linux-kernel - Re: [PATCH 1/9] KVM: SVM: Notify nested hypervisor of lost event injections

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Message-ID: <4ACE127A.6040304@redhat.com>
Date:	Thu, 08 Oct 2009 18:25:30 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Joerg Roedel <joerg.roedel@....com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	Alexander Graf <agraf@...e.de>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/9] KVM: SVM: Notify nested hypervisor of lost event
 injections

On 10/08/2009 06:22 PM, Joerg Roedel wrote:
> On Thu, Oct 08, 2009 at 06:12:28PM +0200, Avi Kivity wrote:
>    
>> On 10/08/2009 12:03 PM, Joerg Roedel wrote:
>>      
>>> From: Alexander Graf<agraf@...e.de>
>>>
>>> If event_inj is valid on a #vmexit the host CPU would write
>>> the contents to exit_int_info, so the hypervisor knows that
>>> the event wasn't injected.
>>>
>>> We don't do this in nested SVM by now which is a bug and
>>> fixed by this patch.
>>>        
>> We need to start thinking about regression tests for these bugs.  It
>> would be relatively easy to set up something with save->cr3 == cr3
>> (i.e. no isolation, mmu virtualization, etc.).
>>      
> Should be doable with a in-kernel regression test-suite module, I think.
> Triggering such (race-condition like) test cases from userspace is
> somewhat hard.
>
>    

Isn't it sufficient, for this case, to inject a nested interrupt when 
the nested idt is not mapped?

-- 
error compiling committee.c: too many arguments to function

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