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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id A6CC7C27C53 for ; Wed, 12 Jun 2024 13:48:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-Type: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=2zUirtCZ/cdwbbd8Dv3VvUvuOonejBGJ+V456KzLKDg=; b=T2xrtY6vT17+6OKOZ/ypck3Vcu 6bljBMYLArd65r1DDFOCngR/c0hAD5N3VkzlWArHu3swN6sOyRbR3uvBDL7kEni/dYolcL9BKfmjf 2jLE8JTXnQULduWAv9H6mru5BED+tr02gfppDE4KnbgchLcrADwirXd2bG0qLhVHzgYWJpwEkcTEw FrfISV6XSnltbgp+6XVh+d5BARpMNQofpeXWLolfo9915CnADLSHu9KWKg9EK6Y5KhfXLVG+YEy+f Axv8TGpinQek1WKFklgb+pF07H0O37gHcsRu4nJ1zCTIb4+b6wSyVUYtup1co7WzRMq2O3b3bhvdg MVqsP3eQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sHOKz-0000000CnTZ-2seK; Wed, 12 Jun 2024 13:48:29 +0000 Received: from s3.sipsolutions.net ([2a01:4f8:242:246e::2] helo=sipsolutions.net) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sHOKw-0000000CnRa-3laS for linux-um@lists.infradead.org; Wed, 12 Jun 2024 13:48:28 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sipsolutions.net; s=mail; h=Content-Transfer-Encoding:MIME-Version: Message-ID:Date:Subject:Cc:To:From:Content-Type:Sender:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-To:Resent-Cc: Resent-Message-ID:In-Reply-To:References; bh=2zUirtCZ/cdwbbd8Dv3VvUvuOonejBGJ+V456KzLKDg=; t=1718200104; x=1719409704; b=LKU0eID+G1eIJXQYXtAboDp0LZHm4nxl0zFNm71yHvzSCLxOlVNoUJuRiHOOZKW8g7PuK85Ow97 H35cwksRk0s2oUvMe/BGaRDkL802Vn8cMFQpwzu8lq1YOnQBfAqOW9xHzSE8rv7vpZWNRimjFavLu NPFnFEqmGyv1cpqSH4fv0Z0API8JEVikpRsXQ4NQlfoiSO/e+BpponxU9KxtImfpNh72nTK1CzENO bM6w4HCfapraH9STt3lTTDzhn2Pg40QOJWVabREeV5Kz8kDV3NB90/P3zVjenetOU1yVbhqeWBIoV KXga8DySHNTLUbjZfRk96qtFvNt6PpbAQK9A==; Received: by sipsolutions.net with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.97) (envelope-from ) id 1sHOKr-0000000ALhN-1Fqd; Wed, 12 Jun 2024 15:48:21 +0200 From: benjamin@sipsolutions.net To: linux-um@lists.infradead.org Cc: Benjamin Berg Subject: [PATCH v2 0/5] Increased address space for 64 bit Date: Wed, 12 Jun 2024 15:47:59 +0200 Message-ID: <20240612134804.1626427-1-benjamin@sipsolutions.net> X-Mailer: git-send-email 2.45.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240612_064826_967064_D1F4E585 X-CRM114-Status: UNSURE ( 7.92 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-um@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-um" Errors-To: linux-um-bounces+linux-um=archiver.kernel.org@lists.infradead.org From: Benjamin Berg This patchset fixes a few bugs, adds a new method of discovering the host task size and finally adds four level page table support. All of this means the userspace TASK_SIZE is much larger and in turns permits userspace applications that need a lot of virtual addresses to work fine. One such application is ASAN which uses a fixed address in memory that would otherwise not be addressable. v2: * Improved double clone logic using CLONE_VFORK * Kconfig fixes pointed out by Tiwei Bie Benjamin Berg (5): um: Fix stub_start address calculation um: Limit TASK_SIZE to the addressable range um: Do a double clone to disable rseq um: Discover host_task_size from envp um: Add 4 level page table support arch/um/Kconfig | 1 + arch/um/include/asm/page.h | 14 +++- arch/um/include/asm/pgalloc.h | 11 ++- arch/um/include/asm/pgtable-4level.h | 119 +++++++++++++++++++++++++++ arch/um/include/asm/pgtable.h | 6 +- arch/um/include/shared/as-layout.h | 2 +- arch/um/include/shared/os.h | 2 +- arch/um/kernel/mem.c | 17 +++- arch/um/kernel/um_arch.c | 14 +++- arch/um/os-Linux/main.c | 9 +- arch/um/os-Linux/skas/process.c | 55 +++++++++++-- arch/x86/um/Kconfig | 38 ++++++--- arch/x86/um/os-Linux/task_size.c | 19 ++++- 13 files changed, 274 insertions(+), 33 deletions(-) create mode 100644 arch/um/include/asm/pgtable-4level.h -- 2.45.1