From nobody Fri Nov 29 14:41:28 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass(p=none dis=none) header.from=kernel.org ARC-Seal: i=1; a=rsa-sha256; t=1636153435; cv=none; d=zohomail.com; s=zohoarc; b=FV9Svp83eIjmB1AzKjesMiI8H0bQzMETdIuN22zzRK9gTsZf+GS50JNYbjYZycAzq5J2dQcZ68ZFNfjTWoJWZkP4l1RJLPz7y5f0JPb8+6PMlX1qZi7dMO9JqYn5slcgMTUvoEcSoFA7REkXDPtm2RaF57kX9G6dszTbSHRRyj4= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1636153435; h=Content-Type:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=kwyQhRjK6ELk7DO3e/uRkoHG45ZPPwYSWoggOED6Bss=; b=RrSMwfRsS2FW3FB/Ka8Hnzx2yxMpcRWR/g7ibiyTHSux1nbFnO81lhlI5eYxwSHYkNrXzmijR0DT6hfGTS+FAE7nLX5JUDlW/VmXkdAYxdum/e+Jsa92TBFm4ZG21BcKhSbNNeHvyl3jfVXaR2myiIouw8KgZwMujaG5mVyFsVE= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1636153435653866.3399698035405; Fri, 5 Nov 2021 16:03:55 -0700 (PDT) Received: from list by lists.xenproject.org with outflank-mailman.222675.384991 (Exim 4.92) (envelope-from ) id 1mj8Ev-0004MC-3w; Fri, 05 Nov 2021 23:03:17 +0000 Received: by outflank-mailman (output) from mailman id 222675.384991; Fri, 05 Nov 2021 23:03:17 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1mj8Ev-0004M5-0z; Fri, 05 Nov 2021 23:03:17 +0000 Received: by outflank-mailman (input) for mailman id 222675; Fri, 05 Nov 2021 23:03:15 +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 1mj8Et-0004Lz-SX for xen-devel@lists.xenproject.org; Fri, 05 Nov 2021 23:03:15 +0000 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id 8d6ae631-3e8c-11ec-a9d2-d9f7a1cc8784; Sat, 06 Nov 2021 00:03:14 +0100 (CET) Received: by mail.kernel.org (Postfix) with ESMTPSA id 5EE6961159; Fri, 5 Nov 2021 23:03:12 +0000 (UTC) X-Outflank-Mailman: Message body and most headers restored to incoming version 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: 8d6ae631-3e8c-11ec-a9d2-d9f7a1cc8784 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1636153392; bh=ZioTLqifP4tPK+oG+UaCqA3huIsBqj9rTnTJB+WNAzw=; h=Date:From:To:cc:Subject:In-Reply-To:References:From; b=X03523abx9R3xnTkVj2nYxoVAVO5igBHFfGideMW/eqkrfugII3G+lEPFqi09Qqfe m0nFAxI2bDRShmHG8+r7aAAZbr31y7tPxipDJGxTya+2jV9vQLlhJgBCtjBN0Of/jG 0+knts4f3shsgeK0wcXhRcT+ZsT/C9gABjsA4MGE5U1KS4S96QGoxdLOJqfzfCQ+lu z3SzkQv/Pync//HX+XO6wngU9s2yw2N/CXHHCYjcIcJFTqVRN25nGaDSXYyzSZy4G3 vzfBfTjahG8HOL6K+pgG/JILBM4G+pYnwEneSPZuWJv+7ksADqFyLqRLOkV7LJMI+4 I2hfsp+EzQujw== Date: Fri, 5 Nov 2021 16:03:11 -0700 (PDT) From: Stefano Stabellini X-X-Sender: sstabellini@ubuntu-linux-20-04-desktop To: Stefano Stabellini cc: Penny Zheng , "xen-devel@lists.xenproject.org" , Wei Chen , Bertrand.Marquis@arm.com Subject: RE: static-mem preventing dom0 from booting In-Reply-To: Message-ID: References: User-Agent: Alpine 2.22 (DEB 394 2020-01-19) MIME-Version: 1.0 X-ZohoMail-DKIM: pass (identity @kernel.org) X-ZM-MESSAGEID: 1636153436451100001 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" On Fri, 5 Nov 2021, Stefano Stabellini wrote: > The scenario is extremely simple; you can see the full device tree > configuration in the attachment to my previous email. >=20 > - dom0 > - dom0less domU with static-mem >=20 > That's it! So basically it is just a normal dom0 + dom0less domU > configuration, which already works fine, where I added static-mem to the > domU and suddenly dom0 (not the domU!) stopped working. I did some more debugging today and I found the problem. The issue is that static-mem regions are added to the list of reserved_mem. However, reserved_mem is automatically assigned to Dom0 by default at the bottom of xen/arch/arm/domain_build.c:handle_node, see the second call to make_memory_node. Really, we shouldn't give to dom0 static-mem ranges meant for other domUs. E.g. the following change is sufficient to solve the problem: diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c index 88a79247cb..dc609c4f0e 100644 --- a/xen/arch/arm/domain_build.c +++ b/xen/arch/arm/domain_build.c @@ -891,6 +891,9 @@ static int __init make_memory_node(const struct domain = *d, u64 start =3D mem->bank[i].start; u64 size =3D mem->bank[i].size; =20 + if ( mem->bank[i].xen_domain ) + continue; + dt_dprintk(" Bank %d: %#"PRIx64"->%#"PRIx64"\n", i, start, start + size); =20 However, maybe a better fix would be to purge reserved_mem of any xen_domain items before calling make_memory_node. I found one additional issue regarding is_domain_direct_mapped which doesn't return true for static-mem domains. I think we need to add a direct_map bool to arch_domain and set it for both dom0 and static-mem dom0less domUs, so that we can change the implementation of is_domain_direct_mapped to: #define is_domain_direct_mapped(d) (d->arch.direct_map)