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_PASS, URIBL_BLOCKED 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 6B1F5C76186 for ; Wed, 17 Jul 2019 10:37:03 +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 42B59217F9 for ; Wed, 17 Jul 2019 10:37:03 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 42B59217F9 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]:55798 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hnhJ0-0005Hf-Il for qemu-devel@archiver.kernel.org; Wed, 17 Jul 2019 06:37:02 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:55979) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hnhI6-00029E-O7 for qemu-devel@nongnu.org; Wed, 17 Jul 2019 06:36:07 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hnhI5-0001b8-DG for qemu-devel@nongnu.org; Wed, 17 Jul 2019 06:36:06 -0400 Received: from mx1.redhat.com ([209.132.183.28]:51038) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hnhI5-0001ai-7U; Wed, 17 Jul 2019 06:36:05 -0400 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 mx1.redhat.com (Postfix) with ESMTPS id 858C53092657; Wed, 17 Jul 2019 10:36:04 +0000 (UTC) Received: from t460s.redhat.com (ovpn-117-65.ams2.redhat.com [10.36.117.65]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0376519C70; Wed, 17 Jul 2019 10:36:02 +0000 (UTC) From: David Hildenbrand To: qemu-devel@nongnu.org Date: Wed, 17 Jul 2019 12:35:50 +0200 Message-Id: <20190717103550.24657-4-david@redhat.com> In-Reply-To: <20190717103550.24657-1-david@redhat.com> References: <20190717103550.24657-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.43]); Wed, 17 Jul 2019 10:36:04 +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-for-4.1 v2 3/3] virtio-balloon: reset pbp on device resets 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: "Michael S . Tsirkin" , David Hildenbrand , qemu-stable@nongnu.org, Stefan Hajnoczi , Igor Mammedov , David Gibson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" When a guest reboots (ordinary reboots, but also via kexec), it will happily reuse any system memory, including previously inflated memory. We could have tracking data for a pbp (PartiallyBalloonedPage). It could happen that a new inflation request from the guest will result in a discard of such a pbp, although the guest is (again) reusing some memory. We should reset the pbp on any device resets. Fixes: ed48c59875b6 ("virtio-balloon: Safely handle BALLOON_PAGE_SIZE < host page size") Cc: qemu-stable@nongnu.org #v4.0.0 Cc: Stefan Hajnoczi Cc: David Gibson Cc: Michael S. Tsirkin Cc: Igor Mammedov Signed-off-by: David Hildenbrand --- hw/virtio/virtio-balloon.c | 1 + 1 file changed, 1 insertion(+) diff --git a/hw/virtio/virtio-balloon.c b/hw/virtio/virtio-balloon.c index 84d01bceb3..9de3c030bf 100644 --- a/hw/virtio/virtio-balloon.c +++ b/hw/virtio/virtio-balloon.c @@ -847,6 +847,7 @@ static void virtio_balloon_device_reset(VirtIODevice = *vdev) if (virtio_balloon_free_page_support(s)) { virtio_balloon_free_page_stop(s); } + virtio_balloon_reset_pbp(s); =20 if (s->stats_vq_elem !=3D NULL) { virtqueue_unpop(s->svq, s->stats_vq_elem, 0); --=20 2.21.0