Re: [Xen-devel] [PATCH v2] iommu: leave IOMMU enabled by default during kexec crash transition

[Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>]

On 22/02/2019 12:34, Jan Beulich wrote:
>>>> On 21.02.19 at 23:08, <igor.druzhinin@xxxxxxxxxx> wrote:
>> Modern Linux kernels taught to copy all the necessary DMAR/IR tables
>> following kexec from the previous kernel (Xen in our case) - so it's
>> currently normal to keep IOMMU enabled. It might require minor changes to
>> kdump command line that enables IOMMU drivers (e.g. intel_iommu=on /
>> intremap=on) but recent kernels don't require any additional changes for
>> the transition to be transparent.
> 
> In your reply on the v1 thread didn't you say Linux disables translation?

I didn't rule out a possibility that there were versions of Linux that
did it in a wrong order or didn't do it at all as current versions do.

Igor

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