From patchwork Wed Apr 24 15:49:16 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Zhao Liu X-Patchwork-Id: 13642068 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.13]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A232A16079C for ; Wed, 24 Apr 2024 15:36:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.13 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713972999; cv=none; b=YLKaBAFCYkEI9I++PgU9jFqJosD9dysnm/M+gpXkRQxSPEq8ZgrzXzvzV3c8RNHiyJ/LqBPZuB8LEn/o8jEo9zP/GR/2FZkP4WIRru+ieG9Gobhb+zqoKGSpgHufkYv9EwsWh4XHvJj/htBASxp+f3h0qM8ufI2LejZRWHYw/4U= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713972999; c=relaxed/simple; bh=l/pgfos9pSMOosq2Hj5bUnDrab4aBTjWVffYw2fMNN0=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version:Content-Type; b=qSMVrkngJkR/9uY3/CGfOx0xfRir0J3sT4e5QTZuO61gjsBy/1KIo75u7BtdoZpjN41f7NW8eL0IrNk0e9c0aS8ZRM6UqwwT3l7i2hI6exThf0sK3Z5gV2Ra+l3ZrK6rpofn4xSd/yhs3Jy+l7mO0ZS4EROYI/O82N10CS4lPC8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=VI794jNk; arc=none smtp.client-ip=192.198.163.13 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="VI794jNk" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1713972998; x=1745508998; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=l/pgfos9pSMOosq2Hj5bUnDrab4aBTjWVffYw2fMNN0=; b=VI794jNkiSbhUDFPRvqxCIiElP6MlMmgurr2fRjQFBb5WBrv+hAcyl6I 95RnMohybaJXGpWP258V4X8zClIYXI9RQwBeqz7sMSUCd2XIi2bZ5oWCu TIHVIiz6UpJ88I1Dnh9w6IobpTrbaD3YeT3t0M7z6z97aU4cTnxzJ48d5 cLzgohaeOg3lvVamnaHjWN/ueYw0YSRri5n/Ag1gjMa5DsvjXMg7Q2Ro/ OMQttQge96yQ0ziWemgKM+h0v35QqHaWUdv3IZItziAeT0mVk7e2lKk2x 6c4rZvLNztN2Pc9zbFsmiCcQJJ2Lyit2/OAwqY918tBtR7I2LnX6uJKOa Q==; X-CSE-ConnectionGUID: kyadf744RDe1NJymPeq/0w== X-CSE-MsgGUID: jtwA+wgiRHa7f3CMjV/cKA== X-IronPort-AV: E=McAfee;i="6600,9927,11054"; a="12545670" X-IronPort-AV: E=Sophos;i="6.07,226,1708416000"; d="scan'208";a="12545670" Received: from orviesa008.jf.intel.com ([10.64.159.148]) by fmvoesa107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Apr 2024 08:36:37 -0700 X-CSE-ConnectionGUID: skOWEB+3S1ims2aXFP/2XQ== X-CSE-MsgGUID: ZaFY/5bRRw2J89pteXlG8A== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.07,226,1708416000"; d="scan'208";a="25363120" Received: from liuzhao-optiplex-7080.sh.intel.com ([10.239.160.36]) by orviesa008.jf.intel.com with ESMTP; 24 Apr 2024 08:36:33 -0700 From: Zhao Liu To: Eduardo Habkost , Marcel Apfelbaum , =?utf-8?q?Philippe_Mathieu-D?= =?utf-8?q?aud=C3=A9?= , Yanan Wang , "Michael S . Tsirkin" , Richard Henderson , Paolo Bonzini , Eric Blake , Markus Armbruster , Marcelo Tosatti , =?utf-8?q?Daniel_P_=2E_Berrang=C3=A9?= Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org, Zhenyu Wang , Zhuocheng Ding , Babu Moger , Xiaoyao Li , Dapeng Mi , Yongwei Ma , Zhao Liu , Robert Hoo Subject: [PATCH v11 08/21] i386/cpu: Consolidate the use of topo_info in cpu_x86_cpuid() Date: Wed, 24 Apr 2024 23:49:16 +0800 Message-Id: <20240424154929.1487382-9-zhao1.liu@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240424154929.1487382-1-zhao1.liu@intel.com> References: <20240424154929.1487382-1-zhao1.liu@intel.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In cpu_x86_cpuid(), there are many variables in representing the cpu topology, e.g., topo_info, cs->nr_cores and cs->nr_threads. Since the names of cs->nr_cores and cs->nr_threads do not accurately represent its meaning, the use of cs->nr_cores or cs->nr_threads is prone to confusion and mistakes. And the structure X86CPUTopoInfo names its members clearly, thus the variable "topo_info" should be preferred. In addition, in cpu_x86_cpuid(), to uniformly use the topology variable, replace env->dies with topo_info.dies_per_pkg as well. Suggested-by: Robert Hoo Tested-by: Yongwei Ma Signed-off-by: Zhao Liu Reviewed-by: Xiaoyao Li Reviewed-by: Philippe Mathieu-Daudé Tested-by: Babu Moger --- Changes since v9: * Polished the commit message. ( Xiaoyao) Changes since v8: * Added Philippe's reviewed-by tag. Changes since v7: * Renamed cpus_per_pkg to threads_per_pkg. (Xiaoyao) * Dropped Michael/Babu's Acked/Tested tags since the code change. * Re-added Yongwei's Tested tag For his re-testing. * Added Xiaoyao's Reviewed tag. Changes since v3: * Fixed typo. (Babu) Changes