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Re: [Xen-devel] [PATCH 0/4] Add posted interrupt supporting

>>> On 19.04.13 at 13:49, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> 
>>> wrote:
> I am also interested in this question and I cannot find a clear answer:
> when a guest vcpu wants to issue an IPI to another vcpu, will it trap
> into Xen? Or will everything work automagically?

For PV, obviously, this is done by a hypercall.

For HVM this ought to depend on the level of hardware assistance
in LAPIC virtualization: Traditionally, the involved LAPIC register
accesses would trap into the hypervisor. But with full APIC
virtualization, this should not be happening anymore.


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