On 2/18/22 4:21 PM, Huang Adrian wrote:
Another thing I am still concerned is about the context entry setup. What does the context entries look like for both VMD and subdevices after domain_context_mapping() being called?pasid_table in struct device_domain_info is NULL because the field pasid_table is configured in intel_pasid_alloc_table(). The following statement in domain_context_mapping_one() is true for subdevices because the context is configured by the real VMD device 0000:59:00.5. So, domain_context_mapping() does nothing for subdevices. if (context_present(context)) goto out_unlock; Here is the log for your reference with pr_debug() enabled. [ 19.063445] pci 0000:59:00.5: Adding to iommu group 42 ... [ 22.673502] DMAR: Set context mapping for 59:00.5 .. [ 32.089696] vmd 0000:59:00.5: PCI host bridge to bus 10000:80 [ 32.119452] pci 10000:80:01.0: [8086:352a] type 01 class 0x060400 [ 32.126302] pci 10000:80:01.0: reg 0x10: [mem 0x00000000-0x0001ffff 64bit] [ 32.134023] pci 10000:80:01.0: enabling Extended Tags [ 32.139730] pci 10000:80:01.0: PME# supported from D0 D3hot D3cold [ 32.160526] DMAR: Set context mapping for 59:00.5 [ 32.171090] pci 10000:80:01.0: Adding to iommu group 42 ...
That's clear to me now. Thank you very much! Best regards, baolu
