From patchwork Tue Jul 23 09:07:18 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefano Garzarella X-Patchwork-Id: 11054145 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id AC500138D for ; Tue, 23 Jul 2019 09:08:04 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9BCBA284AF for ; Tue, 23 Jul 2019 09:08:04 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8FD0028592; Tue, 23 Jul 2019 09:08:04 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 4034C284AF for ; Tue, 23 Jul 2019 09:08:04 +0000 (UTC) Received: from localhost ([::1]:40454 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hpqmB-0005Fg-6k for patchwork-qemu-devel@patchwork.kernel.org; Tue, 23 Jul 2019 05:08:03 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:41562) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hpqln-0003bR-2z for qemu-devel@nongnu.org; Tue, 23 Jul 2019 05:07:40 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hpqll-00026B-2I for qemu-devel@nongnu.org; Tue, 23 Jul 2019 05:07:38 -0400 Received: from mx1.redhat.com ([209.132.183.28]:52976) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hpqlj-00023S-37 for qemu-devel@nongnu.org; Tue, 23 Jul 2019 05:07:36 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 3913F30821A0; Tue, 23 Jul 2019 09:07:33 +0000 (UTC) Received: from steredhat.redhat.com (unknown [10.36.118.55]) by smtp.corp.redhat.com (Postfix) with ESMTP id E04B25D9DE; Tue, 23 Jul 2019 09:07:30 +0000 (UTC) From: Stefano Garzarella To: qemu-devel@nongnu.org Date: Tue, 23 Jul 2019 11:07:18 +0200 Message-Id: <20190723090718.14590-3-sgarzare@redhat.com> In-Reply-To: <20190723090718.14590-1-sgarzare@redhat.com> References: <20190723090718.14590-1-sgarzare@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.47]); Tue, 23 Jul 2019 09:07:33 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH 2/2] hw/i386/pc: Map into memory the initrd X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Eduardo Habkost , Sergio Lopez , "Michael S. Tsirkin" , Julio Montes , Paolo Bonzini , Richard Henderson Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP In order to reduce the memory footprint we map into memory the initrd using g_mapped_file_new() instead of reading it. In this way we can share the initrd pages between multiple instances of QEMU. Suggested-by: Paolo Bonzini Signed-off-by: Stefano Garzarella --- hw/i386/pc.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/hw/i386/pc.c b/hw/i386/pc.c index 549c437050..b139589777 100644 --- a/hw/i386/pc.c +++ b/hw/i386/pc.c @@ -1241,17 +1241,20 @@ static void load_linux(PCMachineState *pcms, /* load initrd */ if (initrd_filename) { + GMappedFile *gmf; gsize initrd_size; gchar *initrd_data; GError *gerr = NULL; - if (!g_file_get_contents(initrd_filename, &initrd_data, - &initrd_size, &gerr)) { + gmf = g_mapped_file_new(initrd_filename, false, &gerr); + if (!gmf) { fprintf(stderr, "qemu: error reading initrd %s: %s\n", initrd_filename, gerr->message); exit(1); } + initrd_data = g_mapped_file_get_contents(gmf); + initrd_size = g_mapped_file_get_length(gmf); initrd_max = pcms->below_4g_mem_size - pcmc->acpi_data_size - 1; if (initrd_size >= initrd_max) { fprintf(stderr, "qemu: initrd is too large, cannot support." @@ -1378,6 +1381,7 @@ static void load_linux(PCMachineState *pcms, /* load initrd */ if (initrd_filename) { + GMappedFile *gmf; gsize initrd_size; gchar *initrd_data; GError *gerr = NULL; @@ -1387,12 +1391,15 @@ static void load_linux(PCMachineState *pcms, exit(1); } - if (!g_file_get_contents(initrd_filename, &initrd_data, - &initrd_size, &gerr)) { + gmf = g_mapped_file_new(initrd_filename, false, &gerr); + if (!gmf) { fprintf(stderr, "qemu: error reading initrd %s: %s\n", initrd_filename, gerr->message); exit(1); } + + initrd_data = g_mapped_file_get_contents(gmf); + initrd_size = g_mapped_file_get_length(gmf); if (initrd_size >= initrd_max) { fprintf(stderr, "qemu: initrd is too large, cannot support." "(max: %"PRIu32", need %"PRId64")\n",