linux-kernel - [PATCH V2 0/3] vDPA: API for reporting IOVA range

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Date:   Fri, 21 Aug 2020 05:28:10 -0400
From:   Jason Wang <jasowang@...hat.com>
To:     mst@...hat.com, virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Cc:     rob.miller@...adcom.com, lingshan.zhu@...el.com,
        eperezma@...hat.com, lulu@...hat.com, shahafs@...lanox.com,
        hanand@...inx.com, mhabets@...arflare.com, gdawar@...inx.com,
        saugatm@...inx.com, vmireyno@...vell.com,
        zhangweining@...jie.com.cn, eli@...lanox.com,
        Jason Wang <jasowang@...hat.com>
Subject: [PATCH V2 0/3] vDPA: API for reporting IOVA range

Hi All:

This series introduces API for reporing IOVA range. This is a must for
userspace to work correclty:

- for the process that uses vhost-vDPA directly to properly allocate
  IOVA
- for VM(qemu), when vIOMMU is not enabled, fail early if GPA is out
  of range
- for VM(qemu), when vIOMMU is enabled, determine a valid guest
  address width

Please review.

Changes from V1:

- do not mandate get_iova_range() for device with its own DMA
  translation logic and assume a [0, ULLONG_MAX] range
- mandate IOVA range only for IOMMU that forcing aperture
- forbid the map which is out of the IOVA range in vhost-vDPA

Thanks

Jason Wang (3):
  vdpa: introduce config op to get valid iova range
  vhost: vdpa: report iova range
  vdpa_sim: implement get_iova_range()

 drivers/vdpa/vdpa_sim/vdpa_sim.c | 12 ++++++++++
 drivers/vhost/vdpa.c             | 41 ++++++++++++++++++++++++++++++++
 include/linux/vdpa.h             | 15 ++++++++++++
 include/uapi/linux/vhost.h       |  4 ++++
 include/uapi/linux/vhost_types.h |  9 +++++++
 5 files changed, 81 insertions(+)

-- 
2.18.1