Received: by 2002:a05:6a10:8c0a:0:0:0:0 with SMTP id go10csp1208542pxb; Wed, 10 Feb 2021 02:55:09 -0800 (PST) X-Google-Smtp-Source: ABdhPJzLYBOm0DJErG7rp6NzHDrd/mJ4Cq/2AvIufAjE1L+C7ZxW3ZgFhbaZoRaVivqgyvQtlqS6 X-Received: by 2002:aa7:c716:: with SMTP id i22mr2518450edq.266.1612954509482; Wed, 10 Feb 2021 02:55:09 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1612954509; cv=none; d=google.com; s=arc-20160816; b=Yut6qh6qzq9HOCU4Pc11464DxB4IdtMQdUYkMHblX/TFPumYchC6WOTNwuMNL0TsqC fY0ltf5dMNQgWAq+NEmDj0kWEQheGMPo8b+24nUOqXLBHZJIgzpLTP5nq1FW9q/QHahX APnbPuCMdpwDCM66GuSeIzoa5sx0BOqrbabQaAo2SSU7yrQ0FfNiDFj1VxTUhiJZw4XW XsYxu/9FAngpQZIKw9GOiScf35XlBNL92CO0MqmRxruV/o6o4yQnVsOQsuioV2XcLlXE FidfW5BmF8DC6sjHj+UTjC3oh4GPmzTeFFKyInrh3eaMnSTNrBze51qhs4VzN+KMEHcO fiyg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:in-reply-to:content-disposition:mime-version :references:message-id:subject:cc:to:from:date:dkim-signature; bh=OwD8Y/StuwNVOHa1soFmlvIDY/cKdFgTspgSL38NrhQ=; b=Kd3Oo11QyhVmf/3D/CZZ4DCxuETvOk2hwXe7i7mU0Ah9l8/KhtC49VWYldXTqIVL1d UJi2RFwxYuJHoQZuQFBXS8qPFw8Vi+AoCK9uTuqtNDaqmKpO+pehRnc+qKvjwOGnLeaQ CropEeKMRCmw51BDaNpTr//tNpbUPt33JUeiozvgR8gPLwzcyqaaHOwftXvawYSQMKXC 4vd5Xj8ok4WooMW1/A9d7+Prt5gQTBqCp1b7zA5UE+MhYJJmGQsCi1+cl5EFvkl3S0jd 6zJZlJFX6T7j2dmhTDVfj87y97zDerD3zhG58E5D//M1l/XYrljE+bBTJrdF9lA2nxa4 P6XA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linuxfoundation.org header.s=korg header.b=x20QtPRk; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linuxfoundation.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id f23si1071272edj.313.2021.02.10.02.54.46; Wed, 10 Feb 2021 02:55:09 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@linuxfoundation.org header.s=korg header.b=x20QtPRk; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linuxfoundation.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231694AbhBJKw6 (ORCPT + 99 others); Wed, 10 Feb 2021 05:52:58 -0500 Received: from mail.kernel.org ([198.145.29.99]:51282 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229837AbhBJKtx (ORCPT ); Wed, 10 Feb 2021 05:49:53 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 98F9E64E38; Wed, 10 Feb 2021 10:49:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1612954152; bh=xuEAqpQCWZdM1vTZm9mWZOn0t6k7CNDtwTAtObZl4a4=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=x20QtPRkE+KSwll/FbCQT+SAWvi8RZFtX45ZSojCSCfOQr5WIMIJYfDmfWM9jaWh8 dNiS5dNi64k0ZtMCvUqa9j3ZfrpnuIbupsvtepiw+dY6Ne/uzwQmUJ7dPcARk5z/s7 7WaP/A93iteT3D0u4LBHKI8nQ5gV+OxcvnN+gDac= Date: Wed, 10 Feb 2021 11:49:09 +0100 From: Greg Kroah-Hartman To: Hikaru Nishida Cc: linux-kernel@vger.kernel.org, suleiman@google.com, Alexander Graf , Andra Paraschiv , Arnd Bergmann , Geert Uytterhoeven , Ingo Molnar , John Stultz , Kurt Kanzenbach , Linus Walleij , Masahiro Yamada , Stephen Boyd , Thomas Gleixner Subject: Re: [RFC PATCH 0/2] Introduce a way to adjust CLOCK_BOOTTIME from userspace for VM guests Message-ID: References: <20210210103908.1720658-1-hikalium@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210210103908.1720658-1-hikalium@google.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Feb 10, 2021 at 07:39:06PM +0900, Hikaru Nishida wrote: > From: Hikaru Nishida > > > Hi folks, > > We'd like to add a sysfs interface that enable us to advance > CLOCK_BOOTTIME from userspace. Why sysfs? What device is the clock that you are attaching to here? Why not use the existing kernel api to adjust clocks? thanks, greg k-h