[Qemu-devel] [PATCH v2 0/3] intel-iommu: add support for 5-level virtual IOMMU.

[Yu Zhang <yu.c.zhang@linux.intel.com>]

Intel's upcoming processors will extend maximum linear address width to
57 bits, and introduce 5-level paging for CPU. Meanwhile, the platform
will also extend the maximum guest address width for IOMMU to 57 bits,
thus introducing the 5-level paging for 2nd level translation(See chapter
3 in Intel Virtualization Technology for Directed I/O). 

This patch series extends the current logic to support a wider address width.
A 5-level paging capable IOMMU(for 2nd level translation) can be rendered
with configuration "device intel-iommu,x-aw-bits=57".

Also, kvm-unit-tests were updated to verify this patch series. Patch for
the test was sent out at: https://www.spinics.net/lists/kvm/msg177425.html.

Note: this patch series checks the existance of 5-level paging in the host
and in the guest, and rejects configurations for 57-bit IOVA if either check
fails(VTD-d hardware shall not support 57-bit IOVA on platforms without CPU
5-level paging). However, current vIOMMU implementation still lacks logic to
check against the physical IOMMU capability, future enhancements are expected
to do this.

Changes in V2:
- Address comments from Peter Xu: add haw member in vtd_page_walk_info.
- Address comments from Peter Xu: only searches for 4K/2M/1G mappings in
iotlb are meaningful. 
- Address comments from Peter Xu: cover letter changes(e.g. mention the test
patch in kvm-unit-tests).
- Coding style changes.


Yu Zhang (3):
  intel-iommu: differentiate host address width from IOVA address width.
  intel-iommu: extend VTD emulation to allow 57-bit IOVA address width.
  intel-iommu: extend iotlb search logic to cover 57-bit IOVA.
---
Cc: "Michael S. Tsirkin" <mst@redhat.com> 
Cc: Igor Mammedov <imammedo@redhat.com> 
Cc: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
Cc: Paolo Bonzini <pbonzini@redhat.com> 
Cc: Richard Henderson <rth@twiddle.net> 
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Peter Xu <peterx@redhat.com>


 hw/i386/acpi-build.c           |  2 +-
 hw/i386/intel_iommu.c          | 96 +++++++++++++++++++++++++++++-------------
 hw/i386/intel_iommu_internal.h | 10 ++++-
 include/hw/i386/intel_iommu.h  | 10 +++--
 4 files changed, 81 insertions(+), 37 deletions(-)

-- 
1.9.1