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Re: [PATCH v4 1/6] xen/x86: Provide helpers for common code to access acpi_numa
- To: Wei Chen <wei.chen@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 8 Sep 2022 10:22:29 +0200
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- Cc: nd@xxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 08 Sep 2022 08:22:42 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 02.09.2022 05:31, Wei Chen wrote:
> acpi_numa is a specific NUMA switch for ACPI NUMA implementation.
> Other NUMA implementation may not need this switch. But this switch is
> not only used by ACPI code, it is also used directly in some general
> NUMA logic code. So far this hasn't caused any problem because Xen only
> has x86 implementing ACPI NUMA, but now Arm is implementing device tree
> based NUMA. Accesssing acpi_numa directly in some functions will be a
> block of reusing NUMA common code. It is also difficult for us to replace
> it with a new generic switch, because it is hard to prove that the new
> switch states can guarantee the original code will work correctly.
>
> So in this patch, we provide two helpers for common code to update and
> get states of acpi_numa. And other new NUMA implementations just need
> to provide the same helpers for common code. In this case, the generic
> NUMA logic code can be reused by all NUMA implementations.
>
> Signed-off-by: Wei Chen <wei.chen@xxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
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