From nobody Wed Feb 11 04:00:43 2026 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id C7F1430FC0E; Thu, 18 Dec 2025 11:43:03 +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=1766058186; cv=none; b=K5ZrPV2Dl9Tz66txVbP5+qA7MxO8Pre4KvqIJ1nCpvqIIV7K3cFOctUc4iz1FLi3DgXtSMJpTiekv6Dy2DMIFwraBek1jvrChsW4r8z9zOd6u1ZL5FJ7s+7Ho+kjJhEQFzZS43dRE3vP/TLuX8hstikRRJwb460OxU9LoxDgn5o= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766058186; c=relaxed/simple; bh=9QyFcRZoxFWyf7EPiJgnXOZ1FZksLQqrTHbHvpRcKIY=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=RB7kKWstG1+iO/hCczfZP5FKTNuv3RcGF5X+AREMUgF19gzogVpSnI7iwpiO6FfPYsEM1wZRQob9iF5TvN0r9X157KL/gbVRCmgMvYhcS6chVLa+yTp/34mxsw96URrbzxMnYlzJASIqUHlfYslF+LKVa60IHiBsaMYrD+SRUKE= 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 _____8CxqsK96ENpa3QAAA--.1380S3; Thu, 18 Dec 2025 19:42:53 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.185]) by front1 (Coremail) with SMTP id qMiowJCx2+C56ENpqFABAA--.5610S5; 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 3/3] LongArch: KVM: Add dmsintc inject msi to the dest vcpu Date: Thu, 18 Dec 2025 19:18:22 +0800 Message-Id: <20251218111822.975455-4-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--.5610S5 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. Reviewed-by: Bibo Mao Signed-off-by: Song Gao --- arch/loongarch/include/asm/kvm_host.h | 5 +++ arch/loongarch/kvm/interrupt.c | 1 + arch/loongarch/kvm/vcpu.c | 58 +++++++++++++++++++++++++++ 3 files changed, 64 insertions(+) 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/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/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