iommu: Disable passthrough mode when SME is active
Using Passthrough mode when SME is active causes certain devices to use the SWIOTLB bounce buffer. The bounce buffer code has an upper limit of 256kb for the size of DMA allocations, which is too small for certain devices and causes them to fail. With this patch we enable IOMMU by default when SME is active in the system, making the default configuration work for more systems than it does now. Users that don't want IOMMUs to be enabled still can disable them with kernel parameters. Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com> Tested-by: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
parent
22bb182c83
commit
2cc13bb4f5
|
@ -119,6 +119,11 @@ static int __init iommu_subsys_init(void)
|
|||
iommu_set_default_passthrough(false);
|
||||
else
|
||||
iommu_set_default_translated(false);
|
||||
|
||||
if (iommu_default_passthrough() && sme_active()) {
|
||||
pr_info("SME detected - Disabling default IOMMU Passthrough\n");
|
||||
iommu_set_default_translated(false);
|
||||
}
|
||||
}
|
||||
|
||||
pr_info("Default domain type: %s %s\n",
|
||||
|
|
Loading…
Reference in a new issue