From nobody Sun Oct 5 10:51:12 2025 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 4ADC91B4231; Wed, 6 Aug 2025 09:00:49 +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=1754470854; cv=none; b=Dr1gyVAEwpW3igXa1Jg1y3eI8X0izI/HkUo58tBZz8huA61ffUaymeCKnivXqi+xBaYDoBQ8kRsv3oT4k2XtTMUv8VxAJdbRdEAuJ72KBoB/PIHSmUg+L1azB4beUgNkGafjLCaM2XZ/0Lua+01JHJ+CWRqthj+zHPDRI2tEEvg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754470854; c=relaxed/simple; bh=zR1tyOdyYA/M4ELpX0KfN8UVCXAxrOu08vQc349M9i4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=SyvXdTpmQ+JP+R1WXYXXdWLrQhNHMaZM+8osi2IAQZ+OjhNrs93R59F2BBvqiSBxCz+niK09mvfoh4Hw5KdMhuVbK10x7WyBAxiyu1ZRZEIVc1IJTeTcWBsQPVp3rMly2Xo8ft0AmSQz8wGghGHKqNebem4pxBo83COQHzB5MJc= 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 [10.2.5.213]) by gateway (Coremail) with SMTP id _____8DxDeO_GZNohZs5AQ--.12540S3; Wed, 06 Aug 2025 17:00:47 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.213]) by front1 (Coremail) with SMTP id qMiowJBxzsG+GZNoe6k4AA--.54411S3; Wed, 06 Aug 2025 17:00:47 +0800 (CST) From: Bibo Mao To: Tianrui Zhao , Huacai Chen , Xianglai Li Cc: kvm@vger.kernel.org, loongarch@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH v2 1/3] LoongArch: KVM: Access mailbox directly in mail_send() Date: Wed, 6 Aug 2025 17:00:44 +0800 Message-Id: <20250806090046.2028785-2-maobibo@loongson.cn> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20250806090046.2028785-1-maobibo@loongson.cn> References: <20250806090046.2028785-1-maobibo@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: qMiowJBxzsG+GZNoe6k4AA--.54411S3 X-CM-SenderInfo: xpdruxter6z05rqj20fqof0/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== Content-Type: text/plain; charset="utf-8" With function mail_send(), it is to write mailbox of other VCPUs. Existing simple APIs read_mailbox/write_mailbox can be used directly rather than send command on IOCSR address. Signed-off-by: Bibo Mao --- arch/loongarch/kvm/intc/ipi.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) diff --git a/arch/loongarch/kvm/intc/ipi.c b/arch/loongarch/kvm/intc/ipi.c index e658d5b37c04..6bbbf5df3957 100644 --- a/arch/loongarch/kvm/intc/ipi.c +++ b/arch/loongarch/kvm/intc/ipi.c @@ -134,7 +134,8 @@ static int send_ipi_data(struct kvm_vcpu *vcpu, gpa_t a= ddr, uint64_t data) =20 static int mail_send(struct kvm *kvm, uint64_t data) { - int cpu, mailbox, offset; + int i, cpu, mailbox, offset; + uint32_t val =3D 0, mask =3D 0; struct kvm_vcpu *vcpu; =20 cpu =3D ((data & 0xffffffff) >> 16) & 0x3ff; @@ -144,9 +145,18 @@ static int mail_send(struct kvm *kvm, uint64_t data) return -EINVAL; } mailbox =3D ((data & 0xffffffff) >> 2) & 0x7; - offset =3D IOCSR_IPI_BASE + IOCSR_IPI_BUF_20 + mailbox * 4; + offset =3D IOCSR_IPI_BUF_20 + mailbox * 4; + if ((data >> 27) & 0xf) { + val =3D read_mailbox(vcpu, offset, 4); + for (i =3D 0; i < 4; i++) + if (data & (BIT(27 + i))) + mask |=3D (0xff << (i * 8)); + val &=3D mask; + } =20 - return send_ipi_data(vcpu, offset, data); + val |=3D ((uint32_t)(data >> 32) & ~mask); + write_mailbox(vcpu, offset, val, 4); + return 0; } =20 static int any_send(struct kvm *kvm, uint64_t data) --=20 2.39.3