linux-kernel - Re: [PATCH v2 0/2] iommu/vt-d: Use ida for domain ID management

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Message-ID: <2cc8a047-5453-44f1-839e-62425e1ca239@linux.intel.com>
Date: Mon, 12 May 2025 14:37:58 +0800
From: Baolu Lu <baolu.lu@...ux.intel.com>
To: Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
 Robin Murphy <robin.murphy@....com>, Jason Gunthorpe <jgg@...pe.ca>,
 Kevin Tian <kevin.tian@...el.com>
Cc: iommu@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/2] iommu/vt-d: Use ida for domain ID management

On 4/30/25 10:11, Lu Baolu wrote:
> This converts the Intel iommu driver's domain ID management from a
> fixed-size bitmap to the dynamic ida allocator. This improves memory
> efficiency by only allocating resources for the domain IDs actually in
> use, rather than the maximum possible number.
> 
> The also includes necessary cleanups after the ida conversion, including
> locking adjustment for the ida.
> 
> ---
> Change log:
> v2:
>   - Drop the last patch which simplified the code with __free(). There
>     needs a helper like xa_store_or_{reset,kfree}(). Thus I plan to put
>     it a separated series with broader reviewers.
> 
> v1:https://lore.kernel.org/linux-iommu/20250423031020.2189546-1- 
> baolu.lu@...ux.intel.com/
> 
> Lu Baolu (2):
>    iommu/vt-d: Use ida to manage domain id
>    iommu/vt-d: Replace spin_lock with mutex to protect domain ida

Queued for v6.16-rc1.