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charset="utf-8" When the outgoing vCPU had IBPB issued upon entering Xen there's no need for a 2nd barrier during context switch. Signed-off-by: Jan Beulich --- a/xen/arch/x86/domain.c +++ b/xen/arch/x86/domain.c @@ -2098,7 +2098,8 @@ void context_switch(struct vcpu *prev, s =20 ctxt_switch_levelling(next); =20 - if ( opt_ibpb_ctxt_switch && !is_idle_domain(nextd) ) + if ( opt_ibpb_ctxt_switch && !is_idle_domain(nextd) && + !(prevd->arch.spec_ctrl_flags & SCF_entry_ibpb) ) { static DEFINE_PER_CPU(unsigned int, last); unsigned int *last_id =3D &this_cpu(last);