From nobody Fri Apr 19 23:00:41 2024 Delivered-To: importer@patchew.org Received-SPF: none (zoho.com: 192.237.175.120 is neither permitted nor denied by domain of lists.xenproject.org) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=fail; spf=none (zoho.com: 192.237.175.120 is neither permitted nor denied by domain of lists.xenproject.org) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=fail(p=none dis=none) header.from=kernel.org ARC-Seal: i=1; a=rsa-sha256; t=1559599446; cv=none; d=zoho.com; s=zohoarc; b=fc6BWzfEgM83c3gmywrID3NIIwIJ49djSYFObeD7wEiGvBaUy1G4Q6oMpxkNXkrFOzieUm66RFYx18hluwDvfjjpLX+OWsMxG6wbp3DK/AHw13OUCfAdeQ/Z6whVfSbLPU08X9GrCB4CHJQsIWGJXKsRbS/6oDQTf/hlGEgICH4= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1559599446; h=Content-Type: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:ARC-Authentication-Results; bh=lvqLSdZuKYOXTlRcxCVwuT367xbv/5/bqP9HqqYjtag=; b=jDtOfzATmGYT4VV5GOyIGG0adF2eUwgQ7BN3wxtkJKa1/MSDghgj0rQtFhOE4wm1WxBhvurCuSZqVT/3XX6TBDcBDijqgfX5zS7A/+709E0IVMfupsOYt0exvkvrb/C/EvDni4P9HoTNSSEg2506kvjWzLK5nsUbUvPZlKVpG1Q= ARC-Authentication-Results: i=1; mx.zoho.com; dkim=fail; spf=none (zoho.com: 192.237.175.120 is neither permitted nor denied by domain of lists.xenproject.org) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1559599446192231.66825765159956; Mon, 3 Jun 2019 15:04:06 -0700 (PDT) Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1hXv2W-0003Sj-VL; Mon, 03 Jun 2019 22:02:48 +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 1hXv2W-0003SX-Bf for xen-devel@lists.xenproject.org; Mon, 03 Jun 2019 22:02:48 +0000 Received: from mail.kernel.org (unknown [198.145.29.99]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 52269080-864b-11e9-8f4e-c72f00ae0891; Mon, 03 Jun 2019 22:02:47 +0000 (UTC) Received: from sstabellini-ThinkPad-T480s.xilinx.com (c-67-164-102-47.hsd1.ca.comcast.net [67.164.102.47]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 985982054F; Mon, 3 Jun 2019 22:02:46 +0000 (UTC) X-Inumbo-ID: 52269080-864b-11e9-8f4e-c72f00ae0891 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559599366; bh=nMfJrr9GCqfib1f87JPsGrJ4pJieLk2+NbBRp70klbk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=l0WYsnzoahDqKX1pumtiWrlycAEELOc+mx+/G6L4AY3e5E08rqcrkQ8bo/zFsCiKX pIQGwMChM8K6mNfWraXOjcpGLTBdvrtNQ0gKvGYh6jeEiN4uQSFhqCXhZ0Mt0xuLNY HdWKmJXbKyKBcF+rsFqCHJ47+uTsoG+fEDc7OPu0= From: Stefano Stabellini To: xen-devel@lists.xenproject.org Date: Mon, 3 Jun 2019 15:02:43 -0700 Message-Id: <20190603220245.22750-1-sstabellini@kernel.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: References: Subject: [Xen-devel] [PATCH v3 1/3] xen/arm: fix nr_pdxs calculation X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Stefano Stabellini , julien.grall@arm.com, sstabellini@kernel.org, JBeulich@suse.com MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) pfn_to_pdx expects an address, not a size, as a parameter. Specifically, it expects the end address, then the masks calculations compensate for any holes between start and end. Thus, we should pass the end address to pfn_to_pdx. The initial pdx is stored in frametable_base_pdx, so we can subtract the result of pfn_to_pdx(start_address) from nr_pdxs; we know that we don't need to cover any memory in the range 0-start in the frametable. Remove the variable `nr_pages' because it is