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=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS 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 6C0FEC2BA1A for ; Fri, 3 Apr 2020 15:31:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3E64B2073B for ; Fri, 3 Apr 2020 15:31:22 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="chfu5wP7" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404343AbgDCPbV (ORCPT ); Fri, 3 Apr 2020 11:31:21 -0400 Received: from us-smtp-1.mimecast.com ([205.139.110.61]:40356 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2404329AbgDCPbP (ORCPT ); Fri, 3 Apr 2020 11:31:15 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1585927874; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=o9+iQkDrjMDPGfCAP/TxUctBQwhHf6q/sd2P4Ro4S4c=; b=chfu5wP7vxou1UzafpExd5o3Nlu44PfNCHbKnZVo+BEHL5631KmaefWK/04TDZAbc923mY lD1MWV3EcaJVowd5L00tIiWPTQObnuMMHW7F4XYI1mlFSt9iuX5/8v4yj7zvGCFh7GpIQi QhpuwvQ7CZXbihX+1kRVUwxVD4sDtoA= 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-282-f7XVJwvaPGuR86Le5qU1SQ-1; Fri, 03 Apr 2020 11:31:10 -0400 X-MC-Unique: f7XVJwvaPGuR86Le5qU1SQ-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id BDC4D8017CE; Fri, 3 Apr 2020 15:31:08 +0000 (UTC) Received: from t480s.redhat.com (ovpn-112-213.ams2.redhat.com [10.36.112.213]) by smtp.corp.redhat.com (Postfix) with ESMTP id D633626DC4; Fri, 3 Apr 2020 15:31:06 +0000 (UTC) From: David Hildenbrand To: kvm@vger.kernel.org Cc: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, Vasily Gorbik , Heiko Carstens , Cornelia Huck , Janosch Frank , Christian Borntraeger , David Hildenbrand Subject: [PATCH v2 5/5] KVM: s390: vsie: gmap_table_walk() simplifications Date: Fri, 3 Apr 2020 17:30:50 +0200 Message-Id: <20200403153050.20569-6-david@redhat.com> In-Reply-To: <20200403153050.20569-1-david@redhat.com> References: <20200403153050.20569-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Content-Transfer-Encoding: quoted-printable Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Let's use asce_type where applicable. Also, simplify our sanity check for valid table levels and convert it into a WARN_ON_ONCE(). Check if we even have a valid gmap shadow as the very first step. Signed-off-by: David Hildenbrand --- arch/s390/mm/gmap.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c index 24ef30fb0833..a2bd8d7792e9 100644 --- a/arch/s390/mm/gmap.c +++ b/arch/s390/mm/gmap.c @@ -788,19 +788,19 @@ static inline unsigned long *gmap_table_walk(struct= gmap *gmap, unsigned long gaddr, int level) { const int asce_type =3D gmap->asce & _ASCE_TYPE_MASK; - unsigned long *table; + unsigned long *table =3D gmap->table; =20 - if ((gmap->asce & _ASCE_TYPE_MASK) + 4 < (level * 4)) - return NULL; if (gmap_is_shadow(gmap) && gmap->removed) return NULL; =20 + if (WARN_ON_ONCE(level > (asce_type >> 2) + 1)) + return NULL; + if (WARN_ON_ONCE(asce_type !=3D _ASCE_TYPE_REGION1 && gaddr & (-1UL << (31 + (asce_type >> 2) * 11)))) return NULL; =20 - table =3D gmap->table; - switch (gmap->asce & _ASCE_TYPE_MASK) { + switch (asce_type) { case _ASCE_TYPE_REGION1: table +=3D (gaddr & _REGION1_INDEX) >> _REGION1_SHIFT; if (level =3D=3D 4) --=20 2.25.1