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SubjectRe: [PATCH v3 2/7] x86/sgx: Add infrastructure to identify SGX EPC pages
On Wed, Jul 28, 2021 at 03:19:46PM -0700, Dave Hansen wrote:
> On 7/28/21 1:46 PM, Tony Luck wrote:
> > Export a function sgx_is_epc_page() that simply reports whether an
> > address is an EPC page for use elsewhere in the kernel.
>
> It would be really nice to mention why this needs to be exported to
> modules. I assume it's the error injection driver or something that can
> be built as a module, but this export was a surprise when I saw it.
>
> It's probably also worth noting that this is a sloooooooow
> implementation compared to the core VM code that does something
> analogous: pfn_to_page(). It's fine for error handling, but we should
> probably have a comment to this effect so that more liberal use doesn't
> creep in anywhere.

You could also create an xarray to track physical EPC address ranges,
and make the query fast.

/Jarkko

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