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 2300BC4332D for ; Thu, 19 Mar 2020 12:18:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EF17B20739 for ; Thu, 19 Mar 2020 12:18:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1584620324; bh=9n5iSscoqYAjXl49/svHpLf5qsJKzfPfCazHWgnTthY=; h=Date:From:To:Cc:Subject:In-Reply-To:References:List-ID:From; b=OjpixaUICXiDcCmZ6xBJExMwUrx/kLV34NiFvkkyLHhey0WmTxEilL3YXTlshb/Kb UHL4t0Hv/Ux9wf7JO5wMnVfFyLcLG/7eH3UoityRRhftlae4TgTX43YV+uoJhv5VXt bGIjVUVccDgUAJPx4uSME3qQZSbRsSlo1P5+Zf+0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726867AbgCSMSl (ORCPT ); Thu, 19 Mar 2020 08:18:41 -0400 Received: from mail.kernel.org ([198.145.29.99]:60278 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725787AbgCSMSl (ORCPT ); Thu, 19 Mar 2020 08:18:41 -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 6518E20663; Thu, 19 Mar 2020 12:18:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1584620320; bh=9n5iSscoqYAjXl49/svHpLf5qsJKzfPfCazHWgnTthY=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=hMSyvzWudmn5PzqltwH9zVaoJflLaueZMoY7JuIBTmbwkmjCNT2hHrPKP5wQH72Yh QFw0yTyO2UEaw6WkBq6MKpEtt6gXN8nHKmL84bm4cma4fb8H2wB9x2hE3YrL1/HpSO TyT89wwVpUtFpxgCHtakHPiwm6ZKyuZAtda9p8uI= Received: from disco-boy.misterjones.org ([51.254.78.96] helo=www.loen.fr) by disco-boy.misterjones.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.92) (envelope-from ) id 1jEu8E-00Dvom-M6; Thu, 19 Mar 2020 12:18:38 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Date: Thu, 19 Mar 2020 12:18:38 +0000 From: Marc Zyngier To: Zenghui Yu Cc: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Lorenzo Pieralisi , Jason Cooper , Robert Richter , Thomas Gleixner , Eric Auger , James Morse , Julien Thierry , Suzuki K Poulose Subject: Re: [PATCH v5 21/23] KVM: arm64: GICv4.1: Reload VLPI configuration on distributor enable/disable In-Reply-To: <7f112d75-166b-24eb-538d-e100242d8e9a@huawei.com> References: <20200304203330.4967-1-maz@kernel.org> <20200304203330.4967-22-maz@kernel.org> <7f112d75-166b-24eb-538d-e100242d8e9a@huawei.com> Message-ID: X-Sender: maz@kernel.org User-Agent: Roundcube Webmail/1.3.10 X-SA-Exim-Connect-IP: 51.254.78.96 X-SA-Exim-Rcpt-To: yuzenghui@huawei.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, lorenzo.pieralisi@arm.com, jason@lakedaemon.net, rrichter@marvell.com, tglx@linutronix.de, eric.auger@redhat.com, james.morse@arm.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 2020-03-18 03:17, Zenghui Yu wrote: > On 2020/3/5 4:33, Marc Zyngier wrote: >> Each time a Group-enable bit gets flipped, the state of these bits >> needs to be forwarded to the hardware. This is a pretty heavy >> handed operation, requiring all vcpus to reload their GICv4 >> configuration. It is thus implemented as a new request type. > > [note to myself] > ... and the status are forwarded to HW by programming VGrp{0,1}En > fields of GICR_VPENDBASER when vPEs are made resident next time. I've added something based on this comment to the commit message. Thanks! M. -- Jazz is not dead. It just smells funny...