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 V3: - Address comments from Peter Xu: squash the 3rd patch in v2 into the 2nd patch in this version. - Added "Reviewed-by: Peter Xu <pet...@redhat.com>" 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. --- Cc: "Michael S. Tsirkin" <m...@redhat.com> Cc: Igor Mammedov <imamm...@redhat.com> Cc: Marcel Apfelbaum <marcel.apfelb...@gmail.com> Cc: Paolo Bonzini <pbonz...@redhat.com> Cc: Richard Henderson <r...@twiddle.net> Cc: Eduardo Habkost <ehabk...@redhat.com> Cc: Peter Xu <pet...@redhat.com> --- Yu Zhang (2): intel-iommu: differentiate host address width from IOVA address width. intel-iommu: extend VTD emulation to allow 57-bit IOVA address width. 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
