From patchwork Thu Apr 2 18:48:14 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 11471249 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E91001668 for ; Thu, 2 Apr 2020 18:48:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C199020719 for ; Thu, 2 Apr 2020 18:48:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="O1td6uof" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388971AbgDBSs3 (ORCPT ); Thu, 2 Apr 2020 14:48:29 -0400 Received: from us-smtp-1.mimecast.com ([205.139.110.61]:45895 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1732214AbgDBSs3 (ORCPT ); Thu, 2 Apr 2020 14:48:29 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1585853308; 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; bh=in1JW2F7wVAjQuehuFAsT9rFLhWovQC510FWxPd6gOY=; b=O1td6uofzPDkkf8DBUfSMRG6TqLjXt4ED6F5Zj5J+V+BQn2ytmedCQZ+qeV7bhdgHU86Gg uoROf294H8qj0IfGr9UDOKtScC2lGLweQQeETBoQIe9gPPnJEck54j7R50WueEawPlU9ti PtriJx2um3O/hEhRYzwFLl/wHDIrF2k= 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-284-U1l9J9PpNNeAqadNNHj6-Q-1; Thu, 02 Apr 2020 14:48:26 -0400 X-MC-Unique: U1l9J9PpNNeAqadNNHj6-Q-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 0FD031926DA0; Thu, 2 Apr 2020 18:48:25 +0000 (UTC) Received: from t480s.redhat.com (ovpn-114-29.ams2.redhat.com [10.36.114.29]) by smtp.corp.redhat.com (Postfix) with ESMTP id 90D1E60BF4; Thu, 2 Apr 2020 18:48:20 +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 v1 0/5] KVM: s390: vsie: fixes and cleanups. Date: Thu, 2 Apr 2020 20:48:14 +0200 Message-Id: <20200402184819.34215-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Some vsie/gmap fixes and two cleanups/improvements. Patch #1 fixes an issue reported by Janosch. It was never observed so far, because KVM usually doesn't use a region 1 table for it's guest (unless memory would be exceeding something like 16 EB, which isn't even supported by the HW). Older QEMU+KVM or other hypervisors can trigger this. Patch #2 fixes a code path that probably was never taken and will most probably not be taken very often in the future - unless somebody really messes up the page tables for a guest (or writes a test for it). At some point, a test case for this would be nice. Patch #3 fixes a rare possible race. Don't think this is stable material. Gave it some testing with my limited access to somewhat-fast s390x machines. Booted a Linux kernel, supplying all possible number of page table hiearchies. David Hildenbrand (5): KVM: s390: vsie: Fix region 1 ASCE sanity shadow address checks KVM: s390: vsie: Fix delivery of addressing exceptions KVM: s390: vsie: Fix possible race when shadowing region 3 tables KVM: s390: vsie: Move conditional reschedule KVM: s390: vsie: gmap_table_walk() simplifications arch/s390/kvm/vsie.c | 4 ++-- arch/s390/mm/gmap.c | 14 ++++++++++---- 2 files changed, 12 insertions(+), 6 deletions(-)