[Xen-devel] [PATCH v3 0/8] xen: better grant v2 support

[Juergen Gross <jgross@xxxxxxxx>]

Currently Linux has no support for grant v2 as this would reduce the
maximum number of active grants by a factor of 2 compared to v1,
because the number of possible grants are limited by the allowed number
of grant frames and grant entries of v2 need twice as much bytes as
those of v1.

Unfortunately grant v2 is the only way to support either guests with
more than 16TB memory size or PV guests with memory above the 16TB
border, as grant v1 limits the frame number to be 32 bits wide.

In order to remove the disadvantage of grant v2 this patch series
adds support for setting per-domain values regarding grant limits.
Additionally the default limit of grant frames is doubled in case
of hosts with memory above the 16TB border.

Changes in V3:
- patch 1: update commit message
- patch 3: move call of grant_table_init() from gnttab_setup_table() to
  gnttab_grow_table() (Paul Durrant)
- patch 4: correct error message (Paul Durrant)
- patch 6: rename *gnttbl* to *gnttab* (Paul Durrant)

Changes in V2:
- add per-domain grant limits instead of different v1 and v2 limits
- double default limit for huge hosts

Juergen Gross (8):
  xen: move XENMAPSPACE_grant_table code into grant_table.c
  xen: clean up grant_table.h
  xen: delay allocation of grant table sub structures
  xen: make grant resource limits per domain
  xen: double default grant frame limit for huge hosts
  xen: add new domctl hypercall to set grant table resource limits
  libxc: add libxc support for setting grant table resource limits
  libxl: add libxl support for setting grant table resource limits

 docs/man/xl.cfg.pod.5.in            |  15 ++
 tools/flask/policy/modules/dom0.te  |   2 +-
 tools/libxc/include/xenctrl.h       |  14 ++
 tools/libxc/xc_domain.c             |  13 ++
 tools/libxl/libxl.h                 |   6 +
 tools/libxl/libxl_dom.c             |   8 +
 tools/libxl/libxl_types.idl         |   3 +
 tools/xl/xl_parse.c                 |   5 +
 tools/xl/xl_sxp.c                   |   2 +
 xen/arch/arm/mm.c                   |  36 +---
 xen/arch/x86/mm.c                   |  41 +----
 xen/common/domain.c                 |  17 +-
 xen/common/domctl.c                 |   6 +
 xen/common/grant_table.c            | 354 +++++++++++++++++++++++++++---------
 xen/include/asm-arm/grant_table.h   |   7 +
 xen/include/asm-x86/grant_table.h   |   5 +
 xen/include/public/domctl.h         |   9 +
 xen/include/xen/grant_table.h       |  91 +--------
 xen/xsm/flask/hooks.c               |   3 +
 xen/xsm/flask/policy/access_vectors |   2 +
 20 files changed, 401 insertions(+), 238 deletions(-)

-- 
2.12.3


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