Re: [PATCH v3 15/16] kvm: x86: ioapic: Lazy update IOAPIC EOI

[Paolo Bonzini]

On 31/10/19 16:17, Suthikulpanit, Suravee wrote:
> What if we change kvm->arch.apicv_state to kvm->arch.apicv_disable_mask 
> and have each bit representing the reason for deactivating APICv.
> 
> For example:
>      #define APICV_DISABLE_MASK_IRQWIN        0
>      #define APICV_DISABLE_MASK_HYPERV        1
>      #define APICV_DISABLE_MASK_PIT_REINJ     2
>      #define APICV_DISABLE_MASK_NESTED        3
> 
> In this case, we activate APICv only if kvm->arch.apicv_disable_mask == 
> 0. This way, we can find out why APICv is deactivated on a particular VM 
> at a particular point in time.

Yes, that also works for me if it makes for an easier implementation.

Paolo