Hi Greg,
On Thu, Oct 10, 2024 at 11:31 AM Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote:
>
> On Thu, Oct 10, 2024 at 11:13:42AM +0200, Jinpu Wang wrote:
> > Hi Greg,
> >
> > On Thu, Oct 10, 2024 at 11:07 AM Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote:
> > >
> > > On Thu, Oct 10, 2024 at 09:31:37AM +0200, Jinpu Wang wrote:
> > > > Hello all,
> > > >
> > > > We are experiencing a boot hang issue when booting kernel version
> > > > 6.1.83+ on a Dell Inc. PowerEdge R770 equipped with an Intel Xeon
> > > > 6710E processor. After extensive testing and use of `git bisect`, we
> > > > have traced the issue to commit:
> > > >
> > > > `586e19c88a0c ("iommu/vt-d: Retrieve IOMMU perfmon capability information")`
> > > >
> > > > This commit appears to be part of a larger patchset, which can be found here:
> > > > [Patchset on lore.kernel.org](https://lore.kernel.org/lkml/7c4b3e4e-1c5d-04f1-1891-84f686c94736@xxxxxxxxxxxxxxx/T/)
> > > >
> > > > We attempted to boot with the `intel_iommu=off` option, but the system
> > > > hangs in the same manner. However, the system boots successfully after
> > > > disabling `CONFIG_INTEL_IOMMU_PERF_EVENTS`.
> > >
> > > Is there any error messages? Does the latest 6.6.y tree work properly?
> > > If so, why not just use that, no new hardware should be using older
> > > kernel trees anyway :)
> > No error, just hang, I've removed "quiet" and added "debug".
> > Yes, the latest 6.6.y tree works for this, but there are other
> > problems/dependency we have to solve.
>
> Ok, that implies that we need to add some other patch to 6.1.y, OR we
> can revert it from 6.1.y. Let me know what you think is the better
> thing to do.
>
I think better to revert both:
8c91a4bfc7f8 ("iommu: Fix compilation without CONFIG_IOMMU_INTEL")
586e19c88a0c ("iommu/vt-d: Retrieve IOMMU perfmon capability information")
unless other guys have a different opinon.
> thanks,
>
> greg k-h
Thanks!
