Re: [RFC PATCH 0/8] Shared Virtual Memory virtualization for VT-d

[Xiao Guangrong <guangrong.xiao@gmail.com>]

Hi Liu Yi,

I haven't started to read the code yet, however, could you
detail more please? It emulates a SVM capable iommu device in
a VM? Or It speeds up device's DMA access in a VM? Or it is a
new facility introduced for a VM? Could you please add a bit
more for its usage?

Thanks!

On 04/26/2017 06:11 PM, Liu, Yi L wrote:
> Hi,
> 
> This patchset introduces SVM virtualization for intel_iommu in
> IOMMU/VFIO. The total SVM virtualization for intel_iommu touched
> Qemu/IOMMU/VFIO.
> 
> Another patchset would change the Qemu. It is "[RFC PATCH 0/20] Qemu:
> Extend intel_iommu emulator to support Shared Virtual Memory"
> 
> In this patchset, it adds two new IOMMU APIs and their implementation
> in intel_iommu driver. In VFIO, it adds two IOCTL cmd attached on
> container->fd to propagate data from QEMU to kernel space.
> 
> [Patch Overview]
> * 1 adds iommu API definition for binding guest PASID table
> * 2 adds binding PASID table API implementation in VT-d iommu driver
> * 3 adds iommu API definition to do IOMMU TLB invalidation from guest
> * 4 adds IOMMU TLB invalidation implementation in VT-d iommu driver
> * 5 adds VFIO IOCTL for propagating PASID table binding from guest
> * 6 adds processing of pasid table binding in vfio_iommu_type1
> * 7 adds VFIO IOCTL for propagating IOMMU TLB invalidation from guest
> * 8 adds processing of IOMMU TLB invalidation in vfio_iommu_type1
> 
> Best Wishes,
> Yi L
> 
> 
> Jacob Pan (3):
>    iommu: Introduce bind_pasid_table API function
>    iommu/vt-d: add bind_pasid_table function
>    iommu/vt-d: Add iommu do invalidate function
> 
> Liu, Yi L (5):
>    iommu: Introduce iommu do invalidate API function
>    VFIO: Add new IOTCL for PASID Table bind propagation
>    VFIO: do pasid table binding
>    VFIO: Add new IOCTL for IOMMU TLB invalidate propagation
>    VFIO: do IOMMU TLB invalidation from guest
> 
>   drivers/iommu/intel-iommu.c     | 146 ++++++++++++++++++++++++++++++++++++++++
>   drivers/iommu/iommu.c           |  32 +++++++++
>   drivers/vfio/vfio_iommu_type1.c |  98 +++++++++++++++++++++++++++
>   include/linux/dma_remapping.h   |   1 +
>   include/linux/intel-iommu.h     |  11 +++
>   include/linux/iommu.h           |  47 +++++++++++++
>   include/uapi/linux/vfio.h       |  26 +++++++
>   7 files changed, 361 insertions(+)
>