From nobody Tue Sep 9 21:33:55 2025 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 AB24BC64ED6 for ; Tue, 28 Feb 2023 07:01:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230332AbjB1HB3 (ORCPT ); Tue, 28 Feb 2023 02:01:29 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47784 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229800AbjB1HBE (ORCPT ); Tue, 28 Feb 2023 02:01:04 -0500 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id CA9DDFF06; Mon, 27 Feb 2023 23:01:01 -0800 (PST) Received: from loongson.cn (unknown [10.2.5.185]) by gateway (Coremail) with SMTP id _____8DxAf+spv1jbmAGAA--.6583S3; Tue, 28 Feb 2023 15:01:00 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.185]) by localhost.localdomain (Coremail) with SMTP id AQAAf8Bxc+Wppv1jPG9AAA--.15462S10; Tue, 28 Feb 2023 15:01:00 +0800 (CST) From: Tianrui Zhao To: Paolo Bonzini Cc: Huacai Chen , WANG Xuerui , Greg Kroah-Hartman , loongarch@lists.linux.dev, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Jens Axboe , Mark Brown , Alex Deucher , Oliver Upton , maobibo@loongson.cn, Xi Ruoyao Subject: [PATCH v3 08/29] LoongArch: KVM: Implement vcpu handle exit interface Date: Tue, 28 Feb 2023 15:00:35 +0800 Message-Id: <20230228070057.3687180-9-zhaotianrui@loongson.cn> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20230228070057.3687180-1-zhaotianrui@loongson.cn> References: <20230228070057.3687180-1-zhaotianrui@loongson.cn> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: AQAAf8Bxc+Wppv1jPG9AAA--.15462S10 X-CM-SenderInfo: p2kd03xldq233l6o00pqjv00gofq/ X-Coremail-Antispam: 1Uk129KBjvJXoW7WF17ArW7XFyfGry7XrW7XFb_yoW8CF1rpF 4kCr90gr4rG34xJwnayr4qqr4Yq3s7Kr17ZrZrX3y2yFsFvas8Xr4kKrZrtFyrWw1FqF1f Xr1rG3WY9F4jywUanT9S1TB71UUUUjJqnTZGkaVYY2UrUUUUj1kv1TuYvTs0mT0YCTnIWj qI5I8CrVACY4xI64kE6c02F40Ex7xfYxn0WfASr-VFAUDa7-sFnT9fnUUIcSsGvfJTRUUU b4kFc2x0x2IEx4CE42xK8VAvwI8IcIk0rVWrJVCq3wA2ocxC64kIII0Yj41l84x0c7CEw4 AK67xGY2AK021l84ACjcxK6xIIjxv20xvE14v26w1j6s0DM28EF7xvwVC0I7IYx2IY6xkF 7I0E14v26r4UJVWxJr1l84ACjcxK6I8E87Iv67AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aV CY1x0267AKxVW8Jr0_Cr1UM2kKe7AKxVWUAVWUtwAS0I0E0xvYzxvE52x082IY62kv0487 Mc804VCY07AIYIkI8VC2zVCFFI0UMc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VCjz48v1s IEY20_WwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lc7CjxVAaw2AFwI0_ JF0_Jw1l42xK82IYc2Ij64vIr41l42xK82IY6x8ErcxFaVAv8VWrMxC20s026xCaFVCjc4 AY6r1j6r4UMxCIbckI1I0E14v26r126r1DMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCj r7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF67AKxVWUtVW8ZwCIc40Y0x0EwIxGrwCI42IY6x IIjxv20xvE14v26w1j6s0DMIIF0xvE2Ix0cI8IcVCY1x0267AKxVWxJVW8Jr1lIxAIcVCF 04k26cxKx2IYs7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26F4j6r4UJwCI42IY6I8E87Iv6x kF7I0E14v26r4j6r4UJbIYCTnIWIevJa73UjIFyTuYvj4RKpBTUUUUU Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Implement vcpu handle exit interface, getting the exit code by ESTAT register and using kvm exception vector to handle it. Signed-off-by: Tianrui Zhao --- arch/loongarch/kvm/vcpu.c | 46 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c index 4fcfb36a7133..e16b7ca852e3 100644 --- a/arch/loongarch/kvm/vcpu.c +++ b/arch/loongarch/kvm/vcpu.c @@ -54,6 +54,52 @@ static void kvm_pre_enter_guest(struct kvm_vcpu *vcpu) vcpu->arch.host_eentry =3D csr_read64(LOONGARCH_CSR_EENTRY); } =20 +/* + * Return 1 for resume guest and "<=3D 0" for resume host. + */ +static int _kvm_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu) +{ + unsigned long exst =3D vcpu->arch.host_estat; + u32 intr =3D exst & 0x1fff; /* ignore NMI */ + u32 exccode =3D (exst & CSR_ESTAT_EXC) >> CSR_ESTAT_EXC_SHIFT; + int ret =3D RESUME_GUEST; + + vcpu->mode =3D OUTSIDE_GUEST_MODE; + + /* Set a default exit reason */ + run->exit_reason =3D KVM_EXIT_UNKNOWN; + run->ready_for_interrupt_injection =3D 1; + + local_irq_enable(); + guest_state_exit_irqoff(); + + trace_kvm_exit(vcpu, exccode); + if (exccode) { + ret =3D _kvm_handle_fault(vcpu, exccode); + } else { + WARN(!intr, "suspicious vm exiting"); + ++vcpu->stat.int_exits; + } + + cond_resched(); + local_irq_disable(); + + if (ret =3D=3D RESUME_HOST) + return ret; + + /* Only check for signals if not already exiting to userspace */ + if (signal_pending(current)) { + vcpu->run->exit_reason =3D 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; --=20 2.31.1