge Deller , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Naveen N Rao , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Sven Schnelle , Yoshinori Sato , Rich Felker , John Paul Adrian Glaubitz , "David S. Miller" , Andreas Larsson , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Andy Lutomirski , Peter Zijlstra , Muchun Song , Andrew Morton , "Liam R. Howlett" , Vlastimil Babka , Lorenzo Stoakes , Shuah Khan , Christoph Hellwig , Michal Hocko , "Kirill A. Shutemov" , Chris Torek Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-abi-devel@lists.sourceforge.net, Charlie Jenkins X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1348; i=charlie@rivosinc.com; h=from:subject:message-id; bh=B2nFsYQPUa93R6MPC6rybC4BjlmBU89eB/xyA3tmSh8=; b=owGbwMvMwCHWx5hUnlvL8Y3xtFoSQ9ot+em/OZQnfrnX8ed38Mt7a5qeTLghH2JpoLVOM/lWE E9Dee3VjlIWBjEOBlkxRRaeaw3MrXf0y46Klk2AmcPKBDKEgYtTACbS9pyRoX//nRvvVlydp7Xm 8/1ihzrxA51eb31tEvRWPpi166jgtMMM/2Pui4Sr/NDPPh503bbDcC77kZANfKUH/kz3LrfLiU2 exg4A X-Developer-Key: i=charlie@rivosinc.com; a=openpgp; fpr=7D834FF11B1D8387E61C776FFB10D1F27D6B1354 Create a personality flag ADDR_LIMIT_47BIT to support applications that wish to transition from running in environments that support at most 47-bit VAs to environments that support larger VAs. This personality can be set to cause all allocations to be below the 47-bit boundary. Using MAP_FIXED with mmap() will bypass this restriction. Signed-off-by: Charlie Jenkins --- include/uapi/linux/personality.h | 1 + mm/mmap.c | 3 +++ 2 files changed, 4 insertions(+) diff --git a/include/uapi/linux/personality.h b/include/uapi/linux/personality.h index 49796b7756af..cd3b8c154d9b 100644 --- a/include/uapi/linux/personality.h +++ b/include/uapi/linux/personality.h @@ -22,6 +22,7 @@ enum { WHOLE_SECONDS = 0x2000000, STICKY_TIMEOUTS = 0x4000000, ADDR_LIMIT_3GB = 0x8000000, + ADDR_LIMIT_47BIT = 0x10000000, }; /* diff --git a/mm/mmap.c b/mm/mmap.c index d0dfc85b209b..a5c7544853e5 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1766,6 +1766,9 @@ unsigned long vm_unmapped_area(struct vm_unmapped_area_info *info) { unsigned long addr; + if (current->personality & ADDR_LIMIT_47BIT) + info->high_limit = MIN(info->high_limit, BIT(47) - 1); + if (info->flags & VM_UNMAPPED_AREA_TOPDOWN) addr = unmapped_area_topdown(info); else