From patchwork Wed Dec 6 09:06:21 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Penny Zheng X-Patchwork-Id: 13481308 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 C38EAC4167B for ; Wed, 6 Dec 2023 09:18:58 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.649040.1013312 (Exim 4.92) (envelope-from ) id 1rAo2z-0002WP-2g; Wed, 06 Dec 2023 09:18:25 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 649040.1013312; Wed, 06 Dec 2023 09:18:25 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1rAo2z-0002WI-09; Wed, 06 Dec 2023 09:18:25 +0000 Received: by outflank-mailman (input) for mailman id 649040; Wed, 06 Dec 2023 09:18:23 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1rAns3-0002Yw-Rb for xen-devel@lists.xenproject.org; Wed, 06 Dec 2023 09:07:07 +0000 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by se1-gles-sth1.inumbo.com (Halon) with ESMTP id d45cd516-9416-11ee-98e5-6d05b1d4d9a1; Wed, 06 Dec 2023 10:07:07 +0100 (CET) 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 A3AD5139F; Wed, 6 Dec 2023 01:07:52 -0800 (PST) Received: from a011292.shanghai.arm.com (a011292.shanghai.arm.com [10.169.190.94]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id AB8983F7F4; Wed, 6 Dec 2023 01:07:03 -0800 (PST) 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: d45cd516-9416-11ee-98e5-6d05b1d4d9a1 From: Penny Zheng To: xen-devel@lists.xenproject.org, michal.orzel@amd.com Cc: wei.chen@arm.com, Penny Zheng , Stefano Stabellini , Julien Grall , Bertrand Marquis , Volodymyr Babchuk , Penny Zheng Subject: [PATCH v5 09/11] xen/docs: refine docs about static shared memory Date: Wed, 6 Dec 2023 17:06:21 +0800 Message-Id: <20231206090623.1932275-10-Penny.Zheng@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20231206090623.1932275-1-Penny.Zheng@arm.com> References: <20231206090623.1932275-1-Penny.Zheng@arm.com> MIME-Version: 1.0 This commit amends docs(docs/misc/arm/device-tree/booting.txt) to include the new scenario where host address is not provided in "xen,shared-mem" property, and we also add a new example to explain in detail. We also fix some buggy info in the docs, like SHMID is "my-shared-mem-1", not "0x1". Signed-off-by: Penny Zheng --- docs/misc/arm/device-tree/booting.txt | 52 ++++++++++++++++++++------- 1 file changed, 39 insertions(+), 13 deletions(-) diff --git a/docs/misc/arm/device-tree/booting.txt b/docs/misc/arm/device-tree/booting.txt index bbd955e9c2..ac4bad6fe5 100644 --- a/docs/misc/arm/device-tree/booting.txt +++ b/docs/misc/arm/device-tree/booting.txt @@ -590,7 +590,7 @@ communication. An array takes a physical address, which is the base address of the shared memory region in host physical address space, a size, and a guest physical address, as the target address of the mapping. - e.g. xen,shared-mem = < [host physical address] [guest address] [size] > + e.g. xen,shared-mem = < [host physical address] [guest address] [size] >; It shall also meet the following criteria: 1) If the SHM ID matches with an existing region, the address range of the @@ -601,8 +601,8 @@ communication. The number of cells for the host address (and size) is the same as the guest pseudo-physical address and they are inherited from the parent node. - Host physical address is optional, when missing Xen decides the location - (currently unimplemented). + Host physical address is optional, when missing Xen decides the location. + e.g. xen,shared-mem = < [guest address] [size] >; - role (Optional) @@ -629,7 +629,7 @@ chosen { role = "owner"; xen,shm-id = "my-shared-mem-0"; xen,shared-mem = <0x10000000 0x10000000 0x10000000>; - } + }; domU1 { compatible = "xen,domain"; @@ -640,25 +640,36 @@ chosen { vpl011; /* - * shared memory region identified as 0x0(xen,shm-id = <0x0>) - * is shared between Dom0 and DomU1. + * shared memory region "my-shared-mem-0" is shared + * between Dom0 and DomU1. */ domU1-shared-mem@10000000 { compatible = "xen,domain-shared-memory-v1"; role = "borrower"; xen,shm-id = "my-shared-mem-0"; xen,shared-mem = <0x10000000 0x50000000 0x10000000>; - } + }; /* - * shared memory region identified as 0x1(xen,shm-id = <0x1>) - * is shared between DomU1 and DomU2. + * shared memory region "my-shared-mem-1" is shared between + * DomU1 and DomU2. */ domU1-shared-mem@50000000 { compatible = "xen,domain-shared-memory-v1"; xen,shm-id = "my-shared-mem-1"; xen,shared-mem = <0x50000000 0x60000000 0x20000000>; - } + }; + + /* + * shared memory region "my-shared-mem-2" is shared between + * DomU1 and DomU2. + */ + domU1-shared-mem-2 { + compatible = "xen,domain-shared-memory-v1"; + xen,shm-id = "my-shared-mem-2"; + role = "owner"; + xen,shared-mem = <0x80000000 0x20000000>; + }; ...... @@ -672,14 +683,21 @@ chosen { cpus = <1>; /* - * shared memory region identified as 0x1(xen,shm-id = <0x1>) - * is shared between domU1 and domU2. + * shared memory region "my-shared-mem-1" is shared between + * domU1 and domU2. */ domU2-shared-mem@50000000 { compatible = "xen,domain-shared-memory-v1"; xen,shm-id = "my-shared-mem-1"; xen,shared-mem = <0x50000000 0x70000000 0x20000000>; - } + }; + + domU2-shared-mem-2 { + compatible = "xen,domain-shared-memory-v1"; + xen,shm-id = "my-shared-mem-2"; + role = "borrower"; + xen,shared-mem = <0x90000000 0x20000000>; + }; ...... }; @@ -699,3 +717,11 @@ shared between DomU1 and DomU2. It will get mapped at 0x60000000 in DomU1 guest physical address space, and at 0x70000000 in DomU2 guest physical address space. DomU1 and DomU2 are both the borrower domain, the owner domain is the default owner domain DOMID_IO. + +For the static shared memory region "my-shared-mem-2", since host physical +address is not provided by user, Xen will automatically allocate 512MB +from heap as static shared memory to be shared between DomU1 and DomU2. +The automatically allocated static shared memory will get mapped at +0x80000000 in DomU1 guest physical address space, and at 0x90000000 in DomU2 +guest physical address space. DomU1 is explicitly defined as the owner domain, +and DomU2 is the borrower domain.