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Date:   Tue, 12 Oct 2021 17:35:52 -0700
From:   Sean Christopherson <>
To:     Paolo Bonzini <>
Cc:     Sean Christopherson <>,
        Vitaly Kuznetsov <>,
        Wanpeng Li <>,
        Jim Mattson <>,
        Joerg Roedel <>,,,,
        Tetsuo Handa <>
Subject: [PATCH 0/2] KVM: x86: Revert to fix apic_hw_disabled underflow

Revert (mostly) a patch from the vCPU RESET cleanup that open coded some
APIC shenanigans to avoid stuffing vcpu->arch.apic_base at vCPU creation,
and completely overlooked the side effects on apic_hw_disabled.  I went
for a revert as I think the original behavior is the least awful solution,
just somewhat poorly documented.

The second patch adds WARNs to detect "overflow", where "overflow" means
KVM incorrectly increments apic_hw_disabled.

Sean Christopherson (2):
  Revert "KVM: x86: Open code necessary bits of kvm_lapic_set_base() at
  KVM: x86: WARN if APIC HW/SW disable static keys are non-zero on

 arch/x86/kvm/lapic.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)


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