On 26/11/2019 08:42, Jan Beulich wrote:
> On 25.11.2019 22:05, Igor Druzhinin wrote:
>> --- a/xen/drivers/passthrough/amd/iommu_init.c
>> +++ b/xen/drivers/passthrough/amd/iommu_init.c
>> @@ -1279,7 +1279,7 @@ static int __init amd_iommu_setup_device_table(
>> for ( bdf = 0, size /= sizeof(*dt); bdf < size; ++bdf )
>> dt[bdf] = (struct amd_iommu_dte){
>> .v = true,
>> - .iv = true,
>> + .iv = iommu_intremap,
> This was very intentionally "true", and ignoring "iommu_intremap":
Deliberate or not, it is a regression from 4.12.
Booting with iommu=no-intremap is a common debugging technique, and that
means no interrupt remapping anywhere in the system, even for
supposedly-unused DTEs.
~Andrew
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