From patchwork Wed Sep 18 14:02:28 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sergey Makarov X-Patchwork-Id: 13806917 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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 345F4CCD1AA for ; Wed, 18 Sep 2024 14:04:13 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sqvGw-0003HH-H7; Wed, 18 Sep 2024 10:03:10 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sqvGm-0002yP-0l; Wed, 18 Sep 2024 10:03:00 -0400 Received: from mta-04.yadro.com ([89.207.88.248]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sqvGk-0002b5-2B; Wed, 18 Sep 2024 10:02:59 -0400 DKIM-Filter: OpenDKIM Filter v2.11.0 mta-04.yadro.com 93970C0002 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=syntacore.com; s=mta-04; t=1726668175; bh=5W/qhfnBCdxvMNbbU8sTMOE6s1XNy+wv4Jmtt9p3OhQ=; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type:From; b=o2I9OWGlRPvWFrwoJ3l2U4shDBdhHvKfOBH6RJ6wCrYHR/qh4daX12QVEroJvZGg7 Rs/jL2Elhc79PKq+Du5E4u+DE3TrpYJZwLPUcJgAkIUb/tPGrbGpP1nNc3AcnJgm7S fh9DIdv0FUMXR36hu18aKrppq1zlQAHz/Mdc2kXNgkNbavrhcxNMeIE8Rpej+eZ6P1 bMjdbS6Teu1H6J64mAuVe1hMQS+pT6PeUXWreuyJyuhQd6Fl3at7rmNgoqYlGevdAb 23pyX3NJqcqw5nqQCuCLM8k/sVfYYCozos7H2hlr87G/g1lD2/+bSSp6D2zljTlQYZ EftoiFzZE71ww== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=syntacore.com; s=mta-03; t=1726668175; bh=5W/qhfnBCdxvMNbbU8sTMOE6s1XNy+wv4Jmtt9p3OhQ=; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type:From; b=iApSwrVc5Ue/6Wrw3SgaZFcsxNGeLBeRjNRUXoiwChujX90C1qPBpPCgJLedq5sd8 eFzMdO4nSi5ek94g6WUtHjWtcTSDnR9tueocZeq81OEEsQ+YG2j++OZ3CiwRnhV7JF ahFhS75A2OoCXtamZDD5ke3mI+mKqTo/jhy2WJEDlPq9ZSXc63FmszBVLNhr/BC7aC ob1FXcwi6DrzzO88RR+4hTu5BEljagMaOgNm5aFlLL2Q/k+yC25JxBVCYfHxJVcqk8 lQ2FRRPpDo4tBXhkj8Ux119gYyZfBWzlwhwPZ1rC8bzAPZ9X57/H+QWd7vhoNCKljN AZ5Dc2NuH6Sgg== From: Sergey Makarov To: CC: , , , , Subject: [PATCH 1/2] hw/intc: Make zeroth priority register read-only Date: Wed, 18 Sep 2024 17:02:28 +0300 Message-ID: <20240918140229.124329-2-s.makarov@syntacore.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240918140229.124329-1-s.makarov@syntacore.com> References: <20240918140229.124329-1-s.makarov@syntacore.com> MIME-Version: 1.0 X-ClientProxiedBy: T-Exch-05.corp.yadro.com (172.17.10.109) To T-EXCH-12.corp.yadro.com (172.17.11.143) Received-SPF: permerror client-ip=89.207.88.248; envelope-from=s.makarov@syntacore.com; helo=mta-04.yadro.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, T_SPF_PERMERROR=0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org According to PLIC specification chapter 4, zeroth priority register is reserved. Discard writes to this register. Signed-off-by: Sergey Makarov Reviewed-by: Alistair Francis --- hw/intc/sifive_plic.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/hw/intc/sifive_plic.c b/hw/intc/sifive_plic.c index e559f11805..3f3ee96ebc 100644 --- a/hw/intc/sifive_plic.c +++ b/hw/intc/sifive_plic.c @@ -189,8 +189,13 @@ static void sifive_plic_write(void *opaque, hwaddr addr, uint64_t value, if (addr_between(addr, plic->priority_base, plic->num_sources << 2)) { uint32_t irq = (addr - plic->priority_base) >> 2; - - if (((plic->num_priorities + 1) & plic->num_priorities) == 0) { + if (irq == 0) { + /* IRQ 0 source prioority is reserved */ + qemu_log_mask(LOG_GUEST_ERROR, + "%s: Invalid source priority write 0x%" + HWADDR_PRIx "\n", __func__, addr); + return; + } else if (((plic->num_priorities + 1) & plic->num_priorities) == 0) { /* * if "num_priorities + 1" is power-of-2, make each register bit of * interrupt priority WARL (Write-Any-Read-Legal). Just filter