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

On 11/07/18 11:15, Woodhouse, David wrote:

On Wed, 2018-05-30 at 13:09 +0200, Juergen Gross wrote:

quoted

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@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>

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.


Juergen