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

[David Woodhouse]

From: David Woodhouse <d...@amazon.co.uk>

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 <d...@amazon.co.uk>
---
 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