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Re: [RFC PATCH 3/4] x86/p2m-pt: Set p2m->need_flush if page was present before
- To: Teddy Astie <teddy.astie@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 27 Nov 2025 15:08:39 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 27 Nov 2025 14:08:46 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 27.11.2025 14:39, Teddy Astie wrote:
> Update p2m->need_flush if page was present before (requiring a tlb flush).
> This causes p2m->flush_tlb() to be now be reachable, make sure we call it
> only when set.
I don't follow. Why would p2m->flush_tlb() not have been reachable? There are
other places where ->need_flush is set to true.
> Signed-off-by: Teddy Astie <teddy.astie@xxxxxxxxxx>
> ---
> This change is important for the next patch.
> Would it be better to merge it with the next patch ?
I'm inclined to say yes, but without understanding the description here I
cannot be sure.
Hmm, wait. The sole place in x86 where the flag is set is in EPT code. So
do you perhaps mean that for NPT or shadow those call sites can now be
reached, and hence - with the hook being NULL there - checks need adding?
Then, by its title, the next patch actually may be making use of the hook,
so the checks then can be dropped again?
Jan
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