linux-kernel - Re: [PATCH v2 02/15] KVM: MMU: properly check last spte in fast_page

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Date:	Thu, 3 Oct 2013 14:16:49 +0800
From:	Xiao Guangrong <xiaoguangrong.eric@...il.com>
To:	Marcelo Tosatti <mtosatti@...hat.com>
Cc:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>, gleb@...hat.com,
	avi.kivity@...il.com, pbonzini@...hat.com,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH v2 02/15] KVM: MMU: properly check last spte in fast_page_fault()


On Oct 1, 2013, at 5:23 AM, Marcelo Tosatti <mtosatti@...hat.com> wrote:

>> 
> 
> Unrelated to this patch:
> 
> If vcpu->mode = OUTSIDE_GUEST_MODE, no IPI is sent
> by kvm_flush_remote_tlbs.

Yes.

> 
> So how is this supposed to work again?
> 
>        /*
>         * Wait for all vcpus to exit guest mode and/or lockless shadow
>         * page table walks.
>         */

On the lockless walking path, we change the vcpu->mode to
READING_SHADOW_PAGE_TABLES, so that IPI is needed.
Or i missed your question?


>        kvm_flush_remote_tlbs(kvm);
> 
> Patch looks fine.

Thank you, Marcelo!

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