From nobody Tue Feb 10 15:28:31 2026 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 ARC-Seal: i=1; a=rsa-sha256; t=1645440679; cv=none; d=zohomail.com; s=zohoarc; b=WMHOReJ+x3CUEKVsvRu7ovf6lHn4o7ycXZC63VXBu77W7myYMxJNXtyeCXgrJxvKcz6T7bFrvoJgD/fvvy5dF5MJB3mzvpQ6BNDsJxmG6i1awrYykHC/vQlWSZjQVVsoFwMwLwwsq77b4zsXL6lDNFkUJaCb/MMkiSplAsjudYA= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1645440679; h=Content-Transfer-Encoding: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=f03/3Vf/UCt5JQLkCjdrbloKJVprsUR48KaiuBmSgTo=; b=DEYUDTnJNd/Htd0Cglh3h5xRQ9SBmU39MT5yW2ZqcAQdHGVkv3TcDsZMsy9WAfHPky8aTI4Zqph4Ycj/RQbOAX6aFd0oMHLzbxD0TytEIwvkPwqGZtFy8aI6kbxQLKCZ0HrAG74ICXtLvtL5gqT+EVb1T/Q3f9LHlpRPcb5zU4g= 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 Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1645440679929270.2682145934383; Mon, 21 Feb 2022 02:51:19 -0800 (PST) Received: from list by lists.xenproject.org with outflank-mailman.276091.472149 (Exim 4.92) (envelope-from ) id 1nM6HS-0006Su-Rv; Mon, 21 Feb 2022 10:50:58 +0000 Received: by outflank-mailman (output) from mailman id 276091.472149; Mon, 21 Feb 2022 10:50:58 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nM6HS-0006RM-Jb; Mon, 21 Feb 2022 10:50:58 +0000 Received: by outflank-mailman (input) for mailman id 276091; Mon, 21 Feb 2022 10:50:57 +0000 Received: from mail.xenproject.org ([104.130.215.37]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nM6HR-0006Po-Hh for xen-devel@lists.xenproject.org; Mon, 21 Feb 2022 10:50:57 +0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nM6HR-0002lU-8Y; Mon, 21 Feb 2022 10:50:57 +0000 Received: from 54-240-197-232.amazon.com ([54.240.197.232] helo=dev-dsk-jgrall-1b-035652ec.eu-west-1.amazon.com) by xenbits.xenproject.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.92) (envelope-from ) id 1nM5py-00070b-R6; Mon, 21 Feb 2022 10:22:35 +0000 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" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=xen.org; s=20200302mail; h=Content-Transfer-Encoding:MIME-Version:References: In-Reply-To:Message-Id:Date:Subject:Cc:To:From; bh=f03/3Vf/UCt5JQLkCjdrbloKJVprsUR48KaiuBmSgTo=; b=hiMhKzUPL64NsMAqmJd0Lk1PkD DJSjYDBI5vU5yLcg4P1nWPCTuyPHBADK9kZ/irp1z9TFfuVQgpyvmiU9PsIxJkOpo9UcAkQPeWN90 rr7vUIZAReVu/w4TKR92qz3FYyhvV8vcFgR1Q+m6BeyNaEEiM8b53E2fx65jka4DY1dQ=; From: Julien Grall To: xen-devel@lists.xenproject.org Cc: julien@xen.org, Julien Grall , Stefano Stabellini , Bertrand Marquis , Volodymyr Babchuk , Julien Grall Subject: [PATCH v3 12/19] xen/arm: mm: Allow page-table allocation from the boot allocator Date: Mon, 21 Feb 2022 10:22:11 +0000 Message-Id: <20220221102218.33785-13-julien@xen.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220221102218.33785-1-julien@xen.org> References: <20220221102218.33785-1-julien@xen.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @xen.org) X-ZM-MESSAGEID: 1645440680802100006 Content-Type: text/plain; charset="utf-8" From: Julien Grall At the moment, page-table can only be allocated from domheap. This means it is not possible to create mapping in the page-tables via map_pages_to_xen() if page-table needs to be allocated. In order to avoid open-coding page-tables update in early boot, we need to be able to allocate page-tables much earlier. Thankfully, we have the boot allocator for those cases. create_xen_table() is updated to cater early boot allocation by using alloc_boot_pages(). Note, this is not sufficient to bootstrap the page-tables (i.e mapping before any memory is actually mapped). This will be addressed separately. Signed-off-by: Julien Grall Signed-off-by: Julien Grall Reviewed-by: Stefano Stabellini --- Changes in v2: - New patch --- xen/arch/arm/mm.c | 20 ++++++++++++++------ 1 file changed, 14 insertions(+), 6 deletions(-) diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c index 58364bb6c820..f70b8cc7ce87 100644 --- a/xen/arch/arm/mm.c +++ b/xen/arch/arm/mm.c @@ -1014,19 +1014,27 @@ static void xen_unmap_table(const lpae_t *table) =20 static int create_xen_table(lpae_t *entry) { - struct page_info *pg; + mfn_t mfn; void *p; lpae_t pte; =20 - pg =3D alloc_domheap_page(NULL, 0); - if ( pg =3D=3D NULL ) - return -ENOMEM; + if ( system_state !=3D SYS_STATE_early_boot ) + { + struct page_info *pg =3D alloc_domheap_page(NULL, 0); + + if ( pg =3D=3D NULL ) + return -ENOMEM; + + mfn =3D page_to_mfn(pg); + } + else + mfn =3D alloc_boot_pages(1, 1); =20 - p =3D xen_map_table(page_to_mfn(pg)); + p =3D xen_map_table(mfn); clear_page(p); xen_unmap_table(p); =20 - pte =3D mfn_to_xen_entry(page_to_mfn(pg), MT_NORMAL); + pte =3D mfn_to_xen_entry(mfn, MT_NORMAL); pte.pt.table =3D 1; write_pte(entry, pte); =20 --=20 2.32.0