On Sat, 2015-06-13 at 08:47 +0200, Joerg Roedel wrote: > Hi, > > as David Woodhouse pointed out, my fixes and cleanups for > the original patch-set turned out to be a complete rewrite. > So to have a cleaner history of the feature and to make > backporting easier, here is a rewrite of my changes based on > v4.1-rc7. > > Some additional issues have been fixed by this rewrite, like > a kdump-kernel boot panic with 'iommu=pt' and support for > copying the extended root-entry and context table formats > has been added.
This looks much better than before; thanks. However, it's still fairly gratuitous for all non-broken hardware, and will tend to hide hardware and driver bugs during testing of new hardware. I'd much rather see this limited to a blacklist of known-broken devices, an accompanied by a kernel message along the lines of 'Preserving VT-d page tables for broken HP device xxxx:xxxx' For *any* device which isn't so broken that it craps itself on taking a DMA fault and cannot be reset, this page table copy shouldn't be needed, right? -- David Woodhouse Open Source Technology Centre david.woodho...@intel.com Intel Corporation
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