From patchwork Fri Dec 6 15:53:29 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Xia, Hongyan" X-Patchwork-Id: 11276707 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 32DFE138D for ; Fri, 6 Dec 2019 15:54:43 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 0EA772173E for ; Fri, 6 Dec 2019 15:54:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b="mmG/3/Vh" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0EA772173E Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=amazon.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1idFvT-0007ee-5k; Fri, 06 Dec 2019 15:53:51 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1idFvR-0007eT-Lb for xen-devel@lists.xenproject.org; Fri, 06 Dec 2019 15:53:49 +0000 X-Inumbo-ID: 96fad505-1840-11ea-8369-12813bfff9fa Received: from smtp-fw-33001.amazon.com (unknown [207.171.190.10]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 96fad505-1840-11ea-8369-12813bfff9fa; Fri, 06 Dec 2019 15:53:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1575647630; x=1607183630; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version; bh=A5vcgeSMZyGeWdyqEv2fkd+sqFt4TRuuh1Jn3NxD7TM=; b=mmG/3/Vh5B8xDBLPvxO6gYMAkau1STREpMNcG1hQDsFLyU1TfD3E3E+e zpZb7jXYT13Xp9+Xm0V22xVhRhbVyZQ2czP2ykO/4VAsOAy8wmVlurUFy jQM+OJ2UI2ZkOjRgxVUcYBIdKP/ULNOdEXqbcOhzfT6wR8ttpTvZQhcJ3 8=; IronPort-SDR: 7ltzIbI8zFtpkWKl3yyrpa8HTHi7rUELEA7YJ259W6oG/Sr9OMWRZsZB9/tZBP2Cc5iXQElQJW GvfHh6EEVNyg== X-IronPort-AV: E=Sophos;i="5.69,285,1571702400"; d="scan'208";a="13419464" Received: from sea32-co-svc-lb4-vlan3.sea.corp.amazon.com (HELO email-inbound-relay-1a-16acd5e0.us-east-1.amazon.com) ([10.47.23.38]) by smtp-border-fw-out-33001.sea14.amazon.com with ESMTP; 06 Dec 2019 15:53:38 +0000 Received: from EX13MTAUEA001.ant.amazon.com (iad55-ws-svc-p15-lb9-vlan2.iad.amazon.com [10.40.159.162]) by email-inbound-relay-1a-16acd5e0.us-east-1.amazon.com (Postfix) with ESMTPS id 4C662A1DC2; Fri, 6 Dec 2019 15:53:35 +0000 (UTC) Received: from EX13D37EUA002.ant.amazon.com (10.43.165.200) by EX13MTAUEA001.ant.amazon.com (10.43.61.243) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Fri, 6 Dec 2019 15:53:34 +0000 Received: from EX13MTAUEE001.ant.amazon.com (10.43.62.200) by EX13D37EUA002.ant.amazon.com (10.43.165.200) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Fri, 6 Dec 2019 15:53:33 +0000 Received: from u60d575063b1f53.ant.amazon.com (10.125.106.64) by mail-relay.amazon.com (10.43.62.226) with Microsoft SMTP Server id 15.0.1367.3 via Frontend Transport; Fri, 6 Dec 2019 15:53:32 +0000 From: Hongyan Xia To: Date: Fri, 6 Dec 2019 15:53:29 +0000 Message-ID: <86a6fb68f76ab287f5c2d99d1e7954e8b2d1ab05.1575646580.git.hongyxia@amazon.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: References: MIME-Version: 1.0 Precedence: Bulk Subject: [Xen-devel] [PATCH 1/2] x86/mm: factor out the code for shattering an l3 PTE X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Andrew Cooper , jgrall@amazon.com, Wei Liu , Jan Beulich , =?utf-8?q?Roger_Pau_?= =?utf-8?q?Monn=C3=A9?= Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" map_pages_to_xen and modify_xen_mappings are performing almost exactly the same operations when shattering an l3 PTE, the only difference being whether we want to flush. Signed-off-by: Hongyan Xia --- xen/arch/x86/mm.c | 85 ++++++++++++++++++++++------------------------- 1 file changed, 40 insertions(+), 45 deletions(-) diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c index 7d4dd80a85..42aaaa1083 100644 --- a/xen/arch/x86/mm.c +++ b/xen/arch/x86/mm.c @@ -5151,6 +5151,43 @@ l1_pgentry_t *virt_to_xen_l1e(unsigned long v) flush_area_local((const void *)v, f) : \ flush_area_all((const void *)v, f)) +/* Shatter an l3 entry and populate l2. If virt is passed in, also do flush. */ +static void shatter_l3e(l3_pgentry_t *pl3e, l2_pgentry_t *l2t, + unsigned long virt, bool locking) +{ + unsigned int i; + l3_pgentry_t ol3e = *pl3e; + + for ( i = 0; i < L2_PAGETABLE_ENTRIES; i++ ) + l2e_write(l2t + i, + l2e_from_pfn(l3e_get_pfn(ol3e) + + (i << PAGETABLE_ORDER), + l3e_get_flags(ol3e))); + + if ( locking ) + spin_lock(&map_pgdir_lock); + if ( (l3e_get_flags(ol3e) & _PAGE_PRESENT) && + (l3e_get_flags(ol3e) & _PAGE_PSE) ) + { + l3e_write_atomic(pl3e, l3e_from_mfn(virt_to_mfn(l2t), + __PAGE_HYPERVISOR)); + l2t = NULL; + } + if ( locking ) + spin_unlock(&map_pgdir_lock); + if ( virt ) + { + unsigned int flush_flags = + FLUSH_TLB | FLUSH_ORDER(2 * PAGETABLE_ORDER); + + if ( (l3e_get_flags(ol3e) & _PAGE_GLOBAL) ) + flush_flags |= FLUSH_TLB_GLOBAL; + flush_area(virt, flush_flags); + } + if ( l2t ) + free_xen_pagetable(l2t); +} + int map_pages_to_xen( unsigned long virt, mfn_t mfn, @@ -5244,9 +5281,6 @@ int map_pages_to_xen( if ( (l3e_get_flags(ol3e) & _PAGE_PRESENT) && (l3e_get_flags(ol3e) & _PAGE_PSE) ) { - unsigned int flush_flags = - FLUSH_TLB | FLUSH_ORDER(2 * PAGETABLE_ORDER); - /* Skip this PTE if there is no change. */ if ( ((l3e_get_pfn(ol3e) & ~(L2_PAGETABLE_ENTRIES * L1_PAGETABLE_ENTRIES - 1)) + @@ -5270,30 +5304,8 @@ int map_pages_to_xen( pl2e = alloc_xen_pagetable(); if ( pl2e == NULL ) return -ENOMEM; - - for ( i = 0; i < L2_PAGETABLE_ENTRIES; i++ ) - l2e_write(pl2e + i, - l2e_from_pfn(l3e_get_pfn(ol3e) + - (i << PAGETABLE_ORDER), - l3e_get_flags(ol3e))); - - if ( l3e_get_flags(ol3e) & _PAGE_GLOBAL ) - flush_flags |= FLUSH_TLB_GLOBAL; - - if ( locking ) - spin_lock(&map_pgdir_lock); - if ( (l3e_get_flags(*pl3e) & _PAGE_PRESENT) && - (l3e_get_flags(*pl3e) & _PAGE_PSE) ) - { - l3e_write_atomic(pl3e, l3e_from_mfn(virt_to_mfn(pl2e), - __PAGE_HYPERVISOR)); - pl2e = NULL; - } - if ( locking ) - spin_unlock(&map_pgdir_lock); - flush_area(virt, flush_flags); - if ( pl2e ) - free_xen_pagetable(pl2e); + /* Pass virt to indicate we need to flush. */ + shatter_l3e(pl3e, pl2e, virt, locking); } pl2e = virt_to_xen_l2e(virt); @@ -5581,24 +5593,7 @@ int modify_xen_mappings(unsigned long s, unsigned long e, unsigned int nf) pl2e = alloc_xen_pagetable(); if ( !pl2e ) return -ENOMEM; - for ( i = 0; i < L2_PAGETABLE_ENTRIES; i++ ) - l2e_write(pl2e + i, - l2e_from_pfn(l3e_get_pfn(*pl3e) + - (i << PAGETABLE_ORDER), - l3e_get_flags(*pl3e))); - if ( locking ) - spin_lock(&map_pgdir_lock); - if ( (l3e_get_flags(*pl3e) & _PAGE_PRESENT) && - (l3e_get_flags(*pl3e) & _PAGE_PSE) ) - { - l3e_write_atomic(pl3e, l3e_from_mfn(virt_to_mfn(pl2e), - __PAGE_HYPERVISOR)); - pl2e = NULL; - } - if ( locking ) - spin_unlock(&map_pgdir_lock); - if ( pl2e ) - free_xen_pagetable(pl2e); + shatter_l3e(pl3e, pl2e, 0, locking); } /*