Re: [Xen-devel] [VTD][PATCH] Fix ISA IRQ alias issue

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

So what if a PCI-ISA IRQ is delivered via, and EOIed via, the IO-APIC?

 -- Keir

On 17/11/07 01:37, "Han, Weidong" <weidong.han@xxxxxxxxx> wrote:

> This patch doesn't change EOI of PCI-ISA IRQs via IO-APIC, it just uses
> a separate function to handle EOI of PCI-ISA IRQs via the PIC. Without
> this patch, assigning multiple devices to guest which uses PIC maybe
> results in disabling the IRQ.
> 
> -- Weidong
> 
> Keir Fraser wrote:
>> A concerning amount of code churn and I'm not clear it works for EOI
>> of PCI-ISA IRQs via the IO-APIC. This probably isn't for 3.2.0.
>> 
>>  -- Keir
>> 
>> On 15/11/07 06:32, "Han, Weidong" <weidong.han@xxxxxxxxx> wrote:
>> 
>>> When assign multiple devices to guest which uses PIC, ISA IRQ alias
>>> may occur. This patch splits ISA IRQ and GSI eoi function. In ISA
>>> IRQ eoi function, searches all assigned mirqs and does eoi for the
>>> corresponding mirqs which match the eoi ISA IRQ. Therefore fix ISA
>>> IRQ alias issue.
>>> 
>>> 
>>> Signed-off-by: Weidong Han <weidong.han@xxxxxxxxx>
>>> _______________________________________________
>>> Xen-devel mailing list
>>> Xen-devel@xxxxxxxxxxxxxxxxxxx
>>> http://lists.xensource.com/xen-devel
>> 
>> 
>> 
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@xxxxxxxxxxxxxxxxxxx
>> http://lists.xensource.com/xen-devel



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