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 2F7B6C004C0 for ; Mon, 23 Oct 2023 15:14:41 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1quwcM-0008LU-PQ; Mon, 23 Oct 2023 11:13:22 -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 1quwcK-0008Jl-RX; Mon, 23 Oct 2023 11:13:20 -0400 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1quwcG-0006tU-Vk; Mon, 23 Oct 2023 11:13:20 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=a7KCwc6kpWICvbr3wDa3gXSFSI8zZxkI0fbSpfd2dW0=; b=ZWTRKa4H264HFM+Wbyam6/OMfC hw9IbWnFhI07e3rr6k9Kh9yBgFkm2K3Fdc3pgF6V0ZCrzNuBv9q5PVUNJGOZzEjI/n0TD5mnlo4Y5 /Ot3JFYMvfQDtXzlZ5y+PsmwwPMV0U0osA/zoVbcmW3fw84V0xtE086Mwrk6xahzQfg+uEpBFP9ND 7Lw5wu4d294DnDdYyqqE2yNHMLorW7HyGoBM5I53ejKso1PwONfdcYmxVzfk0mFyQr2ZwKY9BRKYr EZd2OBEl/49j+M3SfhKDgszJMUDrjIRsfsQTxh3h1K/moa7bYPXljdGDiTTLv29DlTFuXSONgHqOI 0FYo6V7w==; Received: from [2001:8b0:10b:5:545e:5208:5de0:9d33] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1quwbt-00EUbh-SS; Mon, 23 Oct 2023 15:12:53 +0000 Message-ID: Subject: Re: [RFC PATCH 01/19] cpus: Add argument to qemu_get_cpu() to filter CPUs by QOM type From: David Woodhouse To: Philippe =?ISO-8859-1?Q?Mathieu-Daud=E9?= , qemu-devel@nongnu.org Cc: Thomas Huth , Richard Henderson , Paolo Bonzini , Alistair Francis , qemu-arm@nongnu.org, qemu-riscv@nongnu.org, "Edgar E. Iglesias" , qemu-ppc@nongnu.org, Eduardo Habkost , "Michael S. Tsirkin" , qemu-s390x@nongnu.org, Peter Maydell , Alex =?ISO-8859-1?Q?Benn=E9e?= , Zhao Liu , Andrey Smirnov , Radoslaw Biernacki , Leif Lindholm , Marcin Juszkiewicz , Shannon Zhao , Igor Mammedov , Ani Sinha , Alistair Francis , Paul Durrant , Marcel Apfelbaum , Palmer Dabbelt , Bin Meng , Weiwei Li , Daniel Henrique Barboza , Liu Zhiwei , Song Gao , Thomas Huth , Christian Borntraeger , Halil Pasic , Eric Farman , David Hildenbrand , Ilya Leoshkevich , Yanan Wang , "Dr. David Alan Gilbert" , Marcelo Tosatti , Aurelien Jarno , Jiaxun Yang , Aleksandar Rikalo , kvm@vger.kernel.org Date: Mon, 23 Oct 2023 16:12:52 +0100 In-Reply-To: <20231020163643.86105-2-philmd@linaro.org> References: <20231020163643.86105-1-philmd@linaro.org> <20231020163643.86105-2-philmd@linaro.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-FWRpaywbbUZVahT/LGYI" User-Agent: Evolution 3.44.4-0ubuntu2 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Received-SPF: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+91fa634947ba19782c4e+7365+infradead.org+dwmw2@casper.srs.infradead.org; helo=casper.infradead.org X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=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: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org --=-FWRpaywbbUZVahT/LGYI Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2023-10-20 at 18:36 +0200, Philippe Mathieu-Daud=C3=A9 wrote: > Heterogeneous machines have different type of CPU. > qemu_get_cpu() returning unfiltered CPUs doesn't make > sense anymore. Add a 'type' argument to filter CPU by > QOM type. >=20 > Type in "hw/core/cpu.h" and implementation in cpu-common.c > modified manually, then convert all call sites by passing > a NULL argument using the following coccinelle script: >=20 > =C2=A0 @@ > =C2=A0 expression index; > =C2=A0 @@ > =C2=A0 -=C2=A0=C2=A0 qemu_get_cpu(index) > =C2=A0 +=C2=A0=C2=A0 qemu_get_cpu(index, NULL) >=20 > Signed-off-by: Philippe Mathieu-Daud=C3=A9 > --- > RFC: Is this hot path code? What is the cost of this QOM cast check? A bunch of them in the Xen emulation code are during interrupt delivery. So yes, kind of hot path :) In hw/i386/kvm/xen_evtchn.c I they're almost all just looking up a CPU with qemu_get_cpu() so that they can call kvm_arch_vcpu_id() to get its APIC ID. Mostly to send an MSI there or otherwise talk to the kernel about it. Perhaps it could keep a simple array of { vCPU ID, APIC ID } instead. There's one case in valid_vcpu() where it's checking that a given vCPU does exist, which could use that same array. In target/i386/kvm/xen-emu.c there are some slow paths which are less interesting (xen_set_shared_info(), kvm_xen_has_vcpu_callback_vector(), kvm_xen_set_vcpu_virq(), kvm_xen_hcall_evtchn_upcall_vector() kvm_xen_hcall_vcpu_op() does have a fast path (the singleshot timer handling, although most guests seem to use a different hypercall for that). But it doesn't actually call qemu_get_cpu() for that fast path anyway, since it'll use the CPU it was *called* on. kvm_xen_get_vcpu_info_hva() wants a pointer stored in cpu->env, and is called in *one* fast path in xen_evtchn.c, again interrupt delivery (in set_port_pending). But only in the case where we're running on an old kernel and don't just ask the kernel to deliver the event. So I can live with not optimising that. kvm_xen_set_callback_asserted() is only for the case where event channels are being delivered to the guest via emulated GSI, so not the high-performance case. And I still do want to hook that up properly to the ack on the *interrupt controllers* anyway (qv=C2=B9). Finally, kvm_xen_injecft_vcpu_callback_vector() is also only for older kernels where we don't ask the kernel to deliver the event.=20 tl;dr: we don't care about anything in xen.emu.c. 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