Re: [Xen-devel] xen interrupt

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Sun, 2013-03-17 at 13:18 +0000, zhangwqh wrote:
> Hi, all
> 
> These days I read the source code about xen interrupts. When physical
> interrupts arrive, in xen source code, do_IRQ will decide which will deal
> with the physical interrupt, by xen or the guest os. If the physical
> interrupt should be dealt with by guest os. Then the case __do_irq_guest()
> will be executed. In __do_irq_guest() function, the corresponding event
> channel will be delivered to the guests that are registered the irq. My
> question is that in the guest os, how to decide whether the irq is to
> itself? Eg, a guest A request a file from a disk, after the disk finished to
> get the file, will generate a disk interrupt. The disk interrupt should only
> be delivered to the guest A. Maybe all of the guest virtual machines
> registered the  disk interrupt. __do_irq_guest will deliver the disk
> interrupt to all of the virtual machines. In the virtual machine, how to
> decide the disk interrupt was generated by its requested file? 

Even channels are per domain, so if a guest receives one then it knows
inherently that it is for itself.

There is no concept of multiple VMs being registered to receive a single
interrupt.

Ian.


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