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

[Zeng Guang]

On 5/3/2022 12:16 AM, Paolo Bonzini wrote:
> On 4/19/22 17:45, Zeng Guang wrote:
> > +static bool vmx_can_use_pi_wakeup(struct kvm_vcpu *vcpu)
> > +{
> > +	/*
> > +	 * If a blocked vCPU can be the target of posted interrupts,
> > +	 * switching notification vector is needed so that kernel can
> > +	 * be informed when an interrupt is posted and get the chance
> > +	 * to wake up the blocked vCPU. For now, using posted interrupt
> > +	 * for vCPU wakeup when IPI virtualization or VT-d PI can be
> > +	 * enabled.
> > +	 */
> > +	return vmx_can_use_ipiv(vcpu) || vmx_can_use_vtd_pi(vcpu->kvm);
> > +}
> Slightly more accurate name and comment:
>
> static bool vmx_needs_pi_wakeup(struct kvm_vcpu *vcpu)
> {
>           /*
>            * The default posted interrupt vector does nothing when
>            * invoked outside guest mode.   Return whether a blocked vCPU
>            * can be the target of posted interrupts, as is the case when
>            * using either IPI virtualization or VT-d PI, so that the
>            * notification vector is switched to the one that calls
>            * back to the pi_wakeup_handler() function.
>            */
>           return vmx_can_use_ipiv(vcpu) || vmx_can_use_vtd_pi(vcpu->kvm);
> }
>
>
> Paolo
Thanks. It's much accurate and better to describe the functionality of 
this API.
I will change it.