From: "Philippe Mathieu-Daudé" <philmd@linaro.org>
To: Zhenzhong Duan <zhenzhong.duan@intel.com>,
qemu-devel@nongnu.org, Markus Armbruster <armbru@redhat.com>
Cc: alex.williamson@redhat.com, clg@redhat.com,
eric.auger@redhat.com, mst@redhat.com, peterx@redhat.com,
jasowang@redhat.com, jgg@nvidia.com, nicolinc@nvidia.com,
joao.m.martins@oracle.com, clement.mathieu--drif@eviden.com,
kevin.tian@intel.com, yi.l.liu@intel.com, chao.p.peng@intel.com,
Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [PATCH v4 01/19] backends: Introduce HostIOMMUDevice abstract
Date: Tue, 7 May 2024 11:44:39 +0200 [thread overview]
Message-ID: <264a1de0-1c1e-44bc-bf9b-f1082b9e0e9a@linaro.org> (raw)
In-Reply-To: <20240507092043.1172717-2-zhenzhong.duan@intel.com>
Hi Zhenzhong,
On 7/5/24 11:20, Zhenzhong Duan wrote:
> Introduce HostIOMMUDevice as an abstraction of host IOMMU device.
>
> Introduce .realize() to initialize HostIOMMUDevice further after
> instance init.
>
> Introduce a macro CONFIG_HOST_IOMMU_DEVICE to define the usage
> for VFIO, and VDPA in the future.
>
> Suggested-by: Cédric Le Goater <clg@redhat.com>
> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
> ---
> MAINTAINERS | 2 ++
> include/sysemu/host_iommu_device.h | 51 ++++++++++++++++++++++++++++++
> backends/host_iommu_device.c | 30 ++++++++++++++++++
> backends/Kconfig | 5 +++
> backends/meson.build | 1 +
> 5 files changed, 89 insertions(+)
> create mode 100644 include/sysemu/host_iommu_device.h
> create mode 100644 backends/host_iommu_device.c
> diff --git a/include/sysemu/host_iommu_device.h b/include/sysemu/host_iommu_device.h
> new file mode 100644
> index 0000000000..2b58a94d62
> --- /dev/null
> +++ b/include/sysemu/host_iommu_device.h
> @@ -0,0 +1,51 @@
> +/*
> + * Host IOMMU device abstract declaration
> + *
> + * Copyright (C) 2024 Intel Corporation.
> + *
> + * Authors: Zhenzhong Duan <zhenzhong.duan@intel.com>
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2. See
> + * the COPYING file in the top-level directory.
> + */
> +
> +#ifndef HOST_IOMMU_DEVICE_H
> +#define HOST_IOMMU_DEVICE_H
> +
> +#include "qom/object.h"
> +#include "qapi/error.h"
> +
> +#define TYPE_HOST_IOMMU_DEVICE "host-iommu-device"
> +OBJECT_DECLARE_TYPE(HostIOMMUDevice, HostIOMMUDeviceClass, HOST_IOMMU_DEVICE)
> +
> +struct HostIOMMUDevice {
> + Object parent_obj;
> +};
> +
> +/**
> + * struct HostIOMMUDeviceClass - The base class for all host IOMMU devices.
> + *
> + * Different type of host devices (e.g., VFIO or VDPA device) or devices
> + * with different backend (e.g., VFIO legacy container or IOMMUFD backend)
> + * can have different sub-classes.
> + */
> +struct HostIOMMUDeviceClass {
> + ObjectClass parent_class;
> +
> + /**
> + * @realize: initialize host IOMMU device instance further.
> + *
> + * Mandatory callback.
> + *
> + * @hiod: pointer to a host IOMMU device instance.
> + *
> + * @opaque: pointer to agent device of this host IOMMU device,
> + * i.e., for VFIO, pointer to VFIODevice
> + *
> + * @errp: pass an Error out when realize fails.
> + *
> + * Returns: true on success, false on failure.
> + */
> + bool (*realize)(HostIOMMUDevice *hiod, void *opaque, Error **errp);
> +};
> +#endif
> diff --git a/backends/host_iommu_device.c b/backends/host_iommu_device.c
> new file mode 100644
> index 0000000000..41f2fdce20
> --- /dev/null
> +++ b/backends/host_iommu_device.c
> @@ -0,0 +1,30 @@
> +/*
> + * Host IOMMU device abstract
> + *
> + * Copyright (C) 2024 Intel Corporation.
> + *
> + * Authors: Zhenzhong Duan <zhenzhong.duan@intel.com>
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2. See
> + * the COPYING file in the top-level directory.
