From nobody Mon Feb 9 17:25:30 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1626255188881691.9249734376381; Wed, 14 Jul 2021 02:33:08 -0700 (PDT) Received: from localhost ([::1]:37824 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m3bGN-0004M1-Nr for importer@patchew.org; Wed, 14 Jul 2021 05:33:07 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:33622) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m3bDy-00025J-6u for qemu-devel@nongnu.org; Wed, 14 Jul 2021 05:30:38 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:26985) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m3bDw-0000Ez-Bm for qemu-devel@nongnu.org; Wed, 14 Jul 2021 05:30:37 -0400 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-478-UpWIMsYMM8uQx3s-V_Prhg-1; Wed, 14 Jul 2021 05:30:34 -0400 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 8FDC7101F003 for ; Wed, 14 Jul 2021 09:30:33 +0000 (UTC) Received: from localhost (ovpn-112-200.ams2.redhat.com [10.36.112.200]) by smtp.corp.redhat.com (Postfix) with ESMTP id A5A9E26DC5; Wed, 14 Jul 2021 09:30:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1626255035; 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=oRAs9inLvqN32CDm3YvQbZuQXoq/BmR1BVABzfrIpR0=; b=EcCGZHK07L2Y2q41pEstdCKhf4PtRRhdHtVXh5JegE3HUEj0EbdxhlQS/nn2+LUosjqEIz qFC1ujaH0IU7cd22KPSOSk3afH2bDit3RXOFZwNJHETnl/a9wr8nmpKo2emjMQP9SiKxmI O3rrU+q9Jv22ybBValNn8eAl0WyYAFU= X-MC-Unique: UpWIMsYMM8uQx3s-V_Prhg-1 From: Stefan Hajnoczi To: qemu-devel@nongnu.org Subject: [PATCH v3 2/3] memory: add memory_region_is_mapped_shared() Date: Wed, 14 Jul 2021 10:29:45 +0100 Message-Id: <20210714092946.569516-3-stefanha@redhat.com> In-Reply-To: <20210714092946.569516-1-stefanha@redhat.com> References: <20210714092946.569516-1-stefanha@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=stefanha@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -17 X-Spam_score: -1.8 X-Spam_bar: - X-Spam_report: (-1.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.7, 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: Laurent Vivier , kwolf@redhat.com, Thomas Huth , "Michael S. Tsirkin" , Stefan Hajnoczi , Paolo Bonzini , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1626255190074100001 Content-Type: text/plain; charset="utf-8" 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 Reviewed-by: Pankaj Gupta --- 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 c3d417d317..5976f05a01 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -2763,6 +2763,17 @@ static inline bool memory_access_is_direct(MemoryReg= ion *mr, bool is_write) } } =20 +/** + * 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 fa= lse + * 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 bfedaf9c4d..3c4510c809 100644 --- a/softmmu/memory.c +++ b/softmmu/memory.c @@ -1811,6 +1811,12 @@ bool memory_region_is_ram_device(MemoryRegion *mr) return mr->ram_device; } =20 +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 =3D mr->dirty_log_mask; --=20 2.31.1