Re: [PATCH v2 1/3] qom: new object to associate device to numa node

[Alex Williamson <alex.williamson@redhat.com>]

On Sun, 8 Oct 2023 01:47:38 +0530
<ankita@nvidia.com> wrote:

> From: Ankit Agrawal <ankita@nvidia.com>
> 
> The CPU cache coherent device memory can be added as NUMA nodes
> distinct from the system memory nodes. These nodes are associated
> with the device and Qemu needs a way to maintain this link.
> 
> Introduce a new acpi-generic-initiator object to allow host admin
> provide the device and the corresponding NUMA node. Qemu maintain
> this association and use this object to build the requisite GI
> Affinity Structure.
> 
> The admin provides the id of the device and the NUMA node id such
> as in the following example.
> -device vfio-pci-nohotplug,host=<bdf>,bus=pcie.0,addr=04.0,rombar=0,id=dev0 \
> -object acpi-generic-initiator,id=gi0,device=dev0,node=2 \
> 
> Signed-off-by: Ankit Agrawal <ankita@nvidia.com>
> ---
>  hw/acpi/acpi-generic-initiator.c         | 74 ++++++++++++++++++++++++
>  hw/acpi/meson.build                      |  1 +
>  include/hw/acpi/acpi-generic-initiator.h | 30 ++++++++++
>  qapi/qom.json                            | 20 ++++++-
>  4 files changed, 123 insertions(+), 2 deletions(-)
>  create mode 100644 hw/acpi/acpi-generic-initiator.c
>  create mode 100644 include/hw/acpi/acpi-generic-initiator.h
> 
> diff --git a/hw/acpi/acpi-generic-initiator.c b/hw/acpi/acpi-generic-initiator.c
> new file mode 100644
> index 0000000000..6406736090
> --- /dev/null
> +++ b/hw/acpi/acpi-generic-initiator.c
> @@ -0,0 +1,74 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved
> + */
> +
> +#include "qemu/osdep.h"
> +#include "hw/qdev-properties.h"
> +#include "qapi/error.h"
> +#include "qapi/visitor.h"
> +#include "qom/object_interfaces.h"
> +#include "qom/object.h"
> +#include "hw/qdev-core.h"
> +#include "hw/vfio/vfio-common.h"
> +#include "hw/vfio/pci.h"
> +#include "hw/pci/pci_device.h"
> +#include "sysemu/numa.h"
> +#include "hw/acpi/acpi-generic-initiator.h"
> +
> +OBJECT_DEFINE_TYPE_WITH_INTERFACES(AcpiGenericInitiator, acpi_generic_initiator,
> +                   ACPI_GENERIC_INITIATOR, OBJECT,
> +                   { TYPE_USER_CREATABLE },
> +                   { NULL })
> +
> +OBJECT_DECLARE_SIMPLE_TYPE(AcpiGenericInitiator, ACPI_GENERIC_INITIATOR)
> +
> +static void acpi_generic_initiator_init(Object *obj)
> +{
> +    AcpiGenericInitiator *gi = ACPI_GENERIC_INITIATOR(obj);
> +    gi->device = NULL;
> +    gi->node = MAX_NODES;
> +    gi->node_count = 1;
> +}
> +
> +static void acpi_generic_initiator_finalize(Object *obj)
> +{
> +    AcpiGenericInitiator *gi = ACPI_GENERIC_INITIATOR(obj);
> +
> +    g_free(gi->device);
> +}
> +
> +static void acpi_generic_initiator_set_device(Object *obj, const char *value,
> +                                              Error **errp)
> +{
> +    AcpiGenericInitiator *gi = ACPI_GENERIC_INITIATOR(obj);
> +
> +    gi->device = g_strdup(value);
> +}
> +
> +static void acpi_generic_initiator_set_node(Object *obj, Visitor *v,
> +                                            const char *name, void *opaque,
> +                                            Error **errp)
> +{
> +    AcpiGenericInitiator *gi = ACPI_GENERIC_INITIATOR(obj);
> +    uint32_t value;
> +
> +    if (!visit_type_uint32(v, name, &value, errp)) {
> +        return;
> +    }
> +
> +    if (value >= MAX_NODES) {

