From patchwork Thu Apr 18 07:36:51 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luca Fancellu X-Patchwork-Id: 13634295 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.xenproject.org (lists.xenproject.org [192.237.175.120]) (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 0ADFDC4345F for ; Thu, 18 Apr 2024 07:46:27 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.708080.1106676 (Exim 4.92) (envelope-from ) id 1rxMTK-00068w-7Y; Thu, 18 Apr 2024 07:46:18 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 708080.1106676; Thu, 18 Apr 2024 07:46:18 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1rxMTK-00068p-3V; Thu, 18 Apr 2024 07:46:18 +0000 Received: by outflank-mailman (input) for mailman id 708080; Thu, 18 Apr 2024 07:46:16 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1rxMKd-00046V-JA for xen-devel@lists.xenproject.org; Thu, 18 Apr 2024 07:37:19 +0000 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by se1-gles-flk1.inumbo.com (Halon) with ESMTP id 7b01e855-fd56-11ee-94a3-07e782e9044d; Thu, 18 Apr 2024 09:37:17 +0200 (CEST) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id B11731576; Thu, 18 Apr 2024 00:37:44 -0700 (PDT) Received: from e125770.cambridge.arm.com (e125770.arm.com [10.1.199.43]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id C42B53F64C; Thu, 18 Apr 2024 00:37:15 -0700 (PDT) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 7b01e855-fd56-11ee-94a3-07e782e9044d From: Luca Fancellu To: xen-devel@lists.xenproject.org Cc: Penny Zheng , Stefano Stabellini , Julien Grall , Bertrand Marquis , Michal Orzel , Volodymyr Babchuk , Penny Zheng Subject: [PATCH v3 11/12] xen/arm: fix duplicate /reserved-memory node in Dom0 Date: Thu, 18 Apr 2024 08:36:51 +0100 Message-Id: <20240418073652.3622828-12-luca.fancellu@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240418073652.3622828-1-luca.fancellu@arm.com> References: <20240418073652.3622828-1-luca.fancellu@arm.com> MIME-Version: 1.0 From: Penny Zheng In case there is a /reserved-memory node already present in the host dtb, current Xen codes would create yet another /reserved-memory node when the static shared memory feature is enabled and static shared memory regions are present. This would result in an incorrect device tree generation and hwdom would not be able to detect the static shared memory region. Avoid this issue by checking the presence of the /reserved-memory node and appending the nodes instead of generating a duplicate /reserved-memory. Make make_shm_memory_node externally visible and rename it to make_shm_resv_memory_node to make clear it produces childs for /reserved-memory. Signed-off-by: Penny Zheng Signed-off-by: Luca Fancellu Reviewed-by: Michal Orzel --- v2: - fix comment, remove function signature change, fixed commit msg - rename make_shm_memory_node to make_shm_resv_memory_node in order to make clear that it produces childs for /reserved-memory - Add Michal R-by v1: - Rework of https://patchwork.kernel.org/project/xen-devel/patch/20231206090623.1932275-11-Penny.Zheng@arm.com/ --- xen/arch/arm/domain_build.c | 23 ++++++++++++++++++++--- xen/arch/arm/include/asm/static-shmem.h | 9 +++++++++ xen/arch/arm/static-shmem.c | 8 ++++---- 3 files changed, 33 insertions(+), 7 deletions(-) diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c index 0cc39b0bd7bb..68532ddc084c 100644 --- a/xen/arch/arm/domain_build.c +++ b/xen/arch/arm/domain_build.c @@ -1640,6 +1640,7 @@ static int __init handle_node(struct domain *d, struct kernel_info *kinfo, DT_MATCH_PATH("/hypervisor"), { /* sentinel */ }, }; + static __initdata bool res_mem_node_found = false; struct dt_device_node *child; int res, i, nirq, irq_id; const char *name; @@ -1734,6 +1735,19 @@ static int __init handle_node(struct domain *d, struct kernel_info *kinfo, if ( res ) return res; + if ( dt_node_path_is_equal(node, "/reserved-memory") ) + { + res_mem_node_found = true; + /* + * Avoid duplicate /reserved-memory nodes in Device Tree, so add the + * static shared memory nodes there. + */ + res = make_shm_resv_memory_node(kinfo, dt_n_addr_cells(node), + dt_n_size_cells(node)); + if ( res ) + return res; + } + for ( child = node->child; child != NULL; child = child->sibling ) { res = handle_node(d, kinfo, child, p2mt); @@ -1786,9 +1800,12 @@ static int __init handle_node(struct domain *d, struct kernel_info *kinfo, return res; } - res = make_resv_memory_node(kinfo, addrcells, sizecells); - if ( res ) - return res; + if ( !res_mem_node_found ) + { + res = make_resv_memory_node(kinfo, addrcells, sizecells); + if ( res ) + return res; + } } res = fdt_end_node(kinfo->fdt); diff --git a/xen/arch/arm/include/asm/static-shmem.h b/xen/arch/arm/include/asm/static-shmem.h index 2e8b138eb989..7495a91e7a31 100644 --- a/xen/arch/arm/include/asm/static-shmem.h +++ b/xen/arch/arm/include/asm/static-shmem.h @@ -34,6 +34,9 @@ int remove_shm_from_rangeset(const struct kernel_info *kinfo, int remove_shm_holes_for_domU(const struct kernel_info *kinfo, struct membanks *ext_regions); +int make_shm_resv_memory_node(const struct kernel_info *kinfo, int addrcells, + int sizecells); + #else /* !CONFIG_STATIC_SHM */ static inline int make_resv_memory_node(const struct kernel_info *kinfo, @@ -77,6 +80,12 @@ static inline int remove_shm_holes_for_domU(const struct kernel_info *kinfo, return 0; } +static inline int make_shm_resv_memory_node(const struct kernel_info *kinfo, + int addrcells, int sizecells) +{ + return 0; +} + #endif /* CONFIG_STATIC_SHM */ #endif /* __ASM_STATIC_SHMEM_H_ */ diff --git a/xen/arch/arm/static-shmem.c b/xen/arch/arm/static-shmem.c index 12e2df939915..c85f60dd1bf7 100644 --- a/xen/arch/arm/static-shmem.c +++ b/xen/arch/arm/static-shmem.c @@ -297,8 +297,8 @@ int __init process_shm(struct domain *d, struct kernel_info *kinfo, return 0; } -static int __init make_shm_memory_node(const struct kernel_info *kinfo, - int addrcells, int sizecells) +int __init make_shm_resv_memory_node(const struct kernel_info *kinfo, + int addrcells, int sizecells) { const struct membanks *mem = &kinfo->shm_mem.common; void *fdt = kinfo->fdt; @@ -306,7 +306,7 @@ static int __init make_shm_memory_node(const struct kernel_info *kinfo, int res = 0; if ( mem->nr_banks == 0 ) - return -ENOENT; + return 0; /* * For each shared memory region, a range is exposed under @@ -544,7 +544,7 @@ int __init make_resv_memory_node(const struct kernel_info *kinfo, int addrcells, if ( res ) return res; - res = make_shm_memory_node(kinfo, addrcells, sizecells); + res = make_shm_resv_memory_node(kinfo, addrcells, sizecells); if ( res ) return res;