Re: [PATCH v2] KVM: x86/mmu: Check every prev_roots in __kvm_mmu_free_obsolete_roots()

[Sean Christopherson]

On Mon, Jun 06, 2022, shaoqin.huang@xxxxxxxxx wrote:
> From: Shaoqin Huang <shaoqin.huang@xxxxxxxxx>
> 
> When freeing obsolete previous roots, check prev_roots as intended, not
> the current root.
> 
> Signed-off-by: Shaoqin Huang <shaoqin.huang@xxxxxxxxx>
> Fixes: 527d5cd7eece ("KVM: x86/mmu: Zap only obsolete roots if a root shadow page is zapped")

Because KVM patches aren't guaranteed to be backported without it (though it's
"only" v5.18 that's affected), this needs:

  Cc: stable@xxxxxxxxxxxxxxx 

Reviewed-by: Sean Christopherson <seanjc@xxxxxxxxxx>