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



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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