Re: [v3 21/26] x86, irq: Define a global vector for VT-d Posted-Interrupts

From: Marcelo Tosatti
Date: Mon Feb 23 2015 - 17:06:00 EST

On Fri, Dec 12, 2014 at 11:14:55PM +0800, Feng Wu wrote:
> Currently, we use a global vector as the Posted-Interrupts
> Notification Event for all the vCPUs in the system. We need
> to introduce another global vector for VT-d Posted-Interrtups,
> which will be used to wakeup the sleep vCPU when an external
> interrupt from a direct-assigned device happens for that vCPU.
> Signed-off-by: Feng Wu <feng.wu@xxxxxxxxx>

Why an additional vector is necessary?

Can't you simply wakeup the vcpu from kvm_posted_intr_ipi, the posted
interrupt vector handler ?

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