From mboxrd@z Thu Jan 1 00:00:00 1970 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 9D43BCA0EED for ; Wed, 20 Aug 2025 09:44:16 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1uofLt-0007nN-9h; Wed, 20 Aug 2025 05:43:29 -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 1uofLq-0007mL-28 for qemu-devel@nongnu.org; Wed, 20 Aug 2025 05:43:26 -0400 Received: from mgamail.intel.com ([198.175.65.9]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1uofLn-0003Yy-4O for qemu-devel@nongnu.org; Wed, 20 Aug 2025 05:43:25 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1755683003; x=1787219003; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=qbfLSEb5FUUQ6c3gyDdGEr7Q6EBZVrcThkqOwEyKN6U=; b=M49slmzDF2ff21ajqKA44fcXziXl/BdpW5TNHJPr/DsEGSNby/93EqbJ w5PmeQdijumwmTEZ5RF/AhzXXj0CpApdVuYVPCCne/nhU5rqHEMmd1G0G s7LSiLM5fYg3gfn708MKezyEsm9MAGSGh9XJIqdAiD820PsHWDaY2Efb2 anwxEYJuWieuAPaCejrr17IHk9L/UUYVxlcy9ZQbesfq7qyL/DIgtaxOR yHyBoCuxoXqVRR8iZuFebsKBpmelWxEqH4TJuZMl+L+xAI8ivHZR+oJLQ gfyPEJ0gLjO1KLNedDFCi5wuWW2/uEnvfhKQguh02W5U3xReNAhTkk6Ap w==; X-CSE-ConnectionGUID: aLfN5bIJSVq3aWxDgVXYrg== X-CSE-MsgGUID: rK7eojAWR5W4+XBQJq8A6Q== X-IronPort-AV: E=McAfee;i="6800,10657,11527"; a="80538353" X-IronPort-AV: E=Sophos;i="6.17,302,1747724400"; d="scan'208";a="80538353" Received: from fmviesa002.fm.intel.com ([10.60.135.142]) by orvoesa101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Aug 2025 02:43:18 -0700 X-CSE-ConnectionGUID: nQrmfFvhQ8i1OfEs0NMjnw== X-CSE-MsgGUID: yG9eNSCdRLK6BPZV29L8JA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.17,302,1747724400"; d="scan'208";a="191774253" Received: from liuzhao-optiplex-7080.sh.intel.com (HELO localhost) ([10.239.160.39]) by fmviesa002.fm.intel.com with ESMTP; 20 Aug 2025 02:43:16 -0700 Date: Wed, 20 Aug 2025 18:05:00 +0800 From: Zhao Liu To: Wang Xin Cc: qemu-devel@nongnu.org, pbonzini@redhat.com, weidong.huang@huawei.com, Tuo Xie Subject: Re: [PATCH] target/i386: Add support save/load exception error_code Message-ID: References: <20250819145834.3998-1-wangxinxin.wang@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250819145834.3998-1-wangxinxin.wang@huawei.com> Received-SPF: pass client-ip=198.175.65.9; envelope-from=zhao1.liu@intel.com; helo=mgamail.intel.com X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_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: 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 On Tue, Aug 19, 2025 at 10:58:34PM +0800, Wang Xin wrote: > Date: Tue, 19 Aug 2025 22:58:34 +0800 > From: Wang Xin > Subject: [PATCH] target/i386: Add support save/load exception error_code > X-Mailer: git-send-email 2.50.1.windows.1 > > From: WangXin > > For now, qemu save/load CPU exception info(such as exception_nr and > has_error_code), while the exception error_code is ignored. This will > cause the dest hypervisor reinject a vCPU exception with error_code(0), > potentially causing a guest kernel panic. > > For instance, if src VM stopped with an user-mode write #PF (error_code 6), > the dest hypervisor will reinject an #PF with error_code(0) when vCPU resume, > then guest kernel panic as: > BUG: unable to handle page fault for address: 00007f80319cb010 > #PF: supervisor read access in user mode > #PF: error_code(0x0000) - not-present page > RIP: 0033:0x40115d > > To fix it, support save/load exception error_code. > > Signed-off-by: Xin Wang > Signed-off-by: Tuo Xie Reviewed-by: Zhao Liu