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Re: [PATCH 07/20] xen/arm: vIOMMU: Add cmdline boot option "viommu = <boolean>"
- To: Milan Djokic <milan_djokic@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 8 Aug 2025 08:20:57 +0200
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- Cc: Rahul Singh <rahul.singh@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Fri, 08 Aug 2025 06:21:04 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 07.08.2025 18:59, Milan Djokic wrote:
> --- a/docs/misc/xen-command-line.pandoc
> +++ b/docs/misc/xen-command-line.pandoc
> @@ -2058,6 +2058,13 @@ This option can be specified more than once (up to 8
> times at present).
>
> Flag to enable or disable support for PCI passthrough
>
> +### viommu (arm)
> +> `= <boolean>`
> +
> +> Default: `false`
> +
> +Flag to enable or disable support for Virtual IOMMU for guests.
Isn't this too coarse-grained? IOW don't you want to specify the kind of IOMMU
to use, even if right now only one is being implemented? Also - why on the
command line? Isn't this rather a per-guest setting?
> ### pcid (x86)
> > `= <boolean> | xpti=<bool>`
Also, seeing this adjacent entry, you're inserting in the wrong place. The
options are supposed to be alphabetically sorted.
Jan
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