In vfio migration resume phase, the cost would increase if the
vfio device has more unmasked vectors. We try to optimize it in
this series.
Patch 1 & 2 are simple code cleanups.
Patch 3 defers to set irqs to vfio core.
Patch 4 & 5 defer to commit the route to KVM core.
The test VM has 128 vcpus and 8 VF (with 65 vectors enabled),
we mesure the cost of the vfio_msix_enable for each one, and
we can see the total cost can be significantly reduced.
Origin Apply Patch 3 Apply Patch 3/4/5
1st 8 4 2
2nd 15 11 2
3rd 22 18 2
4th 24 25 3
5th 36 33 2
6th 44 40 3
7th 51 47 3
8th 58 54 4
Total 258ms 232ms 21ms
Longpeng (Mike) (5):
vfio: use helper to simplfy the failure path in vfio_msi_enable
msix: simplfy the conditional in msix_set/unset_vector_notifiers
vfio: defer to enable msix in migration resume phase
kvm: irqchip: support defer to commit the route
vfio: defer to commit kvm route in migraiton resume phase
accel/kvm/kvm-all.c | 10 +++--
accel/stubs/kvm-stub.c | 3 +-
hw/misc/ivshmem.c | 2 +-
hw/pci/msix.c | 7 ++--
hw/vfio/pci.c | 99 ++++++++++++++++++++++++++++++++++++++------------
hw/vfio/pci.h | 1 +
hw/virtio/virtio-pci.c | 2 +-
include/sysemu/kvm.h | 4 +-
target/i386/kvm/kvm.c | 2 +-
9 files changed, 95 insertions(+), 35 deletions(-)
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1.8.3.1
