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Re: [Xen-devel] permit_access functionality

To: Jayant Mangalampalli <Jayant_Mangalampalli@xxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] permit_access functionality
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: Fri, 28 Sep 2007 18:53:57 +0100
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No, those functions are (currently) only for allowing I/O access for PV
guests. The recent VT-d patches provide direct I/O functionality for HVM
guests, if you have capable hardware.

 -- Keir

On 28/9/07 18:49, "Jayant Mangalampalli" <Jayant_Mangalampalli@xxxxxxxxxxx>

> What is the exact use of ioport_permit_access() and irq_permit_access() kind
> of functions? If I permit port/irq access to HVM guest for a particular port
> or IRQ, does that mean guest VCPU does not issue a hypercall when accessing
> them? If a PIRQ is asserted by physical hardware, can hvm guest directly get
> notification if given such access?
> Thanks
> Jayant
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