From patchwork Thu Aug 13 11:34:04 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Suzuki K Poulose X-Patchwork-Id: 7008021 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 66CB5C05AC for ; Thu, 13 Aug 2015 11:40:22 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 89C182075A for ; Thu, 13 Aug 2015 11:40:21 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A99CF20747 for ; Thu, 13 Aug 2015 11:40:20 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZPqq0-0002Rn-UJ; Thu, 13 Aug 2015 11:38:24 +0000 Received: from eu-smtp-delivery-143.mimecast.com ([207.82.80.143]) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZPqp3-0001bJ-Mw for linux-arm-kernel@lists.infradead.org; Thu, 13 Aug 2015 11:37:31 +0000 Received: from cam-owa1.Emea.Arm.com (fw-tnat.cambridge.arm.com [217.140.96.140]) by eu-smtp-1.mimecast.com with ESMTP id uk-mta-19-cAPFxVDxRa6rZNU60-EfwQ-11; Thu, 13 Aug 2015 12:34:37 +0100 Received: from e106634-lin.cambridge.arm.com ([10.1.2.79]) by cam-owa1.Emea.Arm.com with Microsoft SMTPSVC(6.0.3790.3959); Thu, 13 Aug 2015 12:34:34 +0100 From: "Suzuki K. Poulose" To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 14/14] arm64: 36 bit VA Date: Thu, 13 Aug 2015 12:34:04 +0100 Message-Id: <1439465645-22584-15-git-send-email-suzuki.poulose@arm.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1439465645-22584-1-git-send-email-suzuki.poulose@arm.com> References: <1439465645-22584-1-git-send-email-suzuki.poulose@arm.com> X-OriginalArrivalTime: 13 Aug 2015 11:34:34.0851 (UTC) FILETIME=[07671B30:01D0D5BC] X-MC-Unique: cAPFxVDxRa6rZNU60-EfwQ-11 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150813_043726_361764_C49F7860 X-CRM114-Status: UNSURE ( 6.79 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -4.2 (----) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, kvm@vger.kernel.org, "Suzuki K. Poulose" , marc.zyngier@arm.com, catalin.marinas@arm.com, will.deacon@arm.com, linux-kernel@vger.kernel.org, kvmarm@lists.cs.columbia.edu MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: "Suzuki K. Poulose" 36bit VA lets us use 2 level page tables while limiting the available address space to 64GB. Cc: Mark Rutland Cc: Catalin Marinas Cc: Will Deacon Signed-off-by: Suzuki K. Poulose --- arch/arm64/Kconfig | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 8327edf..0407fd3 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -164,6 +164,7 @@ config FIX_EARLYCON_MEM config PGTABLE_LEVELS int + default 2 if ARM64_16K_PAGES && ARM64_VA_BITS_36 default 2 if ARM64_64K_PAGES && ARM64_VA_BITS_42 default 3 if ARM64_64K_PAGES && ARM64_VA_BITS_48 default 3 if ARM64_4K_PAGES && ARM64_VA_BITS_39 @@ -472,6 +473,10 @@ choice space sizes. The level of translation table is determined by a combination of page size and virtual address space size. +config ARM64_VA_BITS_36 + bool "36-bit" + depends on ARM64_16K_PAGES + config ARM64_VA_BITS_39 bool "39-bit" depends on ARM64_4K_PAGES @@ -491,6 +496,7 @@ endchoice config ARM64_VA_BITS int + default 36 if ARM64_VA_BITS_36 default 39 if ARM64_VA_BITS_39 default 42 if ARM64_VA_BITS_42 default 47 if ARM64_VA_BITS_47 @@ -564,7 +570,7 @@ config ARCH_WANT_GENERAL_HUGETLB def_bool y config ARCH_WANT_HUGE_PMD_SHARE - def_bool y if ARM64_4K_PAGES || ARM64_16K_PAGES + def_bool y if ARM64_4K_PAGES || (ARM64_16K_PAGES && !ARM64_VA_BITS_36) config HAVE_ARCH_TRANSPARENT_HUGEPAGE def_bool y