From nobody Thu Dec 25 15:59:03 2025 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 1705308746843280.88514954681136; Mon, 15 Jan 2024 00:52:26 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rPIgw-0008VQ-Ag; Mon, 15 Jan 2024 03:51:34 -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 1rPIgu-0008VD-25 for qemu-devel@nongnu.org; Mon, 15 Jan 2024 03:51:32 -0500 Received: from mail.loongson.cn ([114.242.206.163]) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rPIgr-0007fb-EY for qemu-devel@nongnu.org; Mon, 15 Jan 2024 03:51:31 -0500 Received: from loongson.cn (unknown [10.2.5.213]) by gateway (Coremail) with SMTP id _____8CxrusJ8qRlPEoAAA--.1026S3; Mon, 15 Jan 2024 16:51:22 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.213]) by localhost.localdomain (Coremail) with SMTP id AQAAf8Cx_c4J8qRlLNkBAA--.9657S2; Mon, 15 Jan 2024 16:51:21 +0800 (CST) From: Bibo Mao To: Song Gao Cc: qemu-devel@nongnu.org Subject: [PATCH] target/loongarch: Set cpuid CSR register only once with kvm mode Date: Mon, 15 Jan 2024 16:51:21 +0800 Message-Id: <20240115085121.180524-1-maobibo@loongson.cn> X-Mailer: git-send-email 2.39.3 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: AQAAf8Cx_c4J8qRlLNkBAA--.9657S2 X-CM-SenderInfo: xpdruxter6z05rqj20fqof0/ X-Coremail-Antispam: 1Uk129KBj93XoW7Zw1fXw4kZrWUAFWkKr1Dtwc_yoW8WF15pr 9rCFZ8tF1rGaykAa4qv3sY9r15J3yIg397uFy2k34Ivrs0qrZ8XF48t3srtFy5K395Ar4F vF4xAw15ua1xJwcCm3ZEXasCq-sJn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7ZEXa sCq-sGcSsGvfJ3Ic02F40EFcxC0VAKzVAqx4xG6I80ebIjqfuFe4nvWSU5nxnvy29KBjDU 0xBIdaVrnRJUUUkFb4IE77IF4wAFF20E14v26r1j6r4UM7CY07I20VC2zVCF04k26cxKx2 IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48v e4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Jr0_JF4l84ACjcxK6xIIjxv20xvEc7CjxVAFwI 0_Jr0_Gr1l84ACjcxK6I8E87Iv67AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVCY1x0267AK xVW8Jr0_Cr1UM2AIxVAIcxkEcVAq07x20xvEncxIr21l57IF6xkI12xvs2x26I8E6xACxx 1l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv 67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41l42xK82IYc2 Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s02 6x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r1Y6r17MIIYrxkI7VAKI48JMIIF0x vE2Ix0cI8IcVAFwI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I0E14v26r1j6r4UMIIF0xvE 42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6x kF7I0E14v26r1j6r4UYxBIdaVFxhVjvjDU0xZFpf9x07UE-erUUUUU= 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, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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: 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: 1705308749581100003 Content-Type: text/plain; charset="utf-8" CSR cpuid register is used for routing irq to different vcpus, its value is kept unchanged since poweron. So it is not necessary to set CSR cpuid register after system resets, and it is only set at vm creation stage. Signed-off-by: Bibo Mao Reviewed-by: Song Gao --- target/loongarch/kvm/kvm.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/target/loongarch/kvm/kvm.c b/target/loongarch/kvm/kvm.c index 84bcdf5f86..2230f029d0 100644 --- a/target/loongarch/kvm/kvm.c +++ b/target/loongarch/kvm/kvm.c @@ -250,7 +250,7 @@ static int kvm_loongarch_get_csr(CPUState *cs) return ret; } =20 -static int kvm_loongarch_put_csr(CPUState *cs) +static int kvm_loongarch_put_csr(CPUState *cs, int level) { int ret =3D 0; LoongArchCPU *cpu =3D LOONGARCH_CPU(cs); @@ -322,8 +322,11 @@ static int kvm_loongarch_put_csr(CPUState *cs) ret |=3D kvm_set_one_reg(cs, KVM_IOC_CSRID(LOONGARCH_CSR_RVACFG), &env->CSR_RVACFG); =20 - ret |=3D kvm_set_one_reg(cs, KVM_IOC_CSRID(LOONGARCH_CSR_CPUID), + /* CPUID is constant after poweron, it should be set only once */ + if (level >=3D KVM_PUT_FULL_STATE) { + ret |=3D kvm_set_one_reg(cs, KVM_IOC_CSRID(LOONGARCH_CSR_CPUID), &env->CSR_CPUID); + } =20 ret |=3D kvm_set_one_reg(cs, KVM_IOC_CSRID(LOONGARCH_CSR_PRCFG1), &env->CSR_PRCFG1); @@ -598,7 +601,7 @@ int kvm_arch_put_registers(CPUState *cs, int level) return ret; } =20 - ret =3D kvm_loongarch_put_csr(cs); + ret =3D kvm_loongarch_put_csr(cs, level); if (ret) { return ret; } base-commit: 977542ded7e6b28d2bc077bcda24568c716e393c --=20 2.39.3