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Re: [PATCH v4] xen/domain: unify domain ID allocation
- To: Julien Grall <julien@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 28 Apr 2025 11:08:51 +0200
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- Cc: andrew.cooper3@xxxxxxxxxx, anthony.perard@xxxxxxxxxx, michal.orzel@xxxxxxx, roger.pau@xxxxxxxxxx, sstabellini@xxxxxxxxxx, dmukhin@xxxxxxxx, dmkhn@xxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 28 Apr 2025 09:08:57 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 23.04.2025 13:22, Julien Grall wrote:
> On 22/04/2025 22:54, dmkhn@xxxxxxxxx wrote:
>> --- a/xen/common/domain.c
>> +++ b/xen/common/domain.c
>> @@ -66,6 +66,57 @@ DEFINE_RCU_READ_LOCK(domlist_read_lock);
>> static struct domain *domain_hash[DOMAIN_HASH_SIZE];
>> struct domain *domain_list;
>>
>> +/* Domain ID allocator */
>> +static unsigned int domid_last;
>> +
>> +static inline bool is_free_domid(domid_t dom)
>> +{
>> + struct domain *d = rcu_lock_domain_by_id(dom);
>> +
>> + if ( d )
>> + rcu_unlock_domain(d);
>> +
>> + return !d;
>> +}
>> +
>> +/*
>> + * Allocate new domain ID based on the hint.
>
> Maybe clarify this should not be used for system domains?
But those don't have their IDs allocated; they're pre-determined and outside
of the range available for allocation.
Jan
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