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backends/iommufd: Introduce iommufd_backend_alloc_vdev

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Add a helper to allocate an iommufd device's virtual device (in the user
space) per a viommu instance.

While at it, introduce a struct IOMMUFDVdev for later use by vendor
IOMMU implementations.

Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Tested-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Shameer Kolothum <skolothumtho@nvidia.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>
Message-id: 20260126104342.253965-3-skolothumtho@nvidia.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Nicolin Chen
2026-01-29 13:32:04 +00:00
committed by Peter Maydell
parent f2d31df0d9
commit cd438bf9bd
3 changed files with 40 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
backends/iommufd.c
View File

@@ -473,6 +473,33 @@ bool iommufd_backend_alloc_viommu(IOMMUFDBackend *be, uint32_t dev_id,
return true;
}
bool iommufd_backend_alloc_vdev(IOMMUFDBackend *be, uint32_t dev_id,
uint32_t viommu_id, uint64_t virt_id,
uint32_t *out_vdev_id, Error **errp)
{
int ret;
struct iommu_vdevice_alloc alloc_vdev = {
.size = sizeof(alloc_vdev),
.viommu_id = viommu_id,
.dev_id = dev_id,
.virt_id = virt_id,
};
ret = ioctl(be->fd, IOMMU_VDEVICE_ALLOC, &alloc_vdev);
trace_iommufd_backend_alloc_vdev(be->fd, dev_id, viommu_id, virt_id,
alloc_vdev.out_vdevice_id, ret);
if (ret) {
error_setg_errno(errp, errno, "IOMMU_VDEVICE_ALLOC failed");
return false;
}
g_assert(out_vdev_id);
*out_vdev_id = alloc_vdev.out_vdevice_id;
return true;
}
bool host_iommu_device_iommufd_attach_hwpt(HostIOMMUDeviceIOMMUFD *idev,
uint32_t hwpt_id, Error **errp)
{

1
backends/trace-events
View File

@@ -22,3 +22,4 @@ iommufd_backend_set_dirty(int iommufd, uint32_t hwpt_id, bool start, int ret) "
iommufd_backend_get_dirty_bitmap(int iommufd, uint32_t hwpt_id, uint64_t iova, uint64_t size, uint64_t flags, uint64_t page_size, int ret) " iommufd=%d hwpt=%u iova=0x%"PRIx64" size=0x%"PRIx64" flags=0x%"PRIx64" page_size=0x%"PRIx64" (%d)"
iommufd_backend_invalidate_cache(int iommufd, uint32_t id, uint32_t data_type, uint32_t entry_len, uint32_t entry_num, uint32_t done_num, uint64_t data_ptr, int ret) " iommufd=%d id=%u data_type=%u entry_len=%u entry_num=%u done_num=%u data_ptr=0x%"PRIx64" (%d)"
iommufd_backend_alloc_viommu(int iommufd, uint32_t dev_id, uint32_t type, uint32_t hwpt_id, uint32_t viommu_id, int ret) " iommufd=%d type=%u dev_id=%u hwpt_id=%u viommu_id=%u (%d)"
iommufd_backend_alloc_vdev(int iommufd, uint32_t dev_id, uint32_t viommu_id, uint64_t virt_id, uint32_t vdev_id, int ret) " iommufd=%d dev_id=%u viommu_id=%u virt_id=0x%"PRIx64" vdev_id=%u (%d)"

12
include/system/iommufd.h
View File

@@ -48,6 +48,14 @@ typedef struct IOMMUFDViommu {
uint32_t viommu_id; /* virtual IOMMU ID of allocated object */
} IOMMUFDViommu;
/*
* Virtual device object for a physical device bind to a vIOMMU.
*/
typedef struct IOMMUFDVdev {
uint32_t vdevice_id; /* object handle for vDevice */
uint32_t virt_id; /* virtual device ID */
} IOMMUFDVdev;
bool iommufd_backend_connect(IOMMUFDBackend *be, Error **errp);
void iommufd_backend_disconnect(IOMMUFDBackend *be);
@@ -73,6 +81,10 @@ bool iommufd_backend_alloc_viommu(IOMMUFDBackend *be, uint32_t dev_id,
uint32_t viommu_type, uint32_t hwpt_id,
uint32_t *out_hwpt, Error **errp);
bool iommufd_backend_alloc_vdev(IOMMUFDBackend *be, uint32_t dev_id,
uint32_t viommu_id, uint64_t virt_id,
uint32_t *out_vdev_id, Error **errp);
bool iommufd_backend_set_dirty_tracking(IOMMUFDBackend *be, uint32_t hwpt_id,
bool start, Error **errp);
bool iommufd_backend_get_dirty_bitmap(IOMMUFDBackend *be, uint32_t hwpt_id,