[PATCH 0/3] KVM: Speed up MMIO registrations

[Keir Fraser]

This series improves performance of MMIO registrations, which occur
multiple times when booting a typical VM. The existing call to
synchronize_srcu() may block for a considerable time: In our tests
it was found to account for approximately 25% of a VM's startup time.

arm64 vgic code is cleaned up and made responsible for
its own setup synchronization, and the MMIO registration logic
replaces synchronize_srcu() with a deferred callback to free the old
io_bus struct.

Keir Fraser (3):
  KVM: arm64: vgic-init: Remove vgic_ready() macro
  KVM: arm64: vgic: Explicitly implement vgic_dist::ready ordering
  KVM: Avoid synchronize_srcu() in kvm_io_bus_register_dev()

 arch/arm64/kvm/vgic/vgic-init.c | 14 +++-----------
 include/kvm/arm_vgic.h          |  1 -
 include/linux/kvm_host.h        |  1 +
 virt/kvm/kvm_main.c             | 10 ++++++++--
 4 files changed, 12 insertions(+), 14 deletions(-)

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2.50.0.rc2.761.g2dc52ea45b-goog