[PATCH v6 33/51] x86/xen/time: NOP-ify x86_platform's sched_clock save/restore hooks
Sean Christopherson <[email protected]>
| Newsgroups | org.xenproject.lists.xen-devel,dev.linux.lists.linux-coco,dev.linux.lists.virtualization,org.kernel.vger.kvm,org.kernel.vger.linux-hyperv,org.kernel.vger.linux-kernel |
|---|---|
| Message-ID | <[email protected]> |
NOP-ify the x86_platform sched_clock save/restore hooks when setting up Xen's PV clock to make it somewhat obvious the hooks aren't used when running as a Xen guest (Xen uses a paravirtualized suspend/resume flow). Reviewed-by: David Woodhouse <[email protected]> Signed-off-by: Sean Christopherson <[email protected]> --- arch/x86/xen/time.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c index 487ad838c441..477441752f40 100644 --- a/arch/x86/xen/time.c +++ b/arch/x86/xen/time.c @@ -567,6 +567,12 @@ static void __init xen_init_time_common(void) xen_sched_clock_offset = xen_clocksource_read(); static_call_update(pv_steal_clock, xen_steal_clock); paravirt_set_sched_clock(xen_sched_clock); + /* + * Xen has paravirtualized suspend/resume and so doesn't use the common + * x86 sched_clock save/restore hooks. + */ + x86_platform.save_sched_clock_state = x86_init_noop; + x86_platform.restore_sched_clock_state = x86_init_noop; x86_init.hyper.get_tsc_khz = xen_tsc_khz; x86_platform.get_wallclock = xen_get_wallclock; -- 2.55.0.679.g6767b8d81c-goog