From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A27D5C433FE for ; Fri, 8 Oct 2021 11:20:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 895B661039 for ; Fri, 8 Oct 2021 11:20:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240405AbhJHLVy (ORCPT ); Fri, 8 Oct 2021 07:21:54 -0400 Received: from mail.kernel.org ([198.145.29.99]:55112 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240374AbhJHLVx (ORCPT ); Fri, 8 Oct 2021 07:21:53 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 973A760F5B; Fri, 8 Oct 2021 11:19:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1633691998; bh=EsG1ef6GR6X+pt65HqJvECGs8yv4SUBeNoFGBIyukg8=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=Fdm9Y4i3UiEqQ0q8vB8fFguL9tfo7jIFd2R3JL9ef76f/bnmEz0AsVpz6I40Y13TD V6zD+blofHlgA5wxO6dsLiv7ZR26zJaFMjvLnLxA7Yfk6nHCuRJkiD/HkXf5zHkpTU aCa3+wiVVRJfYjo9x+4ycP5iqdN7Z0Xhiw8z2sFw= Date: Fri, 8 Oct 2021 13:19:53 +0200 From: Greg Kroah-Hartman To: Vitaly Kuznetsov Cc: Long Li , Bart Van Assche , "longli@linuxonhyperv.com" , "linux-block@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-hyperv@vger.kernel.org" , Jonathan Corbet , KY Srinivasan , Haiyang Zhang , Stephen Hemminger , Wei Liu , Dexuan Cui , Bjorn Andersson , Hans de Goede , "Williams, Dan J" , Maximilian Luz , Mike Rapoport , Ben Widawsky , Jiri Slaby , Andra Paraschiv , Siddharth Gupta , Hannes Reinecke Subject: Re: [Patch v5 0/3] Introduce a driver to support host accelerated access to Microsoft Azure Blob for Azure VM Message-ID: References: <87fstb3h6h.fsf@vitty.brq.redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87fstb3h6h.fsf@vitty.brq.redhat.com> Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On Fri, Oct 08, 2021 at 01:11:02PM +0200, Vitaly Kuznetsov wrote: > Greg Kroah-Hartman writes: > > ... > > > > Not to mention the whole crazy idea of "let's implement our REST api > > that used to go over a network connection over an ioctl instead!" > > That's the main problem that you need to push back on here. > > > > What is forcing you to put all of this into the kernel in the first > > place? What's wrong with the userspace network connection/protocol that > > you have today? > > > > Does this mean that we now have to implement all REST apis that people > > dream up as ioctl interfaces over a hyperv transport? That would be > > insane. > > As far as I understand, the purpose of the driver is to replace a "slow" > network connection to API endpoint with a "fast" transport over > Vmbus. Given that the network connection is already over vmbus, how is this "slow" today? I have yet to see any benchmark numbers anywhere :( > So what if instead of implementing this new driver we just use > Hyper-V Vsock and move API endpoint to the host? What is running on the host in the hypervisor that is supposed to be handling these requests? Isn't that really on some other guest? confused, greg k-h