since v1: * Extracted cores_per_socket from the code block and use it as a local variable for cpu_x86_cpuid(). (Yanan) * Removed vcpus_per_socket variable and use cpus_per_pkg directly. (Yanan) * Replaced env->dies with topo_info.dies_per_pkg in cpu_x86_cpuid(). --- target/i386/cpu.c | 31 ++++++++++++++++++------------- 1 file changed, 18 insertions(+), 13 deletions(-) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index c13bfed28878..0611f8ffbf8b 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -6153,11 +6153,16 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count, uint32_t limit; uint32_t signature[3]; X86CPUTopoInfo topo_info; + uint32_t cores_per_pkg; + uint32_t threads_per_pkg; topo_info.dies_per_pkg = env->nr_dies; topo_info.cores_per_die = cs->nr_cores / env->nr_dies; topo_info.threads_per_core = cs->nr_threads; + cores_per_pkg = topo_info.cores_per_die * topo_info.dies_per_pkg; + threads_per_pkg = cores_per_pkg * topo_info.threads_per_core; + /* Calculate & apply limits for different index ranges */ if (index >= 0xC0000000) { limit = env->cpuid_xlevel2; @@ -6193,8 +6198,8 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count, *ecx |= CPUID_EXT_OSXSAVE; } *edx = env->features[FEAT_1_EDX]; - if (cs->nr_cores * cs->nr_threads > 1) { - *ebx |= (cs->nr_cores * cs->nr_threads) << 16; + if (threads_per_pkg > 1) { + *ebx |= threads_per_pkg << 16; *edx |= CPUID_HT; } if (!cpu->enable_pmu) { @@ -6242,15 +6247,15 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count, */ if (*eax & 31) { int host_vcpus_per_cache = 1 + ((*eax & 0x3FFC000) >> 14); - int vcpus_per_socket = cs->nr_cores * cs->nr_threads; - if (cs->nr_cores > 1) { + + if (cores_per_pkg > 1) { addressable_cores_width = apicid_pkg_offset(&topo_info) - apicid_core_offset(&topo_info); *eax &= ~0xFC000000; *eax |= ((1 << addressable_cores_width) - 1) << 26; } - if (host_vcpus_per_cache > vcpus_per_socket) { + if (host_vcpus_per_cache > threads_per_pkg) { /* Share the cache at package level. */ addressable_threads_width = apicid_pkg_offset(&topo_info); @@ -6396,12 +6401,12 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count, switch (count) { case 0: *eax = apicid_core_offset(&topo_info); - *ebx = cs->nr_threads; + *ebx = topo_info.threads_per_core; *ecx |= CPUID_TOPOLOGY_LEVEL_SMT; break; case 1: *eax = apicid_pkg_offset(&topo_info); - *ebx = cs->nr_cores * cs->nr_threads; + *ebx = threads_per_pkg; *ecx |= CPUID_TOPOLOGY_LEVEL_CORE; break; default: @@ -6421,7 +6426,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count, break; case 0x1F: /* V2 Extended Topology Enumeration Leaf */ - if (env->nr_dies < 2) { + if (topo_info.dies_per_pkg < 2) { *eax = *ebx = *ecx = *edx = 0; break; } @@ -6431,7 +6436,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count, switch (count) { case 0: *eax = apicid_core_offset(&topo_info); - *ebx = cs->nr_threads; + *ebx = topo_info.threads_per_core; *ecx |= CPUID_TOPOLOGY_LEVEL_SMT; break; case 1: @@ -6441,7 +6446,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count, break; case 2: *eax = apicid_pkg_offset(&topo_info); - *ebx = cs->nr_cores * cs->nr_threads; + *ebx = threads_per_pkg; *ecx |= CPUID_TOPOLOGY_LEVEL_DIE; break; default: @@ -6669,7 +6674,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count, * discards multiple thread information if it is set. * So don't set it here for Intel to make Linux guests happy. */ - if (cs->nr_cores * cs->nr_threads > 1) { + if (threads_per_pkg > 1) { if (env->cpuid_vendor1 != CPUID_VENDOR_INTEL_1 || env->cpuid_vendor2 != CPUID_VENDOR_INTEL_2 || env->cpuid_vendor3 != CPUID_VENDOR_INTEL_3) { @@ -6736,7 +6741,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count, *eax |= (cpu->guest_phys_bits << 16); } *ebx = env->features[FEAT_8000_0008_EBX]; - if (cs->nr_cores * cs->nr_threads > 1) { + if (threads_per_pkg > 1) { /* * Bits 15:12 is "The number of bits in the initial * Core::X86::Apic::ApicId[ApicId] value that indicate @@ -6744,7 +6749,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count, * Bits 7:0 is "The number of threads in the package is NC+1" */ *ecx = (apicid_pkg_offset(&topo_info) << 12) | - ((cs->nr_cores * cs->nr_threads) - 1); + (threads_per_pkg - 1); } else { *ecx = 0; }