From nobody Tue Apr 7 21:27:34 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org ARC-Seal: i=1; a=rsa-sha256; t=1773258054; cv=none; d=zohomail.com; s=zohoarc; b=QBkSuEL82tObhw4nI4f5FqxK3fdn+bzvuS/P0HVI5X+bzaau4fcuerip7msxvTIY9L1HvgYmQs3nqV5EuwdSeLqVD6WScBXenz9VvsIsTLR2ouq73iL1pyEQDCNHPr88qt6ttsqlEj+CVIkXWLXYrvwElWh/mWLBsBGt+CcEHQ4= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1773258054; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=+rZvulqkWjbqKbiT13/6BH5NVrF+wwuH3/ty7G75788=; b=Imi4mZxXHYCZfG2wKaPPjtnzCeZKNWlu/A0gzOmKcQMkWr8UVRsHkaHqW3PfPdXElhfbNpGg3gCm/CCrO6XUikW69An9ANRJURAgqfvGrzvDeKg0+GOPaFxWIuswqXYX6JCdM2nAzFcsCRrID2Y13cIv/wdNDlw1vCEk74/vCh0= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1773258054027330.75126209140797; Wed, 11 Mar 2026 12:40:54 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1w0PPI-00029u-0u; Wed, 11 Mar 2026 15:39:48 -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 1w0PPG-000295-VH; Wed, 11 Mar 2026 15:39:46 -0400 Received: from isrv.corpit.ru ([212.248.84.144]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1w0PPF-0000m5-Cv; Wed, 11 Mar 2026 15:39:46 -0400 Received: from tsrv.corpit.ru (tsrv.tls.msk.ru [192.168.177.2]) by isrv.corpit.ru (Postfix) with ESMTP id 8442219211B; Wed, 11 Mar 2026 22:34:30 +0300 (MSK) Received: from think4mjt.tls.msk.ru (mjtthink.wg.tls.msk.ru [192.168.177.146]) by tsrv.corpit.ru (Postfix) with ESMTP id 922F437C480; Wed, 11 Mar 2026 22:35:08 +0300 (MSK) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=tls.msk.ru; s=202602; t=1773257670; bh=Oj8BN/M4HEAm0OcI5+WySxkFpddjnuNaWZfoCR5+BJ4=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Nxjcvl6ANAJ4fCGNJdGhXqgDMckLm14lgcYxbU6HQJ+MLI8aLr/UDQ2c+lvEk8siz APmqgO8fS2JwxmGAKU3ST8vV7E+gPqIr18trmxU8uoPPWVHJsdUKZBgA3qrGE6dob3 94J48jeOD7XXKyVdVV+w9wlks6hJuOUJHasUn2AaCVulODb1QmWcdQQRONi1rhDRvU u9GbXxkGGROpWGH5Cnhe2xH20ovTAA7v7Iervgw3hQfC4YsFSHdBYgg2/XYFY0c01a wVuRLqti2VH7zPPLDxknt2Cy/EcAp07Ip8PslhdZPuzZeEimfj5ExerciJ8b12Dny3 05DOCNTF23rPA== From: Michael Tokarev To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org, rail5 , Bibo Mao , Song Gao , Michael Tokarev Subject: [Stable-10.2.2 51/53] target/loongarch: Avoid recursive PNX exception on CSR_BADI fetch Date: Wed, 11 Mar 2026 22:34:44 +0300 Message-ID: <20260311193449.1096110-51-mjt@tls.msk.ru> X-Mailer: git-send-email 2.47.3 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=212.248.84.144; envelope-from=mjt@tls.msk.ru; helo=isrv.corpit.ru X-Spam_score_int: -2 X-Spam_score: -0.3 X-Spam_bar: / X-Spam_report: (-0.3 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.819, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.903, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @tls.msk.ru) X-ZM-MESSAGEID: 1773258056733154100 Content-Type: text/plain; charset="utf-8" From: rail5 loongarch_cpu_do_interrupt() updates CSR_BADI by fetching the faulting instruction with cpu_ldl_code_mmu(). For a PNX exception (instruction fetch prohibited by NX), fetching the instruction at env->pc will fault with PNX again. This can lead to an infinite exception loop. Treat PNX like other instruction-fetch exceptions (PIF/ADEF) and do not update CSR_BADI for it. Fixes: 410dfbf620a ("target/loongarch: Move TCG specified functions to tcg_= cpu.c") Cc: qemu-stable@nongnu.org Signed-off-by: rail5 (Andrew S. Rightenburg) Reviewed-by: Bibo Mao Reviewed-by: Song Gao Signed-off-by: Song Gao (cherry picked from commit db2325f79481fab87211e5a287580d753f582cb8) Signed-off-by: Michael Tokarev diff --git a/target/loongarch/tcg/tcg_cpu.c b/target/loongarch/tcg/tcg_cpu.c index 8615e03d14..e777139712 100644 --- a/target/loongarch/tcg/tcg_cpu.c +++ b/target/loongarch/tcg/tcg_cpu.c @@ -109,6 +109,7 @@ static void loongarch_cpu_do_interrupt(CPUState *cs) } QEMU_FALLTHROUGH; case EXCCODE_PIF: + case EXCCODE_PNX: case EXCCODE_ADEF: cause =3D cs->exception_index; update_badinstr =3D 0; @@ -129,7 +130,6 @@ static void loongarch_cpu_do_interrupt(CPUState *cs) case EXCCODE_PIS: case EXCCODE_PME: case EXCCODE_PNR: - case EXCCODE_PNX: case EXCCODE_PPI: cause =3D cs->exception_index; break; --=20 2.47.3