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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 3B8B4C433EF for ; Tue, 30 Nov 2021 09:32:09 +0000 (UTC) Received: from localhost ([::1]:59904 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mrzUd-0008KS-Vj for qemu-devel@archiver.kernel.org; Tue, 30 Nov 2021 04:32:08 -0500 Received: from eggs.gnu.org ([209.51.188.92]:58282) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mrzSG-0006Ez-GN for qemu-devel@nongnu.org; Tue, 30 Nov 2021 04:29:41 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:22911) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mrzSE-0000al-Gn for qemu-devel@nongnu.org; Tue, 30 Nov 2021 04:29:40 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1638264577; 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: in-reply-to:in-reply-to:references:references; bh=vRA7XuPBOj8juu3qnljSk1SJXLL9sWXRx1Fh2OIwyFo=; b=cwoFbg5E5fNW+/g9QLGxvFoty1cD4hxoizYN12GXyMBcy0neKH8eAVLoamcyrEBDIaIbLb GdVi7lvp39acnnqLuIoSVf/KnDBHuthANgI8sGIH5kSjiDZiwYh5nGE1F52kYr0CMInokO S32qBplM9x0zvfvCxfCxNTLI8om/Wlc= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-478-a8ROGo0XNEuUpvR36Qq_AA-1; Tue, 30 Nov 2021 04:29:34 -0500 X-MC-Unique: a8ROGo0XNEuUpvR36Qq_AA-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 267B993920; Tue, 30 Nov 2021 09:29:33 +0000 (UTC) Received: from t480s.redhat.com (unknown [10.39.193.9]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4CA2E1972D; Tue, 30 Nov 2021 09:29:00 +0000 (UTC) From: David Hildenbrand To: qemu-devel@nongnu.org Subject: [PATCH v1 1/3] linux-headers: sync VIRTIO_MEM_F_UNPLUGGED_INACCESSIBLE Date: Tue, 30 Nov 2021 10:28:36 +0100 Message-Id: <20211130092838.24224-2-david@redhat.com> In-Reply-To: <20211130092838.24224-1-david@redhat.com> References: <20211130092838.24224-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 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 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="US-ASCII" Received-SPF: pass client-ip=170.10.133.124; envelope-from=david@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -34 X-Spam_score: -3.5 X-Spam_bar: --- X-Spam_report: (-3.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.716, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Pankaj Gupta , Gavin Shan , Eduardo Habkost , "Michael S. Tsirkin" , David Hildenbrand , Richard Henderson , Sebastien Boeuf , Paolo Bonzini , Hui Zhu Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" TODO: replace by a proper header sync. Signed-off-by: David Hildenbrand --- include/standard-headers/linux/virtio_mem.h | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/include/standard-headers/linux/virtio_mem.h b/include/standard-headers/linux/virtio_mem.h index 05e5ade75d..18c74c527c 100644 --- a/include/standard-headers/linux/virtio_mem.h +++ b/include/standard-headers/linux/virtio_mem.h @@ -68,9 +68,10 @@ * explicitly triggered (VIRTIO_MEM_REQ_UNPLUG). * * There are no guarantees what will happen if unplugged memory is - * read/written. Such memory should, in general, not be touched. E.g., - * even writing might succeed, but the values will simply be discarded at - * random points in time. + * read/written. In general, unplugged memory should not be touched, because + * the resulting action is undefined. There is one exception: without + * VIRTIO_MEM_F_UNPLUGGED_INACCESSIBLE, unplugged memory inside the usable + * region can be read, to simplify creation of memory dumps. * * It can happen that the device cannot process a request, because it is * busy. The device driver has to retry later. @@ -87,6 +88,8 @@ /* node_id is an ACPI PXM and is valid */ #define VIRTIO_MEM_F_ACPI_PXM 0 +/* unplugged memory must not be accessed */ +#define VIRTIO_MEM_F_UNPLUGGED_INACCESSIBLE 1 /* --- virtio-mem: guest -> host requests --- */ -- 2.31.1