> On 04 September 2026 at 10:56 Christian Zigotzky <[email protected]> > wrote: > > On 03 September 2026 at 07:23 Shrikanth Hegde <[email protected]> wrote: > > Friendly LLM analysis says preemption is enabled too early and before > completing kvmppc_handle_exit_hv() / kvmppc_handle_nested_exit() > > Below is ONLY a speculation and completely UNTESTED. > Maybe worth a try. > > --- > diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c > index 0409ac9e7b31..78d2b0618887 100644 > --- a/arch/powerpc/kvm/book3s_hv.c > +++ b/arch/powerpc/kvm/book3s_hv.c > @@ -5049,8 +5049,6 @@ int kvmhv_run_single_vcpu(struct kvm_vcpu *vcpu, u64 > time_limit, > > powerpc_local_irq_pmu_restore(flags); > > - preempt_enable(); > - > /* > * cancel pending decrementer exception if DEC is now positive, or if > * entering a nested guest in which case the decrementer is now owned > @@ -5072,6 +5070,8 @@ int kvmhv_run_single_vcpu(struct kvm_vcpu *vcpu, u64 > time_limit, > } > vcpu->arch.ret = r; > > + preempt_enable(); > + > if (is_kvmppc_resume_guest(r) && !kvmppc_vcpu_check_block(vcpu)) { > kvmppc_set_timer(vcpu); > > > Michal > > - - - > > Michal,
Sorry, I meant Shrikanth. > > Is this patch also for the issues with KVM PR and KVM HV if PREEMPT is > activated? > > The entire FSL Cyrus+ board freezes when using KVM HV with PREEMPT. > > The guest kernel doesn't boot if we use KVM PR with a PREEMPT kernel on > the PA Semi Nemo board. > > Bug report: https://github.com/chzigotzky/kernels/issues/19 > > Thanks, > Christian
