From patchwork Tue Feb 25 12:00:37 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: bibo mao X-Patchwork-Id: 13989904 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id BDA5EC021B2 for ; Tue, 25 Feb 2025 12:02:34 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1tmtcv-0003oH-Ex; Tue, 25 Feb 2025 07:01:29 -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 1tmtcN-0003iy-Io for qemu-devel@nongnu.org; Tue, 25 Feb 2025 07:00:55 -0500 Received: from mail.loongson.cn ([114.242.206.163]) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1tmtcI-0006Vn-HG for qemu-devel@nongnu.org; Tue, 25 Feb 2025 07:00:54 -0500 Received: from loongson.cn (unknown [10.2.5.213]) by gateway (Coremail) with SMTP id _____8Bx367vsL1nNhaCAA--.8741S3; Tue, 25 Feb 2025 20:00:47 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.213]) by front1 (Coremail) with SMTP id qMiowMBxLsfpsL1n2uMnAA--.19507S9; Tue, 25 Feb 2025 20:00:46 +0800 (CST) From: Bibo Mao To: Stefan Hajnoczi Cc: qemu-devel@nongnu.org, Song Gao Subject: [PULL 07/11] target/loongarch: Add paravirt ipi feature detection Date: Tue, 25 Feb 2025 20:00:37 +0800 Message-Id: <20250225120041.1652869-8-maobibo@loongson.cn> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20250225120041.1652869-1-maobibo@loongson.cn> References: <20250225120041.1652869-1-maobibo@loongson.cn> MIME-Version: 1.0 X-CM-TRANSID: qMiowMBxLsfpsL1n2uMnAA--.19507S9 X-CM-SenderInfo: xpdruxter6z05rqj20fqof0/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== 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_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Paravirt ipi feature is OnOffAuto type, feature detection is added to check whether it is supported by KVM host. Signed-off-by: Bibo Mao Reviewed-by: Bibo Mao --- target/loongarch/cpu.h | 2 ++ target/loongarch/kvm/kvm.c | 36 +++++++++++++++++++++++++++++++++++- 2 files changed, 37 insertions(+), 1 deletion(-) diff --git a/target/loongarch/cpu.h b/target/loongarch/cpu.h index 447192bfe0..3a8e45d9d5 100644 --- a/target/loongarch/cpu.h +++ b/target/loongarch/cpu.h @@ -287,6 +287,7 @@ enum loongarch_features { LOONGARCH_FEATURE_LASX, LOONGARCH_FEATURE_LBT, /* loongson binary translation extension */ LOONGARCH_FEATURE_PMU, + LOONGARCH_FEATURE_PV_IPI, }; typedef struct LoongArchBT { @@ -310,6 +311,7 @@ typedef struct CPUArchState { lbt_t lbt; uint32_t cpucfg[21]; + uint32_t pv_features; /* LoongArch CSRs */ uint64_t CSR_CRMD; diff --git a/target/loongarch/kvm/kvm.c b/target/loongarch/kvm/kvm.c index 83a6887fe8..3117441f53 100644 --- a/target/loongarch/kvm/kvm.c +++ b/target/loongarch/kvm/kvm.c @@ -8,7 +8,7 @@ #include "qemu/osdep.h" #include #include - +#include "asm-loongarch/kvm_para.h" #include "qapi/error.h" #include "qemu/timer.h" #include "qemu/error-report.h" @@ -882,6 +882,12 @@ static bool kvm_feature_supported(CPUState *cs, enum loongarch_features feature) ret = kvm_vm_ioctl(kvm_state, KVM_HAS_DEVICE_ATTR, &attr); return (ret == 0); + case LOONGARCH_FEATURE_PV_IPI: + attr.group = KVM_LOONGARCH_VM_FEAT_CTRL; + attr.attr = KVM_LOONGARCH_VM_FEAT_PV_IPI; + ret = kvm_vm_ioctl(kvm_state, KVM_HAS_DEVICE_ATTR, &attr); + return (ret == 0); + default: return false; } @@ -980,6 +986,29 @@ static int kvm_cpu_check_pmu(CPUState *cs, Error **errp) return 0; } +static int kvm_cpu_check_pv_features(CPUState *cs, Error **errp) +{ + LoongArchCPU *cpu = LOONGARCH_CPU(cs); + CPULoongArchState *env = cpu_env(cs); + bool kvm_supported; + + kvm_supported = kvm_feature_supported(cs, LOONGARCH_FEATURE_PV_IPI); + if (cpu->kvm_pv_ipi == ON_OFF_AUTO_ON) { + if (!kvm_supported) { + error_setg(errp, "'pv_ipi' feature not supported by KVM host"); + return -ENOTSUP; + } + } else if (cpu->kvm_pv_ipi != ON_OFF_AUTO_AUTO) { + kvm_supported = false; + } + + if (kvm_supported) { + env->pv_features |= BIT(KVM_FEATURE_IPI); + } + + return 0; +} + int kvm_arch_init_vcpu(CPUState *cs) { uint64_t val; @@ -1013,6 +1042,11 @@ int kvm_arch_init_vcpu(CPUState *cs) error_report_err(local_err); } + ret = kvm_cpu_check_pv_features(cs, &local_err); + if (ret < 0) { + error_report_err(local_err); + } + return ret; }