From patchwork Fri Nov 1 08:33:23 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhao Liu X-Patchwork-Id: 13858896 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.16]) (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 67E3314D29B for ; Fri, 1 Nov 2024 08:16:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.16 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730448966; cv=none; b=oxS8PQsZfUmoxSoxdpgyFDmEH/XVJLU9fwfQ+EhsbXoJPXxL8mYVYOGLiZPwSQTJUpuvLG9ld2nczbPwO+uaBv9JGM7okUAJarOjcxdtO6n/8oohi8TNEceqDJcpbBLxwu8LOegx6S7FXcbE5mki40JNm8AEaZ2kmyKjXoDjUq0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730448966; c=relaxed/simple; bh=1dPWfn08NUNqOZ5PO7IBAQYY2uK5uWynR2m08PGiW3k=; h=From:To:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=nmwH+CmXdXZaMTS/NT5MSA5X2z7UsW29x2/d07KDApuSrPwjYwjHxJKhikYAwgfq3G3rJg7yuwFzyaIelufHzlxJLYcSwu2iVw4fe7KF74+qOCQFho/blRBvoMnNcuYlPOP3G995QOiOqSW2JZuyEwAkZ4GaTA/wWzPYsTYgpkg= 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=l6zpyYvF; arc=none smtp.client-ip=192.198.163.16 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="l6zpyYvF" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1730448965; x=1761984965; h=from:to:subject:date:message-id:in-reply-to:references: mime-version:content-transfer-encoding; bh=1dPWfn08NUNqOZ5PO7IBAQYY2uK5uWynR2m08PGiW3k=; b=l6zpyYvFGX7ygqc2KMqdauMp7YVuElBuWXs50/UZ6KsB4oRUOQIK9Cib fFmsn9QtBsG3VbIkUoysgNmBQ2dRELFNZXMsoZzQOMKeSa/7KZVj2jZBK RsfEiF6gftKLdPVt1BfSkQltLSvvtp1UezCwYNhTKjyZ5DLBnrG2KKHgv PjNSwh9p1mbRPPjjgtJMRGMryLdWMiJ+Tz4jdNfu8vQGWlvm3Ts+qbmYB WCPeBCGMaGn732kKkB5E4EKgvTsNj9jMTah4PgG+VWTdrBRc77gYiwJmv LJrTyW8DDVWgKWMqP1RcVE+7ZhVcADSy7nOq6sg8CCMqFjwZ3p2D9F4Kr g==; X-CSE-ConnectionGUID: NkchP2vqSbG5ucEo/HF7VQ== X-CSE-MsgGUID: +NQerxLuROmhlf9YXSyJQw== X-IronPort-AV: E=McAfee;i="6700,10204,11242"; a="17846005" X-IronPort-AV: E=Sophos;i="6.11,249,1725346800"; d="scan'208";a="17846005" Received: from fmviesa003.fm.intel.com ([10.60.135.143]) by fmvoesa110.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Nov 2024 01:16:04 -0700 X-CSE-ConnectionGUID: LUBhdBhGQwKOVlizCOoROQ== X-CSE-MsgGUID: R3gWI9O9St23dpn0CDALbw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.11,249,1725346800"; d="scan'208";a="86834558" Received: from liuzhao-optiplex-7080.sh.intel.com ([10.239.160.36]) by fmviesa003.fm.intel.com with ESMTP; 01 Nov 2024 01:15:59 -0700 From: Zhao Liu To: =?utf-8?q?Daniel_P_=2E_Berrang=C3=A9?= , Igor Mammedov , Eduardo Habkost , Marcel Apfelbaum , =?utf-8?q?Philippe_Mathieu-D?= =?utf-8?q?aud=C3=A9?= , Yanan Wang , "Michael S . Tsirkin" , Paolo Bonzini , Richard Henderson , Eric Blake , Markus Armbruster , Marcelo Tosatti , =?utf-8?q?Alex_Benn=C3=A9e?= , Peter Maydell , Jonathan Cameron , Sia Jee Heng , Alireza Sanaee , qemu-devel@nongnu.org, kvm@vger.kernel.org, qemu-riscv@nongnu.org, qemu-arm@nongnu.org, Zhenyu Wang , Dapeng Mi , Zhao Liu Subject: [PATCH v5 1/9] i386/cpu: Don't enumerate the "invalid" CPU topology level Date: Fri, 1 Nov 2024 16:33:23 +0800 Message-Id: <20241101083331.340178-2-zhao1.liu@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241101083331.340178-1-zhao1.liu@intel.com> References: <20241101083331.340178-1-zhao1.liu@intel.