RE: [Xen-devel] [VTD][PATCH] interrupt remapping patch for xen 3.3

["Kay, Allen M" <allen.m.kay@xxxxxxxxx>]

Interrupt remapping redirects ioapic/msi interrupt entries to interrupt
remap table.  SID field in the Interrupt Remapping Table Entry qualifies
the interrupt with BDF information of the ioapic/MSI devices.

Therefore the main value it adds for current Xen VT-d/PCI passthru is
that it protects hypervisor interrupts from malicious attacks from
guests with passthru devices.  Other benefits it can provide is easier
IRQ rebalancing and extended APIC ID support.

Allen

>-----Original Message-----
>From: Keir Fraser [mailto:Keir.Fraser@xxxxxxxxxxxx] 
>Sent: Thursday, January 24, 2008 12:14 AM
>To: Kay, Allen M; xen-devel@xxxxxxxxxxxxxxxxxxx
>Cc: Han, Weidong
>Subject: Re: [Xen-devel] [VTD][PATCH] interrupt remapping 
>patch for xen 3.3
>
>What exactly does irq remapping mean, and what are its benefits in the
>current Xen VT-D architecture? It's really not at all clear 
>what's going on
>from the current VT-D documentation.
>
>Since all interrupts get abstracted through Xen right now, if 
>it's just an
>interrupt-line remapping then that doesn't seem very useful...
>
> -- Keir
>
>On 24/1/08 02:33, "Kay, Allen M" <allen.m.kay@xxxxxxxxx> wrote:
>
>> Attached patch remaps interrupt for passthru device if such HW is
>> detected on VT-d platforms.
>> 
>> Signed-off-by: Allen Kay <allen.m.kay@xxxxxxxxx>
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@xxxxxxxxxxxxxxxxxxx
>> http://lists.xensource.com/xen-devel
>
>
>

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