Re: [PATCH v2 3/7] x86: Add nopv parameter to disable PV extensions

[Juergen Gross]

On 24.06.19 14:02, Zhenzhong Duan wrote:
> In virtualization environment, PV extensions (drivers, interrupts,
> timers, etc) are enabled in the majority of use cases which is the
> best option.
>
> However, in some cases (kexec not fully working, benchmarking)
> we want to disable PV extensions. As such introduce the
> 'nopv' parameter that will do it.
>
> There are guest types which just won't work without PV extensions,
> like Xen PV, Xen PVH and jailhouse. add a "ignore_nopv" member to
> struct hypervisor_x86 set to true for those guest types and call
> the detect functions only if nopv is false or ignore_nopv is true.
>
> There is already 'xen_nopv' parameter for XEN platform but not for
> others. 'xen_nopv' can then be removed with this change.
>
> Suggested-by: Juergen Gross <jgross@xxxxxxxx>
> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@xxxxxxxxxx>
> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> Cc: Borislav Petkov <bp@xxxxxxxxx>
> Cc: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
> Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
> Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx

Reviewed-by: Juergen Gross <jgross@xxxxxxxx>


Juergen