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[RFC PATCH 0/2] QEMU: Dynamic trap/untrap of VFIO PCI BARs

From: Yan Zhao
Subject: [RFC PATCH 0/2] QEMU: Dynamic trap/untrap of VFIO PCI BARs
Date: Wed, 4 Dec 2019 22:44:51 -0500

This patchset enables PCI BARs to be dynamically trapped/passthroughed
in response to vendor driver's needs.

To dynamic trap/untrap PCI BARs, 3 info required:
(1) which part of PCI BARs are to be trapped/passthroughed
(2) when to do the trap/passthrough transition
(3) to trap or to passthrough

Patch 1 let vendor driver specify which sparse mmaped subregions are
disablable. Therefore providing the first info.

Patch 2 probes and creates dynamic trap bar info region, whose
"dt_fd" field provides the second info, and
"trap" field provide the third info.

The corresponding kernel implementation is at

Yan Zhao (2):
  hw/vfio: add a 'disablable' flag to sparse mmaped region
  hw/vfio/pci: init dynamic-trap-bar-info region

 hw/vfio/common.c              |  28 +++++++-
 hw/vfio/pci.c                 | 117 ++++++++++++++++++++++++++++++++++
 hw/vfio/pci.h                 |   5 ++
 hw/vfio/trace-events          |   4 +-
 include/hw/vfio/vfio-common.h |   2 +
 linux-headers/linux/vfio.h    |  13 ++++
 6 files changed, 167 insertions(+), 2 deletions(-)


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