backends/iommufd: Introduce iommufd_backend_alloc_hw_queue
Add a helper to allocate an iommufd backed HW queue for a vIOMMU. While at it, define a struct IOMMUFDHWqueue for use by vendor implementations. Signed-off-by: Nicolin Chen <nicolinc@nvidia.com> Reviewed-by: Eric Auger <eric.auger@redhat.com> Tested-by: Nicolin Chen <nicolinc@nvidia.com> Signed-off-by: Shameer Kolothum <skolothumtho@nvidia.com> Tested-by: Eric Auger <eric.auger@redhat.com> Message-id: 20260609112552.378999-4-skolothumtho@nvidia.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Nicolin Chen committed
Jun 9, 2026 at 12:25 UTC
41dae463f487a5d94822a069043b7675405d0365
3 files changed
+43
backends/iommufd.c
+31
@@ -549,6 +549,37 @@ bool iommufd_backend_alloc_veventq(IOMMUFDBackend *be, uint32_t viommu_id,
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return true;
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}
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+bool iommufd_backend_alloc_hw_queue(IOMMUFDBackend *be, uint32_t viommu_id,
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+ uint32_t queue_type, uint32_t index,
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+ uint64_t addr, uint64_t length,
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+ uint32_t *out_hw_queue_id, Error **errp)
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+{
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+ int ret;
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+ struct iommu_hw_queue_alloc alloc_hw_queue = {
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+ .size = sizeof(alloc_hw_queue),
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+ .flags = 0,
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+ .viommu_id = viommu_id,
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+ .type = queue_type,
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+ .index = index,
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+ .nesting_parent_iova = addr,
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+ .length = length,
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+ };
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+
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+ ret = ioctl(be->fd, IOMMU_HW_QUEUE_ALLOC, &alloc_hw_queue);
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+
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+ trace_iommufd_backend_alloc_hw_queue(be->fd, viommu_id, queue_type,
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+ index, addr, length,
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+ alloc_hw_queue.out_hw_queue_id, ret);
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+ if (ret) {
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+ error_setg_errno(errp, errno, "IOMMU_HW_QUEUE_ALLOC failed");
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+ return false;
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+ }
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+
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+ g_assert(out_hw_queue_id);
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+ *out_hw_queue_id = alloc_hw_queue.out_hw_queue_id;
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+ return true;
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+}
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+
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bool host_iommu_device_iommufd_attach_hwpt(HostIOMMUDeviceIOMMUFD *hiodi,
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uint32_t hwpt_id, Error **errp)
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{
backends/trace-events
+1
@@ -24,6 +24,7 @@ iommufd_backend_invalidate_cache(int iommufd, uint32_t id, uint32_t data_type, u
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iommufd_backend_alloc_viommu(int iommufd, uint32_t dev_id, uint32_t type, uint32_t hwpt_id, uint64_t data_ptr, uint32_t data_len, uint32_t viommu_id, int ret) " iommufd=%d type=%u dev_id=%u hwpt_id=%u data_ptr=0x%"PRIx64" data_len=0x%x viommu_id=%u (%d)"
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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)"
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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)"
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+iommufd_backend_alloc_hw_queue(int iommufd, uint32_t viommu_id, uint32_t queue_type, uint32_t index, uint64_t addr, uint64_t size, uint32_t queue_id, int ret) " iommufd=%d viommu_id=%u queue_type=%u index=%u addr=0x%"PRIx64" size=0x%"PRIx64" queue_id=%u (%d)"
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# igvm-cfg.c
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igvm_reset_enter(int type) "type=%u"
include/system/iommufd.h
+11
@@ -65,6 +65,12 @@ typedef struct IOMMUFDVeventq {
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bool event_start; /* True after first valid event; cleared on overflow */
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} IOMMUFDVeventq;
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+/* HW queue object for a vIOMMU-specific HW-accelerated queue */
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+typedef struct IOMMUFDHWqueue {
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+ IOMMUFDViommu *viommu;
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+ uint32_t hw_queue_id;
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+} IOMMUFDHWqueue;
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+
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bool iommufd_backend_connect(IOMMUFDBackend *be, Error **errp);
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void iommufd_backend_disconnect(IOMMUFDBackend *be);
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@@ -101,6 +107,11 @@ bool iommufd_backend_alloc_veventq(IOMMUFDBackend *be, uint32_t viommu_id,
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uint32_t *out_veventq_id,
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uint32_t *out_veventq_fd, Error **errp);
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+bool iommufd_backend_alloc_hw_queue(IOMMUFDBackend *be, uint32_t viommu_id,
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+ uint32_t queue_type, uint32_t index,
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+ uint64_t addr, uint64_t length,
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+ uint32_t *out_hw_queue_id, Error **errp);
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+
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bool iommufd_backend_set_dirty_tracking(IOMMUFDBackend *be, uint32_t hwpt_id,
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bool start, Error **errp);
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bool iommufd_backend_get_dirty_bitmap(IOMMUFDBackend *be, uint32_t hwpt_id,