From patchwork Thu Aug 3 02:21:16 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: zhaotianrui X-Patchwork-Id: 13339144 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 1B2BCC001DF for ; Thu, 3 Aug 2023 02:22:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232124AbjHCCWk (ORCPT ); Wed, 2 Aug 2023 22:22:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44044 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232717AbjHCCW1 (ORCPT ); Wed, 2 Aug 2023 22:22:27 -0400 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 7A5472D43; Wed, 2 Aug 2023 19:21:56 -0700 (PDT) Received: from loongson.cn (unknown [10.2.5.185]) by gateway (Coremail) with SMTP id _____8BxbOpBD8tk8GgPAA--.8732S3; Thu, 03 Aug 2023 10:21:53 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.185]) by localhost.localdomain (Coremail) with SMTP id AQAAf8Cx_c4yD8tk8oNGAA--.51268S10; Thu, 03 Aug 2023 10:21:50 +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 08/30] LoongArch: KVM: Implement vcpu handle exit interface Date: Thu, 3 Aug 2023 10:21:16 +0800 Message-Id: <20230803022138.2736430-9-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--.51268S10 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 handle exit interface, getting the exit code by ESTAT register and using kvm exception vector to handle it. Reviewed-by: Bibo Mao Signed-off-by: Tianrui Zhao --- arch/loongarch/kvm/vcpu.c | 45 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c index 485998d20322..a862b5ac15a0 100644 --- a/arch/loongarch/kvm/vcpu.c +++ b/arch/loongarch/kvm/vcpu.c @@ -52,6 +52,51 @@ static void kvm_pre_enter_guest(struct kvm_vcpu *vcpu) vcpu->arch.aux_inuse &= ~KVM_LARCH_CSR; } +/* + * Return 1 for resume guest and "<= 0" for resume host. + */ +static int _kvm_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu) +{ + unsigned long exst = vcpu->arch.host_estat; + u32 intr = exst & 0x1fff; /* ignore NMI */ + u32 exccode = (exst & CSR_ESTAT_EXC) >> CSR_ESTAT_EXC_SHIFT; + int ret = RESUME_GUEST; + + vcpu->mode = OUTSIDE_GUEST_MODE; + + /* Set a default exit reason */ + run->exit_reason = KVM_EXIT_UNKNOWN; + + local_irq_enable(); + guest_state_exit_irqoff(); + + trace_kvm_exit(vcpu, exccode); + if (exccode) { + ret = _kvm_handle_fault(vcpu, exccode); + } else { + WARN(!intr, "vm exiting with suspicious irq\n"); + ++vcpu->stat.int_exits; + } + + cond_resched(); + local_irq_disable(); + + if (ret == RESUME_HOST) + return ret; + + /* Only check for signals if not already exiting to userspace */ + if (signal_pending(current)) { + vcpu->run->exit_reason = KVM_EXIT_INTR; + ++vcpu->stat.signal_exits; + return -EINTR; + } + + kvm_pre_enter_guest(vcpu); + trace_kvm_reenter(vcpu); + guest_state_enter_irqoff(); + return RESUME_GUEST; +} + int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu) { unsigned long timer_hz;