From patchwork Wed Apr 8 22:55:23 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Duyck X-Patchwork-Id: 1268385 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20161025 header.b=LhAFwM4a; dkim-atps=neutral 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 ozlabs.org (Postfix) with ESMTPS id 48yKR92Dm0z9sRN for ; Thu, 9 Apr 2020 08:57:09 +1000 (AEST) Received: from localhost ([::1]:41276 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jMJd4-0002x8-UX for incoming@patchwork.ozlabs.org; Wed, 08 Apr 2020 18:57:06 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:53493) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jMJbT-0000YW-BA for qemu-devel@nongnu.org; Wed, 08 Apr 2020 18:55:29 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1jMJbS-0001Jj-35 for qemu-devel@nongnu.org; Wed, 08 Apr 2020 18:55:27 -0400 Received: from mail-pf1-x442.google.com ([2607:f8b0:4864:20::442]:38972) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1jMJbR-0001JL-T5 for qemu-devel@nongnu.org; Wed, 08 Apr 2020 18:55:26 -0400 Received: by mail-pf1-x442.google.com with SMTP id k15so3150817pfh.6 for ; Wed, 08 Apr 2020 15:55:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:from:to:cc:date:message-id:in-reply-to:references :user-agent:mime-version:content-transfer-encoding; bh=IOMlbjfXWuE+0u1ners+vpffTKgzzJDssD1Ouo69X0c=; b=LhAFwM4aCGpSxxCshU7Zfg64BFB9F27L0JucH8w+dt9Uwb0uE+X9qJH98HrrqfvKgG CKpEtypwUeAsuQAgTlDoy2NWi2LwUHmAl5kUgnYgTuSXdYAD/rmCBNXcUasSVHlGKz3t ie/fi7pYrywW/dsrpPTiTMBhwVCT3ijasqKqX651aTQb9IWhDcdJz2IqasWfjZDP2zwh Gpb9RGD2SDnWB+Mkf8uHvQclkqp/NUCbAED55mVhqmQwwNPiOsM56G9XgrmZcsqiZDJ7 nWuKQZXotUaa1D73SaJPlzaQ7YQ8iwXDVLoJho1hPsmXR7WzYQIfz9rPJwWtsKS+28pV kqaQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:from:to:cc:date:message-id:in-reply-to :references:user-agent:mime-version:content-transfer-encoding; bh=IOMlbjfXWuE+0u1ners+vpffTKgzzJDssD1Ouo69X0c=; b=k8KblQb7NcDAm2WirHUBRyVWCIjW35jh2sbZdYbQviEe4ofO0yqAqM98VACe9wk5CG nzMW0AGLx5Bp2/Q66jMVpTqsBjChCNyy4pFp/KiIhUSaEHYyoS+tL3vHeeVaL15MUJlg qLculI2TDebp41lCwrUXf5313NqaP0UZ+OhVtBf0NJV/Ei5COGNeo80OD4oM0EsCqDLV uzNp35DW14kQEXTAkByCWrtBicELjfEZsvUcZ8ur+TQup/UX08W3+4uj3v4So5towqLr j2G8BEh+ZaOqjUyD7wri0Z0BePq+nm/rGsmQDFEuIMfI/FyDAgs7w7EGdL1pftH/QB1N L3hQ== X-Gm-Message-State: AGi0PuYSKnvB0Ot370tbTwDLVjwfKhV4YGe1YhI+CEjGPKn3Q3Fr97zR PLFgUrZzYb18Vk5594QY2VU= X-Google-Smtp-Source: APiQypKrZ2uyBWMmsCGQE0B+HyeVZ6Jmpcf6wKIvD1X/N1KgcpxuDhA9d6fFi1oB63V3/9t1r5ibew== X-Received: by 2002:a63:4850:: with SMTP id x16mr9170021pgk.317.1586386524582; Wed, 08 Apr 2020 15:55:24 -0700 (PDT) Received: from localhost.localdomain ([2001:470:b:9c3:9e5c:8eff:fe4f:f2d0]) by smtp.gmail.com with ESMTPSA id z7sm516712pju.37.2020.04.08.15.55.24 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Wed, 08 Apr 2020 15:55:24 -0700 (PDT) Subject: [PATCH v18 QEMU 2/3] virtio-balloon: Add support for providing free page reports to host From: Alexander Duyck To: david@redhat.com, mst@redhat.com Date: Wed, 08 Apr 2020 15:55:23 -0700 Message-ID: <20200408225523.18764.86514.stgit@localhost.localdomain> In-Reply-To: <20200408225302.18764.209.stgit@localhost.localdomain> References: <20200408225302.18764.209.stgit@localhost.localdomain> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::442 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: virtio-dev@lists.oasis-open.org, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: Alexander Duyck Add support for the page reporting feature provided by virtio-balloon. Reporting differs from the regular balloon functionality in that is is much less durable than a standard memory balloon. Instead of creating a list of pages that cannot be accessed the pages are only inaccessible while they are being indicated to the virtio interface. Once the interface has acknowledged them they are placed back into their respective free lists and are once again accessible by the guest system. Unlike a standard balloon we don't inflate and deflate the pages. Instead we perform the reporting, and once the reporting is completed it is assumed that the page has been dropped from the guest and will be faulted back in the next time the page is accessed. This patch is a subset of the UAPI patch that was submitted for the Linux kernel. The original patch can be found at: https://lore.kernel.org/lkml/20200211224657.29318.68624.stgit@localhost.localdomain/ Signed-off-by: Alexander Duyck Signed-off-by: Alexander Duyck --- include/standard-headers/linux/virtio_balloon.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/standard-headers/linux/virtio_balloon.h b/include/standard-headers/linux/virtio_balloon.h index 9375ca2a70de..1c5f6d6f2de6 100644 --- a/include/standard-headers/linux/virtio_balloon.h +++ b/include/standard-headers/linux/virtio_balloon.h @@ -36,6 +36,7 @@ #define VIRTIO_BALLOON_F_DEFLATE_ON_OOM 2 /* Deflate balloon on OOM */ #define VIRTIO_BALLOON_F_FREE_PAGE_HINT 3 /* VQ to report free pages */ #define VIRTIO_BALLOON_F_PAGE_POISON 4 /* Guest is using page poisoning */ +#define VIRTIO_BALLOON_F_REPORTING 5 /* Page reporting virtqueue */ /* Size of a PFN in the balloon interface. */ #define VIRTIO_BALLOON_PFN_SHIFT 12