Re: [Xen-devel] [PATCH 2/2] xen: arm64: doc: Add some details about interrupt handling

[Julien Grall <julien.grall@xxxxxxx>]

Hello Dirk,

On 19/04/16 06:59, Dirk Behme wrote:
> In some mailing list discussion
>
> http://lists.xen.org/archives/html/xen-devel/2016-04/msg00214.html
>
> some details about the interrupt handling of Xen were given.
> Add that so it's not forgotten.
For your information, this is described on the wiki [1]. Although, not 
in the most obvious place.
I would prefer to see this kind of documentation on the wiki page under 
"Porting Xen on a new SOC".
> Signed-off-by: Dirk Behme <dirk.behme@xxxxxxxxxxxx>
> ---
> Note: I'd be happy to move this to an other documentation file if
>        any other file fits better.
>
>   docs/misc/arm/booting.txt | 15 +++++++++++++++
>   1 file changed, 15 insertions(+)
>
> diff --git a/docs/misc/arm/booting.txt b/docs/misc/arm/booting.txt
> index ffc9029..69b7d81 100644
> --- a/docs/misc/arm/booting.txt
> +++ b/docs/misc/arm/booting.txt
> @@ -27,6 +27,21 @@ On ARM64 Linux it has to be ensured that the Secure 
> Configuration
>   Register has the HVC instructions enabled at EL1 and above
>   (SCR_EL3.HCE == 1).
>
> +
> +Interrupt usage
> +===============
> +
> +All interrupts are taken by Xen. The function do_IRQ in Xen will
> +dispatch the IRQ either to a guest or call a Xen specific handler.
> +
> +Xen handles only a limited number of interrupt:
> +* timers
> +* UART
> +* SMMU
> +
> +The rest is either routed to guests or blacklisted by Xen.
> +
> +
>   [1] linux/Documentation/arm/Booting
>   Latest version: 
> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/arm/Booting
Regards,

[1] 
http://wiki.xenproject.org/wiki/Xen_ARM_with_Virtualization_Extensions_whitepaper
--
Julien Grall

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