On 27.02.2025 21:38, Andrew Cooper wrote: > I've raised this during review before, but: > >> (XEN) [ 1.209230] AMD-Vi: IOMMU Extended Features: >> (XEN) [ 1.213998] - Peripheral Page Service Request >> (XEN) [ 1.218849] - x2APIC >> (XEN) [ 1.221536] - NX bit >> (XEN) [ 1.224221] - Invalidate All Command >> (XEN) [ 1.228297] - Guest APIC >> (XEN) [ 1.236062] - Performance Counters >> (XEN) [ 1.244692] - Host Address Translation Size: 0x2 >> (XEN) [ 1.254547] - Guest Address Translation Size: 0 >> (XEN) [ 1.264313] - Guest CR3 Root Table Level: 0x1 >> (XEN) [ 1.273925] - Maximum PASID: 0xf >> (XEN) [ 1.282338] - SMI Filter Register: 0x1 >> (XEN) [ 1.291241] - SMI Filter Register Count: 0x2 >> (XEN) [ 1.300607] - Guest Virtual APIC Modes: 0 >> (XEN) [ 1.309655] - Dual PPR Log: 0x2 >> (XEN) [ 1.317801] - Dual Event Log: 0x2 >> (XEN) [ 1.326078] - Secure ATS >> (XEN) [ 1.333490] - User / Supervisor Page Protection >> (XEN) [ 1.342892] - Device Table Segmentation: 0x3 >> (XEN) [ 1.351981] - PPR Log Overflow Early Warning >> (XEN) [ 1.361040] - PPR Automatic Response >> (XEN) [ 1.369341] - Memory Access Routing and Control: 0x1 >> (XEN) [ 1.379012] - Block StopMark Message >> (XEN) [ 1.387273] - Performance Optimization >> (XEN) [ 1.395637] - MSI Capability MMIO Access >> (XEN) [ 1.404138] - Guest I/O Protection >> (XEN) [ 1.412042] - Host Access >> (XEN) [ 1.419105] - Enhanced PPR Handling >> (XEN) [ 1.427008] - Attribute Forward >> (XEN) [ 1.434494] - Host Dirty >> (XEN) [ 1.441308] - Virtualized IOMMU >> (XEN) [ 1.448699] - VMGuard I/O Support >> (XEN) [ 1.456345] - VM Table Size: 0x2 >> (XEN) [ 1.491312] AMD-Vi: IOMMU 0 Enabled. >> (XEN) [ 1.499087] AMD-Vi: IOMMU 1 Enabled. >> (XEN) [ 1.506835] AMD-Vi: IOMMU 2 Enabled. >> (XEN) [ 1.514554] AMD-Vi: IOMMU 3 Enabled. >> (XEN) [ 1.522452] I/O virtualisation enabled > > Lots of that information is not actually useful, not even for > developers.
"Lots" != "all" (or maybe you meant all without saying so). Then what we'd need are criteria by which to judge what to log and and what to omit from logging. > What's worse is that this is a release build of Xen and it > still takes 0.3s to print the feature list alone. With a serial console, I expect? Or with us still wrongly using UC accesses to VGA memory? Jan
