[xen/arm]: Mapping physical memory to dom0/domU

[xen/arm]: Mapping physical memory to dom0/domU

[Lukas Jünger]

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Hi all,

Is there a way to map a region of physical memory to dom0/domU?
Let's say I have a custom device mapped at that memory region and I want 
either dom0 or a domU to have full access to this device.
There seems to be a way to share memory between dom0 and a domU, maybe 
also between domU and domU.

Thanks,
Lukas


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[Xen-devel] [xen/arm]: Mapping physical memory to dom0/domU

[Lukas Jünger]

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Hi all,

Is there a way to map a region of physical memory to dom0/domU?
Let's say I have a custom device mapped at that memory region and I want 
either dom0 or a domU to have full access to this device.
There seems to be a way to share memory between dom0 and a domU, maybe 
also between domU and domU.

Thanks,
Lukas


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Re: [xen/arm]: Mapping physical memory to dom0/domU

[Julien Grall]

On 29/05/2019 15:06, Lukas Jünger wrote:
> Hi all,

Hi,

> Is there a way to map a region of physical memory to dom0/domU?

Yes, you can use the option 'iomem'.

> Let's say I have a custom device mapped at that memory region and I want either 
> dom0 or a domU to have full access to this device.

The page [1] will give you instruction how to passthrough a device.

> There seems to be a way to share memory between dom0 and a domU, maybe also 
> between domU and domU.

This can be done dynamically using grant-table. There are patches on the ML for 
static sharing.

Cheers,

> 
> Thanks,
> Lukas

[1] https://xenbits.xen.org/docs/unstable/misc/arm/passthrough.txt

> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xenproject.org
> https://lists.xenproject.org/mailman/listinfo/xen-devel
> 

-- 
Julien Grall

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Re: [Xen-devel] [xen/arm]: Mapping physical memory to dom0/domU

[Julien Grall]

On 29/05/2019 15:06, Lukas Jünger wrote:
> Hi all,

Hi,

> Is there a way to map a region of physical memory to dom0/domU?

Yes, you can use the option 'iomem'.

> Let's say I have a custom device mapped at that memory region and I want either 
> dom0 or a domU to have full access to this device.

The page [1] will give you instruction how to passthrough a device.

> There seems to be a way to share memory between dom0 and a domU, maybe also 
> between domU and domU.

This can be done dynamically using grant-table. There are patches on the ML for 
static sharing.

Cheers,

> 
> Thanks,
> Lukas

[1] https://xenbits.xen.org/docs/unstable/misc/arm/passthrough.txt

> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xenproject.org
> https://lists.xenproject.org/mailman/listinfo/xen-devel
> 

-- 
Julien Grall

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