On Fri, Jul 21, 2017 at 04:59:09PM +0800, Baoquan He wrote: > When iommu is pre_enabled in kdump kernel, if a device is set up with > guest translations (DTE.GV=1), then don't copy GCR3 table root pointer > but move the device over to an empty guest-cr3 table and handle the > faults in the PPR log (which answer them with INVALID). After all these > PPR faults are recoverable for the device and we should not allow the > device to change old-kernels data when we don't have to.
Okay, forget my previous comment about disabling IOMMUv2 features while copying. Its done in this patch.
