linux-kernel - Re: [PATCH 5/5] KVM: MMU: fast invalid all mmio sptes

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Date:	Sat, 16 Mar 2013 11:13:30 +0900
From:	Takuya Yoshikawa <takuya.yoshikawa@...il.com>
To:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
Cc:	Marcelo Tosatti <mtosatti@...hat.com>,
	Gleb Natapov <gleb@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH 5/5] KVM: MMU: fast invalid all mmio sptes

On Fri, 15 Mar 2013 23:29:53 +0800
Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com> wrote:

> +/*
> + * The caller should protect concurrent access on
> + * kvm->arch.mmio_invalid_gen. Currently, it is used by
> + * kvm_arch_commit_memory_region and protected by kvm->slots_lock.
> + */
> +void kvm_mmu_invalid_mmio_spte(struct kvm *kvm)

kvm_mmu_invalidate_mmio_sptes() may be a better name.

Thanks,
	Takuya

> +{
> +	/* Ensure update memslot has been completed. */
> +	smp_mb();
> +
> +	 trace_kvm_mmu_invalid_mmio_spte(kvm);
> +
> +	/*
> +	 * The very rare case: if the generation-number is round,
> +	 * zap all shadow pages.
> +	 */
> +	if (unlikely(kvm->arch.mmio_invalid_gen++ == MAX_GEN)) {
> +		kvm->arch.mmio_invalid_gen = 0;
> +		return kvm_mmu_zap_all(kvm);
> +	}
> +}
> +
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