error_setg() here?  Thanks,

Alex

> +        return;
> +    }
> +
> +    gi->node = value;
> +}
> +
> +static void acpi_generic_initiator_class_init(ObjectClass *oc, void *data)
> +{
> +    object_class_property_add_str(oc, ACPI_GENERIC_INITIATOR_DEVICE_PROP, NULL,
> +                                  acpi_generic_initiator_set_device);
> +    object_class_property_add(oc, ACPI_GENERIC_INITIATOR_NODE_PROP, "uint32",
> +                              NULL, acpi_generic_initiator_set_node, NULL,
> +                              NULL);
> +}
> diff --git a/hw/acpi/meson.build b/hw/acpi/meson.build
> index fc1b952379..22252836ed 100644
> --- a/hw/acpi/meson.build
> +++ b/hw/acpi/meson.build
> @@ -5,6 +5,7 @@ acpi_ss.add(files(
>    'bios-linker-loader.c',
>    'core.c',
>    'utils.c',
> +  'acpi-generic-initiator.c',
>  ))
>  acpi_ss.add(when: 'CONFIG_ACPI_CPU_HOTPLUG', if_true: files('cpu.c', 'cpu_hotplug.c'))
>  acpi_ss.add(when: 'CONFIG_ACPI_CPU_HOTPLUG', if_false: files('acpi-cpu-hotplug-stub.c'))
> diff --git a/include/hw/acpi/acpi-generic-initiator.h b/include/hw/acpi/acpi-generic-initiator.h
> new file mode 100644
> index 0000000000..e67e6e23b1
> --- /dev/null
> +++ b/include/hw/acpi/acpi-generic-initiator.h
> @@ -0,0 +1,30 @@
> +#ifndef ACPI_GENERIC_INITIATOR_H
> +#define ACPI_GENERIC_INITIATOR_H
> +
> +#include "hw/mem/pc-dimm.h"
> +#include "hw/acpi/bios-linker-loader.h"
> +#include "qemu/uuid.h"
> +#include "hw/acpi/aml-build.h"
> +#include "qom/object.h"
> +#include "qom/object_interfaces.h"
> +
> +#define TYPE_ACPI_GENERIC_INITIATOR "acpi-generic-initiator"
> +
> +#define ACPI_GENERIC_INITIATOR_DEVICE_PROP "device"
> +#define ACPI_GENERIC_INITIATOR_NODE_PROP "node"
> +
> +typedef struct AcpiGenericInitiator {
> +    /* private */
> +    Object parent;
> +
> +    /* public */
> +    char *device;
> +    uint32_t node;
> +    uint32_t node_count;
> +} AcpiGenericInitiator;
> +
> +typedef struct AcpiGenericInitiatorClass {
> +        ObjectClass parent_class;
> +} AcpiGenericInitiatorClass;
> +
> +#endif
> diff --git a/qapi/qom.json b/qapi/qom.json
> index fa3e88c8e6..86c87a161c 100644
> --- a/qapi/qom.json
> +++ b/qapi/qom.json
> @@ -779,6 +779,20 @@
>  { 'struct': 'VfioUserServerProperties',
>    'data': { 'socket': 'SocketAddress', 'device': 'str' } }
>  
> +##
> +# @AcpiGenericInitiatorProperties:
> +#
> +# Properties for acpi-generic-initiator objects.
> +#
> +# @device: the ID of the device to be associated with the node
> +#
> +# @node: the ID of the numa node
> +#
> +# Since: 8.0
> +##
> +{ 'struct': 'AcpiGenericInitiatorProperties',
> +  'data': { 'device': 'str', 'node': 'uint32' } }
> +
>  ##
>  # @RngProperties:
>  #
> @@ -947,7 +961,8 @@
>      'tls-creds-x509',
>      'tls-cipher-suites',
>      { 'name': 'x-remote-object', 'features': [ 'unstable' ] },
> -    { 'name': 'x-vfio-user-server', 'features': [ 'unstable' ] }
> +    { 'name': 'x-vfio-user-server', 'features': [ 'unstable' ] },
> +    'acpi-generic-initiator'
>    ] }
>  
>  ##
> @@ -1014,7 +1029,8 @@
>        'tls-creds-x509':             'TlsCredsX509Properties',
>        'tls-cipher-suites':          'TlsCredsProperties',
>        'x-remote-object':            'RemoteObjectProperties',
> -      'x-vfio-user-server':         'VfioUserServerProperties'
> +      'x-vfio-user-server':         'VfioUserServerProperties',
> +      'acpi-generic-initiator':     'AcpiGenericInitiatorProperties'
>    } }
>  
>  ##