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

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

On Wed, 2018-07-11 at 11:46 +0200, Juergen Gross wrote:
> On 11/07/18 11:15, Woodhouse, David wrote:
> > 
> > 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.
>
> Which kernel version are you talking about?
> 
> With upstream commit 60d3450167433f2d099ce2869dc52dd9e7dc9b29 which will
> be part of next stable-4.9 everything is fine.

Right. That's what Simon had also backported. We hadn't spotted it was
already lined up.

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