[Qemu-commits] [qemu/qemu] c048be: vfio: Fix MSI-X vector expansion

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/qemu/qemu
  Commit: c048be5cc92ae201c339d46984476c4629275ed6
      
https://github.com/qemu/qemu/commit/c048be5cc92ae201c339d46984476c4629275ed6
  Author: Alex Williamson <address@hidden>
  Date:   2014-08-05 (Tue, 05 Aug 2014)

  Changed paths:
    M hw/misc/vfio.c

  Log Message:
  -----------
  vfio: Fix MSI-X vector expansion

When new MSI-X vectors are enabled we need to disable MSI-X and
re-enable it with the correct number of vectors.  That means we need
to reprogram the eventfd triggers for each vector.  Prior to f4d45d47
vector->use tracked whether a vector was masked or unmasked and we
could always pick the KVM path when available for unmasked vectors.
Now vfio doesn't track mask state itself and vector->use and virq
remains configured even for masked vectors.  Therefore we need to ask
the MSI-X code whether a vector is masked in order to select the
correct signaling path.  As noted in the comment, MSI relies on
hardware to handle masking.

Signed-off-by: Alex Williamson <address@hidden>
Cc: address@hidden # QEMU 2.1


  Commit: 9b3af4c0e40f14b5173ad6e2d9fcc376207ec1dd
      
https://github.com/qemu/qemu/commit/9b3af4c0e40f14b5173ad6e2d9fcc376207ec1dd
  Author: Alex Williamson <address@hidden>
  Date:   2014-08-05 (Tue, 05 Aug 2014)

  Changed paths:
    M hw/misc/vfio.c

  Log Message:
  -----------
  vfio: Don't cache MSIMessage

Commit 40509f7f added a test to avoid updating KVM MSI routes when the
MSIMessage is unchanged and f4d45d47 switched to relying on this
rather than doing our own comparison.  Our cached msg is effectively
unused now.  Remove it.

Signed-off-by: Alex Williamson <address@hidden>


  Commit: 9d8bb3557408adc3e5e26b7915cbf6c198dfd4ff
      
https://github.com/qemu/qemu/commit/9d8bb3557408adc3e5e26b7915cbf6c198dfd4ff
  Author: Peter Maydell <address@hidden>
  Date:   2014-08-07 (Thu, 07 Aug 2014)

  Changed paths:
    M hw/misc/vfio.c

  Log Message:
  -----------
  Merge remote-tracking branch 
'remotes/awilliam/tags/vfio-pci-for-qemu-20140805.0' into staging

VFIO patches: Fix MSI-X vector expansion, remove MSI/X message caching

# gpg: Signature made Tue 05 Aug 2014 20:25:57 BST using RSA key ID 3BB08B22
# gpg: Can't check signature: public key not found

* remotes/awilliam/tags/vfio-pci-for-qemu-20140805.0:
  vfio: Don't cache MSIMessage
  vfio: Fix MSI-X vector expansion

Signed-off-by: Peter Maydell <address@hidden>


Compare: https://github.com/qemu/qemu/compare/69f87f713069...9d8bb3557408