MSIX failure

[Jack Vogel]

Gareth's email bouncing for anybody else or is it just me?

Gareth,  set hw.pci.honor_msi_blacklist=0, you'll have to do that at boot
btw.

Tell me more exactly the make/model of the hardware so I might try to get
my hands on one?

Jack


On Thu, Sep 9, 2010 at 1:20 PM, John Baldwin <jhb at freebsd.org> wrote:

> On Thursday, September 09, 2010 3:04:27 pm Jack Vogel wrote:
> > On Thu, Sep 9, 2010 at 11:37 AM, John Baldwin <jhb at freebsd.org> wrote:
> >
> > > On Thursday, September 09, 2010 12:41:07 pm Jack Vogel wrote:
> > > > On Thu, Sep 9, 2010 at 7:33 AM, Kurt Jaeger <pi at opsec.eu> wrote:
> > > >
> > > > > Hi!
> > > > >
> > > > > > > Is this within a jail or something else along those lines?  I
> can't
> > > > > > > reproduce the problem otherwise.  Frustrating!  Someone else on
> the
> > > > > list
> > > > > > > might have ideas as to what could cause this.
> > > > > >
> > > > > > Nope, this's a normal host. I've got securelevel on 1, but doubt
> that
> > > > > > would affect this?
> > > > >
> > > > > I assume it affects it.
> > > > >
> > > > > http://www.freebsd.org/doc/en/books/faq/security.html#SECURELEVEL
> > > > >
> > > > > Basically, when the securelevel is positive, the kernel restricts
> > > > > certain tasks; not even the superuser (i.e., root) is allowed to
> > > > > do them.
> > > > >
> > > > > There:
> > > > >
> > > > > # Write to kernel memory via /dev/mem and /dev/kmem.
> > > > >
> > > > > So I assume it also restricts reading /dev/kmem ?
> > > > >
> > > > >
> > > > OH YUCK, another root isn't really root, so is it also possibly
> > > > the reason for the MSIX failure?? Is this pile, er feature, on by
> > > default?
> > >
> > > securelevel does not affect any of the MSI/MSI-X bits.
> > >
> >
> > Well then there's something else funny going on with that hardware, as at
> > least MSI should work with the chipset, I am not able to get that exact
> > skew from what I am told.
>
> I think the first would be to disable the MSI blacklists via a tunable to
> see
> if that enables MSI.
>
> --
> John Baldwin
>