Re: [Xen-devel] [PATCH 2/3] xen: set cpu capabilities from xen_start_kernel()

["Woodhouse, David" <dwmw@xxxxxxxxxxxx>]

On Wed, 2018-05-30 at 13:09 +0200, Juergen Gross wrote:
> There is no need to set the same capabilities for each cpu
> individually. This can easily be done for all cpus when starting the
> kernel.
> 
> Upstream commit: 0808e80cb760de2733c0527d2090ed2205a1eef8 ("xen: set
> cpu capabilities from xen_start_kernel()")
> 
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>

That breaks PV guests because they get KAISER enabled — when
kaiser_check_boottime_disable() runs, X86_FEATURE_XENPV isn't set.

Simon is testing, and about to send a fix...

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