From patchwork Tue Oct 8 13:33:26 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chuang Xu X-Patchwork-Id: 13826486 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id ABC70CEF174 for ; Tue, 8 Oct 2024 13:34:21 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1syALf-0002wz-91; Tue, 08 Oct 2024 09:33:59 -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 1syALc-0002pQ-Tw for qemu-devel@nongnu.org; Tue, 08 Oct 2024 09:33:57 -0400 Received: from mail-pf1-x431.google.com ([2607:f8b0:4864:20::431]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1syALY-0000U3-6w for qemu-devel@nongnu.org; Tue, 08 Oct 2024 09:33:56 -0400 Received: by mail-pf1-x431.google.com with SMTP id d2e1a72fcca58-71e029efecdso1832125b3a.3 for ; Tue, 08 Oct 2024 06:33:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1728394430; x=1728999230; darn=nongnu.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=4KyCMqBV9tXcblqUlbQ/JGQVDhsuA9Y9d8nGwm2bfZc=; b=OWwzWayQHDZuxgv8x1Ep2bYiMhB1KcP/M165Czoz/ntbEmpZ2DGO8LhhPDo5S268A7 XaizsDqvjSu18HhEGPNg/vBNgwfpa+eH9qopKVb8ZMtr2R1nBi5qIt5w1abBr9ikr8UW /z6ftrlZi65/b29F1ymfeHdAqV5NGfI1QtAmaJ4m+IHq2Yc5NRtVPhF86Sec0E13+GXx ty5opApwW1If2QE8HnjfWPmh2yhlxM6Aoxxp2S4vNsKWEimY+GevlGitRgn/Jec/O+gJ wZKGrRCPWttsLnuFTO7Y79fN46zEbuhpZBkQbKG22Z7rCW9Zvw9380/zj1t+H4laFgBF aGIw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1728394430; x=1728999230; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=4KyCMqBV9tXcblqUlbQ/JGQVDhsuA9Y9d8nGwm2bfZc=; b=NzJmKg4mC+KUkvV4mTuZ1jrQzsyolSbliR5Yeegw6I1FeSFAbRedPT1Qi6nIOsvfwL RDTh7XTJBC9z3Uzv3U3d2YQ8ZVZYlDFSMJBCy5n6MwFlAmoDY7TYOefcxkRMfiQ5F6+m OOKNLaDtWr793dKkl/x5H97D3H6W8j9kXwDziXFX8+3i5ewNmgTldXogSl18u2WCo6q1 vg505n+GEuLn/HrKc9RxJGuEcAISaX+Zqry5S8ET5803hNvLFLcN6Tifp/U90tSIkmnM qcZw1GiU9bUi4EN7gvIs0LmTkY3xCa071IdM11LFzj2GESoQ6hlga80aFTx7lyiHqrm7 acgA== X-Gm-Message-State: AOJu0YwMZ111BiV0PawflTF9TIhqNX4/xPUkcqB86cRckKkplsS8Mn1d kwYRZkix/WZg8osOtefeRxg+tXsvtHI4+ZQPrPKYx64f+gg/y0zKBx4KbdCJR4gaynqn5jtRTWp s X-Google-Smtp-Source: AGHT+IFFoBwYi805MM1/ot/cky1pOUC94irUzKEFH2ZU/lw3PQ/HKPAFoTXva60P9ujxL6u3/OpOvQ== X-Received: by 2002:a05:6a20:2d1f:b0:1d7:5ea:22d with SMTP id adf61e73a8af0-1d705ea0311mr5550259637.47.1728394430231; Tue, 08 Oct 2024 06:33:50 -0700 (PDT) Received: from KK6FJ77W06.bytedance.net ([203.208.167.150]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-7e9f683eddasm5827689a12.56.2024.10.08.06.33.46 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Tue, 08 Oct 2024 06:33:49 -0700 (PDT) From: Chuang Xu To: qemu-devel@nongnu.org Cc: pbonzini@redhat.com, imammedo@redhat.com, xieyongji@bytedance.com, chaiwen.cc@bytedance.com, zhao1.liu@intel.com, qemu-stable@nongnu.org, Chuang Xu , Guixiong Wei , Yipeng Yin Subject: [PATCH v5] i386/cpu: fixup number of addressable IDs for logical processors in the physical package Date: Tue, 8 Oct 2024 21:33:26 +0800 Message-Id: <20241008133326.26767-1-xuchuangxclwt@bytedance.com> X-Mailer: git-send-email 2.39.3 (Apple Git-146) MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::431; envelope-from=xuchuangxclwt@bytedance.com; helo=mail-pf1-x431.google.com X-Spam_score_int: -8 X-Spam_score: -0.9 X-Spam_bar: / X-Spam_report: (-0.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FROM_LOCAL_NOVOWEL=0.5, HK_RANDOM_ENVFROM=0.001, HK_RANDOM_FROM=0.66, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org When QEMU is started with: -cpu host,migratable=on,host-cache-info=on,l3-cache=off -smp 180,sockets=2,dies=1,cores=45,threads=2 When executing "cpuid -1 -l 1 -r" in the guest, we obtain a value of 90 for CPUID.01H.EBX[23:16], whereas the expected value is 128. Additionally, executing "cpuid -1 -l 4 -r" in the guest yields a value of 63 for CPUID.04H.EAX[31:26], which matches the expected result. As (1+CPUID.04H.EAX[31:26]) rounds up to the nearest power-of-2 integer, we'd beter round up CPUID.01H.EBX[23:16] to the nearest power-of-2 integer too. Otherwise we may encounter unexpected results in guest. For example, when QEMU is started with CLI above and xtopology is disabled, guest kernel 5.15.120 uses CPUID.01H.EBX[23:16]/(1+CPUID.04H.EAX[31:26]) to calculate threads-per-core in detect_ht(). Then guest will get "90/(1+63)=1" as the result, even though threads-per-core should actually be 2. So let us round up CPUID.01H.EBX[23:16] to the nearest power-of-2 integer to solve the unexpected result. In addition, we introduce max_thread_number_in_package() instead of using pow2ceil() to be compatible with smp and hybrid. Reviewed-by: Zhao Liu Acked-by: Igor Mammedov Signed-off-by: Guixiong Wei Signed-off-by: Yipeng Yin Signed-off-by: Chuang Xu --- 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 ff227a8c5c..0749efc52c 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -6462,7 +6462,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count, } *edx = env->features[FEAT_1_EDX]; if (threads_per_pkg > 1) { - *ebx |= threads_per_pkg << 16; + *ebx |= 1 << apicid_pkg_offset(&topo_info) << 16; *edx |= CPUID_HT; } if (!cpu->enable_pmu) {