From nobody Fri Apr 4 06:23:02 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 1740367782859508.9326311736801; Sun, 23 Feb 2025 19:29:42 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1tmP8q-00016E-5X; Sun, 23 Feb 2025 22:28:24 -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 1tmP8g-00012T-4k for qemu-devel@nongnu.org; Sun, 23 Feb 2025 22:28:16 -0500 Received: from mail.loongson.cn ([114.242.206.163]) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1tmP8a-0004Vi-0c for qemu-devel@nongnu.org; Sun, 23 Feb 2025 22:28:12 -0500 Received: from loongson.cn (unknown [10.2.5.213]) by gateway (Coremail) with SMTP id _____8BxYa9B57tnN12AAA--.47618S3; Mon, 24 Feb 2025 11:28:01 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.213]) by front1 (Coremail) with SMTP id qMiowMDx_MQ857tnVqMlAA--.6451S9; Mon, 24 Feb 2025 11:28:01 +0800 (CST) From: Bibo Mao To: Song Gao Cc: qemu-devel@nongnu.org, lixianglai Subject: [PATCH v2 7/8] target/loongarch: Add kvm steal time feature detection Date: Mon, 24 Feb 2025 11:27:55 +0800 Message-Id: <20250224032756.809994-8-maobibo@loongson.cn> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20250224032756.809994-1-maobibo@loongson.cn> References: <20250224032756.809994-1-maobibo@loongson.cn> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: qMiowMDx_MQ857tnVqMlAA--.6451S9 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 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: 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: 1740367784575019000 Content-Type: text/plain; charset="utf-8" Paravirt steal time feature is OnOffAuto type, feature detection is added to check whether it is supported on KVM host. Signed-off-by: Bibo Mao --- target/loongarch/cpu.h | 1 + target/loongarch/kvm/kvm.c | 20 ++++++++++++++++++++ 2 files changed, 21 insertions(+) diff --git a/target/loongarch/cpu.h b/target/loongarch/cpu.h index 8ee320a720..3493b73e7a 100644 --- a/target/loongarch/cpu.h +++ b/target/loongarch/cpu.h @@ -288,6 +288,7 @@ enum loongarch_features { LOONGARCH_FEATURE_LBT, /* loongson binary translation extension */ LOONGARCH_FEATURE_PMU, LOONGARCH_FEATURE_PV_IPI, + LOONGARCH_FEATURE_STEALTIME, }; =20 typedef struct LoongArchBT { diff --git a/target/loongarch/kvm/kvm.c b/target/loongarch/kvm/kvm.c index f7e0ea5e40..13cdce5790 100644 --- a/target/loongarch/kvm/kvm.c +++ b/target/loongarch/kvm/kvm.c @@ -917,6 +917,12 @@ static bool kvm_feature_supported(CPUState *cs, enum l= oongarch_features feature) ret =3D kvm_vm_ioctl(kvm_state, KVM_HAS_DEVICE_ATTR, &attr); return (ret =3D=3D 0); =20 + case LOONGARCH_FEATURE_STEALTIME: + attr.group =3D KVM_LOONGARCH_VM_FEAT_CTRL; + attr.attr =3D KVM_LOONGARCH_VM_FEAT_PV_STEALTIME; + ret =3D kvm_vm_ioctl(kvm_state, KVM_HAS_DEVICE_ATTR, &attr); + return (ret =3D=3D 0); + default: return false; } @@ -1035,6 +1041,20 @@ static int kvm_cpu_check_pv_features(CPUState *cs, E= rror **errp) env->pv_features |=3D BIT(KVM_FEATURE_IPI); } =20 + kvm_supported =3D kvm_feature_supported(cs, LOONGARCH_FEATURE_STEALTIM= E); + if (cpu->kvm_steal_time =3D=3D ON_OFF_AUTO_ON) { + if (!kvm_supported) { + error_setg(errp, "'kvm stealtime' feature not supported by KVM= host"); + return -ENOTSUP; + } + } else if (cpu->kvm_steal_time !=3D ON_OFF_AUTO_AUTO) { + kvm_supported =3D false; + } + + if (kvm_supported) { + env->pv_features |=3D BIT(KVM_FEATURE_STEAL_TIME); + } + return 0; } =20 --=20 2.39.3