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Re: [PATCH v2 07/17] xsm/dummy: Allow HVMOP_get_param for control domain
- To: Jason Andryuk <jason.andryuk@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 30 Jul 2025 17:21:29 +0200
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- Cc: "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 30 Jul 2025 15:21:41 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 16.07.2025 23:14, Jason Andryuk wrote:
> The Control domain is denied access to an untargetable domain. However
> init-dom0less wants to read the xenstore event channel HVM param to
> determine if xenstore should be set up.
>
> This is a read operation, so it is not modifying the domain. Special
> case the HVMOP_get_param operation for is_control_domain(). It is done
> in xsm_hvm_param() because xsm_default_action() is too complicated.
> HVMOP_get_param should be allowed for a domain itself (XSM_TARGET) and
> its device model - src->target or is_dm_domain(). It should otherwise
> be denied for untargetable domains. xsm_default_action() doesn't have
> sufficient information to identify the particular operation, so put it
> in xsm_hvm_param().
>
> Signed-off-by: Jason Andryuk <jason.andryuk@xxxxxxx>
> ---
> It's messy, but I couldn't think of a better way.
Fits well with my remarks on earlier patches. The granularity you want
simply can't be had this way, unless you use such undesirable "overrides".
Jan
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