On 1/8/18 3:44 PM, Anthony Liguori wrote: > > It's not particularly hard to plumb through I think but if you are > using PCI passthrough for PV, then you really shouldn't worry about > Spectre/Meltdown. That PV guest can already read all of physical > memory (since no IOMMU is used) and they can also write to all > physical memory which is far worse than what you can do with > Spectre/Meltdown. >
That's certainly not true. The IOMMU is used by default with PV if its available since Xen 4.0.1. Prior to that there was an option that was "iommu=pv" which was not the default for 4.0.0. Its certainly possible that's true for Xen 3.4 however. -- Doug Goldstein
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