Re: [Xen-devel] [PATCH v6 6/6] x86/iommu: add map-reserved dom0-iommu option to map reserved memory ranges

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Roger Pau Monne [mailto:roger.pau@xxxxxxxxxx]
> Sent: Tuesday, August 21, 2018 3:50 PM
> 
> 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 a PVH Dom0 (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>
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