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In the follow-up change, the CPU topology enumeration will be moved to QAPI. And considerring "invalid" should not be exposed to QAPI as an unsettable item, so, as a preparation for future changes, remove "invalid" level from the current CPU topology enumeration structure and define it by a macro instead. Due to the removal of the enumeration of "invalid", bit 0 of CPUX86State.avail_cpu_topo bitmap will no longer correspond to "invalid" level, but will start at the SMT level. Therefore, to honor this change, update the encoding rule for CPUID[0x1F]. Signed-off-by: Zhao Liu Reviewed-by: Jonathan Cameron --- Tested by the following cases to ensure 0x1f's behavior hasn't changed: -smp cpus=24,sockets=2,dies=3,modules=2,cores=2,threads=1 -smp cpus=24,sockets=2,dies=1,modules=3,cores=2,threads=2 -smp cpus=24,sockets=2,modules=3,cores=2,threads=2 -smp cpus=24,sockets=2,dies=3,modules=1,cores=2,threads=2 -smp cpus=24,sockets=2,dies=3,cores=2,threads=2 --- Changes since Patch v3: * Now commit to stop exposing "invalid" enumeration in QAPI. (Daniel) --- include/hw/i386/topology.h | 3 ++- target/i386/cpu.c | 13 ++++++++----- 2 files changed, 10 insertions(+), 6 deletions(-) diff --git a/include/hw/i386/topology.h b/include/hw/i386/topology.h index dff49fce1154..48b43edc5a90 100644 --- a/include/hw/i386/topology.h +++ b/include/hw/i386/topology.h @@ -62,6 +62,8 @@ typedef struct X86CPUTopoInfo { unsigned threads_per_core; } X86CPUTopoInfo; +#define CPU_TOPO_LEVEL_INVALID CPU_TOPO_LEVEL_MAX + /* * CPUTopoLevel is the general i386 topology hierarchical representation, * ordered by increasing hierarchical relationship. @@ -69,7 +71,6 @@ typedef struct X86CPUTopoInfo { * or AMD (CPUID[0x80000026]). */ enum CPUTopoLevel { - CPU_TOPO_LEVEL_INVALID, CPU_TOPO_LEVEL_SMT, CPU_TOPO_LEVEL_CORE, CPU_TOPO_LEVEL_MODULE, diff --git a/target/i386/cpu.c b/target/i386/cpu.c index 3baa95481fbc..ca13cf66a787 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -370,20 +370,21 @@ static void encode_topo_cpuid1f(CPUX86State *env, uint32_t count, uint32_t *ecx, uint32_t *edx) { X86CPU *cpu = env_archcpu(env); - unsigned long level, next_level; + unsigned long level, base_level, next_level; uint32_t num_threads_next_level, offset_next_level; - assert(count + 1 < CPU_TOPO_LEVEL_MAX); + assert(count <= CPU_TOPO_LEVEL_PACKAGE); /* * Find the No.(count + 1) topology level in avail_cpu_topo bitmap. - * The search starts from bit 1 (CPU_TOPO_LEVEL_INVALID + 1). + * The search starts from bit 0 (CPU_TOPO_LEVEL_SMT). */ - level = CPU_TOPO_LEVEL_INVALID; + level = CPU_TOPO_LEVEL_SMT; + base_level = level; for (int i = 0; i <= count; i++) { level = find_next_bit(env->avail_cpu_topo, CPU_TOPO_LEVEL_PACKAGE, - level + 1); + base_level); /* * CPUID[0x1f] doesn't explicitly encode the package level, @@ -394,6 +395,8 @@ static void encode_topo_cpuid1f(CPUX86State *env, uint32_t count, level = CPU_TOPO_LEVEL_INVALID; break; } + /* Search the next level. */ + base_level = level + 1; } if (level == CPU_TOPO_LEVEL_INVALID) {