From mboxrd@z Thu Jan  1 00:00:00 1970
From: Julien Grall <julien.grall@linaro.org>
Subject: Re: [RFC PATCH v2 1/3] arch,
 arm: allow dom0 access to I/O memory of mapped devices
Date: Mon, 10 Mar 2014 11:30:54 +0000
Message-ID: <531DA26E.6040508@linaro.org>
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To: Arianna Avanzini <avanzini.arianna@gmail.com>
Cc: paolo.valente@unimore.it, stefano.stabellini@eu.citrix.com, dario.faggioli@citrix.com, Ian.Jackson@eu.citrix.com, xen-devel@lists.xen.org, Ian.Campbell@eu.citrix.com, etrudeau@broadcom.com, viktor.kleinik@globallogic.com
List-Id: xen-devel@lists.xenproject.org

Hello Arianna,

On 03/10/2014 08:25 AM, Arianna Avanzini wrote:
> Currently, dom0 is not allowed access to the I/O memory ranges
> used to access devices exposed to it. This commit attempts
> to give it access to those memory ranges during domain build
> by adding the ranges to dom0's iomem_caps.
> 
> Signed-off-by: Arianna Avanzini <avanzini.arianna@gmail.com>
> Cc: Dario Faggioli <dario.faggioli@citrix.com>
> Cc: Paolo Valente <paolo.valente@unimore.it>
> Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
> Cc: Julien Grall <julien.grall@citrix.com>
> Cc: Ian Campbell <Ian.Campbell@eu.citrix.com>
> Cc: Ian Jackson <Ian.Jackson@eu.citrix.com>
> Cc: Eric Trudeau <etrudeau@broadcom.com>
> Cc: Viktor Kleinik <viktor.kleinik@globallogic.com>
> ---
>  xen/arch/arm/domain_build.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
> index 5ca2f15..0b283d8 100644
> --- a/xen/arch/arm/domain_build.c
> +++ b/xen/arch/arm/domain_build.c
> @@ -11,6 +11,7 @@
>  #include <xen/device_tree.h>
>  #include <xen/libfdt/libfdt.h>
>  #include <xen/guest_access.h>
> +#include <xen/iocap.h>
>  #include <asm/setup.h>
>  #include <asm/platform.h>
>  #include <asm/psci.h>
> @@ -733,6 +734,15 @@ static int map_device(struct domain *d, const struct dt_device_node *dev)
>          DPRINT("addr %u = 0x%"PRIx64" - 0x%"PRIx64"\n",
>                 i, addr, addr + size - 1);
>  
> +        res = iomem_permit_access(d, paddr_to_pfn(addr & PAGE_MASK),
> +                                  paddr_to_pfn(PAGE_ALIGN(addr + size - 1)));
> +        if ( res )
> +        {
> +            printk(XENLOG_ERR "Unable to permit to dom0 access to"

Can you print the right domain id instead of using "dom0"?

I have a patch to remove the other hardcoded "dom0" in this function.

Regards,

-- 
Julien Grall