Messages in this thread | | | Subject | Re: inode->i_wb_list corruption. | From | David Woodhouse <> | Date | Mon, 12 Mar 2012 21:27:15 +0000 |
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On Mon, 2012-03-12 at 17:13 -0400, Josh Boyer wrote: > On Fri, Mar 09, 2012 at 02:44:49PM -0800, Keith Packard wrote: > > <#part sign=pgpmime> > > On Fri, 9 Mar 2012 15:19:34 -0500, Josh Boyer <jwboyer@redhat.com> wrote: > > > > > Is the VT-d issue something in the hardware itself, or do you mean if > > > you have it enabled in the kernel? We've had the intel IOMMU disabled > > > by default in the Fedora kernels for a while now. At least since before > > > 3.2 was released. > > > > I don't know for sure; David Woodhouse gave a scary presentation > > yesterday that makes me unsure of what happens when IOMMU is disabled in > > the kernel, given that much of the hardware is setup by the BIOS. > > Is that presentation something that could be shared? I have to say, > hearing that doesn't really inspire confidence in either the IOMMU or > the kernel.
It was mostly just a rant about the design mistakes we made with the IOMMU — in particular giving the BIOS as much rope as possible for it to hang us with.
If the BIOS exposes the IOMMU but the OS chooses not to enable it, I don't believe there's any problem with that.
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