From patchwork Mon Feb 21 10:22:11 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Julien Grall X-Patchwork-Id: 12753422 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 CE53DC433F5 for ; Mon, 21 Feb 2022 10:51:11 +0000 (UTC) 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 X-Outflank-Mailman: Message body and most headers restored to incoming version 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-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 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) static int create_xen_table(lpae_t *entry) { - struct page_info *pg; + mfn_t mfn; void *p; lpae_t pte; - pg = alloc_domheap_page(NULL, 0); - if ( pg == NULL ) - return -ENOMEM; + if ( system_state != SYS_STATE_early_boot ) + { + struct page_info *pg = alloc_domheap_page(NULL, 0); + + if ( pg == NULL ) + return -ENOMEM; + + mfn = page_to_mfn(pg); + } + else + mfn = alloc_boot_pages(1, 1); - p = xen_map_table(page_to_mfn(pg)); + p = xen_map_table(mfn); clear_page(p); xen_unmap_table(p); - pte = mfn_to_xen_entry(page_to_mfn(pg), MT_NORMAL); + pte = mfn_to_xen_entry(mfn, MT_NORMAL); pte.pt.table = 1; write_pte(entry, pte);