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=-4.0 required=3.0 tests=BAYES_00,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_NONE 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 5FB70C2D0D4 for ; Wed, 12 May 2021 17:41:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2E2BA61412 for ; Wed, 12 May 2021 17:41:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235762AbhELRm6 (ORCPT ); Wed, 12 May 2021 13:42:58 -0400 Received: from mail.kernel.org ([198.145.29.99]:43882 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244894AbhELQvX (ORCPT ); Wed, 12 May 2021 12:51:23 -0400 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 090DA61176; Wed, 12 May 2021 16:33:04 +0000 (UTC) Received: from 78.163-31-62.static.virginmediabusiness.co.uk ([62.31.163.78] helo=why.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1lgrnB-000yJZ-OO; Wed, 12 May 2021 17:33:01 +0100 Date: Wed, 12 May 2021 17:33:01 +0100 Message-ID: <87im3noqte.wl-maz@kernel.org> From: Marc Zyngier To: Alexandru Elisei Cc: linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, James Morse , Suzuki K Poulose , Eric Auger , Hector Martin , Mark Rutland , kernel-team@android.com Subject: Re: [PATCH v3 0/9] KVM: arm64: Initial host support for the Apple M1 In-Reply-To: <3a21048a-a084-a884-7a3d-9b283f8b15ed@arm.com> References: <20210510134824.1910399-1-maz@kernel.org> <3a21048a-a084-a884-7a3d-9b283f8b15ed@arm.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/27.1 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: alexandru.elisei@arm.com, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, james.morse@arm.com, suzuki.poulose@arm.com, eric.auger@redhat.com, marcan@marcan.st, mark.rutland@arm.com, kernel-team@android.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Hi Alex, On Wed, 12 May 2021 17:22:43 +0100, Alexandru Elisei wrote: > > Hi Marc, > > On 5/10/21 2:48 PM, Marc Zyngier wrote: > > This is a new version of the series previously posted at [2], reworking > > the vGIC and timer code to cope with the M1 braindead^Wamusing nature. > > > > Hardly any change this time around, mostly rebased on top of upstream > > now that the dependencies have made it in. > > > > Tested with multiple concurrent VMs running from an initramfs. > > > > * From v2: > > - Rebased on 5.13-rc1 > > - Fixed a couple of nits in the GIC registration code > > > > * From v1 [1]: > > - Rebased on Hector's v4 posting[0] > > - Dropped a couple of patches that have been merged in the above series > > - Fixed irq_ack callback on the timer path > > > > [0] https://lore.kernel.org/r/20210402090542.131194-1-marcan@marcan.st > > [1] https://lore.kernel.org/r/20210316174617.173033-1-maz@kernel.org > > [2] https://lore.kernel.org/r/20210403112931.1043452-1-maz@kernel.org > > This looks interesting and I want to take a look. For now, I can > only review the series, but maybe at some point I'll take the leap > and try to run Linux on my Macbook Air. It is a bit involved at the moment, and I haven't tried on a laptop (the nice thing about the Mini is that you can bury it under a pile of other machines and still make use of it). > Can I find something resembling a specification for the Apple > interrupt controller, or the only available documentation is in the > Linux driver and patches on the mailing list? The Asahi wiki has a bunch of RE goodies, but you really don't need to know much about the HW to follow what this series does. Actually, you instead need to understand what the GIC guarantees to the guest, because this is all about the GIC emulation on a non-GIC interrupt controller. Thanks, M. -- Without deviation from the norm, progress is not possible.