From nobody Thu Dec 18 20:03:08 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 02CECC77B61 for ; Thu, 27 Apr 2023 07:11:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243163AbjD0HLm (ORCPT ); Thu, 27 Apr 2023 03:11:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53572 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243083AbjD0HLR (ORCPT ); Thu, 27 Apr 2023 03:11:17 -0400 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id A79C946A1; Thu, 27 Apr 2023 00:11:15 -0700 (PDT) Received: from loongson.cn (unknown [10.2.5.185]) by gateway (Coremail) with SMTP id _____8AxHusSIEpk33MBAA--.2487S3; Thu, 27 Apr 2023 15:11:14 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.185]) by localhost.localdomain (Coremail) with SMTP id AQAAf8DxtrENIEpksEA+AA--.18906S10; Thu, 27 Apr 2023 15:11:13 +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: [PATCH v8 08/30] LoongArch: KVM: Implement vcpu handle exit interface Date: Thu, 27 Apr 2023 15:10:47 +0800 Message-Id: <20230427071109.3367258-9-zhaotianrui@loongson.cn> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20230427071109.3367258-1-zhaotianrui@loongson.cn> References: <20230427071109.3367258-1-zhaotianrui@loongson.cn> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: AQAAf8DxtrENIEpksEA+AA--.18906S10 X-CM-SenderInfo: p2kd03xldq233l6o00pqjv00gofq/ X-Coremail-Antispam: 1Uk129KBjvJXoW7WF17ArykWw17ZF48KFyxAFb_yoW8Cry7pr 4xCryY9w4rG34xJ39ayrs0qr4Yq3s7Kr17Zry3Xay2yFsFvas8Zr48KrZrtFy5Ww1FqF1f Xr1rG3WY9F4jywUanT9S1TB71UUUUbUqnTZGkaVYY2UrUUUUj1kv1TuYvTs0mT0YCTnIWj qI5I8CrVACY4xI64kE6c02F40Ex7xfYxn0WfASr-VFAUDa7-sFnT9fnUUIcSsGvfJTRUUU bx8Fc2x0x2IEx4CE42xK8VAvwI8IcIk0rVWrJVCq3wA2ocxC64kIII0Yj41l84x0c7CEw4 AK67xGY2AK021l84ACjcxK6xIIjxv20xvE14v26w1j6s0DM28EF7xvwVC0I7IYx2IY6xkF 7I0E14v26r4UJVWxJr1l84ACjcxK6I8E87Iv67AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aV CY1x0267AKxVW8Jr0_Cr1UM2kKe7AKxVWUAVWUtwAS0I0E0xvYzxvE52x082IY62kv0487 Mc804VCY07AIYIkI8VC2zVCFFI0UMc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VCjz48v1s IEY20_WwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lc7CjxVAaw2AFwI0_ Jw0_GFyl42xK82IYc2Ij64vIr41l42xK82IY6x8ErcxFaVAv8VWrMxC20s026xCaFVCjc4 AY6r1j6r4UMxCIbckI1I0E14v26r126r1DMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCj r7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF67AKxVWUtVW8ZwCIc40Y0x0EwIxGrwCI42IY6x IIjxv20xvE14v26w1j6s0DMIIF0xvE2Ix0cI8IcVCY1x0267AKxVW8Jr0_Cr1UMIIF0xvE 42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVWxJVW8Jr1lIxAIcVC2z280aV CY1x0267AKxVW8Jr0_Cr1UYxBIdaVFxhVjvjDU0xZFpf9x0zRfuc_UUUUU= 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 eca8b96a3e6e..ddea480fa5b0 100644 --- a/arch/loongarch/kvm/vcpu.c +++ b/arch/loongarch/kvm/vcpu.c @@ -55,6 +55,52 @@ 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