From: Keir Fraser <keir.xen@gmail.com>
To: Xinxin Jin <xinxinjin89@gmail.com>, Xen-devel@lists.xen.org
Subject: Re: No need to flush TLB in do_mmu_update ?
Date: Fri, 17 May 2013 06:17:33 +0100 [thread overview]
Message-ID: <CDBB7BFD.52FAA%keir.xen@gmail.com> (raw)
In-Reply-To: <CAJJWZcwuZzeykQK4hrAbny4kcakLPxL8pb6+=z884pR9Hd0dKA@mail.gmail.com>
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It is up to the guest to request the TLB flushes that it needs. Xen performs
the flushes it needs only for its own safety.
On 17/05/2013 00:57, "Xinxin Jin" <xinxinjin89@gmail.com> wrote:
> Hi, I read the code of the hypercall handler do_mmu_update(), which updates
> guests' page table. I thought after update it should flush the old mapping
> from relative TLB entry. However I didn't find any TLB flush operations in
> this function. Could anyone explain what is the reason behind ? Thanks a lot !
>
> Xinxin
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel
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prev parent reply other threads:[~2013-05-17 5:17 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-16 23:57 No need to flush TLB in do_mmu_update ? Xinxin Jin
2013-05-17 5:17 ` Keir Fraser [this message]
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