linux-kernel - Re: [PATCH] KVM: nVMX: Update VMCS12_REVISION comment to state it should never change

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Message-ID: <171961396745.229913.4199964283603115354.b4-ty@google.com>
Date: Fri, 28 Jun 2024 15:55:40 -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, 
	Jim Mattson <jmattson@...gle.com>
Subject: Re: [PATCH] KVM: nVMX: Update VMCS12_REVISION comment to state it
 should never change

On Thu, 13 Jun 2024 12:01:03 -0700, Sean Christopherson wrote:
> Rewrite the comment above VMCS12_REVISION to unequivocally state that the
> ID must never change.  KVM_{G,S}ET_NESTED_STATE have been officially
> supported for some time now, i.e. changing VMCS12_REVISION would break
> userspace.
> 
> Opportunistically add a blurb to the CHECK_OFFSET() comment to make it
> explicitly clear that new fields are allowed, i.e. that the restriction
> on the layout is all about backwards compatibility.
> 
> [...]

Applied to kvm-x86 vmx, thanks!

[1/1] KVM: nVMX: Update VMCS12_REVISION comment to state it should never change
      https://github.com/kvm-x86/linux/commit/cb9fb5fc12ef

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