linux-kernel - Re: [PATCH v3] enable x2APIC without interrupt remapping under KVM

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Message-ID: <4A4A476C.2070305@redhat.com>
Date:	Tue, 30 Jun 2009 20:12:12 +0300
From:	Avi Kivity <avi@...hat.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Gleb Natapov <gleb@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Sheng Yang <sheng@...ux.intel.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>
Subject: Re: [PATCH v3] enable x2APIC without interrupt remapping under KVM

On 06/30/2009 07:44 PM, Eric W. Biederman wrote:
>>> To support that seriously you need interrupt remapping.
>>>
>>>        
>> Can you explain why?
>>      
>
> Because ioapics don't fully function according to spec,
> and the interrupt code on the hotplug path is a horrible
> terrible broken hack for ioapics.
>
> It is better than nothing but it certainly is not something
> I would expect to work all of the time.
>    

Can you elaborate?  For kvm guests, the hardware is reasonably will 
implemented and if not we will fix it.  We need not cripple a feature 
just because some hardware is broken.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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