Re: pv-grub boot hangs when iommu=soft. Booting kernel directly with the flags works

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Konrad previously stated:

"If the 'iommu=soft swiotlb=force' is removed it boots"

but in actuality,  "switotlb=force" can be left in and it boots ok as well.  From what I've see it is only when having "iommu=soft" added in that exposes the issue.  The original post provides a failing example and a working example, so I'm not sure what further examples I can provide.   I understand that you have communicated that you don't have time for this in near future and I respect that, however, if there is something specific to try that would shed more light on the issue then let me know.

Richie


Samuel Thibault wrote:
> Konrad Rzeszutek Wilk, le Wed 07 Apr 2010 12:24:16 -0400, a écrit :
>   
>> On Tue, Apr 06, 2010 at 02:25:07AM +0200, Samuel Thibault wrote:
>>     
>>> (Note: I don't know at all about what iommu=soft does, so for now I'm
>>>       
>> The iommu=soft enables in the kernel the Software IOMMU. This is
>> required for PCI passthrough devices. But the problem isn't with those
>> flags (I've asked the user to extract the kernel and initrd and use
>> those exact parameters and just do a PV boot - and it worked).
>>
>> The problem is that MiniOS is doing something wrongly..
>>     
>
> In combination with those flags.
>
>   
>> I don't know if the problem is with arguments
>>     
>
> I doubt this as I do already pass arguments to my kernels fine.
>
>   
>> or if the underlaying storage is the issue (tap:aio) with MiniOS.
>>     
>
> The user should try the simplest way (i.e. the provided pv-grub
> configuration examples), and then from there, check which flags makes
> things not work.
>
> Samuel
>
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