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[91.219.240.2]) by smtp.gmail.com with ESMTPSA id e5sm23214697wru.92.2020.04.15.02.07.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Apr 2020 02:07:55 -0700 (PDT) From: Vitaly Kuznetsov To: Tianjia Zhang Subject: Re: [PATCH] KVM: Optimize kvm_arch_vcpu_ioctl_run function In-Reply-To: References: <20200413034523.110548-1-tianjia.zhang@linux.alibaba.com> <875ze2ywhy.fsf@vitty.brq.redhat.com> Date: Wed, 15 Apr 2020 11:07:53 +0200 Message-ID: <87a73dxgk6.fsf@vitty.brq.redhat.com> MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-Mailman-Approved-At: Wed, 15 Apr 2020 05:23:47 -0400 Cc: wanpengli@tencent.com, kvm@vger.kernel.org, maz@kernel.org, joro@8bytes.org, x86@kernel.org, linux-kernel@vger.kernel.org, sean.j.christopherson@intel.com, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, pbonzini@redhat.com, tglx@linutronix.de, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, jmattson@google.com X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu Tianjia Zhang writes: > On 2020/4/14 22:26, Vitaly Kuznetsov wrote: >> Tianjia Zhang writes: >> >>> kvm_arch_vcpu_ioctl_run() is only called in the file kvm_main.c, >>> where vcpu->run is the kvm_run parameter, so it has been replaced. >>> >>> Signed-off-by: Tianjia Zhang >>> --- >>> arch/x86/kvm/x86.c | 8 ++++---- >>> virt/kvm/arm/arm.c | 2 +- >>> 2 files changed, 5 insertions(+), 5 deletions(-) >>> >>> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c >>> index 3bf2ecafd027..70e3f4abbd4d 100644 >>> --- a/arch/x86/kvm/x86.c >>> +++ b/arch/x86/kvm/x86.c >>> @@ -8726,18 +8726,18 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) >>> r = -EAGAIN; >>> if (signal_pending(current)) { >>> r = -EINTR; >>> - vcpu->run->exit_reason = KVM_EXIT_INTR; >>> + kvm_run->exit_reason = KVM_EXIT_INTR; >> >> I have a more generic question: why do we need to pass 'kvm_run' to >> kvm_arch_vcpu_ioctl_run() if it can be extracted from 'struct kvm_vcpu'? >> The only call site looks like >> >> virt/kvm/kvm_main.c: r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); >> > > In the earlier version, kvm_run is used to pass parameters with user > mode and is not included in the vcpu structure, so it has been retained > until now. > In case this is no longer needed I'd suggest we drop 'kvm_run' parameter and extract it from 'struct kvm_vcpu' when needed. This looks like a natural add-on to your cleanup patch. -- Vitaly _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Vitaly Kuznetsov Subject: Re: [PATCH] KVM: Optimize kvm_arch_vcpu_ioctl_run function In-Reply-To: References: <20200413034523.110548-1-tianjia.zhang@linux.alibaba.com> <875ze2ywhy.fsf@vitty.brq.redhat.com> Date: Wed, 15 Apr 2020 11:07:53 +0200 Message-ID: <87a73dxgk6.fsf@vitty.brq.redhat.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: To: Tianjia Zhang Cc: kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org, pbonzini@redhat.com, sean.j.christopherson@intel.com, wanpengli@tencent.com, jmattson@google.com, joro@8bytes.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, maz@kernel.org, james.morse@arm.