From nobody Wed Feb 11 04:20:59 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 1768205453799185.45327959599172; Mon, 12 Jan 2026 00:10:53 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vfCzL-0003n7-9T; Mon, 12 Jan 2026 03:09:23 -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-0003Kd-JX 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-00052O-Mu 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 _____8Cx58HCq2Rp5MoHAA--.12746S3; Mon, 12 Jan 2026 16:07:30 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.213]) by front1 (Coremail) with SMTP id qMiowJDxB8G6q2Rptr8aAA--.41555S6; Mon, 12 Jan 2026 16:07:29 +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 4/4] target/loongarch: Add some CPUCFG bits with host CPU model Date: Mon, 12 Jan 2026 16:07:21 +0800 Message-Id: <20260112080721.3319572-5-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--.41555S6 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: 1768205477945158500 Content-Type: text/plain; charset="utf-8" Some CPUCFG capability bits depend on KVM host hypervsior and they are detected on QEMU. However some CPUCFG bits are irrelative with hypervsior, here these bits are checked from host machine and set for VM with host CPU model. Signed-off-by: Bibo Mao --- target/loongarch/cpu.c | 32 +++++++++++++++++++++++++++++++- target/loongarch/cpu.h | 8 ++++++++ 2 files changed, 39 insertions(+), 1 deletion(-) diff --git a/target/loongarch/cpu.c b/target/loongarch/cpu.c index f9255c4f84..56ae23552b 100644 --- a/target/loongarch/cpu.c +++ b/target/loongarch/cpu.c @@ -503,7 +503,7 @@ static uint32_t get_host_cpucfg(int number) =20 static void loongarch_host_initfn(Object *obj) { - uint32_t data; + uint32_t data, cpucfg, field; uint64_t cpuid; LoongArchCPU *cpu =3D LOONGARCH_CPU(obj); =20 @@ -513,6 +513,36 @@ static void loongarch_host_initfn(Object *obj) cpu->env.cpucfg[0] =3D data; } =20 + /* + * There is no exception in KVM hypervisor when these intructions are + * executed if HW support, KVM hypervisor cannot control this. + * + * Set cpucfg bits which cannot be controlled by KVM hypervisor. + */ + data =3D get_host_cpucfg(2); + cpucfg =3D cpu->env.cpucfg[2]; + field =3D FIELD_EX32(data, CPUCFG2, FRECIPE); + cpucfg =3D FIELD_DP32(cpucfg, CPUCFG2, FRECIPE, field); + field =3D FIELD_EX32(data, CPUCFG2, DIV32); + cpucfg =3D FIELD_DP32(cpucfg, CPUCFG2, DIV32, field); + field =3D FIELD_EX32(data, CPUCFG2, LAM_BH); + cpucfg =3D FIELD_DP32(cpucfg, CPUCFG2, LAM_BH, field); + field =3D FIELD_EX32(data, CPUCFG2, LAMCAS); + cpucfg =3D FIELD_DP32(cpucfg, CPUCFG2, LAMCAS, field); + field =3D FIELD_EX32(data, CPUCFG2, LLACQ_SCREL); + cpucfg =3D FIELD_DP32(cpucfg, CPUCFG2, LLACQ_SCREL, field); + field =3D FIELD_EX32(data, CPUCFG2, SCQ); + cpucfg =3D FIELD_DP32(cpucfg, CPUCFG2, SCQ, field); + cpu->env.cpucfg[2] =3D cpucfg; + + data =3D get_host_cpucfg(3); + cpucfg =3D cpu->env.cpucfg[3]; + field =3D FIELD_EX32(data, CPUCFG3, DBAR_HINTS); + cpucfg =3D FIELD_DP32(cpucfg, CPUCFG3, DBAR_HINTS, field); + field =3D FIELD_EX32(data, CPUCFG3, SLDORDER_STA); + cpucfg =3D FIELD_DP32(cpucfg, CPUCFG3, SLDORDER_STA, field); + cpu->env.cpucfg[3] =3D cpucfg; + cpuid =3D get_host_cpu_model(); if (cpuid) { cpu->env.cpu_id =3D cpuid; diff --git a/target/loongarch/cpu.h b/target/loongarch/cpu.h index a2613cecb7..7d0537a3c5 100644 --- a/target/loongarch/cpu.h +++ b/target/loongarch/cpu.h @@ -146,6 +146,12 @@ FIELD(CPUCFG2, LBT_ALL, 18, 3) FIELD(CPUCFG2, LSPW, 21, 1) FIELD(CPUCFG2, LAM, 22, 1) FIELD(CPUCFG2, HPTW, 24, 1) +FIELD(CPUCFG2, FRECIPE, 25, 1) +FIELD(CPUCFG2, DIV32, 26, 1) +FIELD(CPUCFG2, LAM_BH, 27, 1) +FIELD(CPUCFG2, LAMCAS, 28, 1) +FIELD(CPUCFG2, LLACQ_SCREL, 29, 1) +FIELD(CPUCFG2, SCQ, 30, 1) =20 /* cpucfg[3] bits */ FIELD(CPUCFG3, CCDMA, 0, 1) @@ -160,6 +166,8 @@ FIELD(CPUCFG3, SPW_LVL, 8, 3) FIELD(CPUCFG3, SPW_HP_HF, 11, 1) FIELD(CPUCFG3, RVA, 12, 1) FIELD(CPUCFG3, RVAMAX, 13, 4) +FIELD(CPUCFG3, DBAR_HINTS, 17, 1) +FIELD(CPUCFG3, SLDORDER_STA, 23, 1) =20 /* cpucfg[4] bits */ FIELD(CPUCFG4, CC_FREQ, 0, 32) --=20 2.39.3