On Fri, Mar 08, 2013 at 02:26:25PM +0100, Ingo Molnar wrote:
>
> * Yang Zhang <[email protected]> wrote:
>
> > diff --git a/arch/x86/kernel/irqinit.c b/arch/x86/kernel/irqinit.c
> > index 6e03b0d..2329a54 100644
> > --- a/arch/x86/kernel/irqinit.c
> > +++ b/arch/x86/kernel/irqinit.c
> > @@ -205,6 +205,10 @@ static void __init apic_intr_init(void)
> >
> > /* IPI for X86 platform specific use */
> > alloc_intr_gate(X86_PLATFORM_IPI_VECTOR, x86_platform_ipi);
> > +#ifdef CONFIG_HAVE_KVM
> > + /* IPI for KVM to deliver posted interrupt */
> > + alloc_intr_gate(POSTED_INTR_VECTOR, kvm_posted_intr_ipi);
> > +#endif
>
> Please avoid wasting an IDT entry by reusing x86_platform_ipi.
>
> A KVM guest is in essence one type of 'x86 platform', and this callback is
> used by
> hardware platforms, so collision is not an issue AFAICS.
>
This is IPI send by a host though.
--
Gleb.
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