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Re: [PATCH v3 04/18] xen/arm: flushtlb: Reduce scope of barrier for the TLB range flush
- To: Julien Grall <julien@xxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Michal Orzel <michal.orzel@xxxxxxx>
- Date: Tue, 13 Dec 2022 12:15:25 +0100
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- Cc: <Luca.Fancellu@xxxxxxx>, Julien Grall <jgrall@xxxxxxxxxx>, "Stefano Stabellini" <sstabellini@xxxxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Tue, 13 Dec 2022 11:15:46 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Hi Julien,
On 12/12/2022 10:55, Julien Grall wrote:
>
>
> From: Julien Grall <jgrall@xxxxxxxxxx>
>
> At the moment, flush_xen_tlb_range_va{,_local}() are using system
> wide memory barrier. This is quite expensive and unnecessary.
>
> For the local version, a non-shareable barrier is sufficient.
> For the SMP version, a inner-shareable barrier is sufficient.
s/a/an/
>
> Furthermore, the initial barrier only need to a store barrier.
s/need/needs/
>
> For the full explanation of the sequence see asm/arm{32,64}/flushtlb.h.
>
> Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>
Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx>
~Michal
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