From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, UNWANTED_LANGUAGE_BODY autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E8935C7618B for ; Tue, 23 Jul 2019 14:05:42 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 C002821738 for ; Tue, 23 Jul 2019 14:05:42 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C002821738 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:42784 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hpvQD-0000nx-NW for qemu-devel@archiver.kernel.org; Tue, 23 Jul 2019 10:05:41 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:43441) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hpvPv-0008LZ-5Q for qemu-devel@nongnu.org; Tue, 23 Jul 2019 10:05:24 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hpvPq-0005nl-9k for qemu-devel@nongnu.org; Tue, 23 Jul 2019 10:05:23 -0400 Received: from mx1.redhat.com ([209.132.183.28]:58248) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hpvPq-0005nV-2s for qemu-devel@nongnu.org; Tue, 23 Jul 2019 10:05:18 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 668B485542; Tue, 23 Jul 2019 14:05:17 +0000 (UTC) Received: from steredhat.redhat.com (ovpn-116-45.ams2.redhat.com [10.36.116.45]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4152E5D704; Tue, 23 Jul 2019 14:05:02 +0000 (UTC) From: Stefano Garzarella To: qemu-devel@nongnu.org Date: Tue, 23 Jul 2019 16:04:45 +0200 Message-Id: <20190723140445.12748-3-sgarzare@redhat.com> In-Reply-To: <20190723140445.12748-1-sgarzare@redhat.com> References: <20190723140445.12748-1-sgarzare@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.28]); Tue, 23 Jul 2019 14:05:17 +0000 (UTC) Content-Transfer-Encoding: quoted-printable 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 v2 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: Peter Maydell , Eduardo Habkost , Sergio Lopez , "Michael S. Tsirkin" , Julio Montes , "Dr . David Alan Gilbert" , Paolo Bonzini , Richard Henderson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" 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, =20 /* load initrd */ if (initrd_filename) { + GMappedFile *gmf; gsize initrd_size; gchar *initrd_data; GError *gerr =3D NULL; =20 - if (!g_file_get_contents(initrd_filename, &initrd_data, - &initrd_size, &gerr)) { + gmf =3D 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); } =20 + initrd_data =3D g_mapped_file_get_contents(gmf); + initrd_size =3D g_mapped_file_get_length(gmf); initrd_max =3D pcms->below_4g_mem_size - pcmc->acpi_data= _size - 1; if (initrd_size >=3D initrd_max) { fprintf(stderr, "qemu: initrd is too large, cannot s= upport." @@ -1378,6 +1381,7 @@ static void load_linux(PCMachineState *pcms, =20 /* load initrd */ if (initrd_filename) { + GMappedFile *gmf; gsize initrd_size; gchar *initrd_data; GError *gerr =3D NULL; @@ -1387,12 +1391,15 @@ static void load_linux(PCMachineState *pcms, exit(1); } =20 - if (!g_file_get_contents(initrd_filename, &initrd_data, - &initrd_size, &gerr)) { + gmf =3D 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 =3D g_mapped_file_get_contents(gmf); + initrd_size =3D g_mapped_file_get_length(gmf); if (initrd_size >=3D initrd_max) { fprintf(stderr, "qemu: initrd is too large, cannot support." "(max: %"PRIu32", need %"PRId64")\n", --=20 2.20.1