Am 05.02.2015 um 17:35 schrieb r...@redhat.com: > From: Rik van Riel <r...@redhat.com> > > The host kernel is not doing anything while the CPU is executing > a KVM guest VCPU, so it can be marked as being in an extended > quiescent state, identical to that used when running user space > code. > > The only exception to that rule is when the host handles an > interrupt, which is already handled by the irq code, which > calls rcu_irq_enter and rcu_irq_exit. > > The guest_enter and guest_exit functions already switch vtime > accounting independent of context tracking, so leave those calls > where they are, instead of moving them into the context tracking > code. > > Signed-off-by: Rik van Riel <r...@redhat.com> > --- > include/linux/context_tracking.h | 8 +++++++- > include/linux/context_tracking_state.h | 1 + > 2 files changed, 8 insertions(+), 1 deletion(-) > > diff --git a/include/linux/context_tracking.h > b/include/linux/context_tracking.h > index bd9f000fc98d..a5d3bb44b897 100644 > --- a/include/linux/context_tracking.h > +++ b/include/linux/context_tracking.h > @@ -43,7 +43,7 @@ static inline enum ctx_state exception_enter(void) > static inline void exception_exit(enum ctx_state prev_ctx) > { > if (context_tracking_is_enabled()) { > - if (prev_ctx == IN_USER) > + if (prev_ctx == IN_USER || prev_ctx == IN_GUEST) > context_tracking_user_enter(prev_ctx); > } > } > @@ -78,6 +78,9 @@ static inline void guest_enter(void) > vtime_guest_enter(current); > else > current->flags |= PF_VCPU; > + > + if (context_tracking_is_enabled()) > + context_tracking_user_enter(IN_GUEST); > }
Couldnt we make rcu_virt_note_context_switch(smp_processor_id()); conditional in include/linux/kvm_host.h (kvm_guest_enter) e.g. something like if (!context_tracking_is_enabled()) rcu_virt_note_context_switch(smp_processor_id()); -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html