Re: [PATCH kvm-unit-tests 2/2] arm64: add micro-bench

[Andrew Jones <drjones@redhat.com>]

On Tue, Sep 04, 2018 at 11:02:43AM -0400, Shih-Wei Li wrote:
> I've tested patch v2 along with the fix in the switch case. The
> performance numbers look sane on my seattle server.
> 
> Tested-by: Shih-Wei Li <shihwei@cs.columbia.edu>

Thanks Shih-Wei. I'll send v3 now with the breaks and add yours
and Christoffer's tested-bys.

drew

> 
> Thanks,
> Shih-Wei
> 
> On Mon, Sep 3, 2018 at 11:38 PM, Shih-Wei Li <shihwei@cs.columbia.edu> wrote:
> > On Mon, Sep 3, 2018 at 12:31 PM, Andrew Jones <drjones@redhat.com> wrote:
> >> On Mon, Sep 03, 2018 at 11:06:51AM -0400, Shih-Wei Li wrote:
> >>> On Thu, Aug 30, 2018 at 10:17 AM, Andrew Jones <drjones@redhat.com> wrote:
> >>> > +static bool test_init(void)
> >>> > +{
> >>> > +       int v = gic_init();
> >>> > +
> >>> > +       if (!v) {
> >>> > +               printf("No supported gic present, skipping tests...\n");
> >>> > +               return false;
> >>> > +       }
> >>> > +
> >>> > +       if (nr_cpus < 2) {
> >>> > +               printf("At least two cpus required, skipping tests...\n");
> >>> > +               return false;
> >>> > +       }
> >>> > +
> >>> > +       switch (v) {
> >>> > +       case 2:
> >>> > +               vgic_dist_base = gicv2_dist_base();
> >>> > +               write_eoir = gicv2_write_eoir;
> >>> > +       case 3:
> >>> > +               vgic_dist_base = gicv3_dist_base();
> >>> > +               write_eoir = gicv3_write_eoir;
> >>> > +       }
> >>>
> >>> I think we'll need a "break" in the switch case body for gicv2 here
> >>> otherwise it'll fall into the case body below and refer to the wrong
> >>> symbols for gicv3.
> >>>
> >>> As I've tested on my seattle server hardware (with gicv2), this results
> >>> to incorrect execution in mmio_read_vgic_exec and a crash in
> >>> eoi_exec().
> >>>
> >>
> >> Argh... Obviously my testing of this was pretty poor. You are certainly
> >> right that I'm missing breaks in this switch. If you don't mind, please
> >> add them, along with the fix in v2, to your local repo and test again.
> >> I'll hold off on sending v3 until you've had a chance to test and review
> >> more.
> >>
> >> Thanks,
> >> drew
> >
> > I've added the break to the switch and it resolved the problems I
> > mentioned earlier. I'll do more testing and reviewing, and will get
> > back to you as soon as I can.
> >
> > Thanks for formalizing the new patch set for micro-test!
> >
> > Shih-Wei
>