Re: [Xen-devel] [PATCH] amd iommu: Dump flags of IO page faults

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

Friday, September 7, 2012, 11:53:36 AM, you wrote:

>>>> On 07.09.12 at 09:32, Sander Eikelenboom <linux@xxxxxxxxxxxxxx> wrote:
>> 4.1:    Capabilities: [54] MSI: Enable- Count=1/1 Maskable- 64bit+
>> 4.2:    Capabilities: [54] MSI: Enable+ Count=1/1 Maskable- 64bit+

> No surprise you're not seeing any faults on 4.1 - there's no way
> they could get reported. I'm somewhat hesitant to pull the
> workaround patch from 4.2 into 4.1, as it's wrong for the kernel
> to touch the MSI setting of the IOMMU (which is under the
> control of Xen) in the first place, but the kernel side patch I had
> submitted a while ago wasn't received well. And that patch isn't
> really small, and it would remain to be seen what other
> dependencies it would have...

Ok so that would mean that in the 4.1 case, the IOMMU is doing nothing ?

Because if the IOMMU is working, i  would say:
           a) isn't it a bit strange that everything keeps working, although it 
should report the IO PAGE FAULT ?
           b) is the IO PAGE FAULT correct anyway, since the device keeps 
working fine ?


> Jan




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