Re: [PATCH v3 09/10] KVM: MMU: fix MTRR update

From: Paolo Bonzini
Date: Thu May 14 2015 - 04:44:03 EST

On 14/05/2015 02:16, Wanpeng Li wrote:
> >SPTEs are kept around and cached. The "role" field is used as the hash
> >key; if the role doesn't change, SPTEs are reused, so you have to zap
> >the SPTEs explicitly.
> Btw, why the patch changelog mentioned that the root shadow page will be
> reused, I think it will be zapped in mmu_free_roots.

Who has set sp->role.invalid on it? If no one has, it's not zapped and
it will be found again in the hash table.

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