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=-6.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, 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 364BAC41514 for ; Mon, 12 Aug 2019 21:33:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 03BE22085A for ; Mon, 12 Aug 2019 21:33:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="tcfg65az" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727665AbfHLVdx (ORCPT ); Mon, 12 Aug 2019 17:33:53 -0400 Received: from mail-pf1-f194.google.com ([209.85.210.194]:44276 "EHLO mail-pf1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727004AbfHLVdw (ORCPT ); Mon, 12 Aug 2019 17:33:52 -0400 Received: by mail-pf1-f194.google.com with SMTP id c81so1345210pfc.11; Mon, 12 Aug 2019 14:33:51 -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=N1FHoD6ZMNB/7wrUWG2IW6DScPoWU0//Swe9DNcA3ZM=; b=tcfg65azcnEOcAutLjCvNZczVJUNMSDMM22VOiQH6xAp2XF9FMR39o5JF5QZ+k3fZN UsYAExWzvam4SnvfjYbjqR5Os9bPK8cLarFAT2zfnVRIkUZHkoGBPnuemqxkOcZ+uODy LMqNJomcnrG8mTyJ5LG1xdc+WTAfaIliYA1eakM2CCpO1/yy4rP74lkJFkmjNFJBQCzV mDD77KiPxIz6bW8/WeTWXo+PHg/i0fvAcOqg7HSDkxhW963eneZxINqg7uqCV+GQPpS2 s2Mo2ErQ1ShcUV1Mg59dGDPgozPyqZqurNkonaPeNTf4sjwmwtRl6vaGtk4wvVbZO2o8 uk/w== 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=N1FHoD6ZMNB/7wrUWG2IW6DScPoWU0//Swe9DNcA3ZM=; b=VYbDI//HAI541XokDVAuf5zuXm4I8tTsIiJeb0ne55k15Rbta+2tvmrORddkVpwxTh f0O6ftGwGe9nBd1OpoR2V7Km8EfPZjAe4tVZbPrpjcMwYN9PEPsNjxAcCb4tm7LedvuR rmgb7WCYUnTM9Xg8Ki3j+i82nd0tTVTX+TnEdBu9cbt1+mm6+YiW2mNBi/MJe/yldIaF 0XsZv19EVDS8bpieVULsRJRfm0UZH5ccIOZsJph4cAT4A3k+3m+qAf8nI+j6GKJnFIqO feFxuncm5BK81PYFAtPYyGcFwSM9VgldeIJ9R83gJxTjKO0tVVmS9frRkvNIkZToudFZ QmDA== X-Gm-Message-State: APjAAAVisolBS5BD25a0io/7rsPJyNpDb6VvYE6rW7RTkV3tA8wxlaAb 2u1DUGPzIMZhCjhzOqvw35Q= X-Google-Smtp-Source: APXvYqy1oXUYIem6XzmDVe884Ah62EAzXq+JkK2Hx/bJix7QTYC22HN51FBb8N05a72ad6sHl3Ne+g== X-Received: by 2002:a17:90a:bb01:: with SMTP id u1mr1186109pjr.92.1565645631259; Mon, 12 Aug 2019 14:33:51 -0700 (PDT) Received: from localhost.localdomain ([2001:470:b:9c3:9e5c:8eff:fe4f:f2d0]) by smtp.gmail.com with ESMTPSA id 185sm116118013pfa.170.2019.08.12.14.33.50 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 12 Aug 2019 14:33:50 -0700 (PDT) Subject: [PATCH v5 5/6] virtio-balloon: Pull page poisoning config out of free page hinting From: Alexander Duyck To: nitesh@redhat.com, kvm@vger.kernel.org, mst@redhat.com, david@redhat.com, dave.hansen@intel.com, linux-kernel@vger.kernel.org, willy@infradead.org, mhocko@kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org, virtio-dev@lists.oasis-open.org, osalvador@suse.de Cc: yang.zhang.wz@gmail.com, pagupta@redhat.com, riel@surriel.com, konrad.wilk@oracle.com, lcapitulino@redhat.com, wei.w.wang@intel.com, aarcange@redhat.com, pbonzini@redhat.com, dan.j.williams@intel.com, alexander.h.duyck@linux.intel.com Date: Mon, 12 Aug 2019 14:33:50 -0700 Message-ID: <20190812213350.22097.3322.stgit@localhost.localdomain> In-Reply-To: <20190812213158.22097.30576.stgit@localhost.localdomain> References: <20190812213158.22097.30576.stgit@localhost.localdomain> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Alexander Duyck Currently the page poisoning setting wasn't being enabled unless free page hinting was enabled. However we will need the page poisoning tracking logic as well for unused page reporting. As such pull it out and make it a separate bit of config in the probe function. In addition we can actually wrap the code in a check for NO_SANITY. If we don't care what is actually in the page we can just default to 0 and leave it there. Signed-off-by: Alexander Duyck --- drivers/virtio/virtio_balloon.c | 19 +++++++++++++------ 1 file changed, 13 insertions(+), 6 deletions(-) diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c index 226fbb995fb0..2c19457ab573 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -842,7 +842,6 @@ static int virtio_balloon_register_shrinker(struct virtio_balloon *vb) static int virtballoon_probe(struct virtio_device *vdev) { struct virtio_balloon *vb; - __u32 poison_val; int err; if (!vdev->config->get) { @@ -909,11 +908,19 @@ static int virtballoon_probe(struct virtio_device *vdev) VIRTIO_BALLOON_CMD_ID_STOP); spin_lock_init(&vb->free_page_list_lock); INIT_LIST_HEAD(&vb->free_page_list); - if (virtio_has_feature(vdev, VIRTIO_BALLOON_F_PAGE_POISON)) { - memset(&poison_val, PAGE_POISON, sizeof(poison_val)); - virtio_cwrite(vb->vdev, struct virtio_balloon_config, - poison_val, &poison_val); - } + } + if (virtio_has_feature(vdev, VIRTIO_BALLOON_F_PAGE_POISON)) { + __u32 poison_val = 0; + +#if !defined(CONFIG_PAGE_POISONING_NO_SANITY) + /* + * Let hypervisor know that we are expecting a specific + * value to be written back in unused pages. + */ + memset(&poison_val, PAGE_POISON, sizeof(poison_val)); +#endif + virtio_cwrite(vb->vdev, struct virtio_balloon_config, + poison_val, &poison_val); } /* * We continue to use VIRTIO_BALLOON_F_DEFLATE_ON_OOM to decide if a