Since DTE[Mode]=0 is prohibited on system, which enables SNP,
the passthrough domain (IOMMU_DOMAIN_IDENTITY) is not support.
Instead, only support IOMMU_DOMAIN_DMA[_FQ] domains.
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpa...@amd.com>
---
drivers/iommu/amd/iommu.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index ca4647f04382..ecde9e08102d 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -2379,6 +2379,17 @@ static int amd_iommu_def_domain_type(struct device *dev)
return 0;
}
+static bool amd_iommu_domain_type_supported(struct device *dev, int type)
+{
+ /*
+ * Since DTE[Mode]=0 is prohibited on SNP-enabled system,
+ * default to use IOMMU_DOMAIN_DMA[_FQ].
+ */
+ if (amd_iommu_snp_en && (type == IOMMU_DOMAIN_IDENTITY))
+ return false;
+ return true;
+}
+
struct iommu_ops amd_iommu_ops = {
.capable = amd_iommu_capable,
.domain_alloc = amd_iommu_domain_alloc,
@@ -2391,6 +2402,7 @@ struct iommu_ops amd_iommu_ops = {
.is_attach_deferred = amd_iommu_is_attach_deferred,
.pgsize_bitmap = AMD_IOMMU_PGSIZES,
.def_domain_type = amd_iommu_def_domain_type,
+ .domain_type_supported = amd_iommu_domain_type_supported,
.default_domain_ops = &(const struct iommu_domain_ops) {
.attach_dev = amd_iommu_attach_device,
.detach_dev = amd_iommu_detach_device,
--
2.32.0
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