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Re: [PATCH 07/15] xen/overlay: Enable device tree overlay assignment to running domains
- To: Henry Wang <xin.wang2@xxxxxxx>, Vikram Garhwal <fnu.vikram@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 24 Apr 2024 08:05:20 +0200
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Vikram Garhwal <vikram.garhwal@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 24 Apr 2024 06:05:27 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 24.04.2024 05:34, Henry Wang wrote:
> --- a/xen/include/public/sysctl.h
> +++ b/xen/include/public/sysctl.h
> @@ -1197,7 +1197,9 @@ struct xen_sysctl_dt_overlay {
> #define XEN_SYSCTL_DT_OVERLAY_ADD 1
> #define XEN_SYSCTL_DT_OVERLAY_REMOVE 2
> uint8_t overlay_op; /* IN: Add or remove. */
> - uint8_t pad[3]; /* IN: Must be zero. */
> + bool domain_mapping; /* IN: True of False. */
> + uint8_t pad[2]; /* IN: Must be zero. */
> + uint32_t domain_id;
> };
If you merely re-purposed padding fields, all would be fine without
bumping the interface version. Yet you don't, albeit for an unclear
reason: Why uint32_t rather than domid_t? And on top of that - why a
separate boolean when you could use e.g. DOMID_INVALID to indicate
"no domain mapping"?
That said - anything taking a domain ID is certainly suspicious in a
sysctl. Judging from the description you really mean this to be a
domctl. Anything else will require extra justification.
Jan
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