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 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 26190106703B for ; Thu, 12 Mar 2026 14:36:54 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1w0h9Q-0002ly-VJ; Thu, 12 Mar 2026 10:36:37 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1w0h9P-0002l6-2B; Thu, 12 Mar 2026 10:36:35 -0400 Received: from frasgout.his.huawei.com ([185.176.79.56]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1w0h9L-0004vt-J8; Thu, 12 Mar 2026 10:36:34 -0400 Received: from mail.maildlp.com (unknown [172.18.224.150]) by frasgout.his.huawei.com (SkyGuard) with ESMTPS id 4fWqsg61c7zJ46BT; Thu, 12 Mar 2026 22:35:35 +0800 (CST) Received: from dubpeml500005.china.huawei.com (unknown [7.214.145.207]) by mail.maildlp.com (Postfix) with ESMTPS id D0C2D4056F; Thu, 12 Mar 2026 22:36:23 +0800 (CST) Received: from localhost (10.203.177.15) by dubpeml500005.china.huawei.com (7.214.145.207) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Thu, 12 Mar 2026 14:36:07 +0000 Date: Thu, 12 Mar 2026 14:36:06 +0000 To: Peter Maydell CC: , Subject: Re: [PATCH 65/65] hw/arm/virt: Allow user to select GICv5 Message-ID: <20260312143606.000020a7@huawei.com> In-Reply-To: <20260223170212.441276-66-peter.maydell@linaro.org> References: <20260223170212.441276-1-peter.maydell@linaro.org> <20260223170212.441276-66-peter.maydell@linaro.org> X-Mailer: Claws Mail 4.3.0 (GTK 3.24.42; x86_64-w64-mingw32) MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.203.177.15] X-ClientProxiedBy: lhrpeml500011.china.huawei.com (7.191.174.215) To dubpeml500005.china.huawei.com (7.214.145.207) Received-SPF: pass client-ip=185.176.79.56; envelope-from=jonathan.cameron@huawei.com; helo=frasgout.his.huawei.com X-Spam_score_int: -24 X-Spam_score: -2.5 X-Spam_bar: -- X-Spam_report: (-2.5 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.819, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.903, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-arm@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-to: Jonathan Cameron From: Jonathan Cameron via Errors-To: qemu-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org Sender: qemu-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org On Mon, 23 Feb 2026 17:02:12 +0000 Peter Maydell wrote: > Allow the user to select a GICv5 via '-machine gic-version=x-5', and > document this. The 'x-' prefix indicates that the emulation is still > in an "experimental" state as far as QEMU is concerned; the > documentation describes what "experimental" means for the user and > what parts are not yet implemented. > > We do not make 'gic-version=max' enable GICv5 here because: > > * the GICv5 architectural spec is still at the EAC level and > could have minor changes between now and its final version; > only users who specifically want to start working with the > GICv5 should select it > * QEMU's implementation here is still not fully featured, > and selecting it instead of GICv3 will mean losing > functionality such as MSIs > * the GICv5 is not backwards compatible with the GICv3/GICv4 > for system software, so silently "upgrading" an existing > command line to GICv5 is just going to break existing guest > kernels > > The last one in particular suggests that even when the emulation > moves out of "experimental" status we will probably not want to > change "max". > > Signed-off-by: Peter Maydell Reviewed-by: Jonathan Cameron Nice start, looking forward to the ITS, ACPI bit and hopefully eventually IWB as all useful for testing purposes. Thanks, Jonathan 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 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B7BCA106703E for ; Thu, 12 Mar 2026 14:37:16 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1w0h9R-0002lR-H1; Thu, 12 Mar 2026 10:36:37 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1w0h9P-0002l6-2B; Thu, 12 Mar 2026 10:36:35 -0400 Received: from frasgout.his.huawei.com ([185.176.79.56]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1w0h9L-0004vt-J8; Thu, 12 Mar 2026 10:36:34 -0400 Received: from mail.maildlp.com (unknown [172.18.224.150]) by frasgout.his.huawei.com (SkyGuard) with ESMTPS id 4fWqsg61c7zJ46BT; Thu, 12 Mar 2026 22:35:35 +0800 (CST) Received: from dubpeml500005.china.huawei.com (unknown [7.214.145.207]) by mail.maildlp.com (Postfix) with ESMTPS id D0C2D4056F; Thu, 12 Mar 2026 22:36:23 +0800 (CST) Received: from localhost (10.203.177.15) by dubpeml500005.china.huawei.com (7.214.145.207) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Thu, 12 Mar 2026 14:36:07 +0000 Date: Thu, 12 Mar 2026 14:36:06 +0000 To: Peter Maydell CC: , Subject: Re: [PATCH 65/65] hw/arm/virt: Allow user to select GICv5 Message-ID: <20260312143606.000020a7@huawei.com> In-Reply-To: <20260223170212.441276-66-peter.maydell@linaro.org> References: <20260223170212.441276-1-peter.maydell@linaro.org> <20260223170212.441276-66-peter.maydell@linaro.org> X-Mailer: Claws Mail 4.3.0 (GTK 3.24.42; x86_64-w64-mingw32) MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.203.177.15] X-ClientProxiedBy: lhrpeml500011.china.huawei.com (7.191.174.215) To dubpeml500005.china.huawei.com (7.214.145.207) Received-SPF: pass client-ip=185.176.79.56; envelope-from=jonathan.cameron@huawei.com; helo=frasgout.his.huawei.com X-Spam_score_int: -24 X-Spam_score: -2.5 X-Spam_bar: -- X-Spam_report: (-2.5 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.819, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.903, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-to: Jonathan Cameron From: Jonathan Cameron via qemu development Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Mon, 23 Feb 2026 17:02:12 +0000 Peter Maydell wrote: > Allow the user to select a GICv5 via '-machine gic-version=x-5', and > document this. The 'x-' prefix indicates that the emulation is still > in an "experimental" state as far as QEMU is concerned; the > documentation describes what "experimental" means for the user and > what parts are not yet implemented. > > We do not make 'gic-version=max' enable GICv5 here because: > > * the GICv5 architectural spec is still at the EAC level and > could have minor changes between now and its final version; > only users who specifically want to start working with the > GICv5 should select it > * QEMU's implementation here is still not fully featured, > and selecting it instead of GICv3 will mean losing > functionality such as MSIs > * the GICv5 is not backwards compatible with the GICv3/GICv4 > for system software, so silently "upgrading" an existing > command line to GICv5 is just going to break existing guest > kernels > > The last one in particular suggests that even when the emulation > moves out of "experimental" status we will probably not want to > change "max". > > Signed-off-by: Peter Maydell Reviewed-by: Jonathan Cameron Nice start, looking forward to the ITS, ACPI bit and hopefully eventually IWB as all useful for testing purposes. Thanks, Jonathan