Re: [Xen-devel] [PATCH v4 1/4] docs: Introduce xenstore paths for PV control features

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Paul Durrant writes ("[PATCH v4 1/4] docs: Introduce xenstore paths for PV 
control features"):
> XenServer already makes use of ~/control/feature-suspend being written
> to advertise guest capability of responding to 'suspend' when written to
> ~/control/shutdown and, since they are derived from XenServer drivers,
> the Xen Project Windows PV drivers attempt to write this value. The write
> currently fails for libxl provisioned VMs because ~/control is read-only
> to the guest (only ~/control/shutdown is writable, for ackowledgement
> purposes).
> 
> This patch documents feature-suspend and also a set of similar control
> feature flags, so that that they may be added to libxl provisioned
> guests by subsequent patches:
> 
> feature-poweroff: PV drivers/agent can shut down the guest
> feature-reboot: PV drivers/agent can reboot the guest
> feature-s3: PV drivers/agent can trigger guest sleep (HVM only)
> feature-s4: PV drivers/agent can trigger guest hibernate (HVM only)
> 
> The patch (bacause it adds features relating to S3 and S4 power states)
> also clarifies that the initial set of platform properties mentioned are
> booleans, and updates the specifier accordingly.

Thanks for the good clear text in the spec.

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

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