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com Tianjia Zhang writes: > On 2020/4/14 22:26, Vitaly Kuznetsov wrote: >> Tianjia Zhang writes: >> >>> kvm_arch_vcpu_ioctl_run() is only called in the file kvm_main.c, >>> where vcpu->run is the kvm_run parameter, so it has been replaced. >>> >>> Signed-off-by: Tianjia Zhang >>> --- >>> arch/x86/kvm/x86.c | 8 ++++---- >>> virt/kvm/arm/arm.c | 2 +- >>> 2 files changed, 5 insertions(+), 5 deletions(-) >>> >>> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c >>> index 3bf2ecafd027..70e3f4abbd4d 100644 >>> --- a/arch/x86/kvm/x86.c >>> +++ b/arch/x86/kvm/x86.c >>> @@ -8726,18 +8726,18 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) >>> r = -EAGAIN; >>> if (signal_pending(current)) { >>> r = -EINTR; >>> - vcpu->run->exit_reason = KVM_EXIT_INTR; >>> + kvm_run->exit_reason = KVM_EXIT_INTR; >> >> I have a more generic question: why do we need to pass 'kvm_run' to >> kvm_arch_vcpu_ioctl_run() if it can be extracted from 'struct kvm_vcpu'? >> The only call site looks like >> >> virt/kvm/kvm_main.c: r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); >> > > In the earlier version, kvm_run is used to pass parameters with user > mode and is not included in the vcpu structure, so it has been retained > until now. > In case this is no longer needed I'd suggest we drop 'kvm_run' parameter and extract it from 'struct kvm_vcpu' when needed. This looks like a natural add-on to your cleanup patch. -- Vitaly 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=ham 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 4DE25C2BA19 for ; Wed, 15 Apr 2020 09:08:07 +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 219EA206E9 for ; Wed, 15 Apr 2020 09:08:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="I2ZiYuDN"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="VW7jjurx" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 219EA206E9 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:Message-ID:Date:References :In-Reply-To:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=lxdon5cdGYr5EfkI37V9qmdr0hinO4AlMC/gX2RUm/Q=; b=I2ZiYuDNK7FbzI YNMT5Po2v/TEIaKIrZU/ZrDtoJ6540C0Xs4Gl1qOpHnXLk3Hxf6fbWZK6zzIfZdJm+jaR4z6AYHqx vpAZqLzywh4unGG8NEvbGnZeVbUjs+MmoOwbd/FgGhSsfizgOXGeIm+nuD1tZe9Rimsv0bJ04I/j5 3xOaOxIewU5pkF1oWL//YDmrPwO5tLTO5RrAY6EielLAmskwjXlkhuk6Icg4MaV4XdBkacT+mEajO BPWYjhsAHDI+ig0TZDFXPLXekn+cOlj0glTJgZIDISabbYq4+La26jZDZROQKZO9ls4DyPkv5uRGX BX735EE/911uJ/TtPfiA==; 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 1jOe1e-0001vr-P8; Wed, 15 Apr 2020 09:08:06 +0000 Received: from us-smtp-1.mimecast.com ([205.139.110.61] helo=us-smtp-delivery-1.mimecast.com) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jOe1b-0001v8-Hw for linux-arm-kernel@lists.infradead.org; Wed, 15 Apr 2020 09:08:05 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1586941681; 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=/EXNpOGZswAeAZPkceeFE/XM7sXAwUaoIFU9vZ0wVCE=; b=VW7jjurxPbyHCG/FNL75ia3WUyupsknBjqgN4zcWwBQhK+aizFby2zYvoa3V0U/7JGLwOP yNb6V8PKYlMsdJedxapOvy+BafR+8haBgueSZ8yX063UuOgbUcBnJGuVPkHjbheKkU8oAO 66cruLVHMn//rsRIBynU495tFFZGluA= Received: from mail-wm1-f72.google.com (mail-wm1-f72.google.com [209.85.128.72]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-354-i-emuO9kNNq9y6abaLYvEA-1; Wed, 15 Apr 2020 05:07:57 -0400 X-MC-Unique: i-emuO9kNNq9y6abaLYvEA-1 Received: by mail-wm1-f72.google.com with SMTP id t62so5492778wma.0 for ; Wed, 15 Apr 2020 02:07:57 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:in-reply-to:references:date :message-id:mime-version; bh=lisOMIPYzGEOUKW/w9q538cTmyUuHd07/Sojgyr8MlQ=; b=AqZOwrFfmCVpWF+Ps1mjhV4rmhlLFm4TOxsNEu0F899TjRf22bTTmVVxBBaKuGB5L9 