From: Ingo Molnar <mingo@kernel.org>
To: Gleb Natapov <gleb@redhat.com>
Cc: Yang Zhang <yang.z.zhang@intel.com>,
kvm@vger.kernel.org, mtosatti@redhat.com,
xiantao.zhang@intel.com, hpa@linux.intel.com
Subject: Re: [PATCH v5 2/5] KVM: VMX: Register a new IPI for posted interrupt
Date: Fri, 8 Mar 2013 15:05:45 +0100 [thread overview]
Message-ID: <20130308140545.GA28860@gmail.com> (raw)
In-Reply-To: <20130308134719.GH24444@redhat.com>
* Gleb Natapov <gleb@redhat.com> wrote:
> On Fri, Mar 08, 2013 at 02:26:25PM +0100, Ingo Molnar wrote:
> >
> > * Yang Zhang <yang.z.zhang@intel.com> 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.
But received on the guest side, right?
Thanks,
Ingo
next prev parent reply other threads:[~2013-03-08 14:05 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-08 1:23 [PATCH v5 0/5] KVM: VMX: Add Posted Interrupt supporting Yang Zhang
2013-03-08 1:23 ` [PATCH v5 1/5] KVM: VMX: Enable acknowledge interupt on vmexit Yang Zhang
2013-03-08 1:23 ` [PATCH v5 2/5] KVM: VMX: Register a new IPI for posted interrupt Yang Zhang
2013-03-08 13:26 ` Ingo Molnar
2013-03-08 13:47 ` Gleb Natapov
2013-03-08 14:05 ` Ingo Molnar [this message]
2013-03-08 14:07 ` Zhang, Yang Z
2013-03-08 14:21 ` Gleb Natapov
2013-03-08 15:40 ` Ingo Molnar
2013-03-15 2:41 ` Zhang, Yang Z
2013-03-08 1:23 ` [PATCH v5 3/5] KVM: VMX: Check the posted interrupt capability Yang Zhang
2013-03-08 1:23 ` [PATCH v5 4/5] KVM: VMX: Add the algorithm of deliver posted interrupt Yang Zhang
2013-03-08 20:21 ` Marcelo Tosatti
2013-03-09 1:19 ` Zhang, Yang Z
2013-03-08 1:23 ` [PATCH v5 5/5] KVM : VMX: Use posted interrupt to deliver virtual interrupt Yang Zhang
2013-03-08 20:23 ` Marcelo Tosatti
2013-03-09 1:19 ` Zhang, Yang Z
2013-03-11 13:04 ` Gleb Natapov
2013-03-11 13:38 ` Zhang, Yang Z
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