linux-kernel - [PATCH 0/4] x86/x86: KVM: Fixes for KVM's PI wakeup handler

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Date:   Fri,  8 Oct 2021 17:11:03 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, Paolo Bonzini <pbonzini@...hat.com>
Cc:     "H. Peter Anvin" <hpa@...or.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Subject: [PATCH 0/4] x86/x86: KVM: Fixes for KVM's PI wakeup handler

Two fixes and two cleanups related to KVM's posted interrupt wakeup
handler.  Fix #1 ensures any in-flight IRQs finish after changing the
handler.  Fix #2 actually uninstalls KVM's handler so that a spurious IRQ
won't jump into a freed module.

AFAIK, no one has actually hit these bugs as it would require a really
spurious IRQ, or a bug+race elsehwere that caused a device to post an
interrupt well after a KVM guest is torn down.

Sean Christopherson (4):
  x86/irq: Ensure PI wakeup handler is unregistered before module unload
  KVM: VMX: Unregister posted interrupt wakeup handler on hardware
    unsetup
  x86/irq: KVM: Harden posted interrupt (un)registration paths
  KVM: VMX: Register posted interrupt wakeup handler iff APICv is
    enabled

 arch/x86/include/asm/irq.h |  3 ++-
 arch/x86/kernel/irq.c      | 30 +++++++++++++++++++++---------
 arch/x86/kvm/vmx/vmx.c     |  9 +++++++--
 3 files changed, 30 insertions(+), 12 deletions(-)

-- 
2.33.0.882.g93a45727a2-goog