From patchwork Tue May 25 14:28:02 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 12279113 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=-11.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,MIME_BASE64_TEXT,SPF_HELO_NONE,SPF_PASS 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 F1C76C2B9F8 for ; Tue, 25 May 2021 14:32:32 +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 99B9E6140B for ; Tue, 25 May 2021 14:32:32 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 99B9E6140B 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]:44454 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1llY6h-00023k-OP for qemu-devel@archiver.kernel.org; Tue, 25 May 2021 10:32:31 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:49296) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1llY30-0003ng-7W for qemu-devel@nongnu.org; Tue, 25 May 2021 10:28:42 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:21321) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1llY2v-00089u-Hj for qemu-devel@nongnu.org; Tue, 25 May 2021 10:28:41 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1621952916; 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=23O4rxiDH011Z16W0VTAiloRe5pkfPjYB7RF1gKOyJ0=; b=fgbQmZXjfsS/EMsRDoLZf5jhKHmynPPlFNKBaHUtsIy/y5zTWFrwluDAAyw/PLssnSMJyv 2sADR18DDNRljdG8MZsk5QoYJzCckjvWdHiZySPd7UgRTNjuEtP+o9Rg8YMDQWHlSuNZH3 f+agT4adbCnNrR16hpAk545910eqJWA= 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-543-dZBWk2wUPlm-uJAi1RPkIQ-1; Tue, 25 May 2021 10:28:35 -0400 X-MC-Unique: dZBWk2wUPlm-uJAi1RPkIQ-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 5246B107ACCD for ; Tue, 25 May 2021 14:28:33 +0000 (UTC) Received: from localhost (ovpn-115-80.ams2.redhat.com [10.36.115.80]) by smtp.corp.redhat.com (Postfix) with ESMTP id E0FEF5C1A1; Tue, 25 May 2021 14:28:32 +0000 (UTC) From: Stefan Hajnoczi To: qemu-devel@nongnu.org Subject: [PATCH v2 2/3] memory: add memory_region_is_mapped_shared() Date: Tue, 25 May 2021 15:28:02 +0100 Message-Id: <20210525142803.125401-3-stefanha@redhat.com> In-Reply-To: <20210525142803.125401-1-stefanha@redhat.com> References: <20210525142803.125401-1-stefanha@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=stefanha@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=216.205.24.124; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -13 X-Spam_score: -1.4 X-Spam_bar: - X-Spam_report: (-1.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.371, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, MIME_BASE64_TEXT=1.741, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=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: kwolf@redhat.com, Laurent Vivier , Thomas Huth , "Michael S. Tsirkin" , Stefan Hajnoczi , =?utf-8?q?Marc-Andr=C3=A9_Lureau?= , Paolo Bonzini Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Add a function to query whether a memory region is mmap(MAP_SHARED). This will be used to check that vhost-user memory regions can be shared with the device backend process in the next patch. An inline function in "exec/memory.h" would have been nice but RAMBlock fields are only accessible from memory.c (see "exec/ramblock.h"). Signed-off-by: Stefan Hajnoczi --- include/exec/memory.h | 11 +++++++++++ softmmu/memory.c | 6 ++++++ 2 files changed, 17 insertions(+) diff --git a/include/exec/memory.h b/include/exec/memory.h index c8b9088924..88dbcb69c4 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -2483,6 +2483,17 @@ static inline bool memory_access_is_direct(MemoryRegion *mr, bool is_write) } } +/** + * memory_region_is_mapped_shared: check whether a memory region is + * mmap(MAP_SHARED) + * + * Returns %true is a memory region is mmap(MAP_SHARED). This is always false + * on memory regions that do not support memory_region_get_ram_ptr(). + * + * @mr: the memory region being queried + */ +bool memory_region_is_mapped_shared(MemoryRegion *mr); + /** * address_space_read: read from an address space. * diff --git a/softmmu/memory.c b/softmmu/memory.c index 3bb533c0bc..7379d44d18 100644 --- a/softmmu/memory.c +++ b/softmmu/memory.c @@ -1808,6 +1808,12 @@ bool memory_region_is_ram_device(MemoryRegion *mr) return mr->ram_device; } +bool memory_region_is_mapped_shared(MemoryRegion *mr) +{ + return memory_access_is_direct(mr, false) && + (mr->ram_block->flags & RAM_SHARED); +} + uint8_t memory_region_get_dirty_log_mask(MemoryRegion *mr) { uint8_t mask = mr->dirty_log_mask;