Re: [Xen-devel] Network blocked after sending several packets larger than 128 bytes when using Driver Domain

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

openlui wrote on 2015-03-28:
> Hi, all:
>     I have done the same testing on hosts which support "Intel VT-d 
> Shared EPT tables" today, the results show that similar problem still 
> exists under xen
> 4.5 release:
>    1. When we boot xen with "iommu=1, no-sharept" argument which will 
> disable "Intel VT-d Shared EPT tables", the problem doesn't exist any 
> more. As shown in my last mail, I have found it is the commit
> 203746bc36b41443d0eec78819f153fb59bc68d1 fix it.
>    2. Without above boot arguments, "Intel VT-d Shared EPT tables"
> will be enabled. And the network between driver domains will be 
> blocked after sending several packets from domu. However, which is 
> different from the last mail is that there are not any exception logs in 
> driver domain.
>    I think maybe it is a bug for xen 4.5 + pci passthrough, could 
> anybody give me some advice about how to debug and solve it? Thanks.

It seems something wrong with VT-d page table to map grant page. Please try to 
add iommu=debug to get more information.

> 
> 
> 
>


Best regards,
Yang



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