From patchwork Thu Oct 8 08:30:23 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 271841 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=-3.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS autolearn=no 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 B4893C43467 for ; Thu, 8 Oct 2020 08:32:27 +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 279B4215A4 for ; Thu, 8 Oct 2020 08:32:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="fHOHFTUy" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 279B4215A4 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]:57272 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kQRLe-0008NP-4P for qemu-devel@archiver.kernel.org; Thu, 08 Oct 2020 04:32:26 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:42800) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kQRK3-0007HK-85 for qemu-devel@nongnu.org; Thu, 08 Oct 2020 04:30:47 -0400 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:42511) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kQRK1-0006NH-6f for qemu-devel@nongnu.org; Thu, 08 Oct 2020 04:30:46 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1602145842; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=FTmMH04fqsaRqzPsj6E9qcOHdzljqjQWvgI/t4Jka8M=; b=fHOHFTUyf1aFdO64/0FYHENOItV2NP24o/ronoiJhbLvnHqooLI7mpiCDenkKbgx5L9vU/ WTuJHbAcjnB59FGqSKg90fso1DoYTKre60bPU/+HQXgPHm/iqsWMONXK4swi9fkKqHtEVT p776Cp9zdblTlQrbOzbLNucW/vlWE40= 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-18-ed-w1e0TNF2wHG0n_4DgyQ-1; Thu, 08 Oct 2020 04:30:39 -0400 X-MC-Unique: ed-w1e0TNF2wHG0n_4DgyQ-1 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 1125B101FFA2; Thu, 8 Oct 2020 08:30:38 +0000 (UTC) Received: from t480s.redhat.com (ovpn-114-112.ams2.redhat.com [10.36.114.112]) by smtp.corp.redhat.com (Postfix) with ESMTP id F2D645C1BD; Thu, 8 Oct 2020 08:30:30 +0000 (UTC) From: David Hildenbrand To: qemu-devel@nongnu.org Subject: [PATCH v3 0/6] virtio-mem: block size and address-assignment optimizations Date: Thu, 8 Oct 2020 10:30:23 +0200 Message-Id: <20201008083029.9504-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=david@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=63.128.21.124; envelope-from=david@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/08 01:56:49 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.742, 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_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no 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: Pankaj Gupta , "Michael S. Tsirkin" , David Hildenbrand , "Dr. David Alan Gilbert" , Wei Yang , Igor Mammedov Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Let's try to detect the actual THP size and use it as default block size (unless the page size of the backend indicates that THP don't apply). Always allow to set a block size of 1 MiB, but warn if the configured block size is smaller than the default. Handle large block sizes better, avoiding a virtio-spec violation and optimizing address auto-detection. For existing setups (x86-64), the default block size won't change (was, and will be 2 MiB on anonymous memory). For existing x86-64 setups, the address auto-detection won't change in relevant setups (esp., anonymous memory and hugetlbfs with 2 MiB pages and no manual configuration of the block size). I don't see the need for compatibility handling (especially, as virtio-mem is still not considered production-ready). Most of this is a preparation for future architectures, using hugetlbfs to full extend, and using manually configured, larger block sizes (relevant for vfio in the future). v1 -> v2: - Reordered patches to have fixes upfront - Tweaked some patch descriptions - "virtio-mem: Check that "memaddr" is multiples of the block size" -- Renamed to "virtio-mem: Make sure "addr" is always multiples of the block size" - "virtio-mem: Make sure "usable_region_size" is always multiples of the block size" -- Added v1 -> v2: - Tweak some patch descriptions - "virtio-mem: Probe THP size to determine default block size" -- Beautify THP detection a bit. -- Assume THP might only get used if the memory backend page size corresponds to the real hostpage size. -- Use virtio_mem_default_block_size(RAMBlock *rb) to handle selection of the default block size for a RAMBlock. -- Implement virtio_mem_get_block_size() as preparation for patch #5 - "memory-device: Add get_min_alignment() callback" -- Simplify documentation. - "virito-mem: Implement get_min_alignment()" -- Simplify due to changes in patch #1. David Hildenbrand (6): virtio-mem: Make sure "addr" is always multiples of the block size virtio-mem: Make sure "usable_region_size" is always multiples of the block size virtio-mem: Probe THP size to determine default block size memory-device: Support big alignment requirements memory-device: Add get_min_alignment() callback virito-mem: Implement get_min_alignment() hw/mem/memory-device.c | 20 ++++-- hw/virtio/virtio-mem-pci.c | 7 ++ hw/virtio/virtio-mem.c | 113 +++++++++++++++++++++++++++++++-- include/hw/mem/memory-device.h | 10 +++ 4 files changed, 140 insertions(+), 10 deletions(-)