[Xen-devel] [BUG] Serial port prevents PVH dom0 boot

[Connor Davis <connojd@xxxxx>]

When booting into dom0=pvh, using the serial console prevents
dom0 from booting. Serial works until Xen tries to hand off to dom0.
The specific crash varies with the arguments passed to iommu:

iommu=1,debug console=com1 com1=115200,8n1
Xen goes into an infinite loop

iommu=1 console=com1 com1=115200,8n1
Xen either receives an NMI in process_pending_softirqs or gets
stuck in __sync_local_execstate

iommu=1
dom0 boots fine, but USB doesn't work (as others have recently
posted about). I'm using xen staging and linux xen/tip.
Example logs for the first two cases are attached.

Connor Davis

Attachment: xen-iommu-nodebug-sync.txt
Description: Text document

Attachment: xen-iommu-debug.txt
Description: Text document

Attachment: xen-iommu-nodebug.txt
Description: Text document

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