Re: [Xen-devel] [PATCH v8 6/6] x86/iommu: add map-reserved dom0-iommu option to map reserved memory ranges

[Julien Grall <julien.grall@xxxxxxx>]

Hi Roger,

On 07/09/18 10:07, Roger Pau Monne wrote:
> Several people have reported hardware issues (malfunctioning USB
> controllers) due to iommu page faults on Intel hardware. Those faults
> are caused by missing RMRR (VTd) entries in the ACPI tables. Those can
> be worked around on VTd hardware by manually adding RMRR entries on
> the command line, this is however limited to Intel hardware and quite
> cumbersome to do.
>
> In order to solve those issues add a new dom0-iommu=map-reserved
> option that identity maps all regions marked as reserved in the memory
> map. Note that regions used by devices emulated by Xen (LAPIC, IO-APIC
> or PCIe MCFG regions) are specifically avoided. Note that this option
> is available to all Dom0 modes (as opposed to the inclusive option
> which only works for PV Dom0).
>
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
> Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
> Reviewed-by: Wei Liu <wei.liu2@xxxxxxxxxx>
> Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
For Arm bits:

Acked-by: Julien Grall <julien.grall@xxxxxxx>

Cheers,

--
Julien Grall

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