[PATCH 1/3] iommu/amd: Don't register interrupt remapping irqdomain when IR is disabled

[David Woodhouse]

From: David Woodhouse <dwmw@xxxxxxxxxxxx>

This was potentially allowing I/OAPIC and MSI interrupts to be parented
in the IOMMU IR domain even when IR was disabled. Don't do that.

Signed-off-by: David Woodhouse <dwmw@xxxxxxxxxxxx>
---
 drivers/iommu/amd/init.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index 263670d36fed..90a8add186e0 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -1601,9 +1601,11 @@ static int __init init_iommu_one(struct amd_iommu *iommu, struct ivhd_header *h)
 	if (ret)
 		return ret;
 
-	ret = amd_iommu_create_irq_domain(iommu);
-	if (ret)
-		return ret;
+	if (amd_iommu_irq_remap) {
+		ret = amd_iommu_create_irq_domain(iommu);
+		if (ret)
+			return ret;
+	}
 
 	/*
 	 * Make sure IOMMU is not considered to translate itself. The IVRS
-- 
2.26.2