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[PATCH v3 15/41] x86/xen/time: Nullify x86_platform's sched_clock save/restore hooks
- To: Kiryl Shutsemau <kas@xxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, Sean Christopherson <seanjc@xxxxxxxxxx>, "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>, Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>, Wei Liu <wei.liu@xxxxxxxxxx>, Dexuan Cui <decui@xxxxxxxxxxxxx>, Long Li <longli@xxxxxxxxxxxxx>, Ajay Kaher <ajay.kaher@xxxxxxxxxxxx>, Alexey Makhalov <alexey.makhalov@xxxxxxxxxxxx>, Jan Kiszka <jan.kiszka@xxxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxx>, John Stultz <jstultz@xxxxxxxxxx>
- From: Sean Christopherson <seanjc@xxxxxxxxxx>
- Date: Fri, 15 May 2026 12:19:16 -0700
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- Cc: Rick Edgecombe <rick.p.edgecombe@xxxxxxxxx>, Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>, Broadcom internal kernel review list <bcm-kernel-feedback-list@xxxxxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Stephen Boyd <sboyd@xxxxxxxxxx>, x86@xxxxxxxxxx, linux-coco@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, linux-hyperv@xxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, Michael Kelley <mhklinux@xxxxxxxxxxx>, Tom Lendacky <thomas.lendacky@xxxxxxx>, Nikunj A Dadhania <nikunj@xxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, David Woodhouse <dwmw@xxxxxxxxxxxx>
- Delivery-date: Fri, 15 May 2026 19:20:52 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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@xxxxxxxxxx>
---
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 3d3165eef821..21d366d01985 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -568,6 +568,12 @@ 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;
--
2.54.0.563.g4f69b47b94-goog
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