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Wed, 18 Sep 2024 06:18:54 -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 v3] i386/cpu: fixup number of addressable IDs for logical processors in the physical package Date: Wed, 18 Sep 2024 21:18:15 +0800 Message-Id: <20240918131815.8543-1-xuchuangxclwt@bytedance.com> X-Mailer: git-send-email 2.24.3 (Apple Git-128) 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: pass client-ip=2607:f8b0:4864:20::62a; envelope-from=xuchuangxclwt@bytedance.com; helo=mail-pl1-x62a.google.com X-Spam_score_int: -15 X-Spam_score: -1.6 X-Spam_bar: - X-Spam_report: (-1.6 / 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=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable 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 @bytedance.com) X-ZM-MESSAGEID: 1726665560643116600 Content-Type: text/plain; charset="utf-8" When QEMU is started with: -cpu host,migratable=3Don,host-cache-info=3Don,l3-cache=3Doff -smp 180,sockets=3D2,dies=3D1,cores=3D45,threads=3D2 Try to execute "cpuid -1 -l 1 -r" in guest, we'll obtain a value of 90 for CPUID.01H.EBX[23:16], while the expected value is 128. And Try to execute "cpuid -1 -l 4 -r" in guest, we'll obtain a value of 63 for CPUID.04H.EAX[31:26] as expected. As (1+CPUID.04H.EAX[31:26]) round 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)= =3D1" as the result, even though theads-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. Signed-off-by: Guixiong Wei Signed-off-by: Yipeng Yin Signed-off-by: Chuang Xu Reviewed-by: Igor Mammedov --- 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 4c2e6f3a71..3710ae5283 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -6417,7 +6417,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, = uint32_t count, } *edx =3D env->features[FEAT_1_EDX]; if (threads_per_pkg > 1) { - *ebx |=3D threads_per_pkg << 16; + *ebx |=3D pow2ceil(threads_per_pkg) << 16; *edx |=3D CPUID_HT; } if (!cpu->enable_pmu) { --=20 2.20.1