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Verbosity during boot
- To: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 27 Feb 2025 20:38:27 +0000
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- Cc: Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Thu, 27 Feb 2025 20:38:46 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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. What's worse is that this is a release build of Xen and it
still takes 0.3s to print the feature list alone.
~Andrew
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