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

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Date:   Wed, 8 Feb 2017 14:33:44 +0100
From:   Radim Krčmář <rkrcmar@...hat.com>
To:     Paolo Bonzini <pbonzini@...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

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