From patchwork Sat Oct 18 11:56:56 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Zyngier X-Patchwork-Id: 5099731 Return-Path: X-Original-To: patchwork-kvm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 926739F38C for ; Sat, 18 Oct 2014 11:57:30 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id B55AC20176 for ; Sat, 18 Oct 2014 11:57:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id ECBC420165 for ; Sat, 18 Oct 2014 11:57:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751427AbaJRL5X (ORCPT ); Sat, 18 Oct 2014 07:57:23 -0400 Received: from inca-roads.misterjones.org ([213.251.177.50]:48693 "EHLO inca-roads.misterjones.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751172AbaJRL5P (ORCPT ); Sat, 18 Oct 2014 07:57:15 -0400 Received: from [90.219.10.17] (helo=zomby-woof.wild-wind.fr.eu.org) by cheepnis.misterjones.org with esmtpsa (TLSv1.2:AES128-SHA256:128) (Exim 4.80) (envelope-from ) id 1XfSdD-0005Fz-H9; Sat, 18 Oct 2014 13:57:11 +0200 From: Marc Zyngier To: Gleb Natapov , Paolo Bonzini Cc: kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, Christoffer Dall , Ard Biesheuvel Subject: [PATCH 06/12] ARM: kvm: define PAGE_S2_DEVICE as read-only by default Date: Sat, 18 Oct 2014 12:56:56 +0100 Message-Id: <1413633422-14907-7-git-send-email-marc.zyngier@arm.com> X-Mailer: git-send-email 2.1.1 In-Reply-To: <1413633422-14907-1-git-send-email-marc.zyngier@arm.com> References: <1413633422-14907-1-git-send-email-marc.zyngier@arm.com> X-SA-Exim-Connect-IP: 90.219.10.17 X-SA-Exim-Rcpt-To: gleb@kernel.org, pbonzini@redhat.com, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, christoffer.dall@linaro.org, ard.biesheuvel@linaro.org X-SA-Exim-Mail-From: marc.zyngier@arm.com X-SA-Exim-Scanned: No (on cheepnis.misterjones.org); SAEximRunCond expanded to false Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham 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: Ard Biesheuvel Now that we support read-only memslots, we need to make sure that pass-through device mappings are not mapped writable if the guest has requested them to be read-only. The existing implementation already honours this by calling kvm_set_s2pte_writable() on the new pte in case of writable mappings, so all we need to do is define the default pgprot_t value used for devices to be PTE_S2_RDONLY. Acked-by: Marc Zyngier Signed-off-by: Ard Biesheuvel Signed-off-by: Christoffer Dall --- arch/arm/include/asm/pgtable.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h index 01baef0..92b2fbe 100644 --- a/arch/arm/include/asm/pgtable.h +++ b/arch/arm/include/asm/pgtable.h @@ -100,7 +100,7 @@ extern pgprot_t pgprot_s2_device; #define PAGE_HYP _MOD_PROT(pgprot_kernel, L_PTE_HYP) #define PAGE_HYP_DEVICE _MOD_PROT(pgprot_hyp_device, L_PTE_HYP) #define PAGE_S2 _MOD_PROT(pgprot_s2, L_PTE_S2_RDONLY) -#define PAGE_S2_DEVICE _MOD_PROT(pgprot_s2_device, L_PTE_S2_RDWR) +#define PAGE_S2_DEVICE _MOD_PROT(pgprot_s2_device, L_PTE_S2_RDONLY) #define __PAGE_NONE __pgprot(_L_PTE_DEFAULT | L_PTE_RDONLY | L_PTE_XN | L_PTE_NONE) #define __PAGE_SHARED __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_XN)