From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751934AbdBAKIN (ORCPT ); Wed, 1 Feb 2017 05:08:13 -0500 Received: from foss.arm.com ([217.140.101.70]:56056 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751406AbdBAKIL (ORCPT ); Wed, 1 Feb 2017 05:08:11 -0500 Subject: Re: [RFC v2 05/10] KVM: arm/arm64: Initialize the emulated EL1 physical timer To: Christoffer Dall References: <1485479100-4966-1-git-send-email-jintack@cs.columbia.edu> <1485479100-4966-6-git-send-email-jintack@cs.columbia.edu> <86wpde83xn.fsf@arm.com> <20170130145816.GC16459@cbox> <57b57b31-b8ad-f5c8-a1fc-4cde9a564dd2@arm.com> <20170130190450.GF16459@cbox> Cc: Jintack Lim , pbonzini@redhat.com, rkrcmar@redhat.com, linux@armlinux.org.uk, catalin.marinas@arm.com, will.deacon@arm.com, andre.przywara@arm.com, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org, Peter Maydell From: Marc Zyngier Organization: ARM Ltd Message-ID: <619cc856-b268-df3b-d064-e511fa54afe0@arm.com> Date: Wed, 1 Feb 2017 10:08:01 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Icedove/45.5.1 MIME-Version: 1.0 In-Reply-To: <20170130190450.GF16459@cbox> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 30/01/17 19:04, Christoffer Dall wrote: > On Mon, Jan 30, 2017 at 05:44:20PM +0000, Marc Zyngier wrote: >> Wventually, we'll have to support an offset-able >> physical counter to support nested virtualization, but this can come at >> a later time. >> > Why do we need the offset-able physical counter for nested > virtualization? I would think for nested virt we just need to support > respecting how the guest hypervisor programs CNTVOFF? Ah, I see what you mean. Yes, once the guest hypervisor is in control of its own CNTVOFF, we get everything we need. So let's just ignore this for the time being, and we should be pretty good for this series. Thanks, M. -- Jazz is not dead. It just smells funny...