Re: [PATCH v25 07/21] x86/sgx: Enumerate and track EPC sections

[Jarkko Sakkinen]

On Wed, Feb 05, 2020 at 11:57:00AM -0800, Sean Christopherson wrote:
> > +		ret = __eremove(sgx_epc_addr(page));
> > +		if (!WARN_ON_ONCE(ret)) {
> 
> Sadly, this WARN can fire after kexec() on systems with multiple EPC
> sections if the SECS has child pages in another section.

What causes this?

/Jarkko