Hi,
On 3/11/25 3:10 PM, Shameer Kolothum wrote:
> From: Nicolin Chen <nicol...@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
s/sid/SID
> invalidations).
>
> Signed-off-by: Nicolin Chen <nicol...@nvidia.com>
> Signed-off-by: Shameer Kolothum <shameerali.kolothum.th...@huawei.com>
> ---
> hw/arm/smmuv3-accel.c | 22 ++++++++++++++++++++++
> include/hw/arm/smmuv3-accel.h | 6 ++++++
> 2 files changed, 28 insertions(+)
>
> 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);
nit: no need to use 0 variant if you set all fields
> + 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;
>
