[RFC,FUTURE,0/3] Make vSBDF configurable by toolstack

Message

Volodymyr Babchuk Dec. 13, 2023, 11:44 p.m. UTC

This patch series is a follow up for the dicsussion at [1].

It adds ability for toolstack to chose Device part of SBDF for a PCI
device when passing it to DomU. First and last patches are quite
straightforward, but the second one ("tools: libxc: add virtual_sbdf
parameter to xc_assign_device") changes API of libxc, which is big
no-no, so it is just a starting point for a discussion. What is the
best way to do this?

Another topic for discussion is the first patch ("domctl/pci: add
ability to provide/request a virtual SBDF"). It extends existing
domctl for assigning devices, which is fine for this use case. But we
also discussed use case of virtio-pci devices, for which we want to
allocate/request vSBDFs as well. Problem is that we cant't use
assign_device call for this because there is no physical device which
can be assigned. Probably we will need another domctl - specifically
for allocating vSBDFs. But then there would be two domctls that are
capable of allocating vSBDFs: assign_device and this new call... So
yeah, I am open for suggestions.

[1] https://lore.kernel.org/all/[e-mail]/

Volodymyr Babchuk (3):
  domctl/pci: add ability to provide/request a virtual SBDF
  tools: libxc: add virtual_sbdf parameter to xc_assign_device
  tools: libxl: use "vslot" parameter when assigning a PCI device

 tools/include/xenctrl.h             |  1 +
 tools/libs/ctrl/xc_domain.c         | 13 +++++++++-
 tools/libs/light/libxl_pci.c        |  9 +++++--
 tools/ocaml/libs/xc/xenctrl_stubs.c |  2 +-
 tools/python/xen/lowlevel/xc/xc.c   |  2 +-
 xen/drivers/passthrough/pci.c       | 17 ++++++++-----
 xen/drivers/vpci/vpci.c             | 38 +++++++++++++++++++++++------
 xen/include/public/domctl.h         |  9 ++++++-
 xen/include/xen/vpci.h              |  4 +--
 9 files changed, 73 insertions(+), 22 deletions(-)