From nobody Fri Nov 14 16:37:26 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1588758694; cv=none; d=zohomail.com; s=zohoarc; b=lL8vacN8DV+yb/Z9lrbQGyRscGLRrNkmsrYSgZml68LUVmvmMjK3l0clJGi2XhBuwv1aq7qMulZTvGa4IaHgbVP5+THC8uFAE6L7yqXcXxuPIufu7YfOVntl2Wlu5Ld1szyx5sAp9QxLkiXw2XO3T+0MMPRk2m8Z+coyK2TRBLY= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1588758694; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=1b7WzEdOr0opnS44tYvGmSayhyE3oXt+X3RgB8uyQ/4=; b=TIAhVAYHyZujytxUFvwd3knEc6/vnT/G+P8AzfhhhDUhgMVWpnhXlRLnpVoi2KQdGk0sEQJwMDEEcoV+WHUknNoAdcxqlNDqBx0LEbGhqL2otW+DvEGMxdHmnwFKlh+yqN78mq6fLGT3JkCzaqeBVW0EXPnOzXlCPQXgWMOUBno= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1588758694332781.2141266856144; Wed, 6 May 2020 02:51:34 -0700 (PDT) Received: from localhost ([::1]:49530 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jWGiD-0005xX-2A for importer@patchew.org; Wed, 06 May 2020 05:51:33 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:54066) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jWGgs-0004c4-C4 for qemu-devel@nongnu.org; Wed, 06 May 2020 05:50:10 -0400 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:20482 helo=us-smtp-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1jWGgr-0003Qw-50 for qemu-devel@nongnu.org; Wed, 06 May 2020 05:50:10 -0400 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-287-tQp4UaSBNF61XvzTMO_hOA-1; Wed, 06 May 2020 05:50:06 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 99C2C835B44; Wed, 6 May 2020 09:50:05 +0000 (UTC) Received: from t480s.redhat.com (ovpn-113-17.ams2.redhat.com [10.36.113.17]) by smtp.corp.redhat.com (Postfix) with ESMTP id D68BA5C1D4; Wed, 6 May 2020 09:50:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1588758608; 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: in-reply-to:in-reply-to:references:references; bh=1b7WzEdOr0opnS44tYvGmSayhyE3oXt+X3RgB8uyQ/4=; b=PEybXLPzyCAXbc0VPHNSmX4nyPKA9AIDQDyvs+FYMXf8oLwjU3hmQ5nnxuzlHYhMfjGnUo oPIFlxXn12O2P5lQ7GvMxly7eJEVKGhNSfc0P0hcn0nOb3H5wnzB0cz6gTdNTTPdUz7lOu RPZ8MxhsWZN4BLOVyY67FFmvgxAw6UU= X-MC-Unique: tQp4UaSBNF61XvzTMO_hOA-1 From: David Hildenbrand To: qemu-devel@nongnu.org Subject: [PATCH v1 01/17] exec: Introduce ram_block_discard_set_(unreliable|required)() Date: Wed, 6 May 2020 11:49:32 +0200 Message-Id: <20200506094948.76388-2-david@redhat.com> In-Reply-To: <20200506094948.76388-1-david@redhat.com> References: <20200506094948.76388-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=207.211.31.120; envelope-from=david@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/05 23:48:07 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action 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: Eduardo Habkost , kvm@vger.kernel.org, "Michael S . Tsirkin" , David Hildenbrand , "Dr . David Alan Gilbert" , qemu-s390x@nongnu.org, Paolo Bonzini , Richard Henderson Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" We want to replace qemu_balloon_inhibit() by something more generic. Especially, we want to make sure that technologies that really rely on RAM block discards to work reliably to run mutual exclusive with technologies that break it. E.g., vfio will usually pin all guest memory, turning the virtio-balloon basically useless and make the VM consume more memory than reported via the balloon. While the balloon is special already (=3D> no guarantees, same behavior possible afer reboots and with huge pages), this will be different, especially, with virtio-mem. Let's implement a way such that we can make both types of technology run mutually exclusive. We'll convert existing balloon inhibitors in successive patches and add some new ones. Add the check to qemu_balloon_is_inhibited() for now. We might want to make