diff mbox series

[RFC,v2,11/20] hw/arm/smmuv3-accel: Allocate a vDEVICE object for device

Message ID 20250311141045.66620-12-shameerali.kolothum.thodi@huawei.com (mailing list archive)
State New
Headers show
Series hw/arm/virt: Add support for user-creatable accelerated SMMUv3 | expand

Commit Message

Shameer Kolothum March 11, 2025, 2:10 p.m. UTC 
From: Nicolin Chen <nicolinc@nvidia.com>

Allocate and associate a vDEVICE object for the Guest device
with the vIOMMU. This will help the kernel to do the
vSID --> sid translation whenever required (eg: device specific
invalidations).

Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
---
 hw/arm/smmuv3-accel.c         | 22 ++++++++++++++++++++++
 include/hw/arm/smmuv3-accel.h |  6 ++++++
 2 files changed, 28 insertions(+)
diff mbox series

Patch

diff --git a/hw/arm/smmuv3-accel.c b/hw/arm/smmuv3-accel.c
index d3a5cf9551..056bd23b2e 100644
--- a/hw/arm/smmuv3-accel.c
+++ b/hw/arm/smmuv3-accel.c
@@ -109,6 +109,20 @@  void smmuv3_accel_install_nested_ste(SMMUDevice *sdev, int sid)
         return;
     }
 
+    if (!accel_dev->vdev && accel_dev->idev) {
+        SMMUVdev *vdev;
+        uint32_t vdev_id;
+        SMMUViommu *viommu = accel_dev->viommu;
+
+        iommufd_backend_alloc_vdev(viommu->core.iommufd, accel_dev->idev->devid,
+                                   viommu->core.viommu_id, sid, &vdev_id,
+                                   &error_abort);
+        vdev = g_new0(SMMUVdev, 1);
+        vdev->vdev_id = vdev_id;
+        vdev->sid = sid;
+        accel_dev->vdev = vdev;
+    }
+
     ret = smmu_find_ste(sdev->smmu, sid, &ste, &event);
     if (ret) {
         /*
@@ -283,6 +297,7 @@  static bool smmuv3_accel_set_iommu_device(PCIBus *bus, void *opaque, int devfn,
 static void smmuv3_accel_unset_iommu_device(PCIBus *bus, void *opaque,
                                             int devfn)
 {
+    SMMUVdev *vdev;
     SMMUDevice *sdev;
     SMMUv3AccelDevice *accel_dev;
     SMMUViommu *viommu;
@@ -312,6 +327,13 @@  static void smmuv3_accel_unset_iommu_device(PCIBus *bus, void *opaque,
     trace_smmuv3_accel_unset_iommu_device(devfn, smmu_get_sid(sdev));
 
     viommu = s_accel->viommu;
+    vdev = accel_dev->vdev;
+    if (vdev) {
+        iommufd_backend_free_id(viommu->iommufd, vdev->vdev_id);
+        g_free(vdev);
+        accel_dev->vdev = NULL;
+    }
+
     if (QLIST_EMPTY(&viommu->device_list)) {
         iommufd_backend_free_id(viommu->iommufd, viommu->bypass_hwpt_id);
         iommufd_backend_free_id(viommu->iommufd, viommu->abort_hwpt_id);
diff --git a/include/hw/arm/smmuv3-accel.h b/include/hw/arm/smmuv3-accel.h
index d6b0b1ca30..54b217ab4f 100644
--- a/include/hw/arm/smmuv3-accel.h
+++ b/include/hw/arm/smmuv3-accel.h
@@ -35,6 +35,11 @@  typedef struct SMMUViommu {
     QLIST_ENTRY(SMMUViommu) next;
 } SMMUViommu;
 
+typedef struct SMMUVdev {
+    uint32_t vdev_id;
+    uint32_t sid;
+} SMMUVdev;
+
 typedef struct SMMUS1Hwpt {
     IOMMUFDBackend *iommufd;
     uint32_t hwpt_id;
@@ -45,6 +50,7 @@  typedef struct SMMUv3AccelDevice {
     HostIOMMUDeviceIOMMUFD *idev;
     SMMUS1Hwpt  *s1_hwpt;
     SMMUViommu *viommu;
+    SMMUVdev   *vdev;
     QLIST_ENTRY(SMMUv3AccelDevice) next;
 } SMMUv3AccelDevice;