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Re: Domain IDs and Capabilities
- To: Jason Andryuk <jason.andryuk@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 2 Apr 2025 11:33:19 +0200
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- Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 02 Apr 2025 09:33:29 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 01.04.2025 19:32, Jason Andryuk wrote:
> On 2025-04-01 04:07, Jan Beulich wrote:
>> On 31.03.2025 23:46, Jason Andryuk wrote:
>>> It is useful for a domain to know its own domid. Xenstored has command
>>> line flags to set --master-domid (the local domid) and --priv-domid, but
>>> it would be better to autodetect those. Also, domids are necessary to
>>> set xenstore permissions - DOMID_SELF is not supported today.
>>
>> Setting permissions for oneself?
>
> Any call to xs_set_permissions(), AIUI. Say you have two domUs, dom1 &
> dom2. dom1 wants to create a shared xenstore node with full permissions
> for itself, but read-only permission for dom2. dom1 needs to know its
> own domid to set the permissions:
>
> * struct xs_permissions perms[2];
> *
> * perms[0].id = domid1;
> * perms[0].perms = XS_PERM_NONE;
> * perms[1].id = domid2;
> * perms[1].perms = XS_PERM_READ;
>
> perms[].id doesn't handle DOMID_SELF
That is, XS_SET_PERMS only ever fully replaces existing permissions, rather
than allowing incremental permit/revoke?
Jan
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