From patchwork Wed Apr 8 19:48:54 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Duyck X-Patchwork-Id: 11480733 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1B6B0112C for ; Wed, 8 Apr 2020 19:49:49 +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 E277E2075E for ; Wed, 8 Apr 2020 19:49:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="FSHTEzfD" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E277E2075E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:40032 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jMGho-0003C9-0u for patchwork-qemu-devel@patchwork.kernel.org; Wed, 08 Apr 2020 15:49:48 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:37218) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jMGh2-0001t2-Ng for qemu-devel@nongnu.org; Wed, 08 Apr 2020 15:49:02 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1jMGh0-0002ze-Ir for qemu-devel@nongnu.org; Wed, 08 Apr 2020 15:49:00 -0400 Received: from mail-qv1-xf42.google.com ([2607:f8b0:4864:20::f42]:42717) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1jMGgz-0002xd-EC for qemu-devel@nongnu.org; Wed, 08 Apr 2020 15:48:58 -0400 Received: by mail-qv1-xf42.google.com with SMTP id ca9so4314389qvb.9 for ; Wed, 08 Apr 2020 12:48:57 -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=FSHTEzfDUkxuEf+1W+sAmhhANtyGhE2YTFAJ7s6ItmMRQBRjeLfpNek7JbCxKqBOGl pZIBzW7H+HoqeC9ZRVanOA3vQZ/JwZ8gdTDutljLbjhbdpHkL0jNSLVNV+VXVnch+DlS VfxSLQDQFpL3+bgRMTao3XGBA4vPV9Zkfa8ASsf290XcKcc/EqNmUbJr7yCtkgVXtME5 RydLmrTqQIAG4+lc92eRht/UdPyrvHjB0PlN9Keg3B2Q+X/mhoqJCWrs9Gl/jnS5jh/h lG+4XcqwNqm+O6+ZsWzaLmzytGnz1F7XFwOouWvo3+kZjlVAlWU9/6LSI7rUSvHluM2H 4kuA== 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=N0fV1a6Pu/SS/0DCZw7ONG0Pxi8w/35MpREiSk4zbCtI8EEts+pCpPwseIJE53q5nb 76Kltq7xAaJsk9HVU5ghUMUJDebC8qONFeBX6B1uBLou/6dm4KwZKXELbItcUUqIaBqn lHKWkvx+jw3MNMaefhhGLZ8ugH2HLNyLGANZjjhQZSa8YkkyKtuRiz+RFRmydocBoNQE 7psVhURiT2yiJLxFpU3ITsRq9/uPIVuKenvrU0RgpRrZRylgFzkhJ1xsYK+4djEkEPJk u0YM/Q2uyM25laz+LkCtiMPcOr4kVesFOBkt6MrKC/PoWa7nYPNfJjR1SPRBYaI39bk+ yWbQ== X-Gm-Message-State: AGi0PuayjMSxStUvYjbNX9H5rvVjDx2IlWt5BpegOYm1qp0cv/No64EN L6RCtM+oyOgkGTa8e5N7Z5E= X-Google-Smtp-Source: APiQypLxqlqQbYr9Q/QLFHhDDdEyvKmib9sd99MAtR/9zYg8l14bZSWItjNRYdlySyIZEFfG0vRP+w== X-Received: by 2002:ad4:41c2:: with SMTP id a2mr8916779qvq.112.1586375336732; Wed, 08 Apr 2020 12:48:56 -0700 (PDT) Received: from localhost.localdomain ([2001:470:b:9c3:9e5c:8eff:fe4f:f2d0]) by smtp.gmail.com with ESMTPSA id t24sm5019928qkj.23.2020.04.08.12.48.55 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Wed, 08 Apr 2020 12:48:55 -0700 (PDT) Subject: [PATCH v17 RESUBMIT 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 12:48:54 -0700 Message-ID: <20200408194854.24143.51548.stgit@localhost.localdomain> In-Reply-To: <20200408194628.24143.51644.stgit@localhost.localdomain> References: <20200408194628.24143.51644.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::f42 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+patchwork-qemu-devel=patchwork.kernel.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 --- 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