From nobody Wed Nov 27 12:38:48 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1699281893936675.5546314349666; Mon, 6 Nov 2023 06:44:53 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1r00jK-0004id-Id; Mon, 06 Nov 2023 09:37:30 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1r00jC-0003tu-3o for qemu-devel@nongnu.org; Mon, 06 Nov 2023 09:37:22 -0500 Received: from mail.ozlabs.org ([2404:9400:2221:ea00::3] helo=gandalf.ozlabs.org) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1r00j9-0000sE-2P for qemu-devel@nongnu.org; Mon, 06 Nov 2023 09:37:21 -0500 Received: from gandalf.ozlabs.org (gandalf.ozlabs.org [150.107.74.76]) by gandalf.ozlabs.org (Postfix) with ESMTP id 4SPDT858x8z4xk5; Tue, 7 Nov 2023 01:37:16 +1100 (AEDT) Received: from authenticated.ozlabs.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mail.ozlabs.org (Postfix) with ESMTPSA id 4SPDT63jyWz4xk8; Tue, 7 Nov 2023 01:37:14 +1100 (AEDT) From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= To: qemu-devel@nongnu.org Cc: Alex Williamson , Eric Auger , Jean-Philippe Brucker , Yanghang Liu , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= Subject: [PULL 06/22] util/reserved-region: Add new ReservedRegion helpers Date: Mon, 6 Nov 2023 15:36:37 +0100 Message-ID: <20231106143653.302391-7-clg@redhat.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231106143653.302391-1-clg@redhat.com> References: <20231106143653.302391-1-clg@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2404:9400:2221:ea00::3; envelope-from=SRS0=Ju2X=GT=redhat.com=clg@ozlabs.org; helo=gandalf.ozlabs.org X-Spam_score_int: -39 X-Spam_score: -4.0 X-Spam_bar: ---- X-Spam_report: (-4.0 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZM-MESSAGEID: 1699281895123100003 From: Eric Auger Introduce resv_region_list_insert() helper which inserts a new ReservedRegion into a sorted list of reserved region. In case of overlap, the new region has higher priority and hides the existing overlapped segments. If the overlap is partial, new regions are created for parts which are not overlapped. The new region has higher priority independently on the type of the regions. Signed-off-by: Eric Auger Reviewed-by: Jean-Philippe Brucker Tested-by: Yanghang Liu Signed-off-by: C=C3=A9dric Le Goater --- include/qemu/reserved-region.h | 32 ++++++++++++ util/reserved-region.c | 91 ++++++++++++++++++++++++++++++++++ util/meson.build | 1 + 3 files changed, 124 insertions(+) create mode 100644 include/qemu/reserved-region.h create mode 100644 util/reserved-region.c diff --git a/include/qemu/reserved-region.h b/include/qemu/reserved-region.h new file mode 100644 index 0000000000000000000000000000000000000000..8e6f0a97e22bdda67645f807e6b= 5e9cf04093dce --- /dev/null +++ b/include/qemu/reserved-region.h @@ -0,0 +1,32 @@ +/* + * QEMU ReservedRegion helpers + * + * Copyright (c) 2023 Red Hat, Inc. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see . + */ + +#ifndef QEMU_RESERVED_REGION_H +#define QEMU_RESERVED_REGION_H + +#include "exec/memory.h" + +/* + * Insert a new region into a sorted list of reserved regions. In case + * there is overlap with existing regions, the new added region has + * higher priority and replaces the overlapped segment. + */ +GList *resv_region_list_insert(GList *list, ReservedRegion *reg); + +#endif diff --git a/util/reserved-region.c b/util/reserved-region.c new file mode 100644 index 0000000000000000000000000000000000000000..18f83eb4c654fbab5a040a539f9= 40bd605431909 --- /dev/null +++ b/util/reserved-region.c @@ -0,0 +1,91 @@ +/* + * QEMU ReservedRegion helpers + * + * Copyright (c) 2023 Red Hat, Inc. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see . + */ + +#include "qemu/osdep.h" +#include "qemu/range.h" +#include "qemu/reserved-region.h" + +GList *resv_region_list_insert(GList *list, ReservedRegion *reg) +{ + ReservedRegion *resv_iter, *new_reg; + Range *r =3D ®->range; + Range *range_iter; + GList *l; + + for (l =3D list; l ; ) { + resv_iter =3D (ReservedRegion *)l->data; + range_iter =3D &resv_iter->range; + + /* Skip all list elements strictly less than range to add */ + if (range_compare(range_iter, r) < 0) { + l =3D l->next; + } else if (range_compare(range_iter, r) > 0) { + return g_list_insert_before(list, l, reg); + } else { /* there is an overlap */ + if (range_contains_range(r, range_iter)) { + /* new range contains current item, simply remove this lat= ter */ + GList *prev =3D l->prev; + g_free(l->data); + list =3D g_list_delete_link(list, l); + if (prev) { + l =3D prev->next; + } else { + l =3D list; + } + } else if (range_contains_range(range_iter, r)) { + /* new region is included in the current region */ + if (range_lob(range_iter) =3D=3D range_lob(r)) { + /* adjacent on the left side, derives into 2 regions */ + range_set_bounds(range_iter, range_upb(r) + 1, + range_upb(range_iter)); + return g_list_insert_before(list, l, reg); + } else if (range_upb(range_iter) =3D=3D range_upb(r)) { + /* adjacent on the right side, derives into 2 regions = */ + range_set_bounds(range_iter, range_lob(range_iter), + range_lob(r) - 1); + l =3D l->next; + } else { + uint64_t lob =3D range_lob(range_iter); + /* + * the new range is in the middle of an existing one, + * split this latter into 3 regs instead + */ + range_set_bounds(range_iter, range_upb(r) + 1, + range_upb(range_iter)); + new_reg =3D g_new0(ReservedRegion, 1); + new_reg->type =3D resv_iter->type; + range_set_bounds(&new_reg->range, + lob, range_lob(r) - 1); + list =3D g_list_insert_before(list, l, new_reg); + return g_list_insert_before(list, l, reg); + } + } else if (range_lob(r) < range_lob(range_iter)) { + range_set_bounds(range_iter, range_upb(r) + 1, + range_upb(range_iter)); + return g_list_insert_before(list, l, reg); + } else { /* intersection on the upper range */ + range_set_bounds(range_iter, range_lob(range_iter), + range_lob(r) - 1); + l =3D l->next; + } + } /* overlap */ + } + return g_list_append(list, reg); +} + diff --git a/util/meson.build b/util/meson.build index 769b24f2e0df23a755a4ed460c5d67cfc49aa4c4..c3a24af5c5cf27059cea9511ebc= 0fe1804500b52 100644 --- a/util/meson.build +++ b/util/meson.build @@ -52,6 +52,7 @@ util_ss.add(files('qdist.c')) util_ss.add(files('qht.c')) util_ss.add(files('qsp.c')) util_ss.add(files('range.c')) +util_ss.add(files('reserved-region.c')) util_ss.add(files('stats64.c')) util_ss.add(files('systemd.c')) util_ss.add(files('transactions.c')) --=20 2.41.0