Re: [Xen-devel] [PATCH v11.1 3/6] sysctl / libxl: report whether IOMMU/HAP page table sharing is supported

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

> From: Jan Beulich [mailto:jbeulich@xxxxxxxx]
> Sent: Friday, September 13, 2019 7:10 PM
> 
> This patch defines a new bit reported in the hw_cap field of struct
> xen_sysctl_physinfo to indicate whether the platform supports sharing of
> HAP page tables (i.e. the P2M) with the IOMMU. This informs the toolstack
> whether the domain needs extra memory to store discrete IOMMU page
> tables
> or not.
> 
> NOTE: This patch makes sure iommu_hap_pt_shared is clear if HAP is not
>       supported or the IOMMU is disabled, and defines it to false if
>       !CONFIG_HVM.
> 
> Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> Acked-by: Christian Lindig <christian.lindig@xxxxxxxxxx>

Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
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