From patchwork Tue Aug 29 04:24:05 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Wen, Qian" X-Patchwork-Id: 1827077 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256 header.s=Intel header.b=jUSUx9/m; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=patchwork.ozlabs.org) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4RZYwJ0wZ1z1yfy for ; Tue, 29 Aug 2023 14:14:22 +1000 (AEST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qaq6f-0007Yf-0e; Tue, 29 Aug 2023 00:13:33 -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 1qaq6c-0007Xm-Rq for qemu-devel@nongnu.org; Tue, 29 Aug 2023 00:13:30 -0400 Received: from mgamail.intel.com ([134.134.136.31]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qaq6a-0005xf-83 for qemu-devel@nongnu.org; Tue, 29 Aug 2023 00:13:30 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1693282408; x=1724818408; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=trRHMCaxL8HH/RDBMQuNGezTx8m3gpA8aj+8rjtgPAs=; b=jUSUx9/m9R//WKJPcu7e5ijekD0KxUVoy4/mk61sJnPvuzbgEXL8k9Lk PGggi3x/Jgj5rOWvOFHY5wcCvoa0f5mGJmesiT3RNURFq/xgb0MAD6FhZ EnpbIF5suA/BlzKpcE09sqDd84upIzUinoqy6faRgyqq2XjbqmrUZpXPY /ClQbceBdFXKdFPJQBGv0AJSWfjZVnh3RWJpU4IM+c5/P4C/lfv4JLU+1 J3kmifK5QIY4QUfEaGEkZ+PeuFoiC5LT9UV5tFGlUUNJZealnBazf8XwW 7Aw1FPoelruX4pW7Lj6t5weRFn5ZIcrS7Ej0UIKs2it8+77/ESSrHOnfg w==; X-IronPort-AV: E=McAfee;i="6600,9927,10816"; a="439220486" X-IronPort-AV: E=Sophos;i="6.02,208,1688454000"; d="scan'208";a="439220486" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Aug 2023 21:13:25 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10816"; a="862087986" X-IronPort-AV: E=Sophos;i="6.02,208,1688454000"; d="scan'208";a="862087986" Received: from pc.sh.intel.com ([10.238.200.75]) by orsmga004.jf.intel.com with ESMTP; 28 Aug 2023 21:13:23 -0700 From: Qian Wen To: qemu-devel@nongnu.org Cc: xiaoyao.li@intel.com, zhao1.liu@intel.com, pbonzini@redhat.com, richard.henderson@linaro.org, babu.moger@amd.com, Qian Wen , Isaku Yamahata Subject: [PATCH v4 2/2] target/i386: Avoid overflow of the cache parameter enumerated by leaf 4 Date: Tue, 29 Aug 2023 12:24:05 +0800 Message-Id: <20230829042405.932523-3-qian.wen@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230829042405.932523-1-qian.wen@intel.com> References: <20230829042405.932523-1-qian.wen@intel.com> MIME-Version: 1.0 Received-SPF: pass client-ip=134.134.136.31; envelope-from=qian.wen@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, 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+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org According to SDM, CPUID.0x4:EAX[31:26] indicates the Maximum number of addressable IDs for processor cores in the physical package. If we launch over 64 cores VM, the 6-bit field will overflow, and the wrong core_id number will be reported. Since the HW reports 0x3f when the intel processor has over 64 cores, limit the max value written to EBX[31:26] to 63, so max num_cores should be 64. Signed-off-by: Qian Wen Reviewed-by: Zhao Liu Reviewed-by: Xiaoyao Li Reviewed-by: Isaku Yamahata --- target/i386/cpu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index fc0437bdb1..90fe0a6a46 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -248,7 +248,7 @@ static void encode_cache_cpuid4(CPUCacheInfo *cache, *eax = CACHE_TYPE(cache->type) | CACHE_LEVEL(cache->level) | (cache->self_init ? CACHE_SELF_INIT_LEVEL : 0) | - ((num_cores - 1) << 26) | + ((MIN(num_cores, 64) - 1) << 26) | ((num_apic_ids - 1) << 14); assert(cache->line_size > 0);