From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 AA4D53EC69C for ; Fri, 17 Jul 2026 13:43:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784295815; cv=none; b=fcSzB4V1vtyFI1/YnImVv+D/T5Og6g8oT44EHxYr3wnXg3LayKB9Wg0rVq4N2BORxzemkOjGRxuxDNVmWblsiKCjIpFcGtmQAhC8/f3QiDOpgRYcC6GiigZQsETP0/M+NM6wkYOHmXLxOuybGj8yQJY++/pKDK+wrEnpAgWG+qI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784295815; c=relaxed/simple; bh=FAmJuHahiejagr6+wXaFvcTxhIg8e8YhOVHwtAhPQ4Q=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=LPsIKXSXic6qkf0cuGp+haQu10I8K2gcNBO5wsSHGjzcOM1QhfR8tFIG4jzAByNdBNDcYZdbEcGHan2z61GGkv8NwnB0R0aDcGlff1RwqruDTomjEI0Mo5MqEeV5nRaRBkJ3HFCInF/SNrRR0IxK6Mt959QyN03qE7AjiZKsnrI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=JSqneFMO; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="JSqneFMO" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B0B9E1F00A3A; Fri, 17 Jul 2026 13:43:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784295814; bh=bCre0Kd1lsHRj/9VKXLhWA83bxjXO0IwCziIyuhjSls=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=JSqneFMOpyFvMGMENnjVHiz40ROd938NPVODdvaHGqaAMzK1Wi4jq8J9iCrcCW4Fi gJFVkE9BahseLOPCTPUrDt3WeNiGZRXui8Yn4qryllXjPQMeEho75MZzyVHGmT63YV L6cviVBiFk8IQUR2cixd1TsZWoaSMuvIns/QpkKI= Date: Fri, 17 Jul 2026 15:43:26 +0200 From: Greg KH To: Rishi Chhibber Cc: arnd@arndb.de, linux-kernel@vger.kernel.org, ajay.kaher@broadcom.com, alexey.makhalov@broadcom.com, vamsi-krishna.brahmajosyula@broadcom.com, yin.ding@broadcom.com, tapas.kundu@broadcom.com Subject: Re: [PATCH v2] misc: vmw_zerocopy: Add VMware zero-copy buffer sharing driver Message-ID: <2026071738-upwind-decaf-98fd@gregkh> References: <20260617203125.397427-1-rishi.chhibber@broadcom.com> <20260618181034.1483738-1-rishi.chhibber@broadcom.com> Precedence: bulk X-Mailing-List: linux-kernel@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: <20260618181034.1483738-1-rishi.chhibber@broadcom.com> On Thu, Jun 18, 2026 at 11:10:34AM -0700, Rishi Chhibber wrote: > This driver implements a misc character device (/dev/vmw_zc) that allows > guest userspace applications to share pinned memory buffers with a > VMware hypervisor-side peer using the VMCI datagram interface. > > The driver pins user pages via get_user_pages_fast(), transmits their > physical page frame numbers to the hypervisor peer over VMCI, and avoids > an intermediate copy between the guest workload VM and the hypervisor. > > The hypervisor-side peer for this interface only speaks VMCI; there is no > virtio backend implemented on the VMware host for it. Wait, we need to modify Linux because vmware doesn't want to implement an industry standard api? That doesn't feel very nice, or fair, here. Why have a standard if no one uses it? Please push back and just modify vmware instead. thanks, greg k-h