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GET /api/patches/1839911/?format=api
{ "id": 1839911, "url": "http://patchwork.ozlabs.org/api/patches/1839911/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20230926185738.277351-19-david@redhat.com/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/projects/14/?format=api", "name": "QEMU Development", "link_name": "qemu-devel", "list_id": "qemu-devel.nongnu.org", "list_email": "qemu-devel@nongnu.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20230926185738.277351-19-david@redhat.com>", "list_archive_url": null, "date": "2023-09-26T18:57:38", "name": "[v4,18/18] virtio-mem: Mark memslot alias memory regions unmergeable", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "23cfc1af6b565d882d9f36dc6a1c941e7017af88", "submitter": { "id": 70402, "url": "http://patchwork.ozlabs.org/api/people/70402/?format=api", "name": "David Hildenbrand", "email": "david@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20230926185738.277351-19-david@redhat.com/mbox/", "series": [ { "id": 374991, "url": "http://patchwork.ozlabs.org/api/series/374991/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=374991", "date": "2023-09-26T18:57:23", "name": "virtio-mem: Expose device memory through multiple memslots", "version": 4, "mbox": "http://patchwork.ozlabs.org/series/374991/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/1839911/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/1839911/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=hR12PzKX;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)" ], "Received": [ "from lists.gnu.org (lists.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4Rw8Gw2MZfz1ynX\n\tfor <incoming@patchwork.ozlabs.org>; Wed, 27 Sep 2023 05:01:28 +1000 (AEST)", "from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from <qemu-devel-bounces@nongnu.org>)\n\tid 1qlDIJ-0002M2-UY; Tue, 26 Sep 2023 15:00:28 -0400", "from eggs.gnu.org ([2001:470:142:3::10])\n by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from <david@redhat.com>) id 1qlDI8-0001to-8e\n for qemu-devel@nongnu.org; Tue, 26 Sep 2023 15:00:16 -0400", "from us-smtp-delivery-124.mimecast.com ([170.10.129.124])\n by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from <david@redhat.com>) id 1qlDI4-0003Uq-Ix\n for qemu-devel@nongnu.org; Tue, 26 Sep 2023 15:00:15 -0400", "from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com\n [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS\n (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id\n us-mta-281-t_nnSmVvNL-nvOoa5tOcxg-1; Tue, 26 Sep 2023 15:00:07 -0400", "from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com\n [10.11.54.4])\n (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))\n (No client certificate requested)\n by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 1DE3E811E8E;\n Tue, 26 Sep 2023 19:00:07 +0000 (UTC)", "from t14s.fritz.box (unknown [10.39.192.33])\n by smtp.corp.redhat.com (Postfix) with ESMTP id B9B372026D4B;\n Tue, 26 Sep 2023 19:00:02 +0000 (UTC)" ], "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com;\n s=mimecast20190719; t=1695754811;\n h=from:from:reply-to:subject:subject:date:date:message-id:message-id:\n to:to:cc:cc:mime-version:mime-version:content-type:content-type:\n content-transfer-encoding:content-transfer-encoding:\n in-reply-to:in-reply-to:references:references;\n bh=jAvglJj91/o8R3ulPUvMP06jx5ezTDNURc+rL2BIGo4=;\n b=hR12PzKXXvgb//rP8/f7FQccH0FZyKQbaawQnhzy2V+TVcxtJRRVw2KKXx+SYqNZOyT8Ro\n 5EE4TTfACEKDkiFVFP0UbCGnrIPUetn+m6flyA9GOQMdfJ+qEczZxyWzHo4ju6C7Z+Qs/v\n KcrmJg5mJ+eLK0qbyMEAxfuXirZxXhg=", "X-MC-Unique": "t_nnSmVvNL-nvOoa5tOcxg-1", "From": "David Hildenbrand <david@redhat.com>", "To": "qemu-devel@nongnu.org", "Cc": "David Hildenbrand <david@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>,\n Igor Mammedov <imammedo@redhat.com>,\n Xiao Guangrong <xiaoguangrong.eric@gmail.com>,\n \"Michael S. Tsirkin\" <mst@redhat.com>, Peter Xu <peterx@redhat.com>,\n\t=?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= <philmd@linaro.org>,\n Eduardo Habkost <eduardo@habkost.net>,\n Marcel Apfelbaum <marcel.apfelbaum@gmail.com>,\n Yanan Wang <wangyanan55@huawei.com>, Michal Privoznik <mprivozn@redhat.com>,\n\t=?utf-8?q?Daniel_P_=2E_Berrang=C3=A9?= <berrange@redhat.com>,\n Gavin Shan <gshan@redhat.com>, Alex Williamson <alex.williamson@redhat.com>,\n Stefan Hajnoczi <stefanha@redhat.com>,\n \"Maciej S . Szmigiero\" <mail@maciej.szmigiero.name>, kvm@vger.kernel.org", "Subject": "[PATCH v4 18/18] virtio-mem: Mark memslot alias memory regions\n unmergeable", "Date": "Tue, 26 Sep 2023 20:57:38 +0200", "Message-ID": "<20230926185738.277351-19-david@redhat.com>", "In-Reply-To": "<20230926185738.277351-1-david@redhat.com>", "References": "<20230926185738.277351-1-david@redhat.com>", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=UTF-8", "Content-Transfer-Encoding": "8bit", "X-Scanned-By": "MIMEDefang 3.1 on 10.11.54.4", "Received-SPF": "pass client-ip=170.10.129.124; envelope-from=david@redhat.com;\n helo=us-smtp-delivery-124.mimecast.com", "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,\n DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001,\n 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": "2.1.29", "Precedence": "list", "List-Id": "<qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "Let's mark the memslot alias memory regions as unmergable, such that\nflatview and vhost won't merge adjacent memory region aliases and we can\natomically map/unmap individual aliases without affecting adjacent\nalias memory regions.\n\nThis handles vhost and vfio in multiple-memslot mode correctly (which do\nnot support atomic memslot updates) and avoids the temporary removal of\nlarge memslots, which can be an expensive operation. For example, vfio\nmight have to unpin + repin a lot of memory, which is undesired.\n\nReviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>\nSigned-off-by: David Hildenbrand <david@redhat.com>\n---\n hw/virtio/virtio-mem.c | 6 ++++++\n 1 file changed, 6 insertions(+)", "diff": "diff --git a/hw/virtio/virtio-mem.c b/hw/virtio/virtio-mem.c\nindex e1e4250e69..9dc3c61b5a 100644\n--- a/hw/virtio/virtio-mem.c\n+++ b/hw/virtio/virtio-mem.c\n@@ -940,6 +940,12 @@ static void virtio_mem_prepare_memslots(VirtIOMEM *vmem)\n memory_region_init_alias(&vmem->memslots[idx], OBJECT(vmem), name,\n &vmem->memdev->mr, memslot_offset,\n memslot_size);\n+ /*\n+ * We want to be able to atomically and efficiently activate/deactivate\n+ * individual memslots without affecting adjacent memslots in memory\n+ * notifiers.\n+ */\n+ memory_region_set_unmergeable(&vmem->memslots[idx], true);\n }\n }\n \n", "prefixes": [ "v4", "18/18" ] }