Re: [Xen-devel] [PATCH v5 2/8] iommu: introduce dom0-iommu option

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 14.08.18 at 15:43, <roger.pau@xxxxxxxxxx> wrote:
> --- a/docs/misc/xen-command-line.markdown
> +++ b/docs/misc/xen-command-line.markdown
> @@ -681,6 +681,19 @@ Flag that makes a dom0 boot in PVHv2 mode.
>  Flag that makes a dom0 use shadow paging. Only works when "pvh" is
>  enabled.
>  
> +### dom0-iommu
> +> `= List of [ passthrough | strict ]`
> +
> +This list of booleans control the iommu usage by Dom0:

... controls ...

> +* `passthrough`: disables DMA remapping for Dom0. Default is `false`.

Mind also stating that this must not be enabled for PVH Dom0? Or
perhaps ...

> +* `strict`: sets up DMA remapping only for the RAM Dom0 actually got 
> assigned.
> +  Default is `false` which means Dom0 will get mappings for all the host
> +  RAM except regions in use by Xen. Note that this option is hard coded to
> +  `true` for a PVH Dom0 and any attempt to overwrite it from the command line
> +  is ignored.

... it could be made act like this, ignoring the request instead of
panic()ing?

Jan



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