Epl4wRG6JbyH7kL0YmDVlaaXsTtXensuhCtnAQiztJNLunrOg6XpeUNRdRBDIkInN+xg PcTtdkQ0Kwq9TWbtZjaPLUtSglMd9w4MybL58U4lfM2H6KvaKhP0FOCkacjMjZlOWBWZ 70rGCUAP91xvOMHV4T3eQxfGE5naDyW7vduz8vsOcks9cfbWd5q5PEmdHX2vnwtT4k9L b1PF2k1P13fHrkC9IcJj6f0Ywtu/R0Fuu+ZgltcFymw9T+oja8bjU35dNF67JS1+WAd2 UY7A== X-Gm-Message-State: AGi0Pub/Uz4LXT+xaPRjU5Wu+DSwkdDiuRLRhWgPPQhyGVhCa/+nc5qq m1S9s5DjOI4ZzHzmKoSvsEsmb5V15HX37hyMhmqHBYGdPsFIUXFfUKggPJn+jexutMWquAk0cAw 76xVMZd+WfbILsff1UcUys5WO/R2dBq2vBb4= X-Received: by 2002:a5d:6841:: with SMTP id o1mr27977391wrw.412.1586941676336; Wed, 15 Apr 2020 02:07:56 -0700 (PDT) X-Google-Smtp-Source: APiQypIXD/p9LNlXg20pn+U/yQCcvvORh177d5YZbgu7SsoqIprQYNJ2FhjSis/HsfEJeQMW+4tCHg== X-Received: by 2002:a5d:6841:: with SMTP id o1mr27977353wrw.412.1586941676047; Wed, 15 Apr 2020 02:07:56 -0700 (PDT) Received: from vitty.brq.redhat.com (g-server-2.ign.cz. [91.219.240.2]) by smtp.gmail.com with ESMTPSA id e5sm23214697wru.92.2020.04.15.02.07.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Apr 2020 02:07:55 -0700 (PDT) From: Vitaly Kuznetsov To: Tianjia Zhang Subject: Re: [PATCH] KVM: Optimize kvm_arch_vcpu_ioctl_run function In-Reply-To: References: <20200413034523.110548-1-tianjia.zhang@linux.alibaba.com> <875ze2ywhy.fsf@vitty.brq.redhat.com> Date: Wed, 15 Apr 2020 11:07:53 +0200 Message-ID: <87a73dxgk6.fsf@vitty.brq.redhat.com> MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200415_020803_668894_FDF7F1F5 X-CRM114-Status: GOOD ( 12.32 ) 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, james.morse@arm.com, kvm@vger.kernel.org, suzuki.poulose@arm.com, maz@kernel.org, joro@8bytes.org, x86@kernel.org, linux-kernel@vger.kernel.org, sean.j.christopherson@intel.com, mingo@redhat.com, bp@alien8.de, julien.thierry.kdev@gmail.com, hpa@zytor.com, pbonzini@redhat.com, tglx@linutronix.de, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, jmattson@google.com 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 Tianjia Zhang writes: > On 2020/4/14 22:26, Vitaly Kuznetsov wrote: >> Tianjia Zhang writes: >> >>> kvm_arch_vcpu_ioctl_run() is only called in the file kvm_main.c, >>> where vcpu->run is the kvm_run parameter, so it has been replaced. >>> >>> Signed-off-by: Tianjia Zhang >>> --- >>> arch/x86/kvm/x86.c | 8 ++++---- >>> virt/kvm/arm/arm.c | 2 +- >>> 2 files changed, 5 insertions(+), 5 deletions(-) >>> >>> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c >>> index 3bf2ecafd027..70e3f4abbd4d 100644 >>> --- a/arch/x86/kvm/x86.c >>> +++ b/arch/x86/kvm/x86.c >>> @@ -8726,18 +8726,18 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) >>> r = -EAGAIN; >>> if (signal_pending(current)) { >>> r = -EINTR; >>> - vcpu->run->exit_reason = KVM_EXIT_INTR; >>> + kvm_run->exit_reason = KVM_EXIT_INTR; >> >> I have a more generic question: why do we need to pass 'kvm_run' to >> kvm_arch_vcpu_ioctl_run() if it can be extracted from 'struct kvm_vcpu'? >> The only call site looks like >> >> virt/kvm/kvm_main.c: r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); >> > > In the earlier version, kvm_run is used to pass parameters with user > mode and is not included in the vcpu structure, so it has been retained > until now. > In case this is no longer needed I'd suggest we drop 'kvm_run' parameter and extract it from 'struct kvm_vcpu' when needed. This looks like a natural add-on to your cleanup patch. -- Vitaly _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel