From nobody Sat Feb 7 15:29:54 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=virtuozzo.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1531929311024244.76611157598984; Wed, 18 Jul 2018 08:55:11 -0700 (PDT) Received: from localhost ([::1]:37319 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ffonF-0005nI-Vt for importer@patchew.org; Wed, 18 Jul 2018 11:55:10 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:52962) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ffoal-0003Hh-FU for qemu-devel@nongnu.org; Wed, 18 Jul 2018 11:42:18 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ffoag-0000IB-LD for qemu-devel@nongnu.org; Wed, 18 Jul 2018 11:42:15 -0400 Received: from relay.sw.ru ([185.231.240.75]:36386) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1ffoag-0000FN-8h for qemu-devel@nongnu.org; Wed, 18 Jul 2018 11:42:10 -0400 Received: from vz-out.virtuozzo.com ([185.231.240.5] helo=dptest2.qa.sw.ru) by relay.sw.ru with esmtp (Exim 4.90_1) (envelope-from ) id 1ffoae-0006bu-1f; Wed, 18 Jul 2018 18:42:08 +0300 From: Denis Plotnikov To: dgilbert@redhat.com, quintela@redhat.com, pbonzini@redhat.com Date: Wed, 18 Jul 2018 18:41:51 +0300 Message-Id: <20180718154200.26777-9-dplotnikov@virtuozzo.com> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180718154200.26777-1-dplotnikov@virtuozzo.com> References: <20180718154200.26777-1-dplotnikov@virtuozzo.com> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 185.231.240.75 Subject: [Qemu-devel] [PATCH v1 08/17] migration: add helpers to change VM memory protection rights X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Signed-off-by: Denis Plotnikov --- migration/ram.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++ migration/ram.h | 3 +++ 2 files changed, 57 insertions(+) diff --git a/migration/ram.c b/migration/ram.c index 27d3403435..ce3dead932 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -1555,6 +1555,60 @@ void ram_block_list_destroy(void) } } =20 +static int mem_protect(void *addr, uint64_t length, int prot) +{ + int ret =3D mprotect(addr, length, prot); + + if (ret < 0) { + error_report("%s: Can't change protection on ram block at %p", + __func__, addr); + } + + return ret; +} + +static int ram_set_ro(void *addr, uint64_t length) +{ + return mem_protect(addr, length, PROT_READ); +} + +static int ram_set_rw(void *addr, uint64_t length) +{ + return mem_protect(addr, length, PROT_READ | PROT_WRITE); +} + +int ram_block_list_set_readonly(void) +{ + RAMBlock *block =3D NULL; + RamBlockList *block_list =3D ram_bgs_block_list_get(); + int ret =3D 0; + + QLIST_FOREACH(block, block_list, bgs_next) { + ret =3D ram_set_ro(block->host, block->used_length); + if (ret) { + break; + } + } + + return ret; +} + +int ram_block_list_set_writable(void) +{ + RAMBlock *block =3D NULL; + RamBlockList *block_list =3D ram_bgs_block_list_get(); + int ret =3D 0; + + QLIST_FOREACH(block, block_list, bgs_next) { + ret =3D ram_set_rw(block->host, block->used_length); + if (ret) { + break; + } + } + + return ret; +} + static void ram_page_buffer_decrease_used(void) { qemu_event_reset(&ram_state->page_buffer.used_decreased); diff --git a/migration/ram.h b/migration/ram.h index 7c802c1d7f..4c463597a5 100644 --- a/migration/ram.h +++ b/migration/ram.h @@ -71,4 +71,7 @@ RAMBlock *ram_bgs_block_find(uint8_t *address, ram_addr_t= *page_offset); void *ram_page_buffer_get(void); int ram_page_buffer_free(void *buffer); =20 +int ram_block_list_set_readonly(void); +int ram_block_list_set_writable(void); + #endif --=20 2.17.0