From nobody Tue Feb 10 11:32:56 2026 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 56B59314A7D; Thu, 25 Dec 2025 09:37:05 +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=1766655429; cv=none; b=FUNQjJ6I8HAoSS340V/WI5Qmek4hYRwRDYq8cHOjVHOP7KTWlrmxVn/dxES8oeP1/inCmaaptprFcTcQlMGA22x3nhjLLgpYh/OTwvuXcUsSuPQh/auwErwYqeK6tUk8P8UkFYLoAlsEO/db43mBmfWgDvRhViY1WfOZBGu7gow= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766655429; c=relaxed/simple; bh=9htsw+Ldh0tUhKhhlg467QyeZM/gjVsTjsVYCpzZmYU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=eq4mTHLciQ6DI6LfTwlPxpvCRkOuEZ/QQf8UQi6NsNRg+Lj3AdPOZqUD8YwA9o00Dg6GNL9o7cXMkBG+xGXPT/8PSUQSmFJjMsnenNWu5Fo+yq3jvx2GlNlM/LA2fMbm4MNGC0Ku+hBnRh1ez9RNZ4n4NZ3GBMRuUBT6j5oe5pw= 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 _____8AxjsO_BU1ppRoDAA--.10484S3; Thu, 25 Dec 2025 17:37:03 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.185]) by front1 (Coremail) with SMTP id qMiowJAx38K4BU1p0rEEAA--.13879S4; Thu, 25 Dec 2025 17:37:02 +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 v5 2/2] LongArch: KVM: Add dmsintc inject msi to the dest vcpu Date: Thu, 25 Dec 2025 17:12:24 +0800 Message-Id: <20251225091224.2893389-3-gaosong@loongson.cn> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20251225091224.2893389-1-gaosong@loongson.cn> References: <20251225091224.2893389-1-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: qMiowJAx38K4BU1p0rEEAA--.13879S4 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 dmsintc inject irq. Add irqfd choice dmsintc to set msi irq by the msg_addr and implement dmsintc set msi irq. Signed-off-by: Song Gao --- arch/loongarch/include/asm/kvm_dmsintc.h | 1 + arch/loongarch/include/asm/kvm_host.h | 5 ++ arch/loongarch/kvm/intc/dmsintc.c | 6 +++ arch/loongarch/kvm/interrupt.c | 1 + arch/loongarch/kvm/irqfd.c | 42 +++++++++++++++-- arch/loongarch/kvm/vcpu.c | 58 ++++++++++++++++++++++++ 6 files changed, 109 insertions(+), 4 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/include/asm/kvm_host.h b/arch/loongarch/include= /asm/kvm_host.h index 5e9e2af7312f..91e0190aeaec 100644 --- a/arch/loongarch/include/asm/kvm_host.h +++ b/arch/loongarch/include/asm/kvm_host.h @@ -258,6 +258,11 @@ struct kvm_vcpu_arch { } st; }; =20 +void loongarch_dmsintc_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/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/interrupt.c b/arch/loongarch/kvm/interrupt.c index a6d42d399a59..893a81ca1079 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_dmsintc_inject_irq(vcpu); set_gcsr_estat(irq); return 1; } diff --git a/arch/loongarch/kvm/irqfd.c b/arch/loongarch/kvm/irqfd.c index 9a39627aecf0..3bbb26f4e2b7 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 +17,38 @@ 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; + + 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 @@ -29,9 +62,7 @@ int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, if (!level) return -1; =20 - pch_msi_set_irq(kvm, e->msi.data, level); - - return 0; + return loongarch_set_msi(e, kvm, level); } =20 /* @@ -71,12 +102,15 @@ int kvm_set_routing_entry(struct kvm *kvm, int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm, int irq_source_id, int level, bool line_status) { + if (!level) + return -EWOULDBLOCK; + switch (e->type) { case KVM_IRQ_ROUTING_IRQCHIP: 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; diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c index 656b954c1134..325bb084d704 100644 --- a/arch/loongarch/kvm/vcpu.c +++ b/arch/loongarch/kvm/vcpu.c @@ -14,6 +14,64 @@ #define CREATE_TRACE_POINTS #include "trace.h" =20 +void loongarch_dmsintc_inject_irq(struct kvm_vcpu *vcpu) +{ + struct dmsintc_state *ds =3D &vcpu->arch.dmsintc_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 dmsintc_state *ds; + + if (!level) + return 0; + if (!vcpu || vector >=3D 256) + return -EINVAL; + ds =3D &vcpu->arch.dmsintc_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