virtio-balloon an acutal inhibitor in the future - however, that requires more thought to not break existing setups. Cc: "Michael S. Tsirkin" Cc: Richard Henderson Cc: Paolo Bonzini Signed-off-by: David Hildenbrand Reviewed-by: Dr. David Alan Gilbert --- balloon.c | 3 ++- exec.c | 48 +++++++++++++++++++++++++++++++++++++++++++ include/exec/memory.h | 41 ++++++++++++++++++++++++++++++++++++ 3 files changed, 91 insertions(+), 1 deletion(-) diff --git a/balloon.c b/balloon.c index f104b42961..c49f57c27b 100644 --- a/balloon.c +++ b/balloon.c @@ -40,7 +40,8 @@ static int balloon_inhibit_count; =20 bool qemu_balloon_is_inhibited(void) { - return atomic_read(&balloon_inhibit_count) > 0; + return atomic_read(&balloon_inhibit_count) > 0 || + ram_block_discard_is_broken(); } =20 void qemu_balloon_inhibit(bool state) diff --git a/exec.c b/exec.c index 2874bb5088..52a6e40e99 100644 --- a/exec.c +++ b/exec.c @@ -4049,4 +4049,52 @@ void mtree_print_dispatch(AddressSpaceDispatch *d, M= emoryRegion *root) } } =20 +static int ram_block_discard_broken; + +int ram_block_discard_set_broken(bool state) +{ + int old; + + if (!state) { + atomic_dec(&ram_block_discard_broken); + return 0; + } + + do { + old =3D atomic_read(&ram_block_discard_broken); + if (old < 0) { + return -EBUSY; + } + } while (atomic_cmpxchg(&ram_block_discard_broken, old, old + 1) !=3D = old); + return 0; +} + +int ram_block_discard_set_required(bool state) +{ + int old; + + if (!state) { + atomic_inc(&ram_block_discard_broken); + return 0; + } + + do { + old =3D atomic_read(&ram_block_discard_broken); + if (old > 0) { + return -EBUSY; + } + } while (atomic_cmpxchg(&ram_block_discard_broken, old, old - 1) !=3D = old); + return 0; +} + +bool ram_block_discard_is_broken(void) +{ + return atomic_read(&ram_block_discard_broken) > 0; +} + +bool ram_block_discard_is_required(void) +{ + return atomic_read(&ram_block_discard_broken) < 0; +} + #endif diff --git a/include/exec/memory.h b/include/exec/memory.h index e000bd2f97..9bb5ced38d 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -2463,6 +2463,47 @@ static inline MemOp devend_memop(enum device_endian = end) } #endif =20 +/* + * Inhibit technologies that rely on discarding of parts of RAM blocks to = work + * reliably, e.g., to manage the actual amount of memory consumed by the VM + * (then, the memory provided by RAM blocks might be bigger than the desir= ed + * memory consumption). This *must* be set if: + * - Discarding parts of a RAM blocks does not result in the change being + * reflected in the VM and the pages getting freed. + * - All memory in RAM blocks is pinned or duplicated, invaldiating any pr= evious + * discards blindly. + * - Discarding parts of a RAM blocks will result in integrity issues (e.g= ., + * encrypted VMs). + * Technologies that only temporarily pin the current working set of a + * driver are fine, because we don't expect such pages to be discarded + * (esp. based on guest action like balloon inflation). + * + * This is *not* to be used to protect from concurrent discards (esp., + * postcopy). + * + * Returns 0 if successful. Returns -EBUSY if a technology that relies on + * discards to work reliably is active. + */ +int ram_block_discard_set_broken(bool state); + +/* + * Inhibit technologies that will break discarding of pages in RAM blocks. + * + * Returns 0 if successful. Returns -EBUSY if discards are already set to + * broken. + */ +int ram_block_discard_set_required(bool state); + +/* + * Test if discarding of memory in ram blocks is broken. + */ +bool ram_block_discard_is_broken(void); + +/* + * Test if discarding of memory in ram blocks is required to work reliably. + */ +bool ram_block_discard_is_required(void); + #endif =20 #endif --=20 2.25.3