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 9119DC27C53 for ; Wed, 12 Jun 2024 16:41:41 +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=VW+hTKLl5MYcXVci3T2M23aPUtMM1ahLNDMmxu8Cir8=; b=cF7HR+VkWAJEAMQPuhGzP15A4X +8H1uPbexg4QvwZiC+4MYqzeJ7D8PLCcFbofqNALrizwvc0m2W63oVJk2fwtw54Pr7/+OKaCOfV+L RzAnco/E1wHOj0f24YFCh2mIqeYFp/rMWdiq4c6jYXIC4Mu8pHw7CxjgNJGyeBqrV9Hu+SZGATFmi +UUiujxgWUUFOzlunuPP+sgx37cO/mV5BuQ5n/2tR+AZwmek9y7Wh2vMUTloaKlBeVUR6rLXZ0d7R bSOUaBhzp/Vttn04WK+My8msUcBRWIxy2SzCmGjJR+j9SJioKYypWUbUxL/KvcgDpVxpLJLULuC6P Ew4e5O3Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sHR2b-0000000DPtG-0njN; Wed, 12 Jun 2024 16:41:41 +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 1sHR2X-0000000DPrl-0VSy for linux-um@lists.infradead.org; Wed, 12 Jun 2024 16:41:40 +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=VW+hTKLl5MYcXVci3T2M23aPUtMM1ahLNDMmxu8Cir8=; t=1718210496; x=1719420096; b=N8wEDzfiW5LnjVcqIdPNZ7qsCkJWwbeLQIR5Qqi/rsycW03bXsnK3H/Zp4WNd7XaAfJc7Xt8DuD C++SLpLwll1NEjvV40TLd2hqVtUGCKFX1APoISdgZn2/tjbXRr0Oh6F2KjAV9iw3AjXh1GEKtKTnY j++0MUeX+8fQN74nT8txAZG4JTDhaeY1Ps269zp0u2UGO7yM3BBfdBBTD3lxw8nGtOcSgFv77zctO BtOm6qYrMy0ynq+pVhrvKwvxtEauCdajz7yZ2W8TJkCvMzgJiGBaO0ak/UgPmujnrU5l/Wzrb33+H UM2knmWjAUHOg0025MLob6cM8QtyJsiuFuYA==; Received: by sipsolutions.net with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.97) (envelope-from ) id 1sHR2T-0000000AUQy-1pNR; Wed, 12 Jun 2024 18:41:34 +0200 From: benjamin@sipsolutions.net To: linux-um@lists.infradead.org Cc: Benjamin Berg Subject: [PATCH v4 0/5] Increased address space for 64 bit Date: Wed, 12 Jun 2024 18:41:03 +0200 Message-ID: <20240612164108.1742106-1-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_094137_409711_98AB3E33 X-CRM114-Status: UNSURE ( 9.78 ) 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 Sorry for the noise, but I noticed that v3 has an issue on some host kernels, so I changed the waitpid back to how it was before CLONE_VFORK. 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 v3: * Undo incorrect change in child wait loop v4: * Do not use WNOHANG in wait for CLONE_VFORK 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 | 53 +++++++++++- arch/x86/um/Kconfig | 38 ++++++--- arch/x86/um/os-Linux/task_size.c | 19 ++++- 13 files changed, 273 insertions(+), 32 deletions(-) create mode 100644 arch/um/include/asm/pgtable-4level.h -- 2.45.1