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([2a01:e0a:59e:9d80:527b:9dff:feef:3874]) by smtp.gmail.com with ESMTPSA id af79cd13be357-794f3172d05sm279816285a.113.2024.06.03.05.46.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 03 Jun 2024 05:46:18 -0700 (PDT) Message-ID: <43b7e164-9657-4368-9baa-fd83bedb2066@redhat.com> Date: Mon, 3 Jun 2024 14:46:13 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 01/19] backends: Introduce HostIOMMUDevice abstract Content-Language: en-US To: Zhenzhong Duan , qemu-devel@nongnu.org Cc: alex.williamson@redhat.com, clg@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 References: <20240603061023.269738-1-zhenzhong.duan@intel.com> <20240603061023.269738-2-zhenzhong.duan@intel.com> From: Eric Auger In-Reply-To: <20240603061023.269738-2-zhenzhong.duan@intel.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=170.10.133.124; envelope-from=eric.auger@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: eric.auger@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 6/3/24 08:10, 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 > Signed-off-by: Zhenzhong Duan > --- > 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/MAINTAINERS b/MAINTAINERS > index 448dc951c5..1cf2b25beb 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -2196,6 +2196,8 @@ M: Zhenzhong Duan > S: Supported > F: backends/iommufd.c > F: include/sysemu/iommufd.h > +F: backends/host_iommu_device.c > +F: include/sysemu/host_iommu_device.h > F: include/qemu/chardev_open.h > F: util/chardev_open.c > F: docs/devel/vfio-iommufd.rst > 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 > + * > + * 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 s/type/types > + * with different backend (e.g., VFIO legacy container or IOMMUFD backend) > + * can have different sub-classes. will have different implementations of the HostIOMMUDeviceClass? > + */ > +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 VFIO base device or VDPA device? > + * > + * @errp: pass an Error out when realize fails. > + * > + * Returns: true on success, false on failure. > + */ > + bool (*realize)(HostIOMMUDevice *hiod, void *opaque, Error **errp); I think I would introduce the get_cap API here as well to give a minimal consistency to the class API. > +}; > +#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 > + * > + * 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) > +{ > +} > diff --git a/backends/Kconfig b/backends/Kconfig > index 2cb23f62fa..34ab29e994 100644 > --- a/backends/Kconfig > +++ b/backends/Kconfig > @@ -3,3 +3,8 @@ source tpm/Kconfig > config IOMMUFD > bool > depends on VFIO > + > +config HOST_IOMMU_DEVICE > + bool > + default y > + depends on VFIO > diff --git a/backends/meson.build b/backends/meson.build > index 8b2b111497..2e975d641e 100644 > --- a/backends/meson.build > +++ b/backends/meson.build > @@ -25,6 +25,7 @@ if have_vhost_user > endif > system_ss.add(when: 'CONFIG_VIRTIO_CRYPTO', if_true: files('cryptodev-vhost.c')) > system_ss.add(when: 'CONFIG_IOMMUFD', if_true: files('iommufd.c')) > +system_ss.add(when: 'CONFIG_HOST_IOMMU_DEVICE', if_true: files('host_iommu_device.c')) > if have_vhost_user_crypto > system_ss.add(when: 'CONFIG_VIRTIO_CRYPTO', if_true: files('cryptodev-vhost-user.c')) > endif