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

Liu, Yi L
2020-01-29T12:18:10Z

> From: Jacob Pan [mailto:jacob.jun.pan@linux.intel.com]
> 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