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[PATCH v4 31/47] x86/vmware: NOP-ify save/restore hooks when using VMware's sched_clock
- To: Paolo Bonzini <pbonzini@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, x86@xxxxxxxxxx, Kiryl Shutsemau <kas@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>, Andy Lutomirski <luto@xxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>, John Stultz <jstultz@xxxxxxxxxx>
- From: Sean Christopherson <seanjc@xxxxxxxxxx>
- Date: Fri, 29 May 2026 08:07:52 -0700
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- Cc: "H . Peter Anvin" <hpa@xxxxxxxxx>, 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>, kvm@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-coco@xxxxxxxxxxxxxxx, linux-hyperv@xxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, David Woodhouse <dwmw@xxxxxxxxxxxx>, Tom Lendacky <thomas.lendacky@xxxxxxx>, Nikunj A Dadhania <nikunj@xxxxxxx>, David Woodhouse <dwmw2@xxxxxxxxxxxxx>, Michael Kelley <mhklinux@xxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>
- Delivery-date: Fri, 29 May 2026 15:12:59 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
NOP-ify the sched_clock save/restore hooks when using VMware's version of
sched_clock. This will allow extending paravirt_set_sched_clock() to set
the save/restore hooks, without having to simultaneously change the
behavior of VMware guests.
Note, it's not at all obvious that it's safe/correct for VMware guests to
do nothing on suspend/resume, but that's a pre-existing problem. Leave it
for a VMware expert to sort out.
Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
---
arch/x86/kernel/cpu/vmware.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/cpu/vmware.c b/arch/x86/kernel/cpu/vmware.c
index 2d0624c66799..051ef89029a7 100644
--- a/arch/x86/kernel/cpu/vmware.c
+++ b/arch/x86/kernel/cpu/vmware.c
@@ -347,8 +347,11 @@ static void __init vmware_paravirt_ops_setup(void)
vmware_cyc2ns_setup();
- if (vmw_sched_clock)
+ if (vmw_sched_clock) {
paravirt_set_sched_clock(vmware_sched_clock);
+ x86_platform.save_sched_clock_state = x86_init_noop;
+ x86_platform.restore_sched_clock_state = x86_init_noop;
+ }
if (vmware_is_stealclock_available()) {
has_steal_clock = true;
--
2.54.0.823.g6e5bcc1fc9-goog
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