From nobody Wed Nov 5 10:07:49 2025 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 Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1499336287122101.04555192089538; Thu, 6 Jul 2017 03:18:07 -0700 (PDT) Received: from localhost ([::1]:50434 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dT3rJ-0005GL-LZ for importer@patchew.org; Thu, 06 Jul 2017 06:18:05 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:35203) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dT3pf-0004JI-PN for qemu-devel@nongnu.org; Thu, 06 Jul 2017 06:16:25 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dT3pe-0000Pz-HX for qemu-devel@nongnu.org; Thu, 06 Jul 2017 06:16:23 -0400 Received: from mx1.redhat.com ([209.132.183.28]:51754) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dT3pe-0000PD-7s for qemu-devel@nongnu.org; Thu, 06 Jul 2017 06:16:22 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 336A78046E; Thu, 6 Jul 2017 10:16:21 +0000 (UTC) Received: from localhost (ovpn-112-36.ams2.redhat.com [10.36.112.36]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1020660BE7; Thu, 6 Jul 2017 10:16:16 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 336A78046E Authentication-Results: ext-mx04.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx04.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=marcandre.lureau@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com 336A78046E From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= To: qemu-devel@nongnu.org Date: Thu, 6 Jul 2017 12:16:05 +0200 Message-Id: <20170706101611.27031-2-marcandre.lureau@redhat.com> In-Reply-To: <20170706101611.27031-1-marcandre.lureau@redhat.com> References: <20170706101611.27031-1-marcandre.lureau@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.28]); Thu, 06 Jul 2017 10:16:21 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v2 1/7] vmgenid: replace x-write-pointer-available hack 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: ehabkost@redhat.com, Ben Warren , "Michael S. Tsirkin" , anderson@redhat.com, =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , imammedo@redhat.com, lersek@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Type: text/plain; charset="utf-8" This compat property sole function is to prevent the device from being instantiated. Instead of requiring an extra compat property, check if fw_cfg has DMA enabled. fw_cfg is a built-in device that is initialized very early by the machine init code. We have at least one other device that also assumes fw_cfg_find() can be safely used on realize: pvpanic. This has the additional benefit of handling other cases properly, like: $ qemu-system-x86_64 -device vmgenid -machine none qemu-system-x86_64: -device vmgenid: vmgenid requires DMA write support i= n fw_cfg, which this machine type does not provide $ qemu-system-x86_64 -device vmgenid -machine pc-i440fx-2.9 -global fw_cf= g.dma_enabled=3Doff qemu-system-x86_64: -device vmgenid: vmgenid requires DMA write support i= n fw_cfg, which this machine type does not provide $ qemu-system-x86_64 -device vmgenid -machine pc-i440fx-2.6 -global fw_cf= g.dma_enabled=3Don [boots normally] Suggested-by: Eduardo Habkost Signed-off-by: Marc-Andr=C3=A9 Lureau Reviewed-by: Michael S. Tsirkin Reviewed-by: Eduardo Habkost Reviewed-by: Ben Warren Reviewed-by: Laszlo Ersek --- include/hw/acpi/bios-linker-loader.h | 2 ++ include/hw/compat.h | 4 ---- hw/acpi/bios-linker-loader.c | 10 ++++++++++ hw/acpi/vmgenid.c | 9 +-------- 4 files changed, 13 insertions(+), 12 deletions(-) diff --git a/include/hw/acpi/bios-linker-loader.h b/include/hw/acpi/bios-li= nker-loader.h index efe17b0b9c..a711dbced8 100644 --- a/include/hw/acpi/bios-linker-loader.h +++ b/include/hw/acpi/bios-linker-loader.h @@ -7,6 +7,8 @@ typedef struct BIOSLinker { GArray *file_list; } BIOSLinker; =20 +bool bios_linker_loader_can_write_pointer(void); + BIOSLinker *bios_linker_loader_init(void); =20 void bios_linker_loader_alloc(BIOSLinker *linker, diff --git a/include/hw/compat.h b/include/hw/compat.h index 08f36004da..f414786604 100644 --- a/include/hw/compat.h +++ b/include/hw/compat.h @@ -150,10 +150,6 @@ .driver =3D "fw_cfg_io",\ .property =3D "dma_enabled",\ .value =3D "off",\ - },{\ - .driver =3D "vmgenid",\ - .property =3D "x-write-pointer-available",\ - .value =3D "off",\ }, =20 #define HW_COMPAT_2_3 \ diff --git a/hw/acpi/bios-linker-loader.c b/hw/acpi/bios-linker-loader.c index 046183a0f1..388d932538 100644 --- a/hw/acpi/bios-linker-loader.c +++ b/hw/acpi/bios-linker-loader.c @@ -168,6 +168,16 @@ bios_linker_find_file(const BIOSLinker *linker, const = char *name) return NULL; } =20 +/* + * board code must realize fw_cfg first, as a fixed device, before + * another device realize function call bios_linker_loader_can_write_point= er() +*/ +bool bios_linker_loader_can_write_pointer(void) +{ + FWCfgState *fw_cfg =3D fw_cfg_find(); + return fw_cfg && fw_cfg_dma_enabled(fw_cfg); +} + /* * bios_linker_loader_alloc: ask guest to load file into guest memory. * diff --git a/hw/acpi/vmgenid.c b/hw/acpi/vmgenid.c index a32b847fe0..ab5da293fd 100644 --- a/hw/acpi/vmgenid.c +++ b/hw/acpi/vmgenid.c @@ -205,17 +205,11 @@ static void vmgenid_handle_reset(void *opaque) memset(vms->vmgenid_addr_le, 0, ARRAY_SIZE(vms->vmgenid_addr_le)); } =20 -static Property vmgenid_properties[] =3D { - DEFINE_PROP_BOOL("x-write-pointer-available", VmGenIdState, - write_pointer_available, true), - DEFINE_PROP_END_OF_LIST(), -}; - static void vmgenid_realize(DeviceState *dev, Error **errp) { VmGenIdState *vms =3D VMGENID(dev); =20 - if (!vms->write_pointer_available) { + if (!bios_linker_loader_can_write_pointer()) { error_setg(errp, "%s requires DMA write support in fw_cfg, " "which this machine type does not provide", VMGENID_DEV= ICE); return; @@ -239,7 +233,6 @@ static void vmgenid_device_class_init(ObjectClass *klas= s, void *data) dc->vmsd =3D &vmstate_vmgenid; dc->realize =3D vmgenid_realize; dc->hotpluggable =3D false; - dc->props =3D vmgenid_properties; =20 object_class_property_add_str(klass, VMGENID_GUID, NULL, vmgenid_set_guid, NULL); --=20 2.13.1.395.gf7b71de06