unused. Signed-off-by: Stefano Stabellini CC: JBeulich@suse.com Reviewed-by: Julien Grall --- Changes in v3: - improve commit message Changes in v2: - use mfn_to_pdx and maddr_to_mfn along with mfn_add() --- xen/arch/arm/mm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c index 6ac169ce27..22ed91b5c9 100644 --- a/xen/arch/arm/mm.c +++ b/xen/arch/arm/mm.c @@ -886,8 +886,8 @@ void __init setup_xenheap_mappings(unsigned long base_m= fn, /* Map a frame table to cover physical addresses ps through pe */ void __init setup_frametable_mappings(paddr_t ps, paddr_t pe) { - unsigned long nr_pages =3D (pe - ps) >> PAGE_SHIFT; - unsigned long nr_pdxs =3D pfn_to_pdx(nr_pages); + unsigned long nr_pdxs =3D mfn_to_pdx(mfn_add(maddr_to_mfn(pe), -1)) - + mfn_to_pdx(maddr_to_mfn(ps)) + 1; unsigned long frametable_size =3D nr_pdxs * sizeof(struct page_info); mfn_t base_mfn; const unsigned long mapping_size =3D frametable_size < MB(32) ? MB(2) = : MB(32); --=20 2.17.1 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel From nobody Fri Apr 19 23:00:41 2024 Delivered-To: importer@patchew.org Received-SPF: none (zoho.com: 192.237.175.120 is neither permitted nor denied by domain of lists.xenproject.org) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=fail; spf=none (zoho.com: 192.237.175.120 is neither permitted nor denied by domain of lists.xenproject.org) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=fail(p=none dis=none) header.from=kernel.org ARC-Seal: i=1; a=rsa-sha256; t=1559599450; cv=none; d=zoho.com; s=zohoarc; b=c5WVNFYzi//x7hpFY9cZ7MCujNesqI956gsVe725RsPL/ysDH2h5501SkZA1lodqMp9kK2J2EF3kY8+l6pGLOMDpDe0FNs95vNiHfzcgbi3PSep4EfgOyfvIzz1Hv/uPvdCFdPHe/fGhx5HUdqexQApgKk/pf6oPv7iQT1H16h8= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1559599450; h=Content-Type: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:ARC-Authentication-Results; bh=q6F0rDrhKj2kRH5DV09GFES4C6HOKKX6syAYzKGLlf0=; b=QNnOxdR5MOk1pzA0jcVQbLRKtiC8kYKhdC28v3Woc5goty2OggupaZZGdFNp0jZ4JgoGXq1kwTdCTR0MYN/sBc/QILtpdLOIEySIy1ny7n8VhfAPE5AoOMsU+82mvSxdbntHJ0kBcpfOQRJtKaGJnTcX9lDXYncShclx5BiEnBQ= ARC-Authentication-Results: i=1; mx.zoho.com; dkim=fail; spf=none (zoho.com: 192.237.175.120 is neither permitted nor denied by domain of lists.xenproject.org) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1559599450710800.2541752935418; Mon, 3 Jun 2019 15:04:10 -0700 (PDT) Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1hXv2X-0003T1-9d; Mon, 03 Jun 2019 22:02:49 +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 1hXv2W-0003Se-Ka for xen-devel@lists.xenproject.org; Mon, 03 Jun 2019 22:02:48 +0000 Received: from mail.kernel.org (unknown [198.145.29.99]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 528f03cc-864b-11e9-b291-5f2b851eba2e; Mon, 03 Jun 2019 22:02:48 +0000 (UTC) Received: from sstabellini-ThinkPad-T480s.xilinx.com (c-67-164-102-47.hsd1.ca.comcast.net [67.164.102.47]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0D81923E77; Mon, 3 Jun 2019 22:02:47 +0000 (UTC) X-Inumbo-ID: 528f03cc-864b-11e9-b291-5f2b851eba2e DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559599367; bh=3CCUvl0LQ/WFZ3gY9nIlwyemZpPkp3hn2VdsDAJkuhI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hQZnlPB7u3xrrwHYCHjIg2oMgd6VeycOyuaItpE7H4MYIq8D92f/JYOYq9N5f33pO so4usxlrvoYXG6fN56jCknCGhF/ZxXRjKx1nsIGdvNeWU3G5ScBfMZJkiDi+vBPt4X wisH6HcKn6MvOKO/fAMIk3/6dzKAjoHrsL4/MzbI= From: Stefano Stabellini To: xen-devel@lists.xenproject.org Date: Mon, 3 Jun 2019 15:02:44 -0700 Message-Id: <20190603220245.22750-2-sstabellini@kernel.