* No need to flush TLB in do_mmu_update ?
@ 2013-05-16 23:57 Xinxin Jin
2013-05-17 5:17 ` Keir Fraser
0 siblings, 1 reply; 2+ messages in thread
From: Xinxin Jin @ 2013-05-16 23:57 UTC (permalink / raw)
To: Xen-devel
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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
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* Re: No need to flush TLB in do_mmu_update ?
2013-05-16 23:57 No need to flush TLB in do_mmu_update ? Xinxin Jin
@ 2013-05-17 5:17 ` Keir Fraser
0 siblings, 0 replies; 2+ messages in thread
From: Keir Fraser @ 2013-05-17 5:17 UTC (permalink / raw)
To: Xinxin Jin, Xen-devel
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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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