iommu/amd: Do not allocate io_pgtable_ops for passthrough domain

In passthrough mode we do not use IOMMU page table. Hence we don't need
to allocate io_pgtable_ops.

Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Link: https://lore.kernel.org/r/20230105091728.42469-1-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index cbeaab55c0dbccb3e3c4e0ad86839f6cd52a137d..b7c1eac1dfa512b0c31fa43bad7ca20e8c582aa1 100644 (file)
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -2072,6 +2072,10 @@ static struct protection_domain *protection_domain_alloc(unsigned int type)
        if (ret)
                goto out_err;
 
+       /* No need to allocate io pgtable ops in passthrough mode */
+       if (type == IOMMU_DOMAIN_IDENTITY)
+               return domain;
+
        pgtbl_ops = alloc_io_pgtable_ops(pgtable, &domain->iop.pgtbl_cfg, domain);
        if (!pgtbl_ops) {
                domain_id_free(domain->id);