Re: [PATCH v11 18/20] x86: Handle TDX erratum to reset TDX private memory during kexec() and reboot

[Dave Hansen]

On 6/12/23 03:27, Huang, Kai wrote:
> So I think a __mb() after setting tdmr->pamt_4k_base should be good enough, as
> it guarantees when setting to any pamt_*_size happens, the valid pamt_4k_base
> will be seen by other cpus.
> 
> Does it make sense?

Just use a normal old atomic_t or set_bit()/test_bit().  They have
built-in memory barriers are are less likely to get botched.