From nobody Tue Feb 10 07:23:15 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; 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 1770061932471389.0457906492853; Mon, 2 Feb 2026 11:52:12 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vmzwn-0007jd-Q2; Mon, 02 Feb 2026 14:50:57 -0500 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 1vmzwJ-0005q1-1q; Mon, 02 Feb 2026 14:50:27 -0500 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 1vmzwH-0003rO-AE; Mon, 02 Feb 2026 14:50:26 -0500 Received: from tsrv.corpit.ru (tsrv.tls.msk.ru [192.168.177.2]) by isrv.corpit.ru (Postfix) with ESMTP id 4D9DA1850BC; Mon, 02 Feb 2026 22:46:06 +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 BA83835B29E; Mon, 02 Feb 2026 22:46:47 +0300 (MSK) From: Michael Tokarev To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org, Yao Zi , Bibo Mao , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Michael Tokarev Subject: [Stable-10.0.8 42/69] hw/loongarch/virt: Don't abort on access to unimplemented IOCSR Date: Mon, 2 Feb 2026 22:46:05 +0300 Message-ID: <20260202194638.939438-42-mjt@tls.msk.ru> X-Mailer: git-send-email 2.47.3 In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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: 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-ZM-MESSAGEID: 1770061934277154100 From: Yao Zi Since commit f2e61edb2946 ("hw/loongarch/virt: Use MemTxAttrs interface for misc ops") which adds a call to g_assert_not_reached() in the path of handling unimplemented IOCSRs, QEMU would abort when the guest accesses unimplemented IOCSRs. This is too serious since there's nothing fatal happening in QEMU itself, and the guest could probably continue running if we give zero as result for these reads, which also matches the behavior observed on 3A5000M real machine. Replace the assertion with qemu_log_mask(LOG_UNIMP, ...), it's still possible to examine unimplemented IOCSR access through "-d unimp" command line arguments. Fixes: f2e61edb2946 ("hw/loongarch/virt: Use MemTxAttrs interface for misc = ops") Signed-off-by: Yao Zi Signed-off-by: Bibo Mao Reviewed-by: Philippe Mathieu-Daud=C3=A9 Reviewed-by: Bibo Mao (cherry picked from commit 49ee001a5b8378e9a9b3db8cbf61e7eda970ecd2) (Mjt: trivial context fix for 10.0) Signed-off-by: Michael Tokarev diff --git a/hw/loongarch/virt.c b/hw/loongarch/virt.c index 65c9027feb..63771782de 100644 --- a/hw/loongarch/virt.c +++ b/hw/loongarch/virt.c @@ -45,6 +45,7 @@ #include "hw/block/flash.h" #include "hw/virtio/virtio-iommu.h" #include "qemu/error-report.h" +#include "qemu/log.h" =20 static void virt_get_veiointc(Object *obj, Visitor *v, const char *name, void *opaque, Error **errp) @@ -532,8 +533,15 @@ static MemTxResult virt_iocsr_misc_write(void *opaque,= hwaddr addr, EXTIOI_VIRT_BASE + EXTIOI_VIRT_CONFIG, features, attrs, NULL); break; + case VERSION_REG: + case FEATURE_REG: + case VENDOR_REG: + case CPUNAME_REG: + break; default: - g_assert_not_reached(); + qemu_log_mask(LOG_UNIMP, "%s: Unimplemented IOCSR 0x%" HWADDR_PRIx= "\n", + __func__, addr); + break; } =20 return MEMTX_OK; @@ -580,7 +588,9 @@ static MemTxResult virt_iocsr_misc_read(void *opaque, h= waddr addr, } break; default: - g_assert_not_reached(); + qemu_log_mask(LOG_UNIMP, "%s: Unimplemented IOCSR 0x%" HWADDR_PRIx= "\n", + __func__, addr); + break; } =20 *data =3D ret; --=20 2.47.3