From nobody Mon Feb 9 23:03:18 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.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; Authentication-Results: mx.zohomail.com; spf=pass (zoho.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 ARC-Seal: i=1; a=rsa-sha256; t=1563872891; cv=none; d=zoho.com; s=zohoarc; b=MpU8tLVZsK5aXLmW4JdyfetX7aEC7oG23NQFFn6fhRo8idrw2r5CU81spOxWtiQhM73xqwAFpKYKJv0+yQk9OBqEYDvzsR/nCgGBhLF1xiBBJgfu6OWD1oXNdZ9z0VehDp024LB7XkhkzuBhHaoqqeNHxFsCuMjPs9VXVg0bdEE= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1563872891; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To:ARC-Authentication-Results; bh=7Nr7hUbqtmtvob3/xkMQf4mvZpTKkrqtpUP/Z9MTuew=; b=I98lTA4YSZJ6WEj0kpfFvDkqH+Y3ULk1K0wTPdeQNRF2/lFTrSxrNgOWlfijJFeLQ9XKLJYEtmeImf/T84yGXyWz1/a5vY/ZER1cmA2FlZKcFnZQhStzCGDURaegTykHfDdUyie7WCwcfIQoeMuHcj5UdO/8H5PLxsDRagXcK48= ARC-Authentication-Results: i=1; mx.zoho.com; spf=pass (zoho.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 header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 156387289122098.90108563884121; Tue, 23 Jul 2019 02:08:11 -0700 (PDT) Received: from localhost ([::1]:40454 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hpqmH-0005Fg-PJ for importer@patchew.org; Tue, 23 Jul 2019 05:08:09 -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) 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 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+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" 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_s= ize - 1; if (initrd_size >=3D initrd_max) { fprintf(stderr, "qemu: initrd is too large, cannot sup= port." @@ -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