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backends/iommufd: Introduce iommufd_backend_alloc_veventq

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Add a new helper for IOMMU_VEVENTQ_ALLOC ioctl to allocate a virtual event
queue (vEVENTQ) for a vIOMMU object.

Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Signed-off-by: Shameer Kolothum <skolothumtho@nvidia.com>
Message-id: 20260226084456.112142-2-skolothumtho@nvidia.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Nicolin Chen
2026-03-06 09:01:11 +00:00
committed by Peter Maydell
parent 005b1d838b
commit 0885cd5504
3 changed files with 46 additions and 0 deletions
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31
backends/iommufd.c
View File

@@ -504,6 +504,37 @@ bool iommufd_backend_alloc_vdev(IOMMUFDBackend *be, uint32_t dev_id,
return true;
}
bool iommufd_backend_alloc_veventq(IOMMUFDBackend *be, uint32_t viommu_id,
uint32_t type, uint32_t depth,
uint32_t *out_veventq_id,
uint32_t *out_veventq_fd, Error **errp)
{
int ret;
struct iommu_veventq_alloc alloc_veventq = {
.size = sizeof(alloc_veventq),
.flags = 0,
.type = type,
.veventq_depth = depth,
.viommu_id = viommu_id,
};
ret = ioctl(be->fd, IOMMU_VEVENTQ_ALLOC, &alloc_veventq);
trace_iommufd_viommu_alloc_eventq(be->fd, viommu_id, type,
alloc_veventq.out_veventq_id,
alloc_veventq.out_veventq_fd, ret);
if (ret) {
error_setg_errno(errp, errno, "IOMMU_VEVENTQ_ALLOC failed");
return false;
}
g_assert(out_veventq_id);
g_assert(out_veventq_fd);
*out_veventq_id = alloc_veventq.out_veventq_id;
*out_veventq_fd = alloc_veventq.out_veventq_fd;
return true;
}
bool host_iommu_device_iommufd_attach_hwpt(HostIOMMUDeviceIOMMUFD *idev,
uint32_t hwpt_id, Error **errp)
{

1
backends/trace-events
View File

@@ -23,6 +23,7 @@ iommufd_backend_get_dirty_bitmap(int iommufd, uint32_t hwpt_id, uint64_t iova, u
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)"
iommufd_viommu_alloc_eventq(int iommufd, uint32_t viommu_id, uint32_t type, uint32_t veventq_id, uint32_t veventq_fd, int ret) " iommufd=%d viommu_id=%u type=%u veventq_id=%u veventq_fd=%u (%d)"
# igvm-cfg.c
igvm_reset_enter(int type) "type=%u"

14
include/system/iommufd.h
View File

@@ -56,6 +56,15 @@ typedef struct IOMMUFDVdev {
uint32_t virt_id; /* virtual device ID */
} IOMMUFDVdev;
/* Virtual event queue interface for a vIOMMU */
typedef struct IOMMUFDVeventq {
IOMMUFDViommu *viommu;
uint32_t veventq_id;
uint32_t veventq_fd;
uint32_t last_event_seq; /* Sequence number of last processed event */
bool event_start; /* True after first valid event; cleared on overflow */
} IOMMUFDVeventq;
bool iommufd_backend_connect(IOMMUFDBackend *be, Error **errp);
void iommufd_backend_disconnect(IOMMUFDBackend *be);
@@ -86,6 +95,11 @@ 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_alloc_veventq(IOMMUFDBackend *be, uint32_t viommu_id,
uint32_t type, uint32_t depth,
uint32_t *out_veventq_id,
uint32_t *out_veventq_fd, 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,