Re: [PATCH 2/2] KVM: x86: fix edge EOI and IOAPIC reconfig race

[Paolo Bonzini]

On 13/08/2015 15:46, Radim KrÄmÃÅ wrote:
> +	if (kvm_x86_ops->sync_pir_to_irr(vcpu))
> +		kvm_make_request(KVM_REQ_EVENT, vcpu);
> +

The call to sync_pir_to_irr belongs more in vcpu_scan_ioapic, I think.

More importantly, I think that KVM_REQ_EVENT is a latent bug for
kvm_vcpu_ioctl_get_lapic as well, so the call to kvm_make_request should
go in vmx_sync_pir_to_irr or in a new kvm_sync_pir_to_irr wrapper.

> +			    (e->fields.trig_mode == IOAPIC_EDGE_TRIG &&
> +			     kvm_apic_pending_eoi(vcpu, e->fields.vector)))

Should we test again here that kvm_irq_has_notifier(ioapic->kvm,
KVM_IRQCHIP_IOAPIC, index), to avoid unnecessarily marking other
edge-triggered interrupts?

Paolo
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