From patchwork Mon Jan 24 17:17:01 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jonathan Cameron X-Patchwork-Id: 12722550 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2011FC433F5 for ; Mon, 24 Jan 2022 17:36:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244443AbiAXRgd (ORCPT ); Mon, 24 Jan 2022 12:36:33 -0500 Received: from frasgout.his.huawei.com ([185.176.79.56]:4484 "EHLO frasgout.his.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235334AbiAXRgd (ORCPT ); Mon, 24 Jan 2022 12:36:33 -0500 Received: from fraeml740-chm.china.huawei.com (unknown [172.18.147.200]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4JjHBX5Rcgz67vYh; Tue, 25 Jan 2022 01:33:08 +0800 (CST) Received: from lhreml710-chm.china.huawei.com (10.201.108.61) by fraeml740-chm.china.huawei.com (10.206.15.221) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.21; Mon, 24 Jan 2022 18:36:31 +0100 Received: from SecurePC-101-06.china.huawei.com (10.122.247.231) by lhreml710-chm.china.huawei.com (10.201.108.61) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.21; Mon, 24 Jan 2022 17:36:30 +0000 From: Jonathan Cameron To: , Marcel Apfelbaum , "Michael S . Tsirkin" , Igor Mammedov CC: , Ben Widawsky , =?utf-8?q?Alex_Benn=C3=A9e?= , Peter Maydell , , Shameerali Kolothum Thodi , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Saransh Gupta1 , Shreyas Shah , Chris Browy , Samarth Saxena , "Dan Williams" Subject: [PATCH v4 38/42] RFC: softmmu/memory: Add ops to memory_region_ram_init_from_file Date: Mon, 24 Jan 2022 17:17:01 +0000 Message-ID: <20220124171705.10432-39-Jonathan.Cameron@huawei.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220124171705.10432-1-Jonathan.Cameron@huawei.com> References: <20220124171705.10432-1-Jonathan.Cameron@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.122.247.231] X-ClientProxiedBy: lhreml740-chm.china.huawei.com (10.201.108.190) To lhreml710-chm.china.huawei.com (10.201.108.61) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-cxl@vger.kernel.org From: Jonathan Cameron Inorder to implement memory interleaving we need a means to proxy the calls. Adding mem_ops allows such proxying. Note should have no impact on use cases not using _dispatch_read/write. For now, only file backed hostmem is considered to seek feedback on the approach before considering other hostmem backends. Signed-off-by: Jonathan Cameron --- softmmu/memory.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/softmmu/memory.c b/softmmu/memory.c index 678dc62f06..d537091c63 100644 --- a/softmmu/memory.c +++ b/softmmu/memory.c @@ -1606,6 +1606,15 @@ void memory_region_init_ram_from_file(MemoryRegion *mr, Error *err = NULL; memory_region_init(mr, owner, name, size); mr->ram = true; + + /* + * ops used only when directly accessing via + * - memory_region_dispatch_read() + * - memory_region_dispatch_write() + */ + mr->ops = &ram_device_mem_ops; + mr->opaque = mr; + mr->readonly = readonly; mr->terminates = true; mr->destructor = memory_region_destructor_ram;