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=-6.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 3721BC43331 for ; Fri, 6 Sep 2019 08:20:38 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 19F7E207FC for ; Fri, 6 Sep 2019 08:20:38 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 19F7E207FC Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:53406 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1i69Tx-0003wF-8x for qemu-devel@archiver.kernel.org; Fri, 06 Sep 2019 04:20:37 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:42566) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1i6995-0004QB-L5 for qemu-devel@nongnu.org; Fri, 06 Sep 2019 03:59:07 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1i6992-0003j0-Hl for qemu-devel@nongnu.org; Fri, 06 Sep 2019 03:59:03 -0400 Received: from mx1.redhat.com ([209.132.183.28]:58692) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1i6991-0003gu-WC; Fri, 06 Sep 2019 03:59:00 -0400 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 mx1.redhat.com (Postfix) with ESMTPS id 27DB610C6964; Fri, 6 Sep 2019 07:58:58 +0000 (UTC) Received: from t460s.redhat.com (ovpn-117-162.ams2.redhat.com [10.36.117.162]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7C4751000321; Fri, 6 Sep 2019 07:58:56 +0000 (UTC) From: David Hildenbrand To: qemu-devel@nongnu.org Date: Fri, 6 Sep 2019 09:57:48 +0200 Message-Id: <20190906075750.14791-27-david@redhat.com> In-Reply-To: <20190906075750.14791-1-david@redhat.com> References: <20190906075750.14791-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.6.2 (mx1.redhat.com [10.5.110.65]); Fri, 06 Sep 2019 07:58:58 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v2 26/28] s390x/tcg: MVST: Fault-safe handling X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Florian Weimer , Thomas Huth , David Hildenbrand , Cornelia Huck , Stefano Brivio , qemu-s390x@nongnu.org, Richard Henderson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Access at most single pages and document why. Using the access helpers might over-indicate watchpoints within the same page, I guess we can live with that. Signed-off-by: David Hildenbrand --- target/s390x/mem_helper.c | 23 ++++++++++++++++------- 1 file changed, 16 insertions(+), 7 deletions(-) diff --git a/target/s390x/mem_helper.c b/target/s390x/mem_helper.c index 4c67c6f37e..73b00b582b 100644 --- a/target/s390x/mem_helper.c +++ b/target/s390x/mem_helper.c @@ -845,21 +845,30 @@ uint32_t HELPER(mvst)(CPUS390XState *env, uint64_t = c, uint32_t r1, uint32_t r2) { const uint64_t d =3D get_address(env, r1); const uint64_t s =3D get_address(env, r2); + const int len =3D MIN(-(d | TARGET_PAGE_MASK), -(s | TARGET_PAGE_MAS= K)); + S390Access srca, desta; uintptr_t ra =3D GETPC(); - uint32_t len; + int i; =20 if (c & 0xffffff00ull) { s390_program_interrupt(env, PGM_SPECIFICATION, ILEN_AUTO, ra); } c =3D c & 0xff; =20 - /* Lest we fail to service interrupts in a timely manner, limit the - amount of work we're willing to do. For now, let's cap at 8k. *= / - for (len =3D 0; len < 0x2000; ++len) { - uint8_t v =3D cpu_ldub_data_ra(env, s + len, ra); - cpu_stb_data_ra(env, d + len, v, ra); + /* + * Our access should not exceed single pages, as we must not report = access + * exceptions exceeding the actually copied range (which we don't kn= ow at + * this point). We might over-indicate watchpoints within the pages + * (if we ever care, we have to limit processing to a single byte). + */ + srca =3D access_prepare(env, s, len, MMU_DATA_LOAD, ra); + desta =3D access_prepare(env, d, len, MMU_DATA_STORE, ra); + for (i =3D 0; i < len; i++) { + const uint8_t v =3D access_get_byte(env, &srca, i, ra); + + access_set_byte(env, &desta, i, v, ra); if (v =3D=3D c) { - set_address_zero(env, r1, d + len); + set_address_zero(env, r1, d + i); return 1; } } --=20 2.21.0