From patchwork Sat Oct 4 20:24:36 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 396575 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 426CF140183 for ; Sun, 5 Oct 2014 07:33:10 +1100 (EST) Received: from localhost ([::1]:45236 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XaW0p-0003c4-Uv for incoming@patchwork.ozlabs.org; Sat, 04 Oct 2014 16:33:07 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:50789) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XaVtO-0005zY-9K for qemu-devel@nongnu.org; Sat, 04 Oct 2014 16:25:32 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XaVtC-0004fe-GP for qemu-devel@nongnu.org; Sat, 04 Oct 2014 16:25:26 -0400 Received: from mx1.redhat.com ([209.132.183.28]:20409) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XaVtC-0004fQ-9s for qemu-devel@nongnu.org; Sat, 04 Oct 2014 16:25:14 -0400 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id s94KPC72031103 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Sat, 4 Oct 2014 16:25:12 -0400 Received: from localhost (ovpn-112-23.ams2.redhat.com [10.36.112.23]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id s94KPBsh017269; Sat, 4 Oct 2014 16:25:11 -0400 From: Stefan Hajnoczi To: Date: Sat, 4 Oct 2014 21:24:36 +0100 Message-Id: <1412454289-1789-11-git-send-email-stefanha@redhat.com> In-Reply-To: <1412454289-1789-1-git-send-email-stefanha@redhat.com> References: <1412454289-1789-1-git-send-email-stefanha@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.23 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 209.132.183.28 Cc: Peter Maydell Subject: [Qemu-devel] [PULL 10/23] pc/vl: Add units-per-default-bus property X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org From: John Snow This patch adds the 'units_per_default_bus' property which allows individual boards to declare their desired index => (bus,unit) mapping for their default HBA, so that boards such as Q35 can specify that its default if_ide HBA, AHCI, only accepts one unit per bus. This property only overrides the mapping for drives matching the block_default_type interface. This patch also adds this property to *all* past and present Q35 machine types. This retroactive addition is justified because the previous erroneous index=>(bus,unit) mappings caused by lack of such a property were not utilized due to lack of initialization code in the Q35 init routine. Further, semantically, the Q35 board type has always had the property that its default HBA, AHCI, only accepts one unit per bus. The new code added to add devices to drives relies upon the accuracy of this mapping. Thus, the property is applied retroactively to reduce complexity of allowing IDE HBAs with different units per bus. Examples: Prior to this patch, all IDE HBAs were assumed to use 2 units per bus (Master, Slave). When using Q35 and AHCI, however, we only allow one unit per bus. -hdb foo.qcow2 would become index=1, or bus=0,unit=1. -hdd foo.qcow2 would become index=3, or bus=1,unit=1. -drive file=foo.qcow2,index=5 becomes bus=2,unit=1. These are invalid for AHCI. They now become, under Q35 only: -hdb foo.qcow2 --> index=1, bus=1, unit=0. -hdd foo.qcow2 --> index=3, bus=3, unit=0. -drive file=foo.qcow2,index=5 --> bus=5,unit=0. The mapping is adjusted based on the fact that the default IF for the Q35 machine type is IF_IDE, and units-per-default-bus overrides the IDE mapping from its default of 2 units per bus to just 1 unit per bus. Signed-off-by: John Snow Reviewed-by: Markus Armbruster Reviewed-by: Michael S. Tsirkin Message-id: 1412187569-23452-4-git-send-email-jsnow@redhat.com Signed-off-by: Stefan Hajnoczi --- hw/i386/pc.c | 1 + hw/i386/pc_q35.c | 3 ++- include/hw/boards.h | 2 ++ vl.c | 8 ++++++++ 4 files changed, 13 insertions(+), 1 deletion(-) diff --git a/hw/i386/pc.c b/hw/i386/pc.c index 82a7daa..d045e8b 100644 --- a/hw/i386/pc.c +++ b/hw/i386/pc.c @@ -1524,6 +1524,7 @@ static void pc_generic_machine_class_init(ObjectClass *oc, void *data) mc->hot_add_cpu = qm->hot_add_cpu; mc->kvm_type = qm->kvm_type; mc->block_default_type = qm->block_default_type; + mc->units_per_default_bus = qm->units_per_default_bus; mc->max_cpus = qm->max_cpus; mc->no_serial = qm->no_serial; mc->no_parallel = qm->no_parallel; diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c index d4a907c..b28ddbb 100644 --- a/hw/i386/pc_q35.c +++ b/hw/i386/pc_q35.c @@ -344,7 +344,8 @@ static void pc_q35_init_1_4(MachineState *machine) #define PC_Q35_MACHINE_OPTIONS \ PC_DEFAULT_MACHINE_OPTIONS, \ .desc = "Standard PC (Q35 + ICH9, 2009)", \ - .hot_add_cpu = pc_hot_add_cpu + .hot_add_cpu = pc_hot_add_cpu, \ + .units_per_default_bus = 1 #define PC_Q35_2_2_MACHINE_OPTIONS \ PC_Q35_MACHINE_OPTIONS, \ diff --git a/include/hw/boards.h b/include/hw/boards.h index dfb6718..663f16a 100644 --- a/include/hw/boards.h +++ b/include/hw/boards.h @@ -28,6 +28,7 @@ struct QEMUMachine { QEMUMachineHotAddCPUFunc *hot_add_cpu; QEMUMachineGetKvmtypeFunc *kvm_type; BlockInterfaceType block_default_type; + int units_per_default_bus; int max_cpus; unsigned int no_serial:1, no_parallel:1, @@ -86,6 +87,7 @@ struct MachineClass { int (*kvm_type)(const char *arg); BlockInterfaceType block_default_type; + int units_per_default_bus; int max_cpus; unsigned int no_serial:1, no_parallel:1, diff --git a/vl.c b/vl.c index 4bc8f97..debcbcc 100644 --- a/vl.c +++ b/vl.c @@ -1585,6 +1585,7 @@ static void machine_class_init(ObjectClass *oc, void *data) mc->hot_add_cpu = qm->hot_add_cpu; mc->kvm_type = qm->kvm_type; mc->block_default_type = qm->block_default_type; + mc->units_per_default_bus = qm->units_per_default_bus; mc->max_cpus = qm->max_cpus; mc->no_serial = qm->no_serial; mc->no_parallel = qm->no_parallel; @@ -4375,6 +4376,13 @@ int main(int argc, char **argv, char **envp) blk_mig_init(); ram_mig_init(); + /* If the currently selected machine wishes to override the units-per-bus + * property of its default HBA interface type, do so now. */ + if (machine_class->units_per_default_bus) { + override_max_devs(machine_class->block_default_type, + machine_class->units_per_default_bus); + } + /* open the virtual block devices */ if (snapshot) qemu_opts_foreach(qemu_find_opts("drive"), drive_enable_snapshot, NULL, 0);