[PATCH 1/7] KVM: x86: Free vCPUs before freeing VM state

[Sean Christopherson]

On Wed, Feb 26, 2025, Paolo Bonzini wrote:
> On 2/25/25 00:55, Sean Christopherson wrote:
> > Free vCPUs before freeing any VM state, as both SVM and VMX may access
> > VM state when "freeing" a vCPU that is currently "in" L2, i.e. that needs
> > to be kicked out of nested guest mode.
> > 
> > Commit 6fcee03df6a1 ("KVM: x86: avoid loading a vCPU after .vm_destroy was
> > called") partially fixed the issue, but for unknown reasons only moved the
> > MMU unloading before VM destruction.  Complete the change, and free all
> > vCPU state prior to destroying VM state, as nVMX accesses even more state
> > than nSVM.
> 
> I applied this to kvm-coco-queue, I will place it in kvm/master too unless
> you shout.

Depends on what "this" is :-)

My plan/hope is to land patches 1 and 2 in 6.14, i.e. in kvm/master, but the
rest are firmly 6.15 IMO.  And based on Yan's feedback, I'm planning on adding a
few more cleanups (though I think they're fully additive, i.e. can go on top).