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Re: [Xen-devel] [PATCH RFC V4 5/5] Documentation/kvm : Add documentation on Hypercalls and features used for PV spinlock

* Gleb Natapov <gleb@xxxxxxxxxx> [2012-01-17 11:14:13]:

> > The problem case I was thinking of was when guest VCPU would have issued
> > HLT with interrupts disabled. I guess one option is to inject an NMI,
> > and have the guest kernel NMI handler recognize this and make
> > adjustments such that the vcpu avoids going back to HLT instruction.
> > 
> Just kick vcpu out of a guest mode and adjust rip to point after HLT on
> next re-entry. Don't forget to call vmx_clear_hlt().

Looks bit hackish to me compared to having another hypercall to yield!

> > Having another hypercall to do yield/sleep (rather than effecting that
> > via HLT) seems like an alternate clean solution here ..

- vatsa

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