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From: Julien Grall <julien@xen.org>
To: Penny Zheng <penny.zheng@arm.com>,
	xen-devel@lists.xenproject.org, sstabellini@kernel.org
Cc: Bertrand.Marquis@arm.com, Wei.Chen@arm.com
Subject: Re: [PATCH v6 03/11] xen/arm: Allow device-passthrough even the IOMMU is off
Date: Tue, 15 Feb 2022 20:26:59 +0000	[thread overview]
Message-ID: <1df77480-bb6b-4ac8-dfa2-f167bce51ffb@xen.org> (raw)
In-Reply-To: <20220214031956.3726764-4-penny.zheng@arm.com>

Hi,

On 14/02/2022 03:19, Penny Zheng wrote:
> From: Stefano Stabellini <sstabellini@kernel.org>
> 
> At the moment, we are only supporting device-passthrough when Xen has
> enabled the IOMMU. There are some use cases where it is not possible to
> use the IOMMU (e.g. doesn't exist, hardware limitation, performance) yet
> it would be OK to assign a device to trusted domain so long they are
> direct-mapped or the device doesn't do DMA.
> 
> Note that when the IOMMU is disabled, it will be necessary to add
> xen,force-assign-without-iommu for every device that needs to be assigned.
> 
> Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com>
> Signed-off-by: Penny Zheng <penny.zheng@arm.com>
> Tested-by: Stefano Stabellini <sstabellini@kernel.org>

Acked-by: Julien Grall <jgrall@amazon.com>

Cheers,

-- 
Julien Grall


  reply	other threads:[~2022-02-15 20:27 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-02-14  3:19 [PATCH v6 00/11] direct-map memory map Penny Zheng
2022-02-14  3:19 ` [PATCH v6 01/11] xen: introduce internal CDF_xxx flags for domain creation Penny Zheng
2022-02-14  3:19 ` [PATCH v6 02/11] xen: introduce CDF_directmap Penny Zheng
2022-02-15 20:26   ` Julien Grall
2022-02-16  9:34     ` Jan Beulich
2022-02-17 11:01       ` Julien Grall
2022-02-17 19:47         ` Julien Grall
2022-02-14  3:19 ` [PATCH v6 03/11] xen/arm: Allow device-passthrough even the IOMMU is off Penny Zheng
2022-02-15 20:26   ` Julien Grall [this message]
2022-02-14  3:19 ` [PATCH v6 04/11] xen/arm: introduce new helper parse_static_mem_prop and acquire_static_memory_bank Penny Zheng
2022-02-14  3:19 ` [PATCH v6 05/11] xen/arm: introduce direct-map for domUs Penny Zheng
2022-02-14  3:19 ` [PATCH v6 06/11] xen/arm: add ASSERT_UNREACHABLE in allocate_static_memory Penny Zheng
2022-02-14  3:19 ` [PATCH v6 07/11] xen/arm: if direct-map domain use native addresses for GICv2 Penny Zheng
2022-02-14  3:19 ` [PATCH v6 08/11] xen/arm: gate make_gicv3_domU_node with CONFIG_GICV3 Penny Zheng
2022-02-14  3:19 ` [PATCH v6 09/11] xen/arm: if direct-map domain use native addresses for GICv3 Penny Zheng
2022-02-14  3:19 ` [PATCH v6 10/11] xen/arm: if direct-map domain use native UART address and IRQ number for vPL011 Penny Zheng
2022-02-14  3:19 ` [PATCH v6 11/11] xen/docs: Document how to do passthrough without IOMMU Penny Zheng

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