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: References: Subject: [Xen-devel] [PATCH v3 2/3] xen: actually skip the first MAX_ORDER bits in pfn_pdx_hole_setup X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Stefano Stabellini , sstabellini@kernel.org, wei.liu2@citrix.com, konrad.wilk@oracle.com, George.Dunlap@eu.citrix.com, andrew.cooper3@citrix.com, ian.jackson@eu.citrix.com, tim@xen.org, julien.grall@arm.com, JBeulich@suse.com MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) pfn_pdx_hole_setup is meant to skip the first MAX_ORDER bits, but actually it only skips the first MAX_ORDER-1 bits. The issue was probably introduced by bdb5439c3f ("x86_64: Ensure frame-table compression leaves MAX_ORDER aligned"), when changing to loop to start from MAX_ORDER-1 an adjustment by 1 was needed in the call to find_next_bit() but not done. Fix the issue by passing j+1 and i+1 to find_next_zero_bit and find_next_bit. Also add a check for i >=3D BITS_PER_LONG because find_{,next_}zero_bit() are free to assume that their last argument is less than their middle one. Signed-off-by: Stefano Stabellini Signed-off-by: Jan Beulich CC: andrew.cooper3@citrix.com CC: JBeulich@suse.com CC: George.Dunlap@eu.citrix.com CC: ian.jackson@eu.citrix.com CC: konrad.wilk@oracle.com CC: tim@xen.org CC: wei.liu2@citrix.com Acked-by: Julien Grall --- Changes in v2: - add commit title of bdb5439c3f - more CC - update commit message --- xen/common/pdx.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/xen/common/pdx.c b/xen/common/pdx.c index 50c21b6bf8..bb7e437049 100644 --- a/xen/common/pdx.c +++ b/xen/common/pdx.c @@ -83,8 +83,10 @@ void __init pfn_pdx_hole_setup(unsigned long mask) */ for ( j =3D MAX_ORDER-1; ; ) { - i =3D find_next_zero_bit(&mask, BITS_PER_LONG, j); - j =3D find_next_bit(&mask, BITS_PER_LONG, i); + i =3D find_next_zero_bit(&mask, BITS_PER_LONG, j + 1); + if ( i >=3D BITS_PER_LONG ) + break; + j =3D find_next_bit(&mask, BITS_PER_LONG, i + 1); if ( j >=3D BITS_PER_LONG ) break; if ( j - i > hole_shift ) --=20 2.17.1 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel From nobody Fri Apr 19 23:00:41 2024 Delivered-To: importer@patchew.org Received-SPF: none (zoho.com: 192.237.175.120 is neither permitted nor denied by domain of lists.xenproject.org) client-ip=192.237.175.120; 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Mon, 3 Jun 2019 22:02:47 +0000 (UTC) X-Inumbo-ID: 52f7aa8a-864b-11e9-a35d-3f1990661454 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559599368; bh=Sb+G7D0OfxVfHWapWMJscrohNrwgbQqmQouZL6hY+FI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NnkieFNWkpSHVjMwwOlSCq4EmyjmimLWNEiAb3RVt7glXGBhs7VoDx5AkD+z6bFoy yfDq9HO+UOYJtT5YuvXhgwJ4AQyMQq2qM9nmMUZ/PtTMO8baksr/1fQ1yJuBQekp18 uHe3OUCKljO8S6DRVbFUAy1p7lqA1HyvwIkT8uxY= From: Stefano Stabellini To: xen-devel@lists.xenproject.org Date: Mon, 3 Jun 2019 15:02:45 -0700 Message-Id: <20190603220245.22750-3-sstabellini@kernel.