Re: [Xen-devel] [PATCH] VT-d: improve RMRR validity checking

[Noboru Iwamatsu <n_iwamatsu@xxxxxxxxxxxxxx>]

Hi,

> > I re-send the DRHD-fix patch.
> >
> > If DRHD does not have existent devices, ignore it.
> > If DRHD has both existent and non-existent devices, consider it invalid
> > and not register.
> What happens if you register a DRHD with some but not all devices existing?
> Do bad things happen on some systems?
In the case I have posted the log, DRHD has only non-existent devices,
and maybe its info is invalid. So iommu_enable_translation() failed and
became panic.

When DRHD has at least one existent device, I have not seen,
its info might be correct. I cannot judge it, so disabled at the patch.

Even if this DRHD-ignore patch is not accepted, we should validate the
DRHD and stop the PANIC.


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