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

  • To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Connor Davis <connojd@xxxxx>
  • Date: Wed, 25 Jul 2018 16:10:59 -0400
  • Delivery-date: Wed, 25 Jul 2018 20:11:33 +0000
  • Feedback-id: 68WFOZSuOGPZLaxryX9Ek1qg6R0zuaiLhz_2G4BbZV1EcLAf3mQTftAwCboh1maFQl7tol5YMEks3nc7rBQ4UA==:Ext:ProtonMail
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

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

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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