From nobody Sun May 12 20:43:55 2024 Delivered-To: importer@patchew.org Received-SPF: temperror (zoho.com: Error in retrieving data from DNS) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=temperror (zoho.com: Error in retrieving data from DNS) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org ARC-Seal: i=1; a=rsa-sha256; t=1558097828; cv=none; d=zoho.com; s=zohoarc; b=jUZC1g1N3PgU69LVY5ZKM0ms7tFEqBiNroZ25x+tSyxBvawdZ19/UCAxAk4MGfiijAuqNYqLF7v9NGI51/fqNnxg/GiznIxwNbMoVrRqW6mH7vnhRPgb5zA/xiPa7OL1GN0inZt3EswRiiATAIKRno2o2uYyi0yejipGqnyjzcQ= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1558097828; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:Sender:Subject:To:ARC-Authentication-Results; bh=NaUnci8B9HBDi/ooNkPbky4WsnWJZJwzLzaaEKJDwao=; b=gIWNM3zprdkoin37EK202SXJwvqKFyPf7IvuQFkwHS8KcWEKDL4OwJLFKlUOR86eTikLEMucyly1Fo03TeQbWlJIwVm0QYpF4u6LBhMMSrPgvLF4MrOT5nZtozxRgpZMrICIZVDLpnMxTUuIgusajgmNy/eeUh1X+c+tVyPIi/Q= ARC-Authentication-Results: i=1; mx.zoho.com; spf=temperror (zoho.com: Error in retrieving data from DNS) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (209.51.188.17 [209.51.188.17]) by mx.zohomail.com with SMTPS id 1558097828151538.9590772481417; Fri, 17 May 2019 05:57:08 -0700 (PDT) Received: from localhost ([127.0.0.1]:48224 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hRcPp-0008FK-PR for importer@patchew.org; Fri, 17 May 2019 08:56:49 -0400 Received: from eggs.gnu.org ([209.51.188.92]:51927) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hRcP2-0007hG-DJ for qemu-devel@nongnu.org; Fri, 17 May 2019 08:56:01 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hRcP0-00081v-GY for qemu-devel@nongnu.org; Fri, 17 May 2019 08:55:59 -0400 Received: from 89-24-57-155.nat.epc.tmcz.cz ([89.24.57.155]:28926 helo=gorgo) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hRcOy-0007h8-GZ for qemu-devel@nongnu.org; Fri, 17 May 2019 08:55:57 -0400 Received: from gorgo (localhost.localdomain [127.0.0.1]) by gorgo (8.15.2/8.15.2) with ESMTPS id x4HCarGY868599 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT); Fri, 17 May 2019 14:36:53 +0200 Received: (from jermar@localhost) by gorgo (8.15.2/8.15.2/Submit) id x4HCapHV868540; Fri, 17 May 2019 14:36:51 +0200 From: =?UTF-8?q?Jakub=20Jerm=C3=A1=C5=99?= To: qemu-devel@nongnu.org Date: Fri, 17 May 2019 14:35:33 +0200 Message-Id: <20190517123533.868479-1-jakub.jermar@kernkonzept.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by gorgo id x4HCarGY868599 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 89.24.57.155 Subject: [Qemu-devel] [PATCH v3] mips: Decide to map PAGE_EXEC in map_address X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?UTF-8?q?Jakub=20Jerm=C3=A1=C5=99?= , Aleksandar Rikalo , Aleksandar Markovic , Aurelien Jarno Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" This commit addresses QEMU Bug #1825311: mips_cpu_handle_mmu_fault renders all accessed pages executable It allows finer-grained control over whether the accessed page should be executable by moving the decision to the underlying map_address function, which has more information for this. As a result, pages that have the XI bit set in the TLB and are accessed for read/write, don't suddenly end up being executable. Signed-off-by: Jakub Jerm=C3=A1=C5=99 --- Changes since v2: =20 This is the same patch as v2, but rebased to current master. target/mips/helper.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/target/mips/helper.c b/target/mips/helper.c index 9799f2ede1..68e44df4da 100644 --- a/target/mips/helper.c +++ b/target/mips/helper.c @@ -43,7 +43,7 @@ int no_mmu_map_address (CPUMIPSState *env, hwaddr *physic= al, int *prot, target_ulong address, int rw, int access_type) { *physical =3D address; - *prot =3D PAGE_READ | PAGE_WRITE; + *prot =3D PAGE_READ | PAGE_WRITE | PAGE_EXEC; return TLBRET_MATCH; } =20 @@ -61,7 +61,7 @@ int fixed_mmu_map_address (CPUMIPSState *env, hwaddr *phy= sical, int *prot, else *physical =3D address; =20 - *prot =3D PAGE_READ | PAGE_WRITE; + *prot =3D PAGE_READ | PAGE_WRITE | PAGE_EXEC; return TLBRET_MATCH; } =20 @@ -101,6 +101,9 @@ int r4k_map_address (CPUMIPSState *env, hwaddr *physica= l, int *prot, *prot =3D PAGE_READ; if (n ? tlb->D1 : tlb->D0) *prot |=3D PAGE_WRITE; + if (!(n ? tlb->XI1 : tlb->XI0)) { + *prot |=3D PAGE_EXEC; + } return TLBRET_MATCH; } return TLBRET_DIRTY; @@ -182,7 +185,7 @@ static int get_seg_physical_address(CPUMIPSState *env, = hwaddr *physical, } else { /* The segment is unmapped */ *physical =3D physical_base | (real_address & segmask); - *prot =3D PAGE_READ | PAGE_WRITE; + *prot =3D PAGE_READ | PAGE_WRITE | PAGE_EXEC; return TLBRET_MATCH; } } @@ -907,7 +910,7 @@ bool mips_cpu_tlb_fill(CPUState *cs, vaddr address, int= size, } if (ret =3D=3D TLBRET_MATCH) { tlb_set_page(cs, address & TARGET_PAGE_MASK, - physical & TARGET_PAGE_MASK, prot | PAGE_EXEC, + physical & TARGET_PAGE_MASK, prot, mmu_idx, TARGET_PAGE_SIZE); return true; } @@ -927,7 +930,7 @@ bool mips_cpu_tlb_fill(CPUState *cs, vaddr address, int= size, access_type, mips_access_type, mmu_= idx); if (ret =3D=3D TLBRET_MATCH) { tlb_set_page(cs, address & TARGET_PAGE_MASK, - physical & TARGET_PAGE_MASK, prot | PAGE_EXEC, + physical & TARGET_PAGE_MASK, prot, mmu_idx, TARGET_PAGE_SIZE); return true; } --=20 2.20.1