[PATCH v3 14/14] iommu/vt-d: Store guest PASID during bind

Jacob Pan
2020-09-28T21:37:17Z

IOASID core maintains the guest-host mapping in the form of SPID and
IOASID. This patch assigns the guest PASID (if valid) as SPID while
binding guest page table with a host PASID. This mapping will be used
for lookup and notifications.

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
---
drivers/iommu/intel/svm.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index 8f886718df83..e18f8b5af9ba 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -98,6 +98,7 @@ static inline bool intel_svm_capable(struct intel_iommu *iommu)
static inline void intel_svm_drop_pasid(ioasid_t pasid)
{
ioasid_detach_data(pasid);
+ ioasid_detach_spid(pasid);
ioasid_put(NULL, pasid);
}

@@ -425,6 +426,7 @@ int intel_svm_bind_gpasid(struct iommu_domain *domain, struct device *dev,
if (data->flags & IOMMU_SVA_GPASID_VAL) {
svm->gpasid = data->gpasid;
svm->flags |= SVM_FLAG_GUEST_PASID;
+ ioasid_attach_spid(data->hpasid, data->gpasid);
}
ioasid_attach_data(data->hpasid, svm);
ioasid_get(NULL, svm->pasid);
--
2.7.4