Re: [Xen-devel] [PATCH v7 4/6] xen/arm: zynqmp: implement zynqmp_eemi

[Julien Grall <julien.grall@xxxxxxx>]

Hi,

On 12/17/18 10:10 PM, Stefano Stabellini wrote:
> +    /* These calls are safe and always allowed.  */
> +    case EEMI_FID(ZYNQMP_SIP_SVC_CALL_COUNT):
> +    case EEMI_FID(ZYNQMP_SIP_SVC_UID):
> +    case EEMI_FID(ZYNQMP_SIP_SVC_VERSION):
> +    case EEMI_FID(PM_GET_TRUSTZONE_VERSION):
> +    case EEMI_FID(PM_GET_API_VERSION):
Above you say the call to PM_GET_API_VERSION are safe and always 
allowed. But looking at the ATF implementation the first call to 
PM_GET_API_VERSION will enable IPI IRQ.
AFAICT, Dom0 will be the only domain to access IPI. So what happen if, 
in the Dom0less case, the guest is booting before and calling 
PM_GET_API_VERSION?
I haven't looked in depth the other SIP functions to see whether there 
are other potential issue.
Cheers,

--
Julien Grall

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