From nobody Tue Feb 10 17:13:58 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.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 Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1768205470554731.7433432739058; Mon, 12 Jan 2026 00:11:10 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vfCzK-0003mB-4J; Mon, 12 Jan 2026 03:09:22 -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 1vfCxe-0003Kc-JS for qemu-devel@nongnu.org; Mon, 12 Jan 2026 03:07:38 -0500 Received: from mail.loongson.cn ([114.242.206.163]) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vfCxZ-00052M-Ly for qemu-devel@nongnu.org; Mon, 12 Jan 2026 03:07:37 -0500 Received: from loongson.cn (unknown [10.2.5.213]) by gateway (Coremail) with SMTP id _____8BxHMPBq2Rp4coHAA--.24756S3; Mon, 12 Jan 2026 16:07:29 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.213]) by front1 (Coremail) with SMTP id qMiowJDxB8G6q2Rptr8aAA--.41555S5; Mon, 12 Jan 2026 16:07:28 +0800 (CST) From: Bibo Mao To: Song Gao , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Cc: Jiaxun Yang , qemu-devel@nongnu.org Subject: [PATCH v3 3/4] target/loongarch: Add host CPU model in kvm mode Date: Mon, 12 Jan 2026 16:07:20 +0800 Message-Id: <20260112080721.3319572-4-maobibo@loongson.cn> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20260112080721.3319572-1-maobibo@loongson.cn> References: <20260112080721.3319572-1-maobibo@loongson.cn> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: qMiowJDxB8G6q2Rptr8aAA--.41555S5 X-CM-SenderInfo: xpdruxter6z05rqj20fqof0/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== 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 (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=114.242.206.163; envelope-from=maobibo@loongson.cn; helo=mail.loongson.cn X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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: qemu development 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-ZM-MESSAGEID: 1768205472786158500 Content-Type: text/plain; charset="utf-8" Host CPU model is basically the same with max CPU model, except Product ID and CPU model name. With host CPU model, Product ID comes from cpucfg0 and CPU model comes from /proc/cpuinfo. Signed-off-by: Bibo Mao --- target/loongarch/cpu.c | 94 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 94 insertions(+) diff --git a/target/loongarch/cpu.c b/target/loongarch/cpu.c index dffe6f652f..f9255c4f84 100644 --- a/target/loongarch/cpu.c +++ b/target/loongarch/cpu.c @@ -429,6 +429,97 @@ static void loongarch_max_initfn(Object *obj) } } =20 +#if defined(CONFIG_KVM) +static int read_cpuinfo(const char *field, char *value, int len) +{ + FILE *f; + int ret =3D -1; + int field_len =3D strlen(field); + char line[512]; + + f =3D fopen("/proc/cpuinfo", "r"); + if (!f) { + return -1; + } + + do { + if (!fgets(line, sizeof(line), f)) { + break; + } + if (!strncmp(line, field, field_len)) { + strncpy(value, line, len); + ret =3D 0; + break; + } + } while (*line); + + fclose(f); + + return ret; +} + +static uint64_t get_host_cpu_model(void) +{ + char line[512]; + char *ns; + static uint64_t cpuid; + + if (cpuid) { + return cpuid; + } + + if (read_cpuinfo("Model Name", line, sizeof(line))) { + return 0; + } + + ns =3D strchr(line, ':'); + if (!ns) { + return 0; + } + + ns =3D strstr(ns, "Loongson-"); + if (!ns) { + return 0; + } + + ns +=3D strlen("Loongson-"); + memccpy((void *)&cpuid, ns, 0, 8); + return cpuid; +} + +static uint32_t get_host_cpucfg(int number) +{ + unsigned int data =3D 0; + +#ifdef __loongarch__ + asm volatile("cpucfg %[val], %[reg]" + : [val] "=3Dr" (data) + : [reg] "r" (number) + : "memory"); +#endif + + return data; +} + +static void loongarch_host_initfn(Object *obj) +{ + uint32_t data; + uint64_t cpuid; + LoongArchCPU *cpu =3D LOONGARCH_CPU(obj); + + loongarch_max_initfn(obj); + data =3D get_host_cpucfg(0); + if (data) { + cpu->env.cpucfg[0] =3D data; + } + + cpuid =3D get_host_cpu_model(); + if (cpuid) { + cpu->env.cpu_id =3D cpuid; + } +} +#endif + static void loongarch_cpu_reset_hold(Object *obj, ResetType type) { uint8_t tlb_ps; @@ -780,6 +871,9 @@ static const TypeInfo loongarch_cpu_type_infos[] =3D { DEFINE_LOONGARCH_CPU_TYPE(64, "la464", loongarch_la464_initfn), DEFINE_LOONGARCH_CPU_TYPE(32, "la132", loongarch_la132_initfn), DEFINE_LOONGARCH_CPU_TYPE(64, "max", loongarch_max_initfn), +#if defined(CONFIG_KVM) + DEFINE_LOONGARCH_CPU_TYPE(64, "host", loongarch_host_initfn), +#endif }; =20 DEFINE_TYPES(loongarch_cpu_type_infos) --=20 2.39.3