Re: [PATCH v2 37/43] KVM: SVM: Unconditionally mark AVIC as running on vCPU load (with APICv)

[Sean Christopherson]

On Mon, Oct 25, 2021, Paolo Bonzini wrote:
> On 25/10/21 17:48, Sean Christopherson wrote:
> > On Mon, Oct 25, 2021, Paolo Bonzini wrote:
> > > On 09/10/21 04:12, Sean Christopherson wrote:
> > > > +	/* TODO: Document why the unblocking path checks for updates. */
> > > 
> > > Is that a riddle or what? :)
> > 
> > Yes?  I haven't been able to figure out why the unblocking path explicitly
> > checks and handles an APICv update.
> > 
> 
> Challenge accepted.  In the original code, it was because without it
> avic_vcpu_load would do nothing, and nothing would update the IS_RUNNING
> flag.
> 
> It shouldn't be necessary anymore since commit df7e4827c549 ("KVM: SVM: call
> avic_vcpu_load/avic_vcpu_put when enabling/disabling AVIC", 2021-08-20),
> where svm_refresh_apicv_exec_ctrl takes care of the avic_vcpu_load on the
> next VMRUN.

Aha!  Thanks, I'll work in a removal for the next version.