RE: [PATCH V9 00/10] Nested Shared Virtual Address (SVA) VT-d support

[Liu, Yi L]

> From: Jacob Pan [mailto:jacob.jun.pan@xxxxxxxxxxxxxxx]
> Sent: Wednesday, January 29, 2020 2:02 PM
> Subject: [PATCH V9 00/10] Nested Shared Virtual Address (SVA) VT-d support
> 
> Shared virtual address (SVA), a.k.a, Shared virtual memory (SVM) on Intel platforms
> allow address space sharing between device DMA and applications.
> SVA can reduce programming complexity and enhance security.
> This series is intended to enable SVA virtualization, i.e. enable use of SVA within a
> guest user application.
> 
> This is the remaining portion of the original patchset that is based on Joerg's x86/vt-
> d branch. The preparatory and cleanup patches are merged here.
> (git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git)
> 
> Only IOMMU portion of the changes are included in this series. Additional support is
> needed in VFIO and QEMU (will be submitted separately) to complete this
> functionality.
> 
> To make incremental changes and reduce the size of each patchset. This series does
> not inlcude support for page request services.
> 
> In VT-d implementation, PASID table is per device and maintained in the host.
> Guest PASID table is shadowed in VMM where virtual IOMMU is emulated.
> 
>     .-------------.  .---------------------------.
>     |   vIOMMU    |  | Guest process CR3, FL only|
>     |             |  '---------------------------'
>     .----------------/
>     | PASID Entry |--- PASID cache flush -
>     '-------------'                       |
>     |             |                       V
>     |             |                CR3 in GPA
>     '-------------'
> Guest
> ------| Shadow |--------------------------|--------
>       v        v                          v
> Host
>     .-------------.  .----------------------.
>     |   pIOMMU    |  | Bind FL for GVA-GPA  |
>     |             |  '----------------------'
>     .----------------/  |
>     | PASID Entry |     V (Nested xlate)
>     '----------------\.------------------------------.
>     |             |   |SL for GPA-HPA, default domain|
>     |             |   '------------------------------'
>     '-------------'
> Where:
>  - FL = First level/stage one page tables
>  - SL = Second level/stage two page tables
> 
> This is the remaining VT-d only portion of V5 since the uAPIs and IOASID common
> code have been applied to Joerg's IOMMU core branch.
> (https://lkml.org/lkml/2019/10/2/833)
> 
> The complete set with VFIO patches are here:
> https://github.com/jacobpan/linux.git:siov_sva

The complete QEMU set can be found in below link:
https://github.com/luxis1999/qemu.git: sva_vtd_v9_rfcv3

Complete kernel can be found in:
https://github.com/luxis1999/linux-vsva: vsva-linux-5.5-rc3

Regards,
Yi Liu