Re: [Xen-devel] [PATCH 1/3] [not-for-unstable] xen/arm: vgic-v3: Delay the initialization of the domain information

[Julien Grall <julien.grall@xxxxxxx>]

Hi,

On 09/04/2018 08:21 PM, Julien Grall wrote:
> A follow-up patch will require to know the number of vCPUs when
> initializating the vGICv3 domain structure. However this information is
> not available at domain creation. This is only known once
> XEN_DOMCTL_max_vpus is called for that domain.
>
> In order to get the max vCPUs around, delay the domain part of the vGIC
> v3 initialization until the first vCPU of the domain is initialized.
>
> Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
>
> ---
>
> Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>
> This is nasty but I can't find a better way for Xen 4.11 and older. This
> is not necessary for unstable as the number of vCPUs is known at domain
> creation.
>
> Andrew, I have CCed you to know whether you have a better idea where to
> place this call on Xen 4.11 and older.
I just noticed that d->max_vcpus is initialized after 
arch_domain_create. So without this patch on Xen 4.12, it will not work.
This is getting nastier because arch_domain_init is the one initialize 
the value returned by dom0_max_vcpus. So I am not entirely sure what to 
do here.
Cheers,

--
Julien Grall

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