linux-kernel - [PATCH v5 0/3] KVM: x86: Optimize "stale" EOI bitmap exiting

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Message-ID: <20250304013335.4155703-1-seanjc@google.com>
Date: Mon,  3 Mar 2025 17:33:32 -0800
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Kai Huang <kai.huang@...el.com>, xuyun <xuyun_xy.xy@...ux.alibaba.com>, 
	weizijie <zijie.wei@...ux.alibaba.com>
Subject: [PATCH v5 0/3] KVM: x86: Optimize "stale" EOI bitmap exiting

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/20250303052227.523411-1-zijie.wei@linux.alibaba.com

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
-- 
2.48.1.711.g2feabab25a-goog