Re: [Xen-devel] [PATCH v2 3/8] viridian: extend init/deinit hooks into synic and time modules

["Jan Beulich" <jbeulich@xxxxxxxx>]

>>> Paul Durrant <paul.durrant@xxxxxxxxxx> 01/08/19 4:18 PM >>>
>This patch simply adds domain and vcpu init/deinit hooks into the synic
>and time modules and wires them into viridian_[domain|vcpu]_[init|deinit]().
>Only one of the hooks is currently needed (to unmap the 'VP Assist' page)
>but subsequent patches will make use of the others.
>
>NOTE: To perform the unmap of the VP Assist page,
>viridian_unmap_guest_page() is now directly called in the new
>viridian_synic_vcpu_deinit() function (which is safe even if
>is_viridian_vcpu() evaluates to false). This replaces the slightly
>hacky mechanism of faking a zero write to the
>HV_X64_MSR_VP_ASSIST_PAGE MSR in viridian_cpu_deinit().
>
>Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>

Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>



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