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 X-Spam-Level: X-Spam-Status: No, score=-1.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D3BF0CA9EB5 for ; Mon, 21 Oct 2019 07:56:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A70FC20830 for ; Mon, 21 Oct 2019 07:56:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1571644563; bh=+XQE8A9wIYwpjV4Pzh2sw12sAoRdjp0Ts3qMw90uZvk=; h=To:Subject:Date:From:Cc:In-Reply-To:References:List-ID:From; b=hovezHvakqOP13Xx8lUNwvzPPTnyUJoGx7r1MNgVOjvgcsdIZ79h8oUtVuHSx5fwV T1bjcunk8xsVhXk0NNppvq5OY2tIgyYZZPbSnQsCN+OBc5UBwUM5VQJHpAkAyO1ygz Q7xWNiCjvKEI9jYBYb07xDhGzPqYGfF2v7K8K6n8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727601AbfJUH4C (ORCPT ); Mon, 21 Oct 2019 03:56:02 -0400 Received: from inca-roads.misterjones.org ([213.251.177.50]:47068 "EHLO inca-roads.misterjones.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727047AbfJUH4B (ORCPT ); Mon, 21 Oct 2019 03:56:01 -0400 Received: from www-data by cheepnis.misterjones.org with local (Exim 4.80) (envelope-from ) id 1iMSXe-0007gc-Fy; Mon, 21 Oct 2019 09:55:50 +0200 To: =?UTF-8?Q?J=C3=BCrgen_Gro=C3=9F?= Subject: Re: [PATCH v6 10/10] arm64: Retrieve stolen time as paravirtualized guest X-PHP-Originating-Script: 0:main.inc MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Date: Mon, 21 Oct 2019 08:55:50 +0100 From: Marc Zyngier Cc: Steven Price , Will Deacon , , , Catalin Marinas , Paolo Bonzini , =?UTF-8?Q?Radim_Kr=C4=8Dm=C3=A1=C5=99?= , Russell King , James Morse , Julien Thierry , Suzuki K Pouloze , Mark Rutland , , , In-Reply-To: <237a3457-bcb3-c9b7-11ef-241b7ccc370e@suse.com> References: <20191011125930.40834-1-steven.price@arm.com> <20191011125930.40834-11-steven.price@arm.com> <86a79wzdhk.wl-maz@kernel.org> <237a3457-bcb3-c9b7-11ef-241b7ccc370e@suse.com> Message-ID: X-Sender: maz@kernel.org User-Agent: Roundcube Webmail/0.7.2 X-SA-Exim-Connect-IP: X-SA-Exim-Rcpt-To: jgross@suse.com, steven.price@arm.com, will@kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, catalin.marinas@arm.com, pbonzini@redhat.com, rkrcmar@redhat.com, linux@armlinux.org.uk, james.morse@arm.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com, mark.rutland@arm.com, kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on cheepnis.misterjones.org); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2019-10-21 06:01, Jürgen Groß wrote: > On 19.10.19 22:28, Marc Zyngier wrote: >> How about something like pv_time_init() instead? In the guest, this >> is >> no way KVM specific, and I still hope for this to work on things >> like >> Xen/HyperV/VMware (yeah, I'm foolishly optimistic). All the >> references >> to KVM should go, and be replaced by something more generic (after >> all, you're only implementing the spec, so feel free to call it >> den0057_* if you really want). > > Xen guests already have the needed functionality. On ARM this just > needs > to be hooked up. Yes, Xen offers its own PV interface for that. But this code is about implementing support for a cross hypervisor functionnality (which AFAICT is not implemented by Xen). M. -- Jazz is not dead. It just smells funny...