Re: [PATCH 0/2] KVM: x86: Revert to fix apic_hw_disabled underflow

[Paolo Bonzini]

On 13/10/21 02:35, Sean Christopherson wrote:
> 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
>      vCPU RESET"
>    KVM: x86: WARN if APIC HW/SW disable static keys are non-zero on
>      unload
>
>   arch/x86/kvm/lapic.c | 20 +++++++++++++-------
>   1 file changed, 13 insertions(+), 7 deletions(-)

Queued for 5.15, thanks.

Paolo