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 B6448C433E2 for ; Tue, 8 Sep 2020 06:39:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6365821532 for ; Tue, 8 Sep 2020 06:39:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="cd6Bvypm" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728776AbgIHGjx (ORCPT ); Tue, 8 Sep 2020 02:39:53 -0400 Received: from us-smtp-2.mimecast.com ([207.211.31.81]:25740 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728115AbgIHGjw (ORCPT ); Tue, 8 Sep 2020 02:39:52 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1599547191; 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=rsoJDQwHbzc2FzKEG0oCLi6Fz8Nuu83Q3N2T5Y49xnI=; b=cd6Bvypm/lgac278swJD1bRnFeiX9vLA03Cvg2j7VQ0ZfecLTEhnI8ALPqSWz5LpjTBEMo MJV6ts5BVO6yuZ4dQ7OQIWRwtkRHyA5IFqqISn9SCh12l+XGblpsaIhGr09bkSVL+jtbVK 7ifY5JcLWhWriZpaukkgivkfBztPENo= 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-505-x0lSHKwiNkWjOzRbOYRvKg-1; Tue, 08 Sep 2020 02:39:46 -0400 X-MC-Unique: x0lSHKwiNkWjOzRbOYRvKg-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 B5988800688; Tue, 8 Sep 2020 06:39:44 +0000 (UTC) Received: from gondolin (ovpn-112-243.ams2.redhat.com [10.36.112.243]) by smtp.corp.redhat.com (Postfix) with ESMTP id 493B927BCD; Tue, 8 Sep 2020 06:39:40 +0000 (UTC) Date: Tue, 8 Sep 2020 08:39:37 +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 2/2] s390x: Add 3f program exception handler Message-ID: <20200908083937.5eae4a4b.cohuck@redhat.com> In-Reply-To: <20200907124700.10374-3-frankja@linux.ibm.com> References: <20200907124700.10374-1-frankja@linux.ibm.com> <20200907124700.10374-3-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 10.5.11.23 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Mon, 7 Sep 2020 08:47:00 -0400 Janosch Frank wrote: > Program exception 3f (secure storage violation) can only be detected > when the CPU is running in SIE with a format 4 state description, > e.g. running a protected guest. Because of this and because user > space partly controls the guest memory mapping and can trigger this > exception, we want to send a SIGSEGV to the process running the guest > and not panic the kernel. > > Signed-off-by: Janosch Frank > CC: # 5.7+ > Fixes: 084ea4d611a3 ("s390/mm: add (non)secure page access exceptions handlers") > Reviewed-by: Claudio Imbrenda > Acked-by: Christian Borntraeger > --- > arch/s390/kernel/pgm_check.S | 2 +- > arch/s390/mm/fault.c | 20 ++++++++++++++++++++ > 2 files changed, 21 insertions(+), 1 deletion(-) Reviewed-by: Cornelia Huck