[Qemu-devel] [PATCH v7 00/12] vfio-pci: pass the aer error to guest

[Zhou Jie]

From: Chen Fan <address@hidden>

v6-v7:
   1. Stall any access to the device until resume is signaled.
      Do guest directed bus reset after receive resume notification.
      If don't get the resume notification after some timeout unplug the device.
   2. fix the patches 11/12 as Alex sugguestion.

v5-v6:
   1. register resume handler both qemu and kernel to ensure the
      reset in order.
   2. fix the patches 6/12, 7/12 as Alex and MST sugguestion.

v4-v5:
   1. add back the common function 0 hotplug code in pci core.
   2. fix a sporadic device stuck on D3 problem when doing aer recovery.
   3. fix patches 5/12 ~ 9/12 as Alex sugguestion.

v3-v4:
   1. rebase patchset to fit latest master branch.
   2. modifying patches 5/10 ~ 8/10 as Alex sugguestion(Thanks).

v2-v3:
   1. fix patch 4/9, 5/9 as Alex sugguestion.
   2. patches 5/9 ~ 8/9 are made to force limiting that all vfio functions
      are combined in the same way as on the host.

v1-v2:
   1. limit all devices on same bus in guest are on same bus in host in patch 

For now, for vfio pci passthough devices, when qemu receives
an error from host aer report, it just terminate the guest.
But usually user want to know what error occurred. So these patches add
aer capability support for vfio devices, and pass the error to guest.
Then let guest driver to recover from the error.

notes: this series patches enable aer support single/multi-function,
for multi-function, require all the function of the slot assigned to
VM and on the same slot.

Chen Fan (12):
  vfio: extract vfio_get_hot_reset_info as a single function
  vfio: squeeze out vfio_pci_do_hot_reset for support bus reset
  vfio: add pcie extended capability support
  vfio: add aer support for vfio device
  vfio: refine function vfio_pci_host_match
  vfio: add check host bus reset is support or not
  pci: add a pci_function_is_valid callback to check function if valid
  vfio: add check aer functionality for hotplug device
  vfio: vote the function 0 to do host bus reset when aer occurred
  vfio-pci: pass the aer error to guest
  vfio: register aer resume notification handler for aer resume
  vfio: add 'aer' property to expose aercap

 hw/pci/pci.c               |  32 ++
 hw/vfio/pci.c              | 826 +++++++++++++++++++++++++++++++++++++++++----
 hw/vfio/pci.h              |  10 +
 include/hw/pci/pci.h       |   1 +
 linux-headers/linux/vfio.h |   1 +
 5 files changed, 804 insertions(+), 66 deletions(-)

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1.8.3.1