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Re: [PATCH v5 3/9] IOMMU: add common API for device reserved memory
- To: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 25 Aug 2022 17:46:09 +0200
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- Cc: Paul Durrant <paul@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 25 Aug 2022 15:46:16 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 22.08.2022 17:27, Marek Marczykowski-Górecki wrote:
> Add API similar to rmrr= and ivmd= arguments, but in a common code. This
> will allow drivers to register reserved memory regardless of the IOMMU
> vendor.
> The direct reason for this API is xhci-dbc console driver (aka xue),
> that needs to use DMA. But future change may unify command line
> arguments for user-supplied reserved memory, and it may be useful for
> other drivers in the future too.
>
> This commit just introduces an API, subsequent patches will plug it in
> appropriate places. The reserved memory ranges needs to be saved
> locally, because at the point when they are collected, Xen doesn't know
> yet which IOMMU driver will be used.
>
> Signed-off-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
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