linux-kernel - Re: [PATCH v2 0/6] KVM: x86: cleanup and speedup for APICv

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Message-ID: <17f03111-627d-861e-49b6-c7cc081eadeb@redhat.com>
Date:   Wed, 8 Feb 2017 16:01:06 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Radim Krčmář <rkrcmar@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH v2 0/6] KVM: x86: cleanup and speedup for APICv



On 08/02/2017 14:33, Radim Krčmář wrote:
> 2017-02-08 11:04+0100, Paolo Bonzini:
>> On 07/02/2017 22:52, Radim Krčmář wrote:
>>> there might be some rough
>>> edges with nested, but it was broken even before, and they fix at least
>>> one known bug.
>>
>> I don't think so, nested IRQ injection is tested very well.  Why do you
>> say it was broken even before?
> 
> I was basing on recent bug report where we missed IOMMU injection in a
> non-nested case [1].  While we do cover the non-nested case with this
> series, I think we still miss posted interrupts from IOMMU that should
> trigger a nested VM exit from L2 to L1 -- details in review of [6/6].
> 
> 1: http://www.spinics.net/lists/kvm/msg144355.html

Uh, nice.  Totally missed that.

Paolo