linux-kernel - Re: [PATCH v2 0/7] KVM: nVMX: Fix IPIv vs. nested posted interrupts

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Message-ID: <20240910162238.GB117481@thelio-3990X>
Date: Tue, 10 Sep 2024 09:22:38 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, Chao Gao <chao.gao@...el.com>,
	Zeng Guang <guang.zeng@...el.com>
Subject: Re: [PATCH v2 0/7] KVM: nVMX: Fix IPIv vs. nested posted interrupts

On Mon, Sep 09, 2024 at 09:56:42PM -0700, Sean Christopherson wrote:
> On Thu, 05 Sep 2024 21:34:06 -0700, Sean Christopherson wrote:
> > Fix a bug where KVM injects L2's nested posted interrupt into L1 as a
> > nested VM-Exit instead of triggering PI processing.  The actual bug is
> > technically a generic nested posted interrupts problem, but due to the
> > way that KVM handles interrupt delivery, the issue is mostly limited to
> > to IPI virtualization being enabled.
> > 
> > Found by the nested posted interrupt KUT test on SPR.
> > 
> > [...]
> 
> Trying this again, hopefully with less awful testing this time...

I meant to reply yesterday but I guess I lost track of time. This passed
my testing on all my machines, so it is not as bad as last time :)

Cheers,
Nathan