From patchwork Thu Aug 3 02:21:15 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: zhaotianrui X-Patchwork-Id: 13339143 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 C70BBC04A6A for ; Thu, 3 Aug 2023 02:22:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232691AbjHCCWh (ORCPT ); Wed, 2 Aug 2023 22:22:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44056 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232533AbjHCCWL (ORCPT ); Wed, 2 Aug 2023 22:22:11 -0400 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id E156A2701; Wed, 2 Aug 2023 19:21:54 -0700 (PDT) Received: from loongson.cn (unknown [10.2.5.185]) by gateway (Coremail) with SMTP id _____8BxIvBAD8tk5GgPAA--.35239S3; Thu, 03 Aug 2023 10:21:52 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.185]) by localhost.localdomain (Coremail) with SMTP id AQAAf8Cx_c4yD8tk8oNGAA--.51268S9; Thu, 03 Aug 2023 10:21:49 +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 v18 07/30] LoongArch: KVM: Implement vcpu run interface Date: Thu, 3 Aug 2023 10:21:15 +0800 Message-Id: <20230803022138.2736430-8-zhaotianrui@loongson.cn> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230803022138.2736430-1-zhaotianrui@loongson.cn> References: <20230803022138.2736430-1-zhaotianrui@loongson.cn> MIME-Version: 1.0 X-CM-TRANSID: AQAAf8Cx_c4yD8tk8oNGAA--.51268S9 X-CM-SenderInfo: p2kd03xldq233l6o00pqjv00gofq/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Implement vcpu run interface, handling mmio, iocsr reading fault and deliver interrupt, lose fpu before vcpu enter guest. Reviewed-by: Bibo Mao Signed-off-by: Tianrui Zhao --- arch/loongarch/kvm/vcpu.c | 79 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 79 insertions(+) diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c index e5b66aa82083..485998d20322 100644 --- a/arch/loongarch/kvm/vcpu.c +++ b/arch/loongarch/kvm/vcpu.c @@ -17,6 +17,41 @@ int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id) return 0; } +/* Returns 1 if the guest TLB may be clobbered */ +static int _kvm_check_requests(struct kvm_vcpu *vcpu) +{ + int ret = 0; + + if (!kvm_request_pending(vcpu)) + return 0; + + if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) { + /* Drop vpid for this vCPU */ + vcpu->arch.vpid = 0; + /* This will clobber guest TLB contents too */ + ret = 1; + } + + return ret; +} + +static void kvm_pre_enter_guest(struct kvm_vcpu *vcpu) +{ + /* + * handle vcpu timer, interrupts, check requests and + * check vmid before vcpu enter guest + */ + kvm_acquire_timer(vcpu); + _kvm_deliver_intr(vcpu); + /* make sure the vcpu mode has been written */ + smp_store_mb(vcpu->mode, IN_GUEST_MODE); + _kvm_check_requests(vcpu); + _kvm_check_vmid(vcpu); + vcpu->arch.host_eentry = csr_read64(LOONGARCH_CSR_EENTRY); + /* clear KVM_LARCH_CSR as csr will change when enter guest */ + vcpu->arch.aux_inuse &= ~KVM_LARCH_CSR; +} + int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu) { unsigned long timer_hz; @@ -84,3 +119,47 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) context->last_vcpu = NULL; } } + +int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu) +{ + int r = -EINTR; + struct kvm_run *run = vcpu->run; + + if (vcpu->mmio_needed) { + if (!vcpu->mmio_is_write) + _kvm_complete_mmio_read(vcpu, run); + vcpu->mmio_needed = 0; + } + + if (run->exit_reason == KVM_EXIT_LOONGARCH_IOCSR) { + if (!run->iocsr_io.is_write) + _kvm_complete_iocsr_read(vcpu, run); + } + + /* clear exit_reason */ + run->exit_reason = KVM_EXIT_UNKNOWN; + if (run->immediate_exit) + return r; + + vcpu_load(vcpu); + kvm_sigset_activate(vcpu); + lose_fpu(1); + + local_irq_disable(); + guest_timing_enter_irqoff(); + + kvm_pre_enter_guest(vcpu); + trace_kvm_enter(vcpu); + + guest_state_enter_irqoff(); + r = kvm_loongarch_ops->enter_guest(run, vcpu); + + /* guest_state_exit_irqoff() already done. */ + trace_kvm_out(vcpu); + guest_timing_exit_irqoff(); + local_irq_enable(); + + kvm_sigset_deactivate(vcpu); + vcpu_put(vcpu); + return r; +}