From patchwork Thu Jul 20 06:28:05 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: zhaotianrui X-Patchwork-Id: 13319834 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 799BBEB64DA for ; Thu, 20 Jul 2023 06:30:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231172AbjGTGaJ (ORCPT ); Thu, 20 Jul 2023 02:30:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38418 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230088AbjGTG3g (ORCPT ); Thu, 20 Jul 2023 02:29:36 -0400 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 8FCB12711; Wed, 19 Jul 2023 23:28:31 -0700 (PDT) Received: from loongson.cn (unknown [10.2.5.185]) by gateway (Coremail) with SMTP id _____8Cx7+sF1Lhk1Y0HAA--.18444S3; Thu, 20 Jul 2023 14:28:21 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.185]) by localhost.localdomain (Coremail) with SMTP id AQAAf8CxvM7907hkHU81AA--.16059S24; Thu, 20 Jul 2023 14:28:21 +0800 (CST) From: Tianrui Zhao To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: Paolo Bonzini , Huacai Chen , WANG Xuerui , Greg Kroah-Hartman , loongarch@lists.linux.dev, Jens Axboe , Mark Brown , Alex Deucher , Oliver Upton , maobibo@loongson.cn, Xi Ruoyao , zhaotianrui@loongson.cn Subject: [PATCH v17 22/30] LoongArch: KVM: Implement handle idle exception Date: Thu, 20 Jul 2023 14:28:05 +0800 Message-Id: <20230720062813.4126751-23-zhaotianrui@loongson.cn> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230720062813.4126751-1-zhaotianrui@loongson.cn> References: <20230720062813.4126751-1-zhaotianrui@loongson.cn> MIME-Version: 1.0 X-CM-TRANSID: AQAAf8CxvM7907hkHU81AA--.16059S24 X-CM-SenderInfo: p2kd03xldq233l6o00pqjv00gofq/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Implement kvm handle LoongArch vcpu idle exception, using kvm_vcpu_block to emulate it. Reviewed-by: Bibo Mao Signed-off-by: Tianrui Zhao --- arch/loongarch/kvm/exit.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c index 32edd915ebcb..30748238c78c 100644 --- a/arch/loongarch/kvm/exit.c +++ b/arch/loongarch/kvm/exit.c @@ -188,3 +188,23 @@ int _kvm_complete_iocsr_read(struct kvm_vcpu *vcpu, struct kvm_run *run) return er; } + +int _kvm_emu_idle(struct kvm_vcpu *vcpu) +{ + ++vcpu->stat.idle_exits; + trace_kvm_exit_idle(vcpu, KVM_TRACE_EXIT_IDLE); + + if (!kvm_arch_vcpu_runnable(vcpu)) { + /* + * Switch to the software timer before halt-polling/blocking as + * the guest's timer may be a break event for the vCPU, and the + * hypervisor timer runs only when the CPU is in guest mode. + * Switch before halt-polling so that KVM recognizes an expired + * timer before blocking. + */ + kvm_save_timer(vcpu); + kvm_vcpu_block(vcpu); + } + + return EMULATE_DONE; +}