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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable 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 0E635C55186 for ; Thu, 23 Apr 2020 10:40:16 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id CF97020857 for ; Thu, 23 Apr 2020 10:40:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="V3x6JWST"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="fXxvO3LT" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CF97020857 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=fODwLqK9zR3iymXbHbX1yjQbRr0XR39/Hut7nSRpybs=; b=V3x6JWSTX35cyd eUWSkegI0nuKIVm/Z/uDzZFbWJXcr9H5vTamCmFXP2Qb8LIBWamAoVdwKE8dny4ano59TplCSmImM 22wAa0i5Z719wcII60NA6Wbya25Yp6DKRNrDApCZUeCC+iq6BYVqyV5XkCtr0HHVoE4dd7RY8P8w9 z0fvSJrsz0qUZAtX0c9ZF8wZ3xE/1VN+9QtnyCeYvsuc9v4hIailzn4E2++TBIG7yTRTulC2D0bhg WKw/UJ0hQNRt0S17edn7ahkVuAH9jWGWvZY+/nGkvQxDMdgO8YPB0naUzAD7vrHimO9qt+XnOHd0p IIP8dlcSwZPECxnPc4ZA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jRZHC-0005N3-RH; Thu, 23 Apr 2020 10:40:14 +0000 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120] helo=us-smtp-1.mimecast.com) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jRZH9-0004tm-Tb for linux-arm-kernel@lists.infradead.org; Thu, 23 Apr 2020 10:40:13 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1587638409; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=+r/PR2FbN4xLG8Nok2HJ4M/QJoOCF0Nk3Bss40sN0xs=; b=fXxvO3LT5E5bMJ1lS/1sLXYAIqgkDHXkc5UkqJjRX0qUciSWPapxhGwj54mmTVn/CpRB+O 4jy9J/DLtX8z2ua/sgHBFvTLXswjXTk/RE26umit/WVVuyqpBvqEOVmcJvh4+czILVkARZ IsPtIUn6CMMqHUFe+Lv6dwoNkBOXhGc= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-246-AkzxH94nMVKFKkFx37Ew_w-1; Thu, 23 Apr 2020 06:39:20 -0400 X-MC-Unique: AkzxH94nMVKFKkFx37Ew_w-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 07DD5835B41; Thu, 23 Apr 2020 10:39:17 +0000 (UTC) Received: from gondolin (ovpn-112-121.ams2.redhat.com [10.36.112.121]) by smtp.corp.redhat.com (Postfix) with ESMTP id 11C6260608; Thu, 23 Apr 2020 10:39:03 +0000 (UTC) Date: Thu, 23 Apr 2020 12:39:01 +0200 From: Cornelia Huck To: Tianjia Zhang Subject: Re: [PATCH v2 1/7] KVM: s390: clean up redundant 'kvm_run' parameters Message-ID: <20200423123901.72a4c6a4.cohuck@redhat.com> In-Reply-To: <5e1e126d-f1b0-196c-594b-4289d0afb9a8@linux.alibaba.com> References: <20200422125810.34847-1-tianjia.zhang@linux.alibaba.com> <20200422125810.34847-2-tianjia.zhang@linux.alibaba.com> <20200422154543.2efba3dd.cohuck@redhat.com> <20200422180403.03f60b0c.cohuck@redhat.com> <5e1e126d-f1b0-196c-594b-4289d0afb9a8@linux.alibaba.com> Organization: Red Hat GmbH MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200423_034012_049556_AE014AB4 X-CRM114-Status: GOOD ( 19.64 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: wanpengli@tencent.com, kvm@vger.kernel.org, david@redhat.com, benh@kernel.crashing.org, heiko.carstens@de.ibm.com, peterx@redhat.com, linux-mips@vger.kernel.org, paulus@ozlabs.org, hpa@zytor.com, kvmarm@lists.cs.columbia.edu, linux-s390@vger.kernel.org, frankja@linux.ibm.com, maz@kernel.org, joro@8bytes.org, x86@kernel.org, Christian Borntraeger , mingo@redhat.com, julien.thierry.kdev@gmail.com, thuth@redhat.com, gor@linux.ibm.com, suzuki.poulose@arm.com, kvm-ppc@vger.kernel.org, bp@alien8.de, tglx@linutronix.de, linux-arm-kernel@lists.infradead.org, jmattson@google.com, tsbogend@alpha.franken.de, christoffer.dall@arm.com, sean.j.christopherson@intel.com, linux-kernel@vger.kernel.org, james.morse@arm.com, mpe@ellerman.id.au, pbonzini@redhat.com, vkuznets@redhat.com, linuxppc-dev@lists.ozlabs.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, 23 Apr 2020 11:01:43 +0800 Tianjia Zhang wrote: > On 2020/4/23 0:04, Cornelia Huck wrote: > > On Wed, 22 Apr 2020 17:58:04 +0200 > > Christian Borntraeger wrote: > > > >> On 22.04.20 15:45, Cornelia Huck wrote: > >>> On Wed, 22 Apr 2020 20:58:04 +0800 > >>> Tianjia Zhang wrote: > >>> > >>>> In the current kvm version, 'kvm_run' has been included in the 'kvm_vcpu' > >>>> structure. Earlier than historical reasons, many kvm-related function > >>> > >>> s/Earlier than/For/ ? > >>> > >>>> parameters retain the 'kvm_run' and 'kvm_vcpu' parameters at the same time. > >>>> This patch does a unified cleanup of these remaining redundant parameters. > >>>> > >>>> Signed-off-by: Tianjia Zhang > >>>> --- > >>>> arch/s390/kvm/kvm-s390.c | 37 ++++++++++++++++++++++--------------- > >>>> 1 file changed, 22 insertions(+), 15 deletions(-) > >>>> > >>>> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c > >>>> index e335a7e5ead7..d7bb2e7a07ff 100644 > >>>> --- a/arch/s390/kvm/kvm-s390.c > >>>> +++ b/arch/s390/kvm/kvm-s390.c > >>>> @@ -4176,8 +4176,9 @@ static int __vcpu_run(struct kvm_vcpu *vcpu) > >>>> return rc; > >>>> } > >>>> > >>>> -static void sync_regs_fmt2(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) > >>>> +static void sync_regs_fmt2(struct kvm_vcpu *vcpu) > >>>> { > >>>> + struct kvm_run *kvm_run = vcpu->run; > >>>> struct runtime_instr_cb *riccb; > >>>> struct gs_cb *gscb; > >>>> > >>>> @@ -4235,7 +4236,7 @@ static void sync_regs_fmt2(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) > >>>> } > >>>> if (vcpu->arch.gs_enabled) { > >>>> current->thread.gs_cb = (struct gs_cb *) > >>>> - &vcpu->run->s.regs.gscb; > >>>> + &kvm_run->s.regs.gscb; > >>> > >>> Not sure if these changes (vcpu->run-> => kvm_run->) are really worth > >>> it. (It seems they amount to at least as much as the changes advertised > >>> in the patch description.) > >>> > >>> Other opinions? > >> > >> Agreed. It feels kind of random. Maybe just do the first line (move kvm_run from the > >> function parameter list into the variable declaration)? Not sure if this is better. > >> > > > > There's more in this patch that I cut... but I think just moving > > kvm_run from the parameter list would be much less disruptive. > > > > I think there are two kinds of code(`vcpu->run->` and `kvm_run->`), but > there will be more disruptive, not less. I just fail to see the benefit; sure, kvm_run-> is convenient, but the current code is just fine, and any rework should be balanced against the cost (e.g. cluttering git annotate). _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel