Re: [Xen-devel] win7 stuck on boot occasionally when apicv enabled

["Zhang, Yang Z" <yang.z.zhang@xxxxxxxxx>]

Sunguodong wrote on 2015-06-03:
> Hi,
> 
> I am getting a vm stuck problem when booting a windows 7 guest on 
> xen-4.6(latest version).
> 
> My hvm guest: Windows 7 64bit (installed pvdriver inside, pvdriver is 
> downloaded from 
> 'http://wiki.univention.de/index.php?title=Installing-signed-GPLPV-dri
> vers')
> 
> My server's CPU model name : Intel(R) Xeon(R) CPU E5-2643 v2 @ 3.50GHz
> 
> 
> 
> This happens rarely, maybe only once in hundreds times of rebooting, 
> and when this appens, it stucks on the Windows Logo screen.
> 
> In order to know where it stopped, I turned on the Boot message and OS 
> Boot Information in OS. It showed something like bellow:
> 
> "
> 
> Micfosoft (R) Windows (R) Version 6.1 (Build 7600)
> 
> 4 System Processors [4088 MB Memory] MultiProcessor Kernel
> 
> Boot Logging Enabled
> 
> "
> 
> then it stucks forever.
> 
> 
> 
> Then I turned off apicv with option 'apicv=0' and did the rebooting 
> test again, the stuck problem didn't show up for at least 9000 times of 
> rebooting.
> 
> So I think it is related with apicv, maybe interrupts loss 
> occasionally when vm is booting when apicv is enabled.
> 
> 
> 
> Has anyone come across this problem before? Or what can I do to solve this?

Can you try to use 'xl destroy && xl create' instead of reboot? I suspect there 
may be some status in VCPU doesn't be reset correctly during reboot.

btw, I guess you didn't enable the viridian in guest config? It's better to 
turn off it to help to narrow down the issue.

> 
> 
> 
> Thank you.
> 
>


Best regards,
Yang



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