From nobody Thu Feb 12 06:43:15 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 D386FEEAA7F for ; Fri, 15 Sep 2023 01:50:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231534AbjIOBu3 (ORCPT ); Thu, 14 Sep 2023 21:50:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47614 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231397AbjIOBuI (ORCPT ); Thu, 14 Sep 2023 21:50:08 -0400 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 8223C2708; Thu, 14 Sep 2023 18:50:03 -0700 (PDT) Received: from loongson.cn (unknown [10.2.5.185]) by gateway (Coremail) with SMTP id _____8DxPOtGuANl5v4nAA--.6059S3; Fri, 15 Sep 2023 09:49:58 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.185]) by localhost.localdomain (Coremail) with SMTP id AQAAf8Axndw9uANl+ioGAA--.11927S14; Fri, 15 Sep 2023 09:49:57 +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 v21 12/29] LoongArch: KVM: Implement vcpu interrupt operations Date: Fri, 15 Sep 2023 09:49:32 +0800 Message-Id: <20230915014949.1222777-13-zhaotianrui@loongson.cn> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230915014949.1222777-1-zhaotianrui@loongson.cn> References: <20230915014949.1222777-1-zhaotianrui@loongson.cn> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: AQAAf8Axndw9uANl+ioGAA--.11927S14 X-CM-SenderInfo: p2kd03xldq233l6o00pqjv00gofq/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Implement vcpu interrupt operations such as vcpu set irq and vcpu clear irq, using set_gcsr_estat to set irq which is parsed by the irq bitmap. Reviewed-by: Bibo Mao Signed-off-by: Tianrui Zhao --- arch/loongarch/kvm/interrupt.c | 185 +++++++++++++++++++++++++++++++++ arch/loongarch/kvm/vcpu.c | 37 +++++++ 2 files changed, 222 insertions(+) create mode 100644 arch/loongarch/kvm/interrupt.c diff --git a/arch/loongarch/kvm/interrupt.c b/arch/loongarch/kvm/interrupt.c new file mode 100644 index 0000000000..9df75a564e --- /dev/null +++ b/arch/loongarch/kvm/interrupt.c @@ -0,0 +1,185 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2020-2023 Loongson Technology Corporation Limited + */ + +#include +#include +#include +#include + +static unsigned int int_to_coreint[EXCCODE_INT_NUM] =3D { + [INT_TI] =3D CPU_TIMER, + [INT_IPI] =3D CPU_IPI, + [INT_SWI0] =3D CPU_SIP0, + [INT_SWI1] =3D CPU_SIP1, + [INT_HWI0] =3D CPU_IP0, + [INT_HWI1] =3D CPU_IP1, + [INT_HWI2] =3D CPU_IP2, + [INT_HWI3] =3D CPU_IP3, + [INT_HWI4] =3D CPU_IP4, + [INT_HWI5] =3D CPU_IP5, + [INT_HWI6] =3D CPU_IP6, + [INT_HWI7] =3D CPU_IP7, +}; + +static int kvm_irq_deliver(struct kvm_vcpu *vcpu, unsigned int priority) +{ + unsigned int irq =3D 0; + + clear_bit(priority, &vcpu->arch.irq_pending); + if (priority < EXCCODE_INT_NUM) + irq =3D int_to_coreint[priority]; + + switch (priority) { + case INT_TI: + case INT_IPI: + case INT_SWI0: + case INT_SWI1: + set_gcsr_estat(irq); + break; + + case INT_HWI0 ... INT_HWI7: + set_csr_gintc(irq); + break; + + default: + break; + } + + return 1; +} + +static int kvm_irq_clear(struct kvm_vcpu *vcpu, unsigned int priority) +{ + unsigned int irq =3D 0; + + clear_bit(priority, &vcpu->arch.irq_clear); + if (priority < EXCCODE_INT_NUM) + irq =3D int_to_coreint[priority]; + + switch (priority) { + case INT_TI: + case INT_IPI: + case INT_SWI0: + case INT_SWI1: + clear_gcsr_estat(irq); + break; + + case INT_HWI0 ... INT_HWI7: + clear_csr_gintc(irq); + break; + + default: + break; + } + + return 1; +} + +void kvm_deliver_intr(struct kvm_vcpu *vcpu) +{ + unsigned long *pending =3D &vcpu->arch.irq_pending; + unsigned long *pending_clr =3D &vcpu->arch.irq_clear; + unsigned int priority; + + if (!(*pending) && !(*pending_clr)) + return; + + if (*pending_clr) { + priority =3D __ffs(*pending_clr); + while (priority <=3D INT_IPI) { + kvm_irq_clear(vcpu, priority); + priority =3D find_next_bit(pending_clr, + BITS_PER_BYTE * sizeof(*pending_clr), + priority + 1); + } + } + + if (*pending) { + priority =3D __ffs(*pending); + while (priority <=3D INT_IPI) { + kvm_irq_deliver(vcpu, priority); + priority =3D find_next_bit(pending, + BITS_PER_BYTE * sizeof(*pending), + priority + 1); + } + } +} + +int kvm_pending_timer(struct kvm_vcpu *vcpu) +{ + return test_bit(INT_TI, &vcpu->arch.irq_pending); +} + +/* + * Only support illegal instruction or illegal Address Error exception, + * Other exceptions are injected by hardware in kvm mode + */ +static void kvm_exception_deliver(struct kvm_vcpu *vcpu, unsigned int code, + unsigned int subcode) +{ + unsigned long val, vec_size; + + /* + * BADV is added for EXCCODE_ADE exception + * Use pc register (gva address) if it is instruction exeception + * Else use badv from host side (gpa address) for data exeception + */ + if (code =3D=3D EXCCODE_ADE) { + if (subcode =3D=3D EXSUBCODE_ADEF) + val =3D vcpu->arch.pc; + else + val =3D vcpu->arch.badv; + kvm_write_hw_gcsr(LOONGARCH_CSR_BADV, val); + } + + /* set exception instruction */ + kvm_write_hw_gcsr(LOONGARCH_CSR_BADI, vcpu->arch.badi); + + /* + * save crmd in prmd + * set IRQ disabled and PLV0 with crmd + */ + val =3D kvm_read_hw_gcsr(LOONGARCH_CSR_CRMD); + kvm_write_hw_gcsr(LOONGARCH_CSR_PRMD, val); + val =3D val & ~(CSR_CRMD_PLV | CSR_CRMD_IE); + kvm_write_hw_gcsr(LOONGARCH_CSR_CRMD, val); + + /* set exception pc address */ + kvm_write_hw_gcsr(LOONGARCH_CSR_ERA, vcpu->arch.pc); + + /* + * set exception code + * exception and interrupt can be inject at the same time + * hardware will handle exception first and then extern interrupt + * exception code is Ecode in ESTAT[16:21] + * interrupt code in ESTAT[0:12] + */ + val =3D kvm_read_hw_gcsr(LOONGARCH_CSR_ESTAT); + val =3D (val & ~CSR_ESTAT_EXC) | code; + kvm_write_hw_gcsr(LOONGARCH_CSR_ESTAT, val); + + /* + * calculate expcetion entry address + */ + val =3D kvm_read_hw_gcsr(LOONGARCH_CSR_ECFG); + vec_size =3D (val & CSR_ECFG_VS) >> CSR_ECFG_VS_SHIFT; + if (vec_size) + vec_size =3D (1 << vec_size) * 4; + val =3D kvm_read_hw_gcsr(LOONGARCH_CSR_EENTRY); + vcpu->arch.pc =3D val + code * vec_size; +} + +void kvm_deliver_exception(struct kvm_vcpu *vcpu) +{ + unsigned long *pending =3D &vcpu->arch.exception_pending; + unsigned int code; + + if (*pending) { + code =3D __ffs(*pending); + kvm_exception_deliver(vcpu, code, vcpu->arch.subcode); + *pending =3D 0; + vcpu->arch.subcode =3D 0; + } +} diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c index b8af4a200c..191d9f5517 100644 --- a/arch/loongarch/kvm/vcpu.c +++ b/arch/loongarch/kvm/vcpu.c @@ -336,6 +336,43 @@ void kvm_lose_fpu(struct kvm_vcpu *vcpu) preempt_enable(); } =20 +int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *= irq) +{ + int intr =3D (int)irq->irq; + + if (intr > 0) + kvm_queue_irq(vcpu, intr); + else if (intr < 0) + kvm_dequeue_irq(vcpu, -intr); + else { + kvm_err("%s: invalid interrupt ioctl %d\n", __func__, irq->irq); + return -EINVAL; + } + + kvm_vcpu_kick(vcpu); + return 0; +} + +long kvm_arch_vcpu_async_ioctl(struct file *filp, + unsigned int ioctl, unsigned long arg) +{ + struct kvm_vcpu *vcpu =3D filp->private_data; + void __user *argp =3D (void __user *)arg; + + if (ioctl =3D=3D KVM_INTERRUPT) { + struct kvm_interrupt irq; + + if (copy_from_user(&irq, argp, sizeof(irq))) + return -EFAULT; + + kvm_debug("[%d] %s: irq: %d\n", vcpu->vcpu_id, __func__, irq.irq); + + return kvm_vcpu_ioctl_interrupt(vcpu, &irq); + } + + return -ENOIOCTLCMD; +} + int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id) { return 0; --=20 2.39.1