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vfio/iommufd: Add properties and handlers to TYPE_HOST_IOMMU_DEVICE_IOMMUFD

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Enhance HostIOMMUDeviceIOMMUFD object with 3 new members, specific
to the iommufd BE + 2 new class functions.

IOMMUFD BE includes IOMMUFD handle, devid and hwpt_id. IOMMUFD handle
and devid are used to allocate/free ioas and hwpt. hwpt_id is used to
re-attach IOMMUFD backed device to its default VFIO sub-system created
hwpt, i.e., when vIOMMU is disabled by guest. These properties are
initialized in hiod::realize() after attachment.

2 new class functions are [at|de]tach_hwpt(). They are used to
attach/detach hwpt. VFIO and VDPA can have different implementions,
so implementation will be in sub-class instead of HostIOMMUDeviceIOMMUFD,
e.g., in HostIOMMUDeviceIOMMUFDVFIO.

Add two wrappers host_iommu_device_iommufd_[at|de]tach_hwpt to wrap the
two functions.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250604062115.4004200-3-zhenzhong.duan@intel.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Zhenzhong Duan 2025-06-04 14:21:13 +08:00 • committed by Cédric Le Goater
parent 5c47679cb6
commit 98962d6298
3 changed files with 78 additions and 0 deletions
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50
include/system/iommufd.h
View file

@ -67,4 +67,54 @@ bool iommufd_backend_invalidate_cache(IOMMUFDBackend *be, uint32_t id,
Error **errp);
#define TYPE_HOST_IOMMU_DEVICE_IOMMUFD TYPE_HOST_IOMMU_DEVICE "-iommufd"
OBJECT_DECLARE_TYPE(HostIOMMUDeviceIOMMUFD, HostIOMMUDeviceIOMMUFDClass,
HOST_IOMMU_DEVICE_IOMMUFD)
/* Overload of the host IOMMU device for the iommufd backend */
struct HostIOMMUDeviceIOMMUFD {
HostIOMMUDevice parent_obj;
IOMMUFDBackend *iommufd;
uint32_t devid;
uint32_t hwpt_id;
};
struct HostIOMMUDeviceIOMMUFDClass {
HostIOMMUDeviceClass parent_class;
/**
* @attach_hwpt: attach host IOMMU device to IOMMUFD hardware page table.
* VFIO and VDPA device can have different implementation.
*
* Mandatory callback.
*
* @idev: host IOMMU device backed by IOMMUFD backend.
*
* @hwpt_id: ID of IOMMUFD hardware page table.
*
* @errp: pass an Error out when attachment fails.
*
* Returns: true on success, false on failure.
*/
bool (*attach_hwpt)(HostIOMMUDeviceIOMMUFD *idev, uint32_t hwpt_id,
Error **errp);
/**
* @detach_hwpt: detach host IOMMU device from IOMMUFD hardware page table.
* VFIO and VDPA device can have different implementation.
*
* Mandatory callback.
*
* @idev: host IOMMU device backed by IOMMUFD backend.
*
* @errp: pass an Error out when attachment fails.
*
* Returns: true on success, false on failure.
*/
bool (*detach_hwpt)(HostIOMMUDeviceIOMMUFD *idev, Error **errp);
};
bool host_iommu_device_iommufd_attach_hwpt(HostIOMMUDeviceIOMMUFD *idev,
uint32_t hwpt_id, Error **errp);
bool host_iommu_device_iommufd_detach_hwpt(HostIOMMUDeviceIOMMUFD *idev,
Error **errp);
#endif