From nobody Tue Feb 10 23:33:26 2026 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 0B4ECC77B62 for ; Tue, 28 Mar 2023 12:31:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232761AbjC1Mb5 (ORCPT ); Tue, 28 Mar 2023 08:31:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34936 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232120AbjC1Mbi (ORCPT ); Tue, 28 Mar 2023 08:31:38 -0400 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 5215C9ED5; Tue, 28 Mar 2023 05:31:23 -0700 (PDT) Received: from loongson.cn (unknown [10.2.5.185]) by gateway (Coremail) with SMTP id _____8AxUU8a3iJk7RgTAA--.17733S3; Tue, 28 Mar 2023 20:31:22 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.185]) by localhost.localdomain (Coremail) with SMTP id AQAAf8CxPL4X3iJku2cPAA--.12046S10; Tue, 28 Mar 2023 20:31:21 +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 , zhaotianrui@loongson.cn Subject: [PING PATCH v4 08/29] LoongArch: KVM: Implement vcpu handle exit interface Date: Tue, 28 Mar 2023 20:30:58 +0800 Message-Id: <20230328123119.3649361-9-zhaotianrui@loongson.cn> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20230328123119.3649361-1-zhaotianrui@loongson.cn> References: <20230328123119.3649361-1-zhaotianrui@loongson.cn> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: AQAAf8CxPL4X3iJku2cPAA--.12046S10 X-CM-SenderInfo: p2kd03xldq233l6o00pqjv00gofq/ X-Coremail-Antispam: 1Uk129KBjvJXoW7WF17ArW5CFyrCF15uw17Jrb_yoW8Cr4Dpr 4xCr1Ygw4rG34xJ3sayrs0qr4Yq3s7Kr17ZrZxX3y2yFsFvas0qr48KrZFyFyrWw1FqF1f Xr1rG3Z09F4jywUanT9S1TB71UUUUj7qnTZGkaVYY2UrUUUUj1kv1TuYvTs0mT0YCTnIWj qI5I8CrVACY4xI64kE6c02F40Ex7xfYxn0WfASr-VFAUDa7-sFnT9fnUUIcSsGvfJTRUUU b48Fc2x0x2IEx4CE42xK8VAvwI8IcIk0rVWrJVCq3wA2ocxC64kIII0Yj41l84x0c7CEw4 AK67xGY2AK021l84ACjcxK6xIIjxv20xvE14v26w1j6s0DM28EF7xvwVC0I7IYx2IY6xkF 7I0E14v26r4UJVWxJr1l84ACjcxK6I8E87Iv67AKxVWxJr0_GcWl84ACjcxK6I8E87Iv6x kF7I0E14v26F4UJVW0owAaw2AFwI0_JF0_Jw1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAq jxCEc2xF0cIa020Ex4CE44I27wAqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx0E74AGY7Cv6c x26rWlOx8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI48JMxkF7I0En4kS14v26r12 6r1DMxAIw28IcxkI7VAKI48JMxAIw28IcVCjz48v1sIEY20_WwCFx2IqxVCFs4IE7xkEbV WUJVW8JwCFI7km07C267AKxVWUAVWUtwC20s026c02F40E14v26r1j6r18MI8I3I0E7480 Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_Jw0_GFylIxkGc2Ij64vIr41lIxAIcVC0I7 IYx2IY67AKxVW7JVWDJwCI42IY6xIIjxv20xvEc7CjxVAFwI0_Cr0_Gr1UMIIF0xvE42xK 8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVWxJVW8Jr1lIxAIcVC2z280aVCY1x 0267AKxVW8JVW8JrUvcSsGvfC2KfnxnUUI43ZEXa7xRiTKZJUUUUU== 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 bc9e3889f..651ae5ca0 100644 --- a/arch/loongarch/kvm/vcpu.c +++ b/arch/loongarch/kvm/vcpu.c @@ -56,6 +56,52 @@ static void kvm_pre_enter_guest(struct kvm_vcpu *vcpu) vcpu->arch.aux_inuse &=3D ~KVM_LARCH_CSR; } =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