> + */
> +
> +#include "qemu/osdep.h"
> +#include "sysemu/host_iommu_device.h"
> +
> +OBJECT_DEFINE_ABSTRACT_TYPE(HostIOMMUDevice,
> + host_iommu_device,
> + HOST_IOMMU_DEVICE,
> + OBJECT)
> +
> +static void host_iommu_device_class_init(ObjectClass *oc, void *data)
> +{
> +}
> +
> +static void host_iommu_device_init(Object *obj)
> +{
> +}
> +
> +static void host_iommu_device_finalize(Object *obj)
> +{
> +}
All these stubs call for a QOM interface design instead
of inheritance IMHO. See INTERFACE_CHECK in "qom/object.h".
But maybe I misunderstood this series :)
next prev parent reply other threads:[~2024-05-07 9:44 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-07 9:20 [PATCH v4 00/19] Add a host IOMMU device abstraction to check with vIOMMU Zhenzhong Duan
2024-05-07 9:20 ` [PATCH v4 01/19] backends: Introduce HostIOMMUDevice abstract Zhenzhong Duan
2024-05-07 9:44 ` Philippe Mathieu-Daudé [this message]
2024-05-07 10:25 ` Duan, Zhenzhong
2024-05-07 9:20 ` [PATCH v4 02/19] vfio/container: Introduce TYPE_HOST_IOMMU_DEVICE_LEGACY_VFIO device Zhenzhong Duan
2024-05-07 12:16 ` Cédric Le Goater
2024-05-07 9:20 ` [PATCH v4 03/19] backends/iommufd: Introduce abstract TYPE_HOST_IOMMU_DEVICE_IOMMUFD device Zhenzhong Duan
2024-05-07 9:20 ` [PATCH v4 04/19] vfio/iommufd: Introduce TYPE_HOST_IOMMU_DEVICE_IOMMUFD_VFIO device Zhenzhong Duan
2024-05-07 12:19 ` Cédric Le Goater
2024-05-08 6:21 ` Duan, Zhenzhong
2024-05-07 9:20 ` [PATCH v4 05/19] backends/host_iommu_device: Introduce HostIOMMUDeviceCaps Zhenzhong Duan
2024-05-07 9:20 ` [PATCH v4 06/19] range: Introduce range_get_last_bit() Zhenzhong Duan
2024-05-07 9:20 ` [PATCH v4 07/19] vfio/container: Implement HostIOMMUDeviceClass::realize() handler Zhenzhong Duan
2024-05-07 9:20 ` [PATCH v4 08/19] backends/iommufd: Introduce helper function iommufd_backend_get_device_info() Zhenzhong Duan
2024-05-07 12:17 ` Cédric Le Goater
2024-05-07 9:20 ` [PATCH v4 09/19] vfio/iommufd: Implement HostIOMMUDeviceClass::realize() handler Zhenzhong Duan
2024-05-07 9:20 ` [PATCH v4 10/19] vfio/container: Implement HostIOMMUDeviceClass::get_cap() handler Zhenzhong Duan
2024-05-07 9:20 ` [PATCH v4 11/19] backends/iommufd: " Zhenzhong Duan
2024-05-07 9:20 ` [PATCH v4 12/19] vfio: Introduce VFIOIOMMUClass::hiod_typename attribute Zhenzhong Duan
2024-05-07 9:20 ` [PATCH v4 13/19] vfio: Create host IOMMU device instance Zhenzhong Duan
2024-05-07 9:20 ` [PATCH v4 14/19] hw/pci: Introduce helper function pci_device_get_iommu_bus_devfn() Zhenzhong Duan
2024-05-07 9:20 ` [PATCH v4 15/19] hw/pci: Introduce pci_device_[set|unset]_iommu_device() Zhenzhong Duan
2024-05-07 11:22 ` Cédric Le Goater
2024-05-07 9:20 ` [PATCH v4 16/19] vfio/pci: Pass HostIOMMUDevice to vIOMMU Zhenzhong Duan
2024-05-07 9:20 ` [PATCH v4 17/19] intel_iommu: Extract out vtd_cap_init() to initialize cap/ecap Zhenzhong Duan
2024-05-07 9:20 ` [PATCH v4 18/19] intel_iommu: Implement [set|unset]_iommu_device() callbacks Zhenzhong Duan
2024-05-07 9:20 ` [PATCH v4 19/19] intel_iommu: Check compatibility with host IOMMU capabilities Zhenzhong Duan
2024-05-07 11:39 ` CLEMENT MATHIEU--DRIF
2024-05-08 6:30 ` Duan, Zhenzhong
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