From patchwork Wed Jul 3 08:40:22 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Palmer Dabbelt X-Patchwork-Id: 11029131 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5845714F6 for ; Wed, 3 Jul 2019 08:51:58 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4AB81285DA for ; Wed, 3 Jul 2019 08:51:58 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3F54728974; Wed, 3 Jul 2019 08:51:58 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id D39C0285DA for ; Wed, 3 Jul 2019 08:51:57 +0000 (UTC) Received: from localhost ([::1]:33760 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hiazc-0008Eo-Vx for patchwork-qemu-devel@patchwork.kernel.org; Wed, 03 Jul 2019 04:51:56 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:51194) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hiapO-0005VG-EV for qemu-devel@nongnu.org; Wed, 03 Jul 2019 04:41:23 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hiapN-0006RR-7G for qemu-devel@nongnu.org; Wed, 03 Jul 2019 04:41:22 -0400 Received: from mail-lj1-f195.google.com ([209.85.208.195]:41336) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1hiapN-0006OY-0I for qemu-devel@nongnu.org; Wed, 03 Jul 2019 04:41:21 -0400 Received: by mail-lj1-f195.google.com with SMTP id 205so1463273ljj.8 for ; Wed, 03 Jul 2019 01:41:20 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding:cc:from:to; bh=D1HIL5SBmBBlqGmn3DV7OFXg5gWo+HXWOwuA3mR3IqE=; b=cN6JMn51bPmd/Sce5ZvLBqCoZJ99hCb9NTSrikMtbhf4vM98uQUIt+38NY2TTvMWOw sC4qHh/nMrFsY93gJOPG+Aa5BKF1Py/ErVGCJGx9IluNQiIvn4CRnevKNe9YtjcFuvlK U68c1ng/JcPXZEATzutJHAgWwM/d9cG8l/vWUIe3pAHsKYnociZMdvYqHNfqjpFQoCi+ C+e1ymr2AZGnIYMuIU3d5mhrdVeJIBVBPfW01mCpuGg1zaxqq0OzUbIepl17gjgnrv5G KmyiRZNcqRWtp+ZXbqsj2LkYKpovA5dT1ykP03hgm7kikVfjiTFB1x19v+f8EXYnJJgE +tXg== X-Gm-Message-State: APjAAAVjZoShpiMvxvAZ1CMEUK369bejTsHaf9P7uLvrsnc/son/hOLG 059IEYUFE/GvyZjSCInSF9NSu02wmGdNcQ== X-Google-Smtp-Source: APXvYqz0YCnSubA2q7ypKkeNwCDmJ+Mkruj38luMs43GLY2i3z0f/gK5u7QH7lWAxLU7KEPaK5dyYw== X-Received: by 2002:a2e:9158:: with SMTP id q24mr2478639ljg.119.1562143279251; Wed, 03 Jul 2019 01:41:19 -0700 (PDT) Received: from localhost ([134.17.27.127]) by smtp.gmail.com with ESMTPSA id p12sm343296lja.23.2019.07.03.01.41.18 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Wed, 03 Jul 2019 01:41:18 -0700 (PDT) Date: Wed, 3 Jul 2019 01:40:22 -0700 Message-Id: <20190703084048.6980-7-palmer@sifive.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190703084048.6980-1-palmer@sifive.com> References: <20190703084048.6980-1-palmer@sifive.com> MIME-Version: 1.0 From: Palmer Dabbelt To: Peter Maydell X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.85.208.195 Subject: [Qemu-devel] [PULL 06/32] RISC-V: Raise access fault exceptions on PMP violations X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Alistair Francis , Palmer Dabbelt , qemu-riscv@nongnu.org, qemu-devel@nongnu.org, Hesham Almatary Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP From: Hesham Almatary Section 3.6 in RISC-V v1.10 privilege specification states that PMP violations report "access exceptions." The current PMP implementation has a bug which wrongly reports "page exceptions" on PMP violations. This patch fixes this bug by reporting the correct PMP access exceptions trap values. Signed-off-by: Hesham Almatary Reviewed-by: Alistair Francis Signed-off-by: Palmer Dabbelt --- target/riscv/cpu_helper.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c index a45b05ef8395..ffbfaf433268 100644 --- a/target/riscv/cpu_helper.c +++ b/target/riscv/cpu_helper.c @@ -337,12 +337,13 @@ restart: } static void raise_mmu_exception(CPURISCVState *env, target_ulong address, - MMUAccessType access_type) + MMUAccessType access_type, bool pmp_violation) { CPUState *cs = env_cpu(env); int page_fault_exceptions = (env->priv_ver >= PRIV_VERSION_1_10_0) && - get_field(env->satp, SATP_MODE) != VM_1_10_MBARE; + get_field(env->satp, SATP_MODE) != VM_1_10_MBARE && + !pmp_violation; switch (access_type) { case MMU_INST_FETCH: cs->exception_index = page_fault_exceptions ? @@ -424,6 +425,7 @@ bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size, CPURISCVState *env = &cpu->env; hwaddr pa = 0; int prot; + bool pmp_violation = false; int ret = TRANSLATE_FAIL; qemu_log_mask(CPU_LOG_MMU, "%s ad %" VADDR_PRIx " rw %d mmu_idx %d\n", @@ -438,6 +440,7 @@ bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size, if (riscv_feature(env, RISCV_FEATURE_PMP) && (ret == TRANSLATE_SUCCESS) && !pmp_hart_has_privs(env, pa, TARGET_PAGE_SIZE, 1 << access_type)) { + pmp_violation = true; ret = TRANSLATE_FAIL; } if (ret == TRANSLATE_SUCCESS) { @@ -447,7 +450,7 @@ bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size, } else if (probe) { return false; } else { - raise_mmu_exception(env, address, access_type); + raise_mmu_exception(env, address, access_type, pmp_violation); riscv_raise_exception(env, cs->exception_index, retaddr); } #else