From patchwork Mon Feb 21 10:22:10 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Julien Grall X-Patchwork-Id: 12753423 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 3C25FC4332F for ; Mon, 21 Feb 2022 10:51:12 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.276095.472182 (Exim 4.92) (envelope-from ) id 1nM6HV-00077Z-5j; Mon, 21 Feb 2022 10:51:01 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 276095.472182; Mon, 21 Feb 2022 10:51:01 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nM6HU-00073Q-OT; Mon, 21 Feb 2022 10:51:00 +0000 Received: by outflank-mailman (input) for mailman id 276095; Mon, 21 Feb 2022 10:50:58 +0000 Received: from mail.xenproject.org ([104.130.215.37]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nM6HS-0006QN-CA for xen-devel@lists.xenproject.org; Mon, 21 Feb 2022 10:50:58 +0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nM6HR-0002lY-C0; 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 1nM5px-00070b-P2; Mon, 21 Feb 2022 10:22:33 +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=hWjfevoUxZaDKcehRUZH+C4jM8zdEI8w51IWDQgtbOY=; b=RuUM164HznDXh6/dLShCUL7Lum EgpxRX1vKp5TmYi/aA/2lysuQY0Qdha+xIARUS7HqNl8nQjr9/2Nf1+AV/5IB7+NQMaTd0ueMU/Sj NV1g+ENGfjBa69WssNjj2ehEeY9/yty7yDBH+2WREYgwIIcfvU7MxEf4gKZMBEiLDmGo=; From: Julien Grall To: xen-devel@lists.xenproject.org Cc: julien@xen.org, Julien Grall , Stefano Stabellini , Bertrand Marquis , Volodymyr Babchuk Subject: [PATCH v3 11/19] xen/arm: mm: Allocate xen page tables in domheap rather than xenheap Date: Mon, 21 Feb 2022 10:22:10 +0000 Message-Id: <20220221102218.33785-12-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 xen_{un,}map_table() already uses the helper to map/unmap pages on-demand (note this is currently a NOP on arm64). So switching to domheap don't have any disavantage. But this as the benefit: - to keep the page tables unmapped if an arch decided to do so - reduce xenheap use on arm32 which can be pretty small Signed-off-by: Julien Grall Acked-by: Stefano Stabellini --- Changes in v3: - Add Stefano's acked-by Changes in v2: - New patch --- xen/arch/arm/mm.c | 36 +++++++++++++++++++++--------------- 1 file changed, 21 insertions(+), 15 deletions(-) diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c index 1e5c2c45dcf9..58364bb6c820 100644 --- a/xen/arch/arm/mm.c +++ b/xen/arch/arm/mm.c @@ -972,21 +972,6 @@ void *ioremap(paddr_t pa, size_t len) return ioremap_attr(pa, len, PAGE_HYPERVISOR_NOCACHE); } -static int create_xen_table(lpae_t *entry) -{ - void *p; - lpae_t pte; - - p = alloc_xenheap_page(); - if ( p == NULL ) - return -ENOMEM; - clear_page(p); - pte = mfn_to_xen_entry(virt_to_mfn(p), MT_NORMAL); - pte.pt.table = 1; - write_pte(entry, pte); - return 0; -} - static lpae_t *xen_map_table(mfn_t mfn) { /* @@ -1027,6 +1012,27 @@ static void xen_unmap_table(const lpae_t *table) unmap_domain_page(table); } +static int create_xen_table(lpae_t *entry) +{ + struct page_info *pg; + void *p; + lpae_t pte; + + pg = alloc_domheap_page(NULL, 0); + if ( pg == NULL ) + return -ENOMEM; + + p = xen_map_table(page_to_mfn(pg)); + clear_page(p); + xen_unmap_table(p); + + pte = mfn_to_xen_entry(page_to_mfn(pg), MT_NORMAL); + pte.pt.table = 1; + write_pte(entry, pte); + + return 0; +} + #define XEN_TABLE_MAP_FAILED 0 #define XEN_TABLE_SUPER_PAGE 1 #define XEN_TABLE_NORMAL_PAGE 2