From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A877563A9; Sun, 18 Feb 2024 07:10:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708240240; cv=none; b=oETqN752Qx/3X9WH0NCrX5IAmXSixh6R5+vi9HWV1PyOLDphZwnJyYt4YvYsiK6cFvkRZWdlBhi3wSVDt5jiMF9T2Aif9hHptud3lnJB0MuKDm3HnwvuwHBLShPV9ySFS8ed+ov9vicKJdGtvZvYWy3OHDcD6kVcQsOxqZ5UOME= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708240240; c=relaxed/simple; bh=pWHX0qRscK0ljYQPsse1crP4S3ZdIjMAi8v36Aoybgw=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=c4xTQjnKzqz/O16O+urULS2S4EQDm4+hfytTtZBRmgNHC9yFIQDqXUnoPDBNpjNWxgplsiGRy5qGi7iEcXYJPVjVczHbJ6OT0EhqmeKHP3S4OcgDwRSX3McAjkjukwPZKUgOdUvOKJDGBv5OVmnZJmCFbt5mHletJgtTsndYmvI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=sUx5icqP; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="sUx5icqP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8AC21C433F1; Sun, 18 Feb 2024 07:10:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1708240240; bh=pWHX0qRscK0ljYQPsse1crP4S3ZdIjMAi8v36Aoybgw=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=sUx5icqPsERr0lDEeZvN745PaNT58ZldbIYPZdUBsLOD/YmUVYKufgxKyOJd3Loxp xO4Fcp7+XJAM6nV1kSzAr3NBpJornLK0XfpIi6Z9C09c607CnNbu977gXigt/P8fq2 h8O/BxvhwEu5DxGLXuR3BB+J4qXBzGbuodSGorf4= Date: Sun, 18 Feb 2024 08:10:36 +0100 From: Greg KH To: Saurabh Sengar Cc: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, ssengar@microsoft.com Subject: Re: [PATCH 0/6] Low speed Hyper-V devices support Message-ID: <2024021812-shrouded-fanciness-06ec@gregkh> References: <1708193020-14740-1-git-send-email-ssengar@linux.microsoft.com> Precedence: bulk X-Mailing-List: linux-hyperv@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1708193020-14740-1-git-send-email-ssengar@linux.microsoft.com> On Sat, Feb 17, 2024 at 10:03:34AM -0800, Saurabh Sengar wrote: > Hyper-V is adding multiple low speed "speciality" synthetic devices. > Instead of writing a new kernel-level VMBus driver for each device, > make the devices accessible to user space through UIO-based > uio_hv_generic driver. Each device can then be supported by a user > space driver. This approach optimizes the development process and > provides flexibility to user space applications to control the key > interactions with the VMBus ring buffer. > > The new synthetic devices are low speed devices that don't support > VMBus monitor bits, and so they must use vmbus_setevent() to notify > the host of ring buffer updates. These new devices also have smaller > ring buffer sizes which requires to add support for variable ring buffer > sizes. > > Moreover, this patch series adds a new implementation of the fcopy > application that uses the new UIO driver. The older fcopy driver and > application will be phased out gradually. Development of other similar > userspace drivers is still underway. > > > Efforts have been made previously to implement this solution earlier. > Here are the discussions related to those attempts: > https://lore.kernel.org/lkml/1691132996-11706-1-git-send-email-ssengar@linux.microsoft.com/ > https://lore.kernel.org/lkml/1665575806-27990-1-git-send-email-ssengar@linux.microsoft.com/ > https://lore.kernel.org/lkml/1665685754-13971-1-git-send-email-ssengar@linux.microsoft.com/ So is this a v4 of the patch series? What has changed from those previous submissions? thanks, greg k-h