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iommu/amd: Don't register interrupt remapping irqdomain when IR is disabled 

Registering the remapping irq domain unconditionally is potentially
allowing I/O-APIC and MSI interrupts to be parented in the IOMMU IR domain
even when IR is disabled. Don't do that.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20201111144322.1659970-1-dwmw2@infradead.org
This commit is contained in:
David Woodhouse 2020-11-11 14:43:20 +00:00 committed by Thomas Gleixner
parent 2fb6acf3ed
commit 2df985f5e4
1 changed files with 5 additions and 3 deletions
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8
drivers/iommu/amd/init.c
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@ -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