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RE: [XEN PATCH v8 08/22] xen/arm: ffa: add support for FFA_ID_GET
- To: Jens Wiklander <jens.wiklander@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Henry Wang <Henry.Wang@xxxxxxx>
- Date: Thu, 13 Apr 2023 11:07:04 +0000
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- Thread-topic: [XEN PATCH v8 08/22] xen/arm: ffa: add support for FFA_ID_GET
Hi Jens,
> -----Original Message-----
> Subject: [XEN PATCH v8 08/22] xen/arm: ffa: add support for FFA_ID_GET
>
> Adds support for the FF-A function FFA_ID_GET to return the ID of the
> calling client.
>
> Signed-off-by: Jens Wiklander <jens.wiklander@xxxxxxxxxx>
> ---
> xen/arch/arm/tee/ffa.c | 21 +++++++++++++++++++++
> 1 file changed, 21 insertions(+)
>
> diff --git a/xen/arch/arm/tee/ffa.c b/xen/arch/arm/tee/ffa.c
> index 90ed71cbfda3..f129879c5b81 100644
> --- a/xen/arch/arm/tee/ffa.c
> +++ b/xen/arch/arm/tee/ffa.c
> @@ -181,6 +181,12 @@ static bool ffa_get_version(uint32_t *vers)
> return true;
> }
>
> +static uint16_t get_vm_id(const struct domain *d)
> +{
> + /* +1 since 0 is reserved for the hypervisor in FF-A */
> + return d->domain_id + 1;
Since here you want 0 to be reserved, I think maybe you can use
the "d->arch.p2m.vmid"? According to the logic in p2m_alloc_vmid(),
the "d->arch.p2m.vmid" is also a per-domain u16 value that starts
from 1.
Kind regards,
Henry
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