From nobody Tue Nov 26 16:18:07 2024 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=1706695614; cv=none; d=zohomail.com; s=zohoarc; b=JK91xRY/bzCR+/1RSL3u4f7uAQbYiBfZwUasG3oz7Q0ZEuGChPUMebm1jgVYqRJkopm3NVNJSy93r1gu98o/Nwh/8rLkZtdC2CFXKGskPBSEnZjOAd8E8OkNMmzglLTxjjhk3BglUWwweG4t4qZ6dRULlFHR2ufx6zOx/zBoIGs= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1706695614; 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=HtBOSAgOiw7dVr/I1xo9G03Thi753f+zSYapOeI1l1Y=; b=Olo2BtvvRfLnTcRH7d5WVl+4nnrjn5Tl5mxDfvihT5CQkCN6YCsjiV+bTOrRHkvXKRt7DRewg/Jdi6otgquQimcMIl+roWYmE3DO3H+TX1iBoA00ikFLzMDGjCv8VNyOsWd16UbduRhQD9gw3v2Tc53B6r7VdwX5SAI1slad82s= 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 1706695614125258.96808388181705; Wed, 31 Jan 2024 02:06:54 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rV7Ra-0007BC-VJ; Wed, 31 Jan 2024 05:03:47 -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 1rV7QG-0005Xu-LG for qemu-devel@nongnu.org; Wed, 31 Jan 2024 05:02:28 -0500 Received: from mgamail.intel.com ([192.198.163.7]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rV7QD-0008RJ-Mn for qemu-devel@nongnu.org; Wed, 31 Jan 2024 05:02:23 -0500 Received: from fmviesa003.fm.intel.com ([10.60.135.143]) by fmvoesa101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 Jan 2024 02:02:10 -0800 Received: from liuzhao-optiplex-7080.sh.intel.com ([10.239.160.36]) by fmviesa003.fm.intel.com with ESMTP; 31 Jan 2024 02:02:05 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1706695341; x=1738231341; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=Ws6SEsvA0gV8jPYJi1lTDlMM4H0faGxYCTjuKCM2OZo=; b=lI0qF/8JddKtJxs27FeZAloXimpZSvyqYuNdPoBirxoe4QlfbHuir4TF BVat/yxQ5fw6pzJLKHWzeFL5GCaIJYwNz8ATS171OM1aYuk2ge6GpKxFH qyXogrpwa+EgJIIsUd1472R17REgYxnrCXPVNsT0pC3nDzlOO3yW0IZC2 ZjRssEmDfxDe9fh7ELjLUwIYIu6O7y5UDQ1HLJMsQnqIMjmAOytRtHik3 V04eOTRJ2RzhI8HgfB+StUlltDuiNTnWp6eT9AahB0JLZh8SgQYaqw6A5 S8CLN0TzBWk/Q68WGOa2XGKK40l9mBcXnbB99okhjexgozWD+5/OqPqTh g==; X-IronPort-AV: E=McAfee;i="6600,9927,10969"; a="25033102" X-IronPort-AV: E=Sophos;i="6.05,231,1701158400"; d="scan'208";a="25033102" X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.05,231,1701158400"; d="scan'208";a="4036359" From: Zhao Liu To: Eduardo Habkost , Marcel Apfelbaum , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Yanan Wang , "Michael S . Tsirkin" , Paolo Bonzini , Richard Henderson , Eric Blake , Markus Armbruster , Marcelo Tosatti Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org, Babu Moger , Xiaoyao Li , Zhenyu Wang , Zhuocheng Ding , Yongwei Ma , Zhao Liu Subject: [PATCH v8 20/21] i386/cpu: Use CPUCacheInfo.share_level to encode CPUID[4] Date: Wed, 31 Jan 2024 18:13:49 +0800 Message-Id: <20240131101350.109512-21-zhao1.liu@linux.intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240131101350.109512-1-zhao1.liu@linux.intel.com> References: <20240131101350.109512-1-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=192.198.163.7; envelope-from=zhao1.liu@linux.intel.com; helo=mgamail.intel.com X-Spam_score_int: -32 X-Spam_score: -3.3 X-Spam_bar: --- X-Spam_report: (-3.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.292, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_NONE=0.001, T_SCC_BODY_TEXT_LINE=-0.01 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: 1706695614460100001 Content-Type: text/plain; charset="utf-8" From: Zhao Liu CPUID[4].EAX[bits 25:14] is used to represent the cache topology for Intel CPUs. After cache models have topology information, we can use CPUCacheInfo.share_level to decide which topology level to be encoded into CPUID[4].EAX[bits 25:14]. And since with the helper max_processor_ids_for_cache(), the filed CPUID[4].EAX[bits 25:14] (original virable "num_apic_ids") is parsed based on cpu topology levels, which are verified when parsing -smp, it's no need to check this value by "assert(num_apic_ids > 0)" again, so remove this assert(). Additionally, wrap the encoding of CPUID[4].EAX[bits 31:26] into a helper to make the code cleaner. Tested-by: Yongwei Ma Signed-off-by: Zhao Liu --- Changes since v7: * Renamed max_processor_ids_for_cache() to max_thread_ids_for_cache(). (Xiaoyao) * Dropped Michael/Babu's ACKed/Tested tags since the code change. * Re-added Yongwei's Tested tag For his re-testing. Changes since v1: * Used "enum CPUTopoLevel share_level" as the parameter in max_processor_ids_for_cache(). * Made cache_into_passthrough case also use max_processor_ids_for_cache() and max_core_ids_in_package() to encode CPUID[4]. (Yanan) * Renamed the title of this patch (the original is "i386: Use CPUCacheInfo.share_level to encode CPUID[4].EAX[bits 25:14]"). --- target/i386/cpu.c | 76 ++++++++++++++++++++++++++++------------------- 1 file changed, 45 insertions(+), 31 deletions(-) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index f167df4f6df1..fbfebdc2caf3 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -235,22 +235,53 @@ static uint8_t cpuid2_cache_descriptor(CPUCacheInfo *= cache) ((t) =3D=3D UNIFIED_CACHE) ? CACHE_TYPE_UNIFIED : \ 0 /* Invalid value */) =20 +static uint32_t max_thread_ids_for_cache(X86CPUTopoInfo *topo_info, + enum CPUTopoLevel share_level) +{ + uint32_t num_ids =3D 0; + + switch (share_level) { + case CPU_TOPO_LEVEL_CORE: + num_ids =3D 1 << apicid_core_offset(topo_info); + break; + case CPU_TOPO_LEVEL_DIE: + num_ids =3D 1 << apicid_die_offset(topo_info); + break; + case CPU_TOPO_LEVEL_PACKAGE: + num_ids =3D 1 << apicid_pkg_offset(topo_info); + break; + default: + /* + * Currently there is no use case for SMT and MODULE, so use + * assert directly to facilitate debugging. + */ + g_assert_not_reached(); + } + + return num_ids - 1; +} + +static uint32_t max_core_ids_in_package(X86CPUTopoInfo *topo_info) +{ + uint32_t num_cores =3D 1 << (apicid_pkg_offset(topo_info) - + apicid_core_offset(topo_info)); + return num_cores - 1; +} =20 /* Encode cache info for CPUID[4] */ static void encode_cache_cpuid4(CPUCacheInfo *cache, - int num_apic_ids, int num_cores, + X86CPUTopoInfo *topo_info, uint32_t *eax, uint32_t *ebx, uint32_t *ecx, uint32_t *edx) { assert(cache->size =3D=3D cache->line_size * cache->associativity * cache->partitions * cache->sets); =20 - assert(num_apic_ids > 0); *eax =3D CACHE_TYPE(cache->type) | CACHE_LEVEL(cache->level) | (cache->self_init ? CACHE_SELF_INIT_LEVEL : 0) | - ((num_cores - 1) << 26) | - ((num_apic_ids - 1) << 14); + (max_core_ids_in_package(topo_info) << 26) | + (max_thread_ids_for_cache(topo_info, cache->share_level) << 14); =20 assert(cache->line_size > 0); assert(cache->partitions > 0); @@ -6246,10 +6277,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index,= uint32_t count, (cpuid2_cache_descriptor(env->cache_info_cpuid2.l1i_cache) = << 8) | (cpuid2_cache_descriptor(env->cache_info_cpuid2.l2_cache)); break; - case 4: { - int addressable_cores_width; - int addressable_threads_width; - + case 4: /* cache info: needed for Core compatibility */ if (cpu->cache_info_passthrough) { x86_cpu_get_cache_cpuid(index, count, eax, ebx, ecx, edx); @@ -6261,55 +6289,42 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index= , uint32_t count, int host_vcpus_per_cache =3D 1 + ((*eax & 0x3FFC000) >> 14= ); =20 if (cores_per_pkg > 1) { - addressable_cores_width =3D apicid_pkg_offset(&topo_in= fo) - - apicid_core_offset(&topo_inf= o); - *eax &=3D ~0xFC000000; - *eax |=3D ((1 << addressable_cores_width) - 1) << 26; + *eax |=3D max_core_ids_in_package(&topo_info) << 26; } if (host_vcpus_per_cache > threads_per_pkg) { - /* Share the cache at package level. */ - addressable_threads_width =3D apicid_pkg_offset(&topo_= info); - *eax &=3D ~0x3FFC000; - *eax |=3D ((1 << addressable_threads_width) - 1) << 14; + + /* Share the cache at package level. */ + *eax |=3D max_thread_ids_for_cache(&topo_info, + CPU_TOPO_LEVEL_PACKAGE) << 14; } } } else if (cpu->vendor_cpuid_only && IS_AMD_CPU(env)) { *eax =3D *ebx =3D *ecx =3D *edx =3D 0; } else { *eax =3D 0; - addressable_cores_width =3D apicid_pkg_offset(&topo_info) - - apicid_core_offset(&topo_info); =20 switch (count) { case 0: /* L1 dcache info */ - addressable_threads_width =3D apicid_core_offset(&topo_inf= o); encode_cache_cpuid4(env->cache_info_cpuid4.l1d_cache, - (1 << addressable_threads_width), - (1 << addressable_cores_width), + &topo_info, eax, ebx, ecx, edx); break; case 1: /* L1 icache info */ - addressable_threads_width =3D apicid_core_offset(&topo_inf= o); encode_cache_cpuid4(env->cache_info_cpuid4.l1i_cache, - (1 << addressable_threads_width), - (1 << addressable_cores_width), + &topo_info, eax, ebx, ecx, edx); break; case 2: /* L2 cache info */ - addressable_threads_width =3D apicid_core_offset(&topo_inf= o); encode_cache_cpuid4(env->cache_info_cpuid4.l2_cache, - (1 << addressable_threads_width), - (1 << addressable_cores_width), + &topo_info, eax, ebx, ecx, edx); break; case 3: /* L3 cache info */ if (cpu->enable_l3_cache) { - addressable_threads_width =3D apicid_die_offset(&topo_= info); encode_cache_cpuid4(env->cache_info_cpuid4.l3_cache, - (1 << addressable_threads_width), - (1 << addressable_cores_width), + &topo_info, eax, ebx, ecx, edx); break; } @@ -6320,7 +6335,6 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, = uint32_t count, } } break; - } case 5: /* MONITOR/MWAIT Leaf */ *eax =3D cpu->mwait.eax; /* Smallest monitor-line size in bytes */ --=20 2.34.1