diff mbox series

[v2,15/38] x86/xen/time: Nullify x86_platform's sched_clock save/restore hooks

Message ID 20250227021855.3257188-16-seanjc@google.com (mailing list archive)
State New
Headers show
Series x86: Try to wrangle PV clocks vs. TSC | expand

Commit Message

Sean Christopherson Feb. 27, 2025, 2:18 a.m. UTC 
Nullify 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).

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 arch/x86/xen/time.c | 6 ++++++
 1 file changed, 6 insertions(+)
diff mbox series

Patch

diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
index 9e2e900dc0c7..51eba986cd18 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -565,6 +565,12 @@  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 = NULL;
+	x86_platform.restore_sched_clock_state = NULL;
 
 	tsc_register_calibration_routines(xen_tsc_khz, NULL);
 	x86_platform.get_wallclock = xen_get_wallclock;