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Re: arm64: imx8: xen status
- To: Benjamin Mordaunt <crawford.benjamin15@xxxxxxxxx>
- From: Bertrand Marquis <Bertrand.Marquis@xxxxxxx>
- Date: Thu, 3 Nov 2022 12:34:48 +0000
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- Thread-topic: arm64: imx8: xen status
Hi Benjamin,
> On 3 Nov 2022, at 10:29, Benjamin Mordaunt <crawford.benjamin15@xxxxxxxxx>
> wrote:
>
> Hi all,
>
> I'm emailing to enquire about the status of Xen on iMX8 platforms, both for
> the standard and dom0less use-cases. I saw a previous thread
> (https://www.mail-archive.com/xen-devel@xxxxxxxxxxxxxxxxxxxx/msg62708.html),
> which seemed to suggest that there was work ongoing in 2019 to handle direct
> mapping in lieu of a lack of iommu/smmu on these platforms.
Direct mapping has been merged and can be used with dom0less now. It is only
available in conjunction with static allocation:
https://xenbits.xen.org/gitweb/?p=xen.git;a=blob;f=docs/misc/arm/passthrough-noiommu.txt;h=69b8de1975b32233522c0736b569a9587164ea1e;hb=refs/heads/staging
>
> Are these platforms generally well supported now or is there still work to be
> done?
I am not quite sure here as I do not use iMX8 boards, but at least you have a
solution to passthrough a device without an IOMMU.
Regards
Bertrand
>
> Kind regards,
>
> Ben
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