From nobody Sat Feb 7 21:11:52 2026 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 4CEC32F12C9; Tue, 23 Dec 2025 23:09:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=13.77.154.182 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766531368; cv=none; b=L7d2Ck5Z7H6E8UdtLbykNWfdZguRMR3/E/NpA6yerF/DD8tcJiBsV5vVeVjlqdZTJ+qEtACLIdgABk/Hx1JjS2LGHpP7cY25O7iJSizniC0XUx87Kezx3uMcLDSK828xZozv/69o1L3vEAcnMPloEs2WO+5m6g/CicsSkbtBoT0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766531368; c=relaxed/simple; bh=sAwwy2sio6lkc47FDsReM8SoyBwcC4MIdfRDutt5yKw=; h=Message-ID:Date:MIME-Version:Subject:From:To:Cc:References: In-Reply-To:Content-Type; b=RHYMImCGobNis2Pegz2LLkEabB9xvLD9m3bex+wKsR8OtipMPy0y3AtKlo/2/T9dpm5AkFRFcSM8tIb2wowbh31ceZBdKN5cm96XfnMkisHfbJRsPaCAqfuHOlE5l5FaUwsEfIAn4LkvMJ8giu/8rRFxMifDZcuCJBeCGS5sHXQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com; spf=pass smtp.mailfrom=linux.microsoft.com; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b=llDbrej8; arc=none smtp.client-ip=13.77.154.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="llDbrej8" Received: from [100.65.0.124] (unknown [20.236.11.102]) by linux.microsoft.com (Postfix) with ESMTPSA id 4D2A1212A423; Tue, 23 Dec 2025 15:09:26 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 4D2A1212A423 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1766531366; bh=sAwwy2sio6lkc47FDsReM8SoyBwcC4MIdfRDutt5yKw=; h=Date:Subject:From:To:Cc:References:In-Reply-To:From; b=llDbrej8RnKs7HiCXtYol6Xr74gRhUTQrEcaA/KKSG+N+Sh20qp6TGcYvt3bBlCN2 0wCGNwfDaGB/0eCKtBuNaBLT8jlI36puukcIoq/Um4aRmh5Ai88d/bRPQST+bVbl1Z i6H3r7qWW4HPJOlfCXGHrhiVESPFH+bwwaFodIEc= Message-ID: <10482c90-50c8-4e72-ba40-1d0e6e722128@linux.microsoft.com> Date: Tue, 23 Dec 2025 15:09:24 -0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: [PATCH v5 2/2] Drivers: hv: vmbus: retrieve connection-id from DeviceTree From: Hardik Garg To: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, krzk+dt@kernel.org, robh@kernel.org, conor+dt@kernel.org, mhklinux@outlook.com Cc: devicetree@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, ssengar@linux.microsoft.com, longli@microsoft.com, Naman Jain , hargar@microsoft.com References: <58cb22cb-b0c8-4694-b9e4-971aa7f0f972@linux.microsoft.com> Content-Language: en-US In-Reply-To: <58cb22cb-b0c8-4694-b9e4-971aa7f0f972@linux.microsoft.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable The connection-id determines which hypervisor communication channel the guest should use to talk to the VMBus host. Add steps to read this value from the DeviceTree. When this property is not present, the driver selects the connection ID based on the protocol version (4 for VERSION_WIN10_V5 and newer, or 1 for older versions). Signed-off-by: Hardik Garg --- v4: https://lore.kernel.org/all/1750374395-14615-3-git-send-email-hargar@linux.= microsoft.com v3: https://lore.kernel.org/all/6a92ca86-ad6b-4d49-af6e-1ed7651b8ab8@linux.micr= osoft.com v2: https://lore.kernel.org/all/096edaf7-cc90-42b6-aff4-c5f088574e1e@linux.micr= osoft.com v1: https://lore.kernel.org/all/6acee4bf-cb04-43b9-9476-e8d811d26dfd@linux.micr= osoft.com --- =C2=A0drivers/hv/connection.c |=C2=A0 7 +++++-- =C2=A0drivers/hv/vmbus_drv.c=C2=A0 |=C2=A0 8 ++++++++ =C2=A02 files changed, 13 insertions(+), 2 deletions(-) diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c index 5d9cb5bf2d62..660cad3886f5 100644 --- a/drivers/hv/connection.c +++ b/drivers/hv/connection.c @@ -100,12 +100,15 @@ int vmbus_negotiate_version(struct vmbus_channel_msginfo *msginfo, u32 version) =C2=A0 =C2=A0 =C2=A0if (version >=3D VERSION_WIN10_V5) { =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0msg->msg_sint =3D VMBUS_MESSAGE_SINT; =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0msg->msg_vtl =3D ms_hyperv.vtl; -=C2=A0 =C2=A0 =C2=A0 =C2=A0 vmbus_connection.msg_conn_id =3D VMBUS_MESSAGE= _CONNECTION_ID_4; =C2=A0 =C2=A0 =C2=A0} else { =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0msg->interrupt_page =3D virt_to_phys(vmbu= s_connection.int_page); -=C2=A0 =C2=A0 =C2=A0 =C2=A0 vmbus_connection.msg_conn_id =3D VMBUS_MESSAGE= _CONNECTION_ID; =C2=A0 =C2=A0 =C2=A0} =C2=A0 +=C2=A0 =C2=A0 /* Set default connection ID if not provided via DeviceTree = */ +=C2=A0 =C2=A0 if (!vmbus_connection.msg_conn_id) +=C2=A0 =C2=A0 =C2=A0 =C2=A0 vmbus_connection.msg_conn_id =3D (version >=3D= VERSION_WIN10_V5) ? +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 VMBUS_MESSAGE_CONNECTION_ID_4 : = VMBUS_MESSAGE_CONNECTION_ID; + =C2=A0 =C2=A0 =C2=A0if (vmbus_is_confidential() && version >=3D VERSION_WIN= 10_V6_0) =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0msg->feature_flags =3D VMBUS_FEATURE_FLAG= _CONFIDENTIAL_CHANNELS; =C2=A0 diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index 47fcab38398a..f8c0594ab85f 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -2600,10 +2600,18 @@ static int vmbus_device_add(struct platform_device *pdev) =C2=A0 =C2=A0 =C2=A0struct of_range range; =C2=A0 =C2=A0 =C2=A0struct of_range_parser parser; =C2=A0 =C2=A0 =C2=A0struct device_node *np =3D pdev->dev.of_node; +=C2=A0 =C2=A0unsigned int conn_id; =C2=A0 =C2=A0 =C2=A0int ret; =C2=A0 =C2=A0 =C2=A0 =C2=A0vmbus_root_device =3D &pdev->dev; =C2=A0 +=C2=A0 =C2=A0 /* Read connection ID from DeviceTree */ +=C2=A0 =C2=A0 if (!of_property_read_u32(np, "microsoft,message-connection-= id", +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 &conn_id)) { +=C2=A0 =C2=A0 =C2=A0 =C2=A0 pr_info("VMBus message connection ID: %u\n", c= onn_id); +=C2=A0 =C2=A0 =C2=A0 =C2=A0 vmbus_connection.msg_conn_id =3D conn_id; +=C2=A0 =C2=A0 } + =C2=A0 =C2=A0 =C2=A0ret =3D of_range_parser_init(&parser, np); =C2=A0 =C2=A0 =C2=A0if (ret) =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0return ret; --=C2=A0 2.34.1