From nobody Tue Feb 10 06:27:30 2026 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 7469531AA86; Thu, 18 Dec 2025 11:43:02 +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=1766058184; cv=none; b=OG4DLNdC38Ec7dDbIvnAnrjp/8m1qtJANbM1CJ3+wvHCMRHIeHUSMgLpojFKH/Wc9h8LRsZjMCmbKSUz8QhbXa2aL8xmxCAfrLpLe3rvn5jpCMcGMl3N/alJWR8qMgifLXMQXRA5BiVBj8L+mtNhAROYnP/BYimzfEQ12shR7LE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766058184; c=relaxed/simple; bh=Ox30KXodUkBQZM4ADTFG2Sa0nEW2eIGMkgfy6aKBS5o=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=AWEyXU4pgBYQoDzyN9HD+qtUAwmhuZ/x03t3lCtsGEv6Hfj7ry/tvvKVx9pmRjtX3rvdJwCSTsIFtOXZWpRL/vOu2MHPWS56B/SMMvWT8MYbEyoWZM7372fvwyPrPZaiZxtp3de5+ySPK4HKbWQYnx0hFIu1Um2N7SXMPASCwig= 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 _____8BxWcK86ENpZ3QAAA--.1317S3; Thu, 18 Dec 2025 19:42:52 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.185]) by front1 (Coremail) with SMTP id qMiowJCx2+C56ENpqFABAA--.5610S4; Thu, 18 Dec 2025 19:42:52 +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 v4 2/3] LongArch: KVM: Add irqfd set dmsintc msg irq Date: Thu, 18 Dec 2025 19:18:21 +0800 Message-Id: <20251218111822.975455-3-gaosong@loongson.cn> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20251218111822.975455-1-gaosong@loongson.cn> References: <20251218111822.975455-1-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: qMiowJCx2+C56ENpqFABAA--.5610S4 X-CM-SenderInfo: 5jdr20tqj6z05rqj20fqof0/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== Content-Type: text/plain; charset="utf-8" Add irqfd choice dmsintc to set msi irq by the msg_addr and implement dmsintc set msi irq. Reviewed-by: Bibo Mao Signed-off-by: Song Gao --- arch/loongarch/include/asm/kvm_dmsintc.h | 1 + arch/loongarch/kvm/intc/dmsintc.c | 6 ++++ arch/loongarch/kvm/irqfd.c | 45 ++++++++++++++++++++---- 3 files changed, 45 insertions(+), 7 deletions(-) diff --git a/arch/loongarch/include/asm/kvm_dmsintc.h b/arch/loongarch/incl= ude/asm/kvm_dmsintc.h index 1d4f66996f3c..9b5436a2fcbe 100644 --- a/arch/loongarch/include/asm/kvm_dmsintc.h +++ b/arch/loongarch/include/asm/kvm_dmsintc.h @@ -11,6 +11,7 @@ struct loongarch_dmsintc { struct kvm *kvm; uint64_t msg_addr_base; uint64_t msg_addr_size; + uint32_t cpu_mask; }; =20 struct dmsintc_state { diff --git a/arch/loongarch/kvm/intc/dmsintc.c b/arch/loongarch/kvm/intc/dm= sintc.c index 3fdea81a08c8..9ecb2e3e352d 100644 --- a/arch/loongarch/kvm/intc/dmsintc.c +++ b/arch/loongarch/kvm/intc/dmsintc.c @@ -15,6 +15,7 @@ static int kvm_dmsintc_ctrl_access(struct kvm_device *dev, void __user *data; struct loongarch_dmsintc *s =3D dev->kvm->arch.dmsintc; u64 tmp; + u32 cpu_bit; =20 data =3D (void __user *)attr->addr; switch (addr) { @@ -30,6 +31,11 @@ static int kvm_dmsintc_ctrl_access(struct kvm_device *de= v, s->msg_addr_base =3D tmp; else return -EFAULT; + s->msg_addr_base =3D tmp; + cpu_bit =3D find_first_bit((unsigned long *)&(s->msg_addr_base), 64) + - AVEC_CPU_SHIFT; + cpu_bit =3D min(cpu_bit, AVEC_CPU_BIT); + s->cpu_mask =3D GENMASK(cpu_bit - 1, 0) & AVEC_CPU_MASK; } break; case KVM_DEV_LOONGARCH_DMSINTC_MSG_ADDR_SIZE: diff --git a/arch/loongarch/kvm/irqfd.c b/arch/loongarch/kvm/irqfd.c index 9a39627aecf0..11f980474552 100644 --- a/arch/loongarch/kvm/irqfd.c +++ b/arch/loongarch/kvm/irqfd.c @@ -6,6 +6,7 @@ #include #include #include +#include =20 static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm, int irq_source_id, int level, bool line_status) @@ -16,6 +17,41 @@ static int kvm_set_pic_irq(struct kvm_kernel_irq_routing= _entry *e, return 0; } =20 +static int kvm_dmsintc_set_msi_irq(struct kvm *kvm, u32 addr, int data, in= t level) +{ + unsigned int virq, dest; + struct kvm_vcpu *vcpu; + + virq =3D (addr >> AVEC_IRQ_SHIFT) & AVEC_IRQ_MASK; + dest =3D (addr >> AVEC_CPU_SHIFT) & kvm->arch.dmsintc->cpu_mask; + if (dest > KVM_MAX_VCPUS) + return -EINVAL; + vcpu =3D kvm_get_vcpu_by_cpuid(kvm, dest); + if (!vcpu) + return -EINVAL; + return kvm_loongarch_deliver_msi_to_vcpu(kvm, vcpu, virq, level); +} + +static int loongarch_set_msi(struct kvm_kernel_irq_routing_entry *e, + struct kvm *kvm, int level) +{ + u64 msg_addr; + + if (!level) + return -1; + + msg_addr =3D (((u64)e->msi.address_hi) << 32) | e->msi.address_lo; + if (cpu_has_msgint && kvm->arch.dmsintc && + msg_addr >=3D kvm->arch.dmsintc->msg_addr_base && + msg_addr < (kvm->arch.dmsintc->msg_addr_base + kvm->arch.dmsintc->msg_a= ddr_size)) { + return kvm_dmsintc_set_msi_irq(kvm, msg_addr, e->msi.data, level); + } else { + pch_msi_set_irq(kvm, e->msi.data, level); + } + + return 0; +} + /* * kvm_set_msi: inject the MSI corresponding to the * MSI routing entry @@ -26,12 +62,7 @@ static int kvm_set_pic_irq(struct kvm_kernel_irq_routing= _entry *e, int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm, int irq_source_id, int level, bool line_status) { - if (!level) - return -1; - - pch_msi_set_irq(kvm, e->msi.data, level); - - return 0; + return loongarch_set_msi(e, kvm, level); } =20 /* @@ -76,7 +107,7 @@ int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_rout= ing_entry *e, pch_pic_set_irq(kvm->arch.pch_pic, e->irqchip.pin, level); return 0; case KVM_IRQ_ROUTING_MSI: - pch_msi_set_irq(kvm, e->msi.data, level); + loongarch_set_msi(e, kvm, level); return 0; default: return -EWOULDBLOCK; --=20 2.39.3