[Xen-devel] RE: FW: about VIRQ & PIRQ

["Petersson, Mats" <Mats.Petersson@xxxxxxx>]

> -----Original Message-----
> From: Koripella Srinivas [mailto:talkwithsrinivas@xxxxxxxxxxx] 
> Sent: 07 June 2007 03:46
> To: xen-devel@xxxxxxxxxxxxxxxxxxx; Petersson, Mats; pradeep 
> singh rautela"; Mark Williamson
> Subject: Re: FW: about VIRQ & PIRQ
> 
> Hi,
> >To understand better, have a look at .../xen/arch/x86/irq.c, and in
> >particular the function __do_IRQ_guest(). 
> 
> But do hvm guests use event channels as used in 
> /xen/arch/x86/irq.c. My thinking was they use emulated pic/apic.

That is correct - the HVM guests use a different principle - although
there's still an event-channel for the QEMU to signal to the hypervisor
that there's an interrupt pending so that the hypervisor will "look" at
the emulated pic/apic. 

--
Mats



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