Re: [Xen-devel] [PATCH v3 2/2] sysctl/libxl: choose a sane default for HAP

[Ian Jackson <ian.jackson@xxxxxxxxxx>]

Roger Pau Monne writes ("[PATCH v3 2/2] sysctl/libxl: choose a sane default for 
HAP"):
> Current libxl code will always enable Hardware Assisted Paging (HAP),
> expecting that the hypervisor will fallback to shadow if HAP is not
> available. With the changes to the domain builder that's not the case
> any longer, and the hypervisor will raise an error if HAP is not
> available instead of silently falling back to shadow.
> 
> In order to keep the previous functionality report whether HAP is
> available or not in XEN_SYSCTL_physinfo, so that the toolstack can
> select a sane default if there's no explicit user selection of whether
> HAP should be used.
> 
> Note that on ARM hardware HAP capability is always reported since it's
> a required feature in order to run Xen.
> 
> Fixes: d0c0ba7d3de ('x86/hvm/domain: remove the 'hap_enabled' flag')
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
> Reviewed-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
> Acked-by: Jan Beulich <jbeulich@xxxxxxxx>

Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>

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