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=-6.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,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 C3BFDC433E2 for ; Tue, 8 Sep 2020 06:29:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 66BFC21532 for ; Tue, 8 Sep 2020 06:29:11 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Etid05sC" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728881AbgIHG3K (ORCPT ); Tue, 8 Sep 2020 02:29:10 -0400 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:51033 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728922AbgIHG3G (ORCPT ); Tue, 8 Sep 2020 02:29:06 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1599546544; 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=hcS4bohu+7qrBxlXWC4Kf3mI9aW+AequAk++olk9s6U=; b=Etid05sCjjMQ6+D0fm7RDSBt6dBUfyI5Nbs/ut+0/1wRCHPSYhOzH0aezTtsr5pFkP/HH4 WAHjdM5dwQcz1P9IeHtrKdBH9rqi2eENpvALOBKLKz1Tfq9IKwSl4+bJOao0XsRJmLMxVB s+hcvOG84zC2r9aJvqg4fhpSJlB+4A4= 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-153-YEAqneceNfePVWUixWtEgQ-1; Tue, 08 Sep 2020 02:28:59 -0400 X-MC-Unique: YEAqneceNfePVWUixWtEgQ-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 5B9C610ABDA5; Tue, 8 Sep 2020 06:28:58 +0000 (UTC) Received: from gondolin (ovpn-112-243.ams2.redhat.com [10.36.112.243]) by smtp.corp.redhat.com (Postfix) with ESMTP id B3B3F1002D40; Tue, 8 Sep 2020 06:28:52 +0000 (UTC) Date: Tue, 8 Sep 2020 08:28:49 +0200 From: Cornelia Huck To: Janosch Frank Cc: linux-s390@vger.kernel.org, borntraeger@de.ibm.com, gor@linux.ibm.com, imbrenda@linux.ibm.com, kvm@vger.kernel.org, david@redhat.com, hca@linux.ibm.com Subject: Re: [PATCH v2 1/2] s390x: uv: Add destroy page call Message-ID: <20200908082849.7e4a661d.cohuck@redhat.com> In-Reply-To: <20200907124700.10374-2-frankja@linux.ibm.com> References: <20200907124700.10374-1-frankja@linux.ibm.com> <20200907124700.10374-2-frankja@linux.ibm.com> Organization: Red Hat GmbH MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Mon, 7 Sep 2020 08:46:59 -0400 Janosch Frank wrote: > We don't need to export pages if we destroy the VM configuration > afterwards anyway. Instead we can destroy the page which will zero it > and then make it accessible to the host. > > Destroying is about twice as fast as the export. > > Signed-off-by: Janosch Frank > Reviewed-by: Claudio Imbrenda > --- > arch/s390/include/asm/uv.h | 7 +++++++ > arch/s390/kernel/uv.c | 20 ++++++++++++++++++++ > arch/s390/mm/gmap.c | 2 +- > 3 files changed, 28 insertions(+), 1 deletion(-) Reviewed-by: Cornelia Huck