From nobody Thu Sep 19 01:08:04 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; 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=pass(p=none dis=none) header.from=nongnu.org ARC-Seal: i=1; a=rsa-sha256; t=1720179710; cv=none; d=zohomail.com; s=zohoarc; b=McBAYZf6oRtAmB+miPveo72un4CyT7F1rFyAaBR8jxyLxEWrMMu+3u92vEuKzpH63laQ70pAkBAOOpz00mFgn2yOF21SH3xsdhFcrEDXhDdmuc5lwql7UQogEOzmCxakIB9m3ldAJgFPEbbnTOvCmESwptUMp1Gq90WwauuEC8g= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1720179710; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:Reply-To:Reply-To:References:Sender:Subject:Subject:To:To:Message-Id; bh=EvGKvhpwb1yrIUBhZHyVVFwSh/1Yx0uuWr84I4ka6ME=; b=PL32RuEDGfzr5b9+9T3etHkAEkQdOkk9ujjCV1KI9Z6yji/1lm0hUTssueiz9Rvbetx1zw0u5/XPABSLIq5afmCx/st4BlT9qBu2t14l1QvUFKslENBzDlYUiziJA5jUZWOsefV+guOzAAKP2V4w8FyMd3MJ6DTw1oIrolEmL2A= ARC-Authentication-Results: i=1; mx.zohomail.com; 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=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1720179710974593.0067562886668; Fri, 5 Jul 2024 04:41:50 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sPhJx-0004VS-J2; Fri, 05 Jul 2024 07:41:45 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sPhJk-0004Fl-6H for qemu-devel@nongnu.org; Fri, 05 Jul 2024 07:41:35 -0400 Received: from frasgout.his.huawei.com ([185.176.79.56]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sPhJi-0007xK-JS for qemu-devel@nongnu.org; Fri, 05 Jul 2024 07:41:31 -0400 Received: from mail.maildlp.com (unknown [172.18.186.216]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4WFs5m69Hpz6JBWB; Fri, 5 Jul 2024 19:40:44 +0800 (CST) Received: from lhrpeml500005.china.huawei.com (unknown [7.191.163.240]) by mail.maildlp.com (Postfix) with ESMTPS id D6138140B18; Fri, 5 Jul 2024 19:41:28 +0800 (CST) Received: from SecurePC-101-06.china.huawei.com (10.122.19.247) by lhrpeml500005.china.huawei.com (7.191.163.240) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Fri, 5 Jul 2024 12:41:28 +0100 To: , CC: , Markus Armbruster , Li Zhijian , , Zhao Liu , Xingtao Yao Subject: [PATCH v2 3/3] hw/cxl: Check for multiple mappings of memory backends. Date: Fri, 5 Jul 2024 12:39:56 +0100 Message-ID: <20240705113956.941732-4-Jonathan.Cameron@huawei.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240705113956.941732-1-Jonathan.Cameron@huawei.com> References: <20240705113956.941732-1-Jonathan.Cameron@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.122.19.247] X-ClientProxiedBy: lhrpeml100003.china.huawei.com (7.191.160.210) To lhrpeml500005.china.huawei.com (7.191.163.240) 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=185.176.79.56; envelope-from=jonathan.cameron@huawei.com; helo=frasgout.his.huawei.com X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-to: Jonathan Cameron From: Jonathan Cameron via Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZM-MESSAGEID: 1720179712861100001 Content-Type: text/plain; charset="utf-8" Similar protection to that provided for -numa memdev=3Dx to make sure that memory used to back a type3 device is not also mapped as normal RAM, or for multiple type3 devices. This is an easy footgun to remove and seems multiple people have run into it. Signed-off-by: Jonathan Cameron --- hw/mem/cxl_type3.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/hw/mem/cxl_type3.c b/hw/mem/cxl_type3.c index 35ac59883a..e7fbbb4d51 100644 --- a/hw/mem/cxl_type3.c +++ b/hw/mem/cxl_type3.c @@ -737,6 +737,11 @@ static bool cxl_setup_memory(CXLType3Dev *ct3d, Error = **errp) error_setg(errp, "volatile memdev must have backing device"); return false; } + if (host_memory_backend_is_mapped(ct3d->hostvmem)) { + error_setg(errp, "memory backend %s can't be used multiple tim= es.", + object_get_canonical_path_component(OBJECT(ct3d->hostvmem))= ); + return false; + } memory_region_set_nonvolatile(vmr, false); memory_region_set_enabled(vmr, true); host_memory_backend_set_mapped(ct3d->hostvmem, true); @@ -760,6 +765,11 @@ static bool cxl_setup_memory(CXLType3Dev *ct3d, Error = **errp) error_setg(errp, "persistent memdev must have backing device"); return false; } + if (host_memory_backend_is_mapped(ct3d->hostpmem)) { + error_setg(errp, "memory backend %s can't be used multiple tim= es.", + object_get_canonical_path_component(OBJECT(ct3d->hostpmem))= ); + return false; + } memory_region_set_nonvolatile(pmr, true); memory_region_set_enabled(pmr, true); host_memory_backend_set_mapped(ct3d->hostpmem, true); @@ -790,6 +800,11 @@ static bool cxl_setup_memory(CXLType3Dev *ct3d, Error = **errp) return false; } =20 + if (host_memory_backend_is_mapped(ct3d->dc.host_dc)) { + error_setg(errp, "memory backend %s can't be used multiple tim= es.", + object_get_canonical_path_component(OBJECT(ct3d->dc.host_dc= ))); + return false; + } /* * Set DC regions as volatile for now, non-volatile support can * be added in the future if needed. --=20 2.43.0