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: References: Subject: [Xen-devel] [PATCH v3 3/3] xen/arm: fix mask calculation in pdx_init_mask X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Stefano Stabellini , sstabellini@kernel.org, wei.liu2@citrix.com, konrad.wilk@oracle.com, George.Dunlap@eu.citrix.com, andrew.cooper3@citrix.com, ian.jackson@eu.citrix.com, tim@xen.org, julien.grall@arm.com, JBeulich@suse.com MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) The mask calculation in pdx_init_mask is wrong when the first bank starts at address 0x0. The reason is that pdx_init_mask will do '0 - 1' causing an underflow. As a result, the mask becomes 0xffffffffffffffff which is the biggest possible mask and ends up causing a significant memory waste in the frametable size computation. For instance, on platforms that have a low memory bank starting at 0x0 and a high memory bank, the frametable will end up covering all the holes in between. The purpose of the mask is to be passed as a parameter to pfn_pdx_hole_setup, which based on the mask parameter calculates pfn_pdx_hole_shift, pfn_pdx_bottom_mask, etc. which are actually the important masks for frametable initialization later on. pfn_pdx_hole_setup never compresses addresses below MAX_ORDER bits (1GB on ARM). Thus, it is safe to initialize mask passing 1ULL << (MAX_ORDER + PAGE_SHIFT) as start address to pdx_init_mask. Signed-off-by: Stefano Stabellini CC: JBeulich@suse.com CC: andrew.cooper3@citrix.com CC: George.Dunlap@eu.citrix.com CC: ian.jackson@eu.citrix.com CC: konrad.wilk@oracle.com CC: tim@xen.org CC: wei.liu2@citrix.com --- Changes in v3: - improve in-code comments Changes in v2: - update commit message - add in-code comments regarding update sites - improve in-code comments - move the mask initialization changes to pdx_init_mask --- xen/arch/arm/setup.c | 9 ++++++++- xen/common/pdx.c | 8 +++++++- 2 files changed, 15 insertions(+), 2 deletions(-) diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c index ccb0f181ea..45312df006 100644 --- a/xen/arch/arm/setup.c +++ b/xen/arch/arm/setup.c @@ -482,7 +482,14 @@ static void __init init_pdx(void) { paddr_t bank_start, bank_size, bank_end; =20 - u64 mask =3D pdx_init_mask(bootinfo.mem.bank[0].start); + /* + * Arm does not have any restrictions on the bits to compress. Pass 0 = to + * let the common code further restrict the mask. + * + * If the logic changes in pfn_pdx_hole_setup we might have to + * update this function too. + */ + u64 mask =3D pdx_init_mask(0x0); int bank; =20 for ( bank =3D 0 ; bank < bootinfo.mem.nr_banks; bank++ ) diff --git a/xen/common/pdx.c b/xen/common/pdx.c index bb7e437049..a3c6f4c1ee 100644 --- a/xen/common/pdx.c +++ b/xen/common/pdx.c @@ -50,9 +50,12 @@ static u64 __init fill_mask(u64 mask) return mask; } =20 +/* + * We don't compress the first MAX_ORDER bit of the addresses. + */ u64 __init pdx_init_mask(u64 base_addr) { - return fill_mask(base_addr - 1); + return fill_mask(max(base_addr, (u64)1 << (MAX_ORDER + PAGE_SHIFT)) - = 1); } =20 u64 __init pdx_region_mask(u64 base, u64 len) @@ -80,6 +83,9 @@ void __init pfn_pdx_hole_setup(unsigned long mask) * This guarantees that page-pointer arithmetic remains valid within * contiguous aligned ranges of 2^MAX_ORDER pages. Among others, our * buddy allocator relies on this assumption. + * + * If the logic changes here, we might have to update the ARM specific + * init_pdx too. */ for ( j =3D MAX_ORDER-1; ; ) { --=20 2.17.1 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel