Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754148Ab3ILQHK (ORCPT ); Thu, 12 Sep 2013 12:07:10 -0400 Received: from mail-bk0-f44.google.com ([209.85.214.44]:36631 "EHLO mail-bk0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753594Ab3ILQHJ (ORCPT ); Thu, 12 Sep 2013 12:07:09 -0400 MIME-Version: 1.0 In-Reply-To: <20130912112452.GA22013@e106331-lin.cambridge.arm.com> References: <1378968687-8200-1-git-send-email-cinifr@gmail.com> <1378968687-8200-4-git-send-email-cinifr@gmail.com> <20130912112452.GA22013@e106331-lin.cambridge.arm.com> Date: Fri, 13 Sep 2013 00:07:07 +0800 Message-ID: Subject: Re: [PATCH 3/4] Add physical count arch timer support for clocksource in ARMv7. From: cinifr To: Mark Rutland Cc: "coosty@163.com" , "maxime.ripard@free-electrons.com" , "daniel.lezcano@linaro.org" , "linux@arm.linux.org.uk" , "tglx@linutronix.de" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "pawel.moll@arm.co" , "rob.herring@calxeda.com" , "linux-sunxi@googlegroups.com" , Marc Zyngier Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 982 Lines: 19 >This cannot be a compile-time option as above in a multiplatform build. >Other paltforms (e.g. KVM guests) *must* use the virtual counters to get >any semblance of a consistent view of time. Yes I accept compile-time option is not perfect in my pre email, But,Why Ohter paltforms *must* use the virtual counters? I think KVM should not limit how to use arch timer in its guest OS. Of cause, if KVM guest use vct can be more efficiency then that use pct. but KVM should and must support guest OS to access pct. >Why can the bootloader not be fixed to set CNTVOFF (or to boot the >kernel in Hyp mode)? I want kernel should try its best to boot and run with the bootloader not be fixed. BTW, I also hope all bootloader fix the problem. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/