Re: [Xen-devel] [RFC PATCH 0/7] Implement Xen PV-IOMMU interface

[Martin Cerveny <martin@xxxxxxxxx>]

Hello.

Any update on this ?

Thanks, Martin Cerveny

On Wed, 10 Feb 2016, Malcolm Crossley wrote:

> This RFC series implements the PV-IOMMU interface according to the PV-IOMMU
> design draft D.
>
> The PV-IOMMU interface is currently restricted to being used by the hardware
> domain only as non hardware domain callers have not been fully tested yet.
>
> Significant effort was put into implementing a m2b tracking structure without
> increasing the size of struct page but no union was found that could be safely
> used in all cases when a page is allocated to an HVM domain. Comments and
> feedback on the m2b design are most welcome.
>
> The hardware domain specific IOMMU pre map mechanism was implemented in order
> to keep performance parity with current out of tree mechanisms to obtain BFNs
> for foreign guest owned memory. The pre map mechanism is not a weakening of
> the current security model of Xen and is only allowed when the hardware domain
> is allowed relaxed IOMMU mappings.
>
>
> Malcolm Crossley (7):
>  common/pv-iommu: Add stub hypercall for PV-IOMMU
>  iommu: add iommu_lookup_page to lookup guest gfn for a particular
>    IOMMU mapping
>  VT-d: Add iommu_lookup_page support
>  common/pv-iommu: Add query, map and unmap ops
>  x86/m2b: Add a tracking structure for mfn to bfn mappings per page
>  common/pv-iommu: Add foreign ops to PV-IOMMU interface
>  common/pv-iommu: Allow hardware_domain to pre IOMMU map foreign
>    memory
>
> xen/arch/x86/domain.c               |  12 +-
> xen/arch/x86/mm/Makefile            |   1 +
> xen/arch/x86/mm/m2b.c               | 211 ++++++++++++
> xen/arch/x86/x86_64/compat/entry.S  |   2 +
> xen/arch/x86/x86_64/entry.S         |   2 +
> xen/common/Makefile                 |   1 +
> xen/common/memory.c                 |  11 +
> xen/common/pv_iommu.c               | 633 ++++++++++++++++++++++++++++++++++++
> xen/drivers/passthrough/iommu.c     |  21 ++
> xen/drivers/passthrough/vtd/iommu.c |  31 ++
> xen/drivers/passthrough/vtd/iommu.h |   1 +
> xen/include/asm-x86/domain.h        |   1 +
> xen/include/asm-x86/m2b.h           |  65 ++++
> xen/include/asm-x86/mm.h            |  12 +-
> xen/include/public/hvm/ioreq.h      |   1 +
> xen/include/public/pv-iommu.h       |  93 ++++++
> xen/include/public/xen.h            |   1 +
> xen/include/xen/iommu.h             |   2 +
> xen/include/xen/sched.h             |   4 +
> xen/include/xsm/dummy.h             |   6 +
> xen/include/xsm/xsm.h               |   6 +
> xen/xsm/dummy.c                     |   1 +
> 22 files changed, 1116 insertions(+), 2 deletions(-)
> create mode 100644 xen/arch/x86/mm/m2b.c
> create mode 100644 xen/common/pv_iommu.c
> create mode 100644 xen/include/asm-x86/m2b.h
> create mode 100644 xen/include/public/pv-iommu.h
>
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