On Thu, Jun 19, 2014 at 03:28:25PM -0300, Marcelo Tosatti wrote:
> On Thu, Jun 19, 2014 at 09:48:50AM +0300, Gleb Natapov wrote:
> > On Wed, Jun 18, 2014 at 08:12:06PM -0300, [email protected] wrote:
> > > Request KVM_REQ_MMU_RELOAD when deleting sptes from MMU notifiers.
> > >
> > > Keep pinned sptes intact if page aging.
> > >
> > > Signed-off-by: Marcelo Tosatti <[email protected]>
> > >
> > > ---
> > > arch/x86/kvm/mmu.c | 71
> > > ++++++++++++++++++++++++++++++++++++++++++++++-------
> > > 1 file changed, 62 insertions(+), 9 deletions(-)
> > >
> > > Index: kvm.pinned-sptes/arch/x86/kvm/mmu.c
> > > ===================================================================
> > > --- kvm.pinned-sptes.orig/arch/x86/kvm/mmu.c 2014-06-18
> > > 17:28:24.339435654 -0300
> > > +++ kvm.pinned-sptes/arch/x86/kvm/mmu.c 2014-06-18 17:29:32.510225755
> > > -0300
> > > @@ -1184,6 +1184,42 @@
> > > kvm_flush_remote_tlbs(vcpu->kvm);
> > > }
> > >
> > > +static void ack_flush(void *_completed)
> > > +{
> > > +}
> > > +
> > > +static void mmu_reload_pinned_vcpus(struct kvm *kvm)
> > > +{
> > > + int i, cpu, me;
> > > + cpumask_var_t cpus;
> > > + struct kvm_vcpu *vcpu;
> > > + unsigned int req = KVM_REQ_MMU_RELOAD;
> > > +
> > > + zalloc_cpumask_var(&cpus, GFP_ATOMIC);
> > > +
> > > + me = get_cpu();
> > > + kvm_for_each_vcpu(i, vcpu, kvm) {
> > > + if (list_empty(&vcpu->arch.pinned_mmu_pages))
> > > + continue;
> > > + kvm_make_request(req, vcpu);
> > > + cpu = vcpu->cpu;
> > > +
> > > + /* Set ->requests bit before we read ->mode */
> > > + smp_mb();
> > > +
> > > + if (cpus != NULL && cpu != -1 && cpu != me &&
> > > + kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE)
> > > + cpumask_set_cpu(cpu, cpus);
> > > + }
> > > + if (unlikely(cpus == NULL))
> > > + smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1);
> > > + else if (!cpumask_empty(cpus))
> > > + smp_call_function_many(cpus, ack_flush, NULL, 1);
> > > + put_cpu();
> > > + free_cpumask_var(cpus);
> > > + return;
> > > +}
> > This is a c&p of make_all_cpus_request(), the only difference is checking
> > of vcpu->arch.pinned_mmu_pages. You can add make_some_cpus_request(...,
> > bool (*predicate)(struct kvm_vcpu *))
> > to kvm_main.c and rewrite make_all_cpus_request() to use it instead.
>
> Half-way through it i decided it was better to c&p.
>
> Can change make_all_cpus_request() though if it makes more sense to you.
>
If I haven't missed anything and checking of pinned_mmu_pages is indeed the
only difference, then yes, reusing make_all_cpus_request() makes more sense.
--
Gleb.
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