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[23.128.96.18]) by mx.google.com with ESMTP id p10si13519447ejy.70.2020.09.17.02.54.11; Thu, 17 Sep 2020 02:54:35 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=OKINf+Mu; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726584AbgIQJwS (ORCPT + 99 others); Thu, 17 Sep 2020 05:52:18 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:33514 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726539AbgIQJwH (ORCPT ); Thu, 17 Sep 2020 05:52:07 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1600336326; 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=nI7gqByx+HGjF7uAOxbv2eIXkfB1+ppWt4NPBNuXzwU=; b=OKINf+MuZdpwezWCz5rxwf27l4/lFjpW0rFnfOx120rHsyZ+fT9tjij/yo4Ed5SXTy4RVu KWCAFikoy01+z+KHKXUvi4pKAD6Qe5dACDS20YwA/fgdu0YUs/UmEXy/hzcd3YBWxZsZmh cRhxjBedlIAVJPu7reQFx2L3jibmxRY= 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-466-qBMttKJrPuqY11Olw0jp0Q-1; Thu, 17 Sep 2020 05:45:56 -0400 X-MC-Unique: qBMttKJrPuqY11Olw0jp0Q-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 5EC4B64149; Thu, 17 Sep 2020 09:45:54 +0000 (UTC) Received: from starship (unknown [10.35.206.187]) by smtp.corp.redhat.com (Postfix) with ESMTP id 2E75D7E73E; Thu, 17 Sep 2020 09:45:49 +0000 (UTC) Message-ID: <24eaf0bbbc64da013b724adf1d6b2e0d53a6ed99.camel@redhat.com> Subject: Re: [PATCH] KVM: SVM: use __GFP_ZERO instead of clear_page() From: Maxim Levitsky To: lihaiwei.kernel@gmail.com, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: pbonzini@redhat.com, sean.j.christopherson@intel.com, vkuznets@redhat.com, wanpengli@tencent.com, jmattson@google.com, joro@8bytes.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, Haiwei Li Date: Thu, 17 Sep 2020 12:45:48 +0300 In-Reply-To: <20200916083621.5512-1-lihaiwei.kernel@gmail.com> References: <20200916083621.5512-1-lihaiwei.kernel@gmail.com> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.36.3 (3.36.3-1.fc32) MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2020-09-16 at 16:36 +0800, lihaiwei.kernel@gmail.com wrote: > From: Haiwei Li > > Use __GFP_ZERO while alloc_page(). > > Signed-off-by: Haiwei Li > --- > arch/x86/kvm/svm/avic.c | 6 ++---- > 1 file changed, 2 insertions(+), 4 deletions(-) > > diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c > index ac830cd50830..f73f84d56452 100644 > --- a/arch/x86/kvm/svm/avic.c > +++ b/arch/x86/kvm/svm/avic.c > @@ -153,20 +153,18 @@ int avic_vm_init(struct kvm *kvm) > return 0; > > /* Allocating physical APIC ID table (4KB) */ > - p_page = alloc_page(GFP_KERNEL_ACCOUNT); > + p_page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO); > if (!p_page) > goto free_avic; > > kvm_svm->avic_physical_id_table_page = p_page; > - clear_page(page_address(p_page)); > > /* Allocating logical APIC ID table (4KB) */ > - l_page = alloc_page(GFP_KERNEL_ACCOUNT); > + l_page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO); > if (!l_page) > goto free_avic; > > kvm_svm->avic_logical_id_table_page = l_page; > - clear_page(page_address(l_page)); > > spin_lock_irqsave(&svm_vm_data_hash_lock, flags); > again: Reviewed-by: Maxim Levitsky Best regards, Maxim Levitsky