Re: [PATCH v7 06/20] x86/virt/tdx: Shut down TDX module in case of error

[Peter Zijlstra]

On Mon, Nov 21, 2022 at 01:26:28PM +1300, Kai Huang wrote:

> +/*
> + * Call the SEAMCALL on all online CPUs concurrently.  Caller to check
> + * @sc->err to determine whether any SEAMCALL failed on any cpu.
> + */
> +static void seamcall_on_each_cpu(struct seamcall_ctx *sc)
> +{
> +	on_each_cpu(seamcall_smp_call_function, sc, true);
> +}

Suppose the user has NOHZ_FULL configured, and is already running
userspace that will terminate on interrupt (this is desired feature for
NOHZ_FULL), guess how happy they'll be if someone, on another parition,
manages to tickle this TDX gunk?