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 54E6BC433DF for ; Thu, 2 Jul 2020 09:17:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 30BF120748 for ; Thu, 2 Jul 2020 09:17:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1593681475; bh=riJbnj3lW3s52zzCoIpgx8rEdxBveXjj8C/8uqF6YXA=; h=Date:From:To:Cc:Subject:In-Reply-To:References:List-ID:From; b=gck6ODPT4HC0M5Jwslc8Eq95TYIWqPW+v+KgjXfS/Z7jePiguDvb7X9gcjLw5y9O1 NMgKndd6QEHE2NmTW3CtccW11uOHJUQOV+toURkBWpePXpZ0GGwcIN1fuBy2ag0M15 tGiOBgsAwL4fGhQCJ4wtOQ8/P4yRFtmMrpr21sRs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728097AbgGBJRy (ORCPT ); Thu, 2 Jul 2020 05:17:54 -0400 Received: from mail.kernel.org ([198.145.29.99]:42782 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727057AbgGBJRy (ORCPT ); Thu, 2 Jul 2020 05:17:54 -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 9682A20702; Thu, 2 Jul 2020 09:17:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1593681473; bh=riJbnj3lW3s52zzCoIpgx8rEdxBveXjj8C/8uqF6YXA=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=mS7Kx7xYu+bjeniGuvdTqxDXvaGhLAfh6dHUKqojLyPj+YnkZTflqYGw3OX9HzrGD Ycbo5dO99JLrgJFCqQFaHhTZl218E1kvwpL41NITMDrC54GRgfV/COebsqB+sSI+Fo +8yCWS16sszLfyai63yMS9HBlW9Q1vmMRZc1cKTw= 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 1jqvLs-008L2R-4Q; Thu, 02 Jul 2020 10:17:52 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Date: Thu, 02 Jul 2020 10:17:52 +0100 From: Marc Zyngier To: Jingyi Wang Cc: drjones@redhat.com, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu Subject: Re: [kvm-unit-tests PATCH v2 3/8] arm64: microbench: gic: Add gicv4.1 support for ipi latency test. In-Reply-To: References: <20200702030132.20252-1-wangjingyi11@huawei.com> <20200702030132.20252-4-wangjingyi11@huawei.com> User-Agent: Roundcube Webmail/1.4.5 Message-ID: <10c3562dc019a3440d82dd507918faef@kernel.org> X-Sender: maz@kernel.org X-SA-Exim-Connect-IP: 51.254.78.96 X-SA-Exim-Rcpt-To: wangjingyi11@huawei.com, drjones@redhat.com, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu 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 2020-07-02 10:02, Jingyi Wang wrote: > Hi Marc, > > On 7/2/2020 4:22 PM, Marc Zyngier wrote: >> On 2020-07-02 04:01, Jingyi Wang wrote: >>> If gicv4.1(sgi hardware injection) supported, we test ipi injection >>> via hw/sw way separately. >> >> nit: active-less SGIs are not strictly a feature of GICv4.1 (you could >> imagine a GIC emulation offering the same thing). Furthermore, GICv4.1 >> isn't as such visible to the guest itself (it only sees a GICv3). >> >> Thanks, >> >>         M. > > Yes, but to measure the performance difference of hw/sw SGI injection, > do you think it is acceptable to make it visible to guest and let it > switch SGI injection mode? It is of course acceptable. I simply object to the "GICv4.1" description. M. -- Jazz is not dead. It just smells funny...