From patchwork Mon Mar 20 17:05:56 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laszlo Ersek X-Patchwork-Id: 741085 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3vn2Sx3G5wz9ryv for ; Tue, 21 Mar 2017 04:08:01 +1100 (AEDT) Received: from localhost ([::1]:34085 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cq0mk-0001EO-Pi for incoming@patchwork.ozlabs.org; Mon, 20 Mar 2017 13:07:58 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:38942) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cq0l1-0000Ic-QC for qemu-devel@nongnu.org; Mon, 20 Mar 2017 13:06:13 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cq0l0-0006h3-1Z for qemu-devel@nongnu.org; Mon, 20 Mar 2017 13:06:11 -0400 Received: from mx1.redhat.com ([209.132.183.28]:60482) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cq0kz-0006gd-PW for qemu-devel@nongnu.org; Mon, 20 Mar 2017 13:06:09 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id D037583F42; Mon, 20 Mar 2017 17:06:09 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com D037583F42 Authentication-Results: ext-mx03.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx03.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=lersek@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com D037583F42 Received: from lacos-laptop-7.usersys.redhat.com (ovpn-116-55.phx2.redhat.com [10.3.116.55]) by smtp.corp.redhat.com (Postfix) with ESMTP id 06A3183800; Mon, 20 Mar 2017 17:06:06 +0000 (UTC) From: Laszlo Ersek To: qemu devel list Date: Mon, 20 Mar 2017 18:05:56 +0100 Message-Id: <20170320170557.15645-2-lersek@redhat.com> In-Reply-To: <20170320170557.15645-1-lersek@redhat.com> References: <20170320170557.15645-1-lersek@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Mon, 20 Mar 2017 17:06:10 +0000 (UTC) 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 1/2] hw/acpi/vmgenid: prevent device realization on pre-2.5 machine types 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: Igor Mammedov , Paolo Bonzini , Ben Warren , "Michael S. Tsirkin" Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" The WRITE_POINTER linker/loader command that underlies VMGENID depends on commit baf2d5bfbac0 ("fw-cfg: support writeable blobs", 2017-01-12), which in turn depends on fw_cfg DMA. DMA for fw_cfg is enabled in 2.5+ machine types only (see commit e6915b5f3a87, "fw_cfg: unbreak migration compatibility for 2.4 and earlier machines", 2016-02-18). Cc: "Michael S. Tsirkin" Cc: Ben Warren Cc: Igor Mammedov Cc: Paolo Bonzini Signed-off-by: Laszlo Ersek Reviewed-by: Igor Mammedov Reviewed-by: Ben Warren > --- Notes: v2: - disable/enable vmgenid exactly in parallel with DMA support for fw_cfg [Michael, Paolo] include/hw/acpi/vmgenid.h | 1 + include/hw/compat.h | 4 ++++ hw/acpi/vmgenid.c | 14 ++++++++++++++ 3 files changed, 19 insertions(+) diff --git a/include/hw/acpi/vmgenid.h b/include/hw/acpi/vmgenid.h index db7fa0e63303..8578476baebe 100644 --- a/include/hw/acpi/vmgenid.h +++ b/include/hw/acpi/vmgenid.h @@ -21,6 +21,7 @@ typedef struct VmGenIdState { DeviceClass parent_obj; QemuUUID guid; /* The 128-bit GUID seen by the guest */ uint8_t vmgenid_addr_le[8]; /* Address of the GUID (little-endian) */ + bool write_pointer_available; } VmGenIdState; static inline Object *find_vmgenid_dev(void) diff --git a/include/hw/compat.h b/include/hw/compat.h index fc8c3e060007..5d5be91daf59 100644 --- a/include/hw/compat.h +++ b/include/hw/compat.h @@ -131,6 +131,10 @@ .driver = "fw_cfg_io",\ .property = "dma_enabled",\ .value = "off",\ + },{\ + .driver = "vmgenid",\ + .property = "x-write-pointer-available",\ + .value = "off",\ }, #define HW_COMPAT_2_3 \ diff --git a/hw/acpi/vmgenid.c b/hw/acpi/vmgenid.c index 7a3ad17d66ef..c3ddcc8e7cb0 100644 --- a/hw/acpi/vmgenid.c +++ b/hw/acpi/vmgenid.c @@ -205,9 +205,22 @@ static void vmgenid_handle_reset(void *opaque) memset(vms->vmgenid_addr_le, 0, ARRAY_SIZE(vms->vmgenid_addr_le)); } +static Property vmgenid_properties[] = { + 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 = VMGENID(dev); + + if (!vms->write_pointer_available) { + error_setg(errp, "%s requires DMA write support in fw_cfg, " + "which this machine type does not provide", VMGENID_DEVICE); + return; + } + qemu_register_reset(vmgenid_handle_reset, vms); } @@ -218,6 +231,7 @@ static void vmgenid_device_class_init(ObjectClass *klass, void *data) dc->vmsd = &vmstate_vmgenid; dc->realize = vmgenid_realize; dc->hotpluggable = false; + dc->props = vmgenid_properties; object_class_property_add_str(klass, VMGENID_GUID, NULL, vmgenid_set_guid, NULL);