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From: Jorge Pereira <jorge.pereira@nxp.com>
To: "xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>
Subject: [Xen-devel] Having a DOM-U guest with 1:1 mapping in the second stage MMU.
Date: Tue, 14 Jan 2020 21:39:14 +0000	[thread overview]
Message-ID: <AM6PR04MB5094DE81655072BDA67F7922F0340@AM6PR04MB5094.eurprd04.prod.outlook.com> (raw)


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Hi Guys,

I'm currently using XEN in order to run side-by-side a DOM-0 with a DOM-U guest. My use-case scenario requires in the DOM-U direct access to some dma-capable devices such ethernet and some GPUs.

Since our target platform (i.MX8MM) does not support IOMMU, we can't assign dma-capable devices to the DOM-U guest because XEN does not create 1:1 mapping for that guest in the 2nd stage MMU. So, guest-virtual addresses are different than the physical ones.

Is it possible to have 1:1 mapping for DOM-U guests? If not, I'm interested to know what would be the estimated effort to support this feature?

Thanks in advance,

Cheers,
Jorge

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             reply	other threads:[~2020-01-14 21:40 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-14 21:39 Jorge Pereira [this message]
2020-01-15 11:07 ` [Xen-devel] Having a DOM-U guest with 1:1 mapping in the second stage MMU Julien Grall
2020-01-16 23:55   ` Stefano Stabellini
     [not found] <VI1PR04MB5807A7F83F1B2763BD7EEB20F91B0@VI1PR04MB5807.eurprd04.prod.outlook.com>
2020-02-12 13:45 ` Andrei Cherechesu
2020-02-12 21:36   ` Stefano Stabellini
2020-02-12 22:03     ` Julien Grall
2020-02-13 17:27 Andrei Cherechesu
2020-02-13 21:23 ` Julien Grall
2020-02-13 21:28 ` Stefano Stabellini
2020-04-01 10:14 Andrei Cherechesu
2020-04-01 16:26 ` Stefano Stabellini
2020-04-01 19:58 Andrei Cherechesu
2020-04-01 21:07 ` Julien Grall
2020-04-01 21:35 ` Stefano Stabellini

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