Re: [External] [PATCH v9 9/9] KVM: VMX: enable IPI virtualization

[Chao Gao]

On Mon, Jun 20, 2022 at 06:02:32PM +0800, Shenming Lu wrote:
>> +		if (enable_ipiv)
>> +			tertiary_exec_controls_clearbit(vmx, TERTIARY_EXEC_IPI_VIRT);
>> +	}
>>   	vmx_update_msr_bitmap_x2apic(vcpu);
>>   }
>
>Hi, just a small question here:
>
>It seems that we clear the TERTIARY_EXEC_IPI_VIRT bit before enabling
>interception for APIC_ICR when deactivating APICv on some reason.
>Is there any problem with this sequence?

Both are done before the next vCPU entry. As long as no guest code can
run between them (APICv setting takes effect in guest), this sequence
shouldn't have any problem.