On 10.06.22 19:21, Anthony PERARD wrote:
Hello Anthony
On Tue, May 31, 2022 at 12:06:53AM +0300, Oleksandr Tyshchenko wrote:
From: Oleksandr Tyshchenko <[email protected]>
Reuse generic IOMMU device tree bindings to communicate Xen specific
information for the virtio devices for which the restricted memory
access using Xen grant mappings need to be enabled.
Insert "iommus" property pointed to the IOMMU node with "xen,grant-dma"
compatible to all virtio devices which backends are going to run in
non-hardware domains (which are non-trusted by default).
Based on device-tree binding from Linux:
Documentation/devicetree/bindings/iommu/xen,grant-dma.yaml
The example of generated nodes:
xen_iommu {
compatible = "xen,grant-dma";
#iommu-cells = <0x01>;
phandle = <0xfde9>;
};
virtio@2000000 {
compatible = "virtio,mmio";
reg = <0x00 0x2000000 0x00 0x200>;
interrupts = <0x00 0x01 0xf01>;
interrupt-parent = <0xfde8>;
dma-coherent;
iommus = <0xfde9 0x01>;
};
virtio@2000200 {
compatible = "virtio,mmio";
reg = <0x00 0x2000200 0x00 0x200>;
interrupts = <0x00 0x02 0xf01>;
interrupt-parent = <0xfde8>;
dma-coherent;
iommus = <0xfde9 0x01>;
};
Signed-off-by: Oleksandr Tyshchenko <[email protected]>
The patch looks fine.
---
!!! This patch is based on non upstreamed yet “Virtio support for toolstack
on Arm” V8 series which is on review now:
https://lore.kernel.org/xen-devel/[email protected]/
With the patch added to the series it depends on: Reviewed-by: Anthony PERARD
<[email protected]>
Thanks!
I will send V3 anyway (there is a comment from Julien here). But I will
send it together with the related series:
https://lore.kernel.org/xen-devel/[email protected]/
Thanks,
--
Regards,
Oleksandr Tyshchenko
