[v5,0/3] KVM: x86: Optimize "stale" EOI bitmap exiting

Message

Sean Christopherson March 4, 2025, 1:33 a.m. UTC

Slightly modified version of the patch (now mini-series) to optimize EOI
bitmap exiting for "stale" routes, i.e. for the case where a vCPU has an
in-flight IRQ when the routing changes, and needs one final EOI exit to
deassert the IRQ.

Kai, I dropped your Reviewed-by as the change was non-trivial.

v5:
 - Intercept EOI if and only if the IRQ is level-triggered.
 - Add helper to consolidate logic.
 - Tweak field name.
 - "Reset" field to -1, immediately before scanning routes.

v4: https://lore.kernel.org/all/[e-mail]

Sean Christopherson (2):
  KVM: x86: Isolate edge vs. level check in userspace I/O APIC route
    scanning
  KVM: x86: Add a helper to deduplicate I/O APIC EOI interception logic

weizijie (1):
  KVM: x86: Rescan I/O APIC routes after EOI interception for old
    routing

 arch/x86/include/asm/kvm_host.h |  1 +
 arch/x86/kvm/ioapic.c           |  7 ++-----
 arch/x86/kvm/ioapic.h           |  2 ++
 arch/x86/kvm/irq_comm.c         | 37 ++++++++++++++++++++++++++++-----
 arch/x86/kvm/lapic.c            |  8 +++++++
 arch/x86/kvm/x86.c              |  1 +
 6 files changed, 46 insertions(+), 10 deletions(-)


base-commit: ead22377189e55ba0e9b637a8f48578cf84f5b9c