From nobody Mon Feb 9 14:50:40 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass header.i=@intel.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; dmarc=pass(p=none dis=none) header.from=linux.intel.com ARC-Seal: i=1; a=rsa-sha256; t=1676280954; cv=none; d=zohomail.com; s=zohoarc; b=I/U6VUyCH3GalN8P6k3OIGrdNBbb0SLm20rgl0BHJsByiAJkNb1u09n4ou6kBE+sdScGjeuwSlkJl0i0GLuqtkwpNGFToaj/433hXKFxo9oQMDEGjLs+haUa6hloDKyXVHXCZ4jx65qyVIXEPrQ9AlnJlgvTnOu0hZNdJX1x+UQ= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1676280954; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=eLIJBDEoAIcExtC7DmZrDfseFTerznrUy+IkmfnMFHA=; b=T2mgx4OPJVcUJ5dVKhcVoLf7cf7YVpjn4jFBRl/lPok0kX/FjxcfQz3QDMVfVsUEOfjnh8YIioK6sHjU4t0chDdzg0gk75iqyjRSMx60GtIkq+qVHgqH5ZFAD2jxc3mYdkzUhANll3rV6xF8yUg7jxKef0oQzZm95H3UtrJgJK0= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass header.i=@intel.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; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1676280954709786.3930286375979; Mon, 13 Feb 2023 01:35:54 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pRVBI-0007h8-Go; Mon, 13 Feb 2023 04:31:28 -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 1pRVAA-0006mD-8X for qemu-devel@nongnu.org; Mon, 13 Feb 2023 04:30:21 -0500 Received: from mga02.intel.com ([134.134.136.20]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pRVA0-0006ms-Sv for qemu-devel@nongnu.org; Mon, 13 Feb 2023 04:30:16 -0500 Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Feb 2023 01:30:06 -0800 Received: from liuzhao-optiplex-7080.sh.intel.com ([10.239.160.112]) by orsmga004.jf.intel.com with ESMTP; 13 Feb 2023 01:30:00 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1676280608; x=1707816608; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=Cy4+98KPu3JM0FYdIqdy+k8SAFPj3EZM5g5RLHeoHLc=; b=ca3chaQElRUCuXy9kKSWIojixmed8AyzHlyaxHbUUeWQUEgVGPQTF5d0 oWFhKAzNvThy+rVYXtn51M86nomkOhuWt8G6APN/yV0CAj46lWgoIxpW6 jMO3DcjarYk9smRY53xARaE2bzTH4X+d4JXJIMTaw8V53s8Vj3I9jolPJ HwDMr+TWlB79dk5Odbqt61j1rWVvS8S5hii6mCI5vSIuCAcQDzGN4l42i IljcrW71TxPUT4Qz7yeKbtJn3iuYzMLz0rucgDq86CNXitNSsr/s970Ls OB19k+1PFBp6GY1mDm8sP11zUnHBORW/mVkmMQ/934zWS0Zc2Tcu2qldy w==; X-IronPort-AV: E=McAfee;i="6500,9779,10619"; a="318875848" X-IronPort-AV: E=Sophos;i="5.97,293,1669104000"; d="scan'208";a="318875848" X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10619"; a="792660439" X-IronPort-AV: E=Sophos;i="5.97,293,1669104000"; d="scan'208";a="792660439" From: Zhao Liu To: Eduardo Habkost , Marcel Apfelbaum , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Yanan Wang , "Michael S . Tsirkin" , Richard Henderson , Paolo Bonzini , Eric Blake , Markus Armbruster Cc: qemu-devel@nongnu.org, Zhenyu Wang , Dapeng Mi , Zhuocheng Ding , Robert Hoo , Xiaoyao Li , Like Xu , Zhao Liu Subject: [PATCH RESEND 16/18] i386: Fix NumSharingCache for CPUID[0x8000001D].EAX[bits 25:14] Date: Mon, 13 Feb 2023 17:36:23 +0800 Message-Id: <20230213093625.158170-17-zhao1.liu@linux.intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230213093625.158170-1-zhao1.liu@linux.intel.com> References: <20230213093625.158170-1-zhao1.liu@linux.intel.com> 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: none client-ip=134.134.136.20; envelope-from=zhao1.liu@linux.intel.com; helo=mga02.intel.com X-Spam_score_int: -42 X-Spam_score: -4.3 X-Spam_bar: ---- X-Spam_report: (-4.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_NONE=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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @intel.com) X-ZM-MESSAGEID: 1676280955659100001 Content-Type: text/plain; charset="utf-8" From: Zhao Liu From AMD's APM, NumSharingCache (CPUID[0x8000001D].EAX[bits 25:14]) means [1]: The number of logical processors sharing this cache is the value of this field incremented by 1. To determine which logical processors are sharing a cache, determine a Share Id for each processor as follows: ShareId =3D LocalApicId >> log2(NumSharingCache+1) Logical processors with the same ShareId then share a cache. If NumSharingCache+1 is not a power of two, round it up to the next power of two. From the description above, the caculation of this feild should be same as CPUID[4].EAX[bits 25:14] for intel cpus. So also use the offsets of APIC ID to caculate this field. Note: I don't have the hardware available, hope someone can help me to confirm whether this calculation is correct, thanks! [1]: APM, vol.3, appendix.E.4.15 Function 8000_001Dh--Cache Topology Information Signed-off-by: Zhao Liu --- target/i386/cpu.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index 96ef96860604..d691c02e3c06 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -355,7 +355,7 @@ static void encode_cache_cpuid8000001d(CPUCacheInfo *ca= che, uint32_t *eax, uint32_t *ebx, uint32_t *ecx, uint32_t *edx) { - uint32_t l3_threads; + uint32_t sharing_apic_ids; assert(cache->size =3D=3D cache->line_size * cache->associativity * cache->partitions * cache->sets); =20 @@ -364,13 +364,11 @@ static void encode_cache_cpuid8000001d(CPUCacheInfo *= cache, =20 /* L3 is shared among multiple cores */ if (cache->level =3D=3D 3) { - l3_threads =3D topo_info->modules_per_die * - topo_info->cores_per_module * - topo_info->threads_per_core; - *eax |=3D (l3_threads - 1) << 14; + sharing_apic_ids =3D 1 << apicid_die_offset(topo_info); } else { - *eax |=3D ((topo_info->threads_per_core - 1) << 14); + sharing_apic_ids =3D 1 << apicid_core_offset(topo_info); } + *eax |=3D (sharing_apic_ids - 1) << 14; =20 assert(cache->line_size > 0); assert(cache->partitions > 0); --=20 2.34.1