This patch adds a pair of callbacks of iommu_set_nesting_vmid() and
iommu_get_nesting_vmid() to exchange VMID with the IOMMU core (then
an IOMMU driver).
As a VMID is generated in an IOMMU driver, which is called from the
vfio_iommu_attach_group() function call, add iommu_get_nesting_vmid
right after it creates a VMID and add iommu_set_nesting_vmid before
it to let IOMMU driver reuse it.
Signed-off-by: Nicolin Chen <nicolinc@xxxxxxxxxx>
---
drivers/vfio/vfio_iommu_type1.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index bb5d949bc1af..9e72d74dedcd 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -2322,12 +2322,24 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
ret = iommu_enable_nesting(domain->domain);
if (ret)
goto out_domain;
+
+ if (iommu->vmid != VFIO_IOMMU_VMID_INVALID) {
+ ret = iommu_set_nesting_vmid(domain->domain, iommu->vmid);
+ if (ret)
+ goto out_domain;
+ }
}
ret = vfio_iommu_attach_group(domain, group);
if (ret)
goto out_domain;
+ if (iommu->nesting && iommu->vmid == VFIO_IOMMU_VMID_INVALID) {
+ ret = iommu_get_nesting_vmid(domain->domain, &iommu->vmid);
+ if (ret)
+ goto out_domain;
+ }
+
/* Get aperture info */
geo = &domain->domain->geometry;
if (vfio_iommu_aper_conflict(iommu, geo->aperture_start,
--
2.17.1
