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backends/iommufd: Add get_pasid_info() callback

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The get_pasid_info callback retrieves PASID capability information
when the HostIOMMUDevice backend supports it. Currently, only the
Linux IOMMUFD backend provides this information.

This will be used by a subsequent patch to synthesize a PASID
capability for vfio-pci devices behind a vIOMMU that supports PASID.

Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Tested-by: Eric Auger <eric.auger@redhat.com>
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Shameer Kolothum <skolothumtho@nvidia.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>
Message-id: 20260126104342.253965-34-skolothumtho@nvidia.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Shameer Kolothum
2026-01-29 13:32:05 +00:00
committed by Peter Maydell
parent 550beca3d7
commit 22afd9d865
2 changed files with 34 additions and 0 deletions
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17
backends/iommufd.c
View File

@@ -539,11 +539,28 @@ static int hiod_iommufd_get_cap(HostIOMMUDevice *hiod, int cap, Error **errp)
}
}
static bool hiod_iommufd_get_pasid_info(HostIOMMUDevice *hiod,
PasidInfo *pasid_info)
{
HostIOMMUDeviceCaps *caps = &hiod->caps;
if (!caps->max_pasid_log2) {
return false;
}
g_assert(pasid_info);
pasid_info->exec_perm = (caps->hw_caps & IOMMU_HW_CAP_PCI_PASID_EXEC);
pasid_info->priv_mod = (caps->hw_caps & IOMMU_HW_CAP_PCI_PASID_PRIV);
pasid_info->max_pasid_log2 = caps->max_pasid_log2;
return true;
}
static void hiod_iommufd_class_init(ObjectClass *oc, const void *data)
{
HostIOMMUDeviceClass *hioc = HOST_IOMMU_DEVICE_CLASS(oc);
hioc->get_cap = hiod_iommufd_get_cap;
hioc->get_pasid_info = hiod_iommufd_get_pasid_info;
};
static const TypeInfo types[] = {

17
include/system/host_iommu_device.h
View File

@@ -59,6 +59,12 @@ struct HostIOMMUDevice {
#endif
};
typedef struct PasidInfo {
bool exec_perm;
bool priv_mod;
uint8_t max_pasid_log2;
} PasidInfo;
/**
* struct HostIOMMUDeviceClass - The base class for all host IOMMU devices.
*
@@ -116,6 +122,17 @@ struct HostIOMMUDeviceClass {
* @hiod: handle to the host IOMMU device
*/
uint64_t (*get_page_size_mask)(HostIOMMUDevice *hiod);
/**
* @get_pasid_info: Return the PASID information associated with the
* @hiod Host IOMMU device.
*
* @hiod: handle to the host IOMMU device
*
* @pasid_info: If success, returns the PASID related information.
*
* Returns: true on success, false on failure.
*/
bool (*get_pasid_info)(HostIOMMUDevice *hiod, PasidInfo *pasid_info);
};
/*