From nobody Tue Feb 10 20:06:44 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=1619382754; cv=none; d=zohomail.com; s=zohoarc; b=WON2PO/NKSRIC1I/0OySrdI4FiHllBhp5t/3KytY8kcxIpMEgRrKaZffFDPzATE47TXh925YG6Jvn2CGlX0Ru915BCKqTR44vAXTGJoHimUcTQA9lP9SjlryixM8dxEYW1JgLF4spZPbfxOjBiZX3OKc2kOJ50imYT/KgVotf5w= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1619382754; h=Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:Message-ID:References:Sender:Subject:To; bh=kyXJNvfLj/1Qpk3hX2ctxX4bb1KB1kLqdFkNoEVhegI=; b=cH6KVRiuRhCxYyv4x5NF6HnR5+aCToRywGjbRVaiVWoCLwaUo+1RmNR1EpRUUsNEn7tWEtesIRdQ1LdSAAdYI4PZKdk139Zp9pESY6a0hrw4jFGEN4xlzGgDZ5MMaIulYBVLmcEgBUNfKhAXCCZ5ZU5CH/0Em2QNjoIok7eIbOk= 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 1619382754397736.3195089426832; Sun, 25 Apr 2021 13:32:34 -0700 (PDT) Received: from list by lists.xenproject.org with outflank-mailman.117359.223243 (Exim 4.92) (envelope-from ) id 1lalQO-0004So-BC; Sun, 25 Apr 2021 20:32:16 +0000 Received: by outflank-mailman (output) from mailman id 117359.223243; Sun, 25 Apr 2021 20:32:16 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1lalQO-0004ST-4L; Sun, 25 Apr 2021 20:32:16 +0000 Received: by outflank-mailman (input) for mailman id 117359; Sun, 25 Apr 2021 20:32:13 +0000 Received: from mail.xenproject.org ([104.130.215.37]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1lalQL-0004RD-NI for xen-devel@lists.xenproject.org; Sun, 25 Apr 2021 20:32:13 +0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1lalQL-00019v-8G; Sun, 25 Apr 2021 20:32:13 +0000 Received: from 54-240-197-235.amazon.com ([54.240.197.235] helo=ufe34d9ed68d054.ant.amazon.com) by xenbits.xenproject.org with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lal8N-0005m7-4G; Sun, 25 Apr 2021 20:13:39 +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=References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From; bh=kyXJNvfLj/1Qpk3hX2ctxX4bb1KB1kLqdFkNoEVhegI=; b=DMPjMKHaz0psSHPwnrQmyg1DL 5KZAnETEyRoMzMfgNqCyiOVcqcKu1W0hkOR3+LKUZ+oLcbcewEYQEtAqwwO50IMuRjtPur0d88H8y NL+elfsaML0BFMmROqtyeTC1Lp8vamrPgfUlhv+xqULeHNNcCEWErnA/oq7g15AaS6YZM=; From: Julien Grall To: xen-devel@lists.xenproject.org Cc: Wei.Chen@arm.com, Henry.Wang@arm.com, Penny.Zheng@arm.com, Bertrand.Marquis@arm.com, Julien Grall , Stefano Stabellini , Julien Grall , Volodymyr Babchuk , Julien Grall Subject: [PATCH RFCv2 11/15] xen/arm: mm: Allow page-table allocation from the boot allocator Date: Sun, 25 Apr 2021 21:13:14 +0100 Message-Id: <20210425201318.15447-12-julien@xen.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210425201318.15447-1-julien@xen.org> References: <20210425201318.15447-1-julien@xen.org> X-ZohoMail-DKIM: pass (identity @xen.org) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 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 ae5a07ea956b..d090fdfd5994 100644 --- a/xen/arch/arm/mm.c +++ b/xen/arch/arm/mm.c @@ -1011,19 +1011,27 @@ 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 2.17.1