linux-kernel - Re: [PATCH 0/6] KVM: nVMX: Fix IPIv vs. nested posted interrupts

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Message-ID: <172506347147.337933.13850159673543308459.b4-ty@google.com>
Date: Fri, 30 Aug 2024 17:21:09 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Chao Gao <chao.gao@...el.com>, Zeng Guang <guang.zeng@...el.com>
Subject: Re: [PATCH 0/6] KVM: nVMX: Fix IPIv vs. nested posted interrupts

On Fri, 19 Jul 2024 17:01:32 -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, I'm 99.9% certain the issue is
> limited to IPI virtualization being enabled.
> 
> Found by the nested posted interrupt KUT test on SPR.
> 
> [...]

Applied to kvm-x86 vmx, with a massaged changelog to clarify that this bug could
be hit even without IPI virtualization.

[1/6] KVM: nVMX: Get to-be-acknowledge IRQ for nested VM-Exit at injection site
      https://github.com/kvm-x86/linux/commit/6f373f4d941b
[2/6] KVM: nVMX: Suppress external interrupt VM-Exit injection if there's no IRQ
      https://github.com/kvm-x86/linux/commit/cb14e454add0
[3/6] KVM: x86: Don't move VMX's nested PI notification vector from IRR to ISR
      https://github.com/kvm-x86/linux/commit/f729851189d5
[4/6] KVM: nVMX: Track nested_vmx.posted_intr_nv as a signed int
      https://github.com/kvm-x86/linux/commit/ab9cbe044f83
[5/6] KVM: nVMX: Explicitly invalidate posted_intr_nv if PI is disabled at VM-Enter
      https://github.com/kvm-x86/linux/commit/be02aa1e52d2
[6/6] KVM: nVMX: Detect nested posted interrupt NV at nested VM-Exit injection
      https://github.com/kvm-x86/linux/commit/44518120c4ca

--
https://github.com/kvm-x86/linux/tree/next