From nobody Mon Dec 1 22:38:18 2025 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 51F29306492; Fri, 28 Nov 2025 09:36:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=114.242.206.163 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764322567; cv=none; b=s/uWXsKT0HxIh/9gEFvJYrIxSWsIFu9M+BtR5l21y+4MCtinWjRo66NvBgrtEeNN5rk2hPGG5KpVyVUl6uZqT1X17sZTS+3bVcEfsemmUxFxMNkGWvMfT8kYcn3hsboXFnlDvsPwEKFSaYG6nvELluYAYYl2pxtI2aE5J4cnnXE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764322567; c=relaxed/simple; bh=LmrQReRHSxozkSK9E2ysPud58TfdTnGKefR7tZggujU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Q9HJGcAS+Irv7Rpnx2GSrsIgiLcC+9ow7d1r8RBDYQTNSr6xiAb82dXtenSexYqArJKIXPafuLLx+XhoohqpwMhE4zkhF4HklL6B3alFPqmgI6Et5ytfhugffTKByAJA/dgKBNGrkyd4qT/JkipoMWGijM9ZkTCz8yqu0FRHtAU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn; spf=pass smtp.mailfrom=loongson.cn; arc=none smtp.client-ip=114.242.206.163 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=loongson.cn Received: from loongson.cn (unknown [10.2.5.185]) by gateway (Coremail) with SMTP id _____8CxrtPwbClpTA8pAA--.18072S3; Fri, 28 Nov 2025 17:35:44 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.185]) by front1 (Coremail) with SMTP id qMiowJCx2sDtbClpo+xBAQ--.23356S6; Fri, 28 Nov 2025 17:35:43 +0800 (CST) From: Song Gao To: maobibo@loongson.cn, chenhuacai@kernel.org Cc: kvm@vger.kernel.org, loongarch@lists.linux.dev, kernel@xen0n.name, linux-kernel@vger.kernel.org Subject: [PATCH v2 4/4] LongArch: KVM: Add dintc inject msi to the dest vcpu Date: Fri, 28 Nov 2025 17:11:25 +0800 Message-Id: <20251128091125.2720148-5-gaosong@loongson.cn> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20251128091125.2720148-1-gaosong@loongson.cn> References: <20251128091125.2720148-1-gaosong@loongson.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: qMiowJCx2sDtbClpo+xBAQ--.23356S6 X-CM-SenderInfo: 5jdr20tqj6z05rqj20fqof0/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== Content-Type: text/plain; charset="utf-8" Implement irqfd deliver msi to vcpu and vcpu dintc inject irq. Signed-off-by: Song Gao --- arch/loongarch/include/asm/kvm_host.h | 5 +++ arch/loongarch/kvm/interrupt.c | 1 + arch/loongarch/kvm/vcpu.c | 55 +++++++++++++++++++++++++++ 3 files changed, 61 insertions(+) diff --git a/arch/loongarch/include/asm/kvm_host.h b/arch/loongarch/include= /asm/kvm_host.h index 7f6c4e7d241e..298e4b7c3769 100644 --- a/arch/loongarch/include/asm/kvm_host.h +++ b/arch/loongarch/include/asm/kvm_host.h @@ -256,6 +256,11 @@ struct kvm_vcpu_arch { } st; }; =20 +void loongarch_dintc_inject_irq(struct kvm_vcpu *vcpu); +int kvm_loongarch_deliver_msi_to_vcpu(struct kvm *kvm, + struct kvm_vcpu *vcpu, + u32 vector, int level); + static inline unsigned long readl_sw_gcsr(struct loongarch_csrs *csr, int = reg) { return csr->csrs[reg]; diff --git a/arch/loongarch/kvm/interrupt.c b/arch/loongarch/kvm/interrupt.c index a6d42d399a59..c74e7af3e772 100644 --- a/arch/loongarch/kvm/interrupt.c +++ b/arch/loongarch/kvm/interrupt.c @@ -33,6 +33,7 @@ static int kvm_irq_deliver(struct kvm_vcpu *vcpu, unsigne= d int priority) irq =3D priority_to_irq[priority]; =20 if (cpu_has_msgint && (priority =3D=3D INT_AVEC)) { + loongarch_dintc_inject_irq(vcpu); set_gcsr_estat(irq); return 1; } diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c index 1e7590fc1b47..84cf8b7c67dd 100644 --- a/arch/loongarch/kvm/vcpu.c +++ b/arch/loongarch/kvm/vcpu.c @@ -13,6 +13,61 @@ #define CREATE_TRACE_POINTS #include "trace.h" =20 +void loongarch_dintc_inject_irq(struct kvm_vcpu *vcpu) +{ + struct dintc_state *ds =3D &vcpu->arch.dintc_state; + unsigned int i; + unsigned long temp[4], old; + + if (!ds) + return; + + for (i =3D 0; i < 4; i++) { + old =3D atomic64_read(&(ds->vector_map[i])); + if (old) + temp[i] =3D atomic64_xchg(&(ds->vector_map[i]), 0); + } + + if (temp[0]) { + old =3D kvm_read_hw_gcsr(LOONGARCH_CSR_ISR0); + kvm_write_hw_gcsr(LOONGARCH_CSR_ISR0, temp[0]|old); + } + if (temp[1]) { + old =3D kvm_read_hw_gcsr(LOONGARCH_CSR_ISR1); + kvm_write_hw_gcsr(LOONGARCH_CSR_ISR1, temp[1]|old); + } + if (temp[2]) { + old =3D kvm_read_hw_gcsr(LOONGARCH_CSR_ISR2); + kvm_write_hw_gcsr(LOONGARCH_CSR_ISR2, temp[2]|old); + } + if (temp[3]) { + old =3D kvm_read_hw_gcsr(LOONGARCH_CSR_ISR3); + kvm_write_hw_gcsr(LOONGARCH_CSR_ISR3, temp[3]|old); + } +} + +int kvm_loongarch_deliver_msi_to_vcpu(struct kvm *kvm, + struct kvm_vcpu *vcpu, + u32 vector, int level) +{ + struct kvm_interrupt vcpu_irq; + struct dintc_state *ds; + + if (!level) + return 0; + if (!vcpu || vector >=3D 256) + return -EINVAL; + ds =3D &vcpu->arch.dintc_state; + if (!ds) + return -ENODEV; + set_bit(vector, (unsigned long *)&ds->vector_map); + vcpu_irq.irq =3D INT_AVEC; + kvm_vcpu_ioctl_interrupt(vcpu, &vcpu_irq); + kvm_vcpu_kick(vcpu); + return 0; +} + + const struct _kvm_stats_desc kvm_vcpu_stats_desc[] =3D { KVM_GENERIC_VCPU_STATS(), STATS_DESC_COUNTER(VCPU, int_exits), --=20 2.39.3