[PATCH v6 34/51] x86/vmware: NOP-ify save/restore hooks when using VMware's sched_clock
Sean Christopherson <[email protected]> Thu, 6 Aug 2026 16:35:51 -0700
| Newsgroups | org.kernel.vger.linux-hyperv,dev.linux.lists.linux-coco,dev.linux.lists.virtualization,org.kernel.vger.kvm,org.kernel.vger.linux-kernel,org.xenproject.lists.xen-devel |
|---|---|
| Message-ID | <[email protected]> |
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. Reviewed-by: David Woodhouse <[email protected]> Signed-off-by: Sean Christopherson <[email protected]> --- 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 cbe8b59ab79f..94fec990a02c 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; -- 2.55.0.679.g6767b8d81c-goog