Hi Bjorn,
On Mon, Jul 20, 2015 at 07:13:49PM -0500, Bjorn Helgaas wrote:
> Bjorn Helgaas (11):
> iommu/vt-d: Cache PCI ATS state and Invalidate Queue Depth
> PCI: Allocate ATS struct during enumeration
> PCI: Embed ATS info directly into struct pci_dev
> PCI: Reduce size of ATS structure elements
> PCI: Rationalize pci_ats_queue_depth() error checking
> PCI: Inline the ATS setup code into pci_ats_init()
> PCI: Use pci_physfn() rather than looking up physfn by hand
> PCI: Clean up ATS error handling
> PCI: Move ATS declarations to linux/pci.h so they're all together
> PCI: Stop caching ATS Invalidate Queue Depth
> PCI: Remove pci_ats_enabled()
So while you are at working on ATS, could we probably also introduce a
way to globally disable ATS on a box from the kernel command line
(pci=noats?)? ATS is basically a way for a device to tunnel through the
IOMMU without access checking (because pre-translated requests are not
checked again).
For security reasons it would be good to have a way to disable ATS
completly if desired.
Joerg
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