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=-6.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_NONE 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 500C1C32750 for ; Tue, 13 Aug 2019 13:43:04 +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 22B0120679 for ; Tue, 13 Aug 2019 13:43:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 22B0120679 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]:52508 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hxX4p-0004tP-B1 for qemu-devel@archiver.kernel.org; Tue, 13 Aug 2019 09:43:03 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:33314) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hxX4S-0004SF-56 for qemu-devel@nongnu.org; Tue, 13 Aug 2019 09:42:41 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hxX4R-0001bX-6u for qemu-devel@nongnu.org; Tue, 13 Aug 2019 09:42:40 -0400 Received: from mx1.redhat.com ([209.132.183.28]:43130) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hxX4R-0001b8-0s; Tue, 13 Aug 2019 09:42:39 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id F0A94315C027; Tue, 13 Aug 2019 13:42:37 +0000 (UTC) Received: from gondolin (dhcp-192-232.str.redhat.com [10.33.192.232]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7302960852; Tue, 13 Aug 2019 13:42:34 +0000 (UTC) Date: Tue, 13 Aug 2019 15:42:32 +0200 From: Cornelia Huck To: David Hildenbrand Message-ID: <20190813154232.0478c9d9.cohuck@redhat.com> In-Reply-To: <20190812112737.6652-4-david@redhat.com> References: <20190812112737.6652-1-david@redhat.com> <20190812112737.6652-4-david@redhat.com> Organization: Red Hat GmbH MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.41]); Tue, 13 Aug 2019 13:42:38 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: Re: [Qemu-devel] [PATCH-for-4.2 v1 3/6] s390x/tcg: Flush the TLB of all CPUs on SSKE and RRBE 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: Thomas Huth , Janosch Frank , qemu-devel@nongnu.org, Halil Pasic , Christian Borntraeger , qemu-s390x@nongnu.org, Richard Henderson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Mon, 12 Aug 2019 13:27:34 +0200 David Hildenbrand wrote: > Whenever we modify a storage key, we shuld flush the TLBs of all CPUs, > so the MMU fault handling code can properly consider the changed storage > key (to e.g., properly set the reference and change bit on the next > accesses). > > These functions are barely used in modern Linux guests, so the performance > implications are neglectable for now. > > This is a preparation for better reference and change bit handling for > TCG, which will require more MMU changes. > > Signed-off-by: David Hildenbrand > --- > target/s390x/mem_helper.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/target/s390x/mem_helper.c b/target/s390x/mem_helper.c > index 29d9eaa5b7..ed54265e03 100644 > --- a/target/s390x/mem_helper.c > +++ b/target/s390x/mem_helper.c > @@ -1815,6 +1815,8 @@ void HELPER(sske)(CPUS390XState *env, uint64_t r1, uint64_t r2) > > key = (uint8_t) r1; > skeyclass->set_skeys(ss, addr / TARGET_PAGE_SIZE, 1, &key); > + /* TODO: Flush only entries with this target address */ > + tlb_flush_all_cpus_synced(env_cpu(env)); > } > > /* reset reference bit extended */ > @@ -1843,6 +1845,8 @@ uint32_t HELPER(rrbe)(CPUS390XState *env, uint64_t r2) > if (skeyclass->set_skeys(ss, r2 / TARGET_PAGE_SIZE, 1, &key)) { > return 0; > } > + /* TODO: Flush only entries with this target address */ > + tlb_flush_all_cpus_synced(env_cpu(env)); > > /* > * cc Seems reasonable. Reviewed-